Turbellarians name details
Dalyellia hallezii (Graff, 1882) Graff, 1905
485441 (urn:lsid:marinespecies.org:taxname:485441)
uncertain > nomen dubium (See explanation in the taxonomical note.)
Species
Dalyellia hallezi Hofsten, 1907 · unaccepted (Wrong spelling of epithet by...)
Wrong spelling of epithet by Hofsten (1907: p. 537) and several other authors (e.g. Gieysztor)
Microdalyellia halezii (Graff, 1882) Ruebush & Hayes, 1939 · unaccepted (The species was already...)
The species was already considered a species dubium as Dalyellia hallezii (see the Taxonomic Remark under that combination)
Vortex hallezii Graff, 1882 · unaccepted
- Subspecies Dalyellia hallezii borealis Eggers, 1924 accepted as Microdalyellia rossi (Graff, 1911) Gieysztor, 1938
recent only
(of Vortex hallezii Graff, 1882) Graff, L., von. (1882). Monographie der Turbellarien 1. Rhabdocoelida. <em>[Book].</em> 1-442, Verlag Wilhelm Engelmann, Leipzig., available online at https://books.google.com/books/about/Monographie_der_Turbellarien.html?id=LT0hAQAAMAAJ
page(s): 355–356 [details]
page(s): 355–356 [details]
Taxonomy The name has a complicated history. It was first coined by Graff (1882) as Vortex hallezii for some specimens wrongly...
Taxonomy The name has a complicated history. It was first coined by Graff (1882) as Vortex hallezii for some specimens wrongly identified as Vortex pictus by Hallez (1878) (see notes on Vortex hallezii). Hofsten (1907), with great doubt, puts some specimens he collected in Switzerland in D. hallezi (mind the epithet is spelled wrongly); he expresses his doubts by mentioning "Dalyellia sp. AN hallezi". Later Hofsten (1911) describes a new species based on these specimens: D. brevispina Hofsten, 1911. In 1921, Beklemischev considers the description of Graff too inadequate to allow identification, and considers it a nomen dubium, synonymising it provisionally with the new species D. karisalmica Beklemischev 1921 (p. 648–649 translated: " In 1917, I gave an image of the copulatory organ of this species (Fig. 7), conventionally designated as D. hallezii (Gr.). In the same year, N.V. Nasonov described it as D. karisalmica n. sp. I have now come to the conclusion that Vortex hallezii Gr., due to the insufficiency of Graff's description, cannot really be identified, and therefore the name D. karisalmica Nas remains the species studied here." )
In 1924, Nasonov considers D. brevimana Beklemischev, 1921 a synonym of D. hallezii, a view he continues to express in several papers (see Sources list). Gieysztor (1926) considers D. hallezii insufficiently described, and calls it a nomen nudum, which is impossible, as it is described. He refers to a "nomen dubium" or nomen oblitum", which Gieysztor himself explicitly mentions in a footnote on p. 242 in his article of 1938 (Hiermit korrigiere ich den von mir nicht richtig anngewandten Ausdruck (1926) in Bezug auf M. hallezi: "nomen nudum", der durch den Ausdruck "species dubia" ersetzt werden muss). In 1929 (p. 165) Gieysztor considers all following species as synonyms of D. rossi: D hallezii, D. karisalmica, and D. hallezii var. borealis). In his 1938 article (p. 241) Gieysztor again argues quite intensively to consider the species a "nomen dubium" as it has lead to much confusion with several other species (D. brevimana, D. rossi, D. picta) and explicitely argues against future use of the name, because of the complex and confusing application, and the fact that it was inadequetely described. This view seems to be followed by most authors since then, and the name does not appear in literature anymore. Luther mentions it as synonym of both D. brevimana and D. rossi illustrating the complexity of the taxonomical history.
We follow Gieysztor's suggestion, and consider it as a nomen dubium/oblitum, although Ruebush & Hayes mention it as a species of Microdalyellia. [details]
In 1924, Nasonov considers D. brevimana Beklemischev, 1921 a synonym of D. hallezii, a view he continues to express in several papers (see Sources list). Gieysztor (1926) considers D. hallezii insufficiently described, and calls it a nomen nudum, which is impossible, as it is described. He refers to a "nomen dubium" or nomen oblitum", which Gieysztor himself explicitly mentions in a footnote on p. 242 in his article of 1938 (Hiermit korrigiere ich den von mir nicht richtig anngewandten Ausdruck (1926) in Bezug auf M. hallezi: "nomen nudum", der durch den Ausdruck "species dubia" ersetzt werden muss). In 1929 (p. 165) Gieysztor considers all following species as synonyms of D. rossi: D hallezii, D. karisalmica, and D. hallezii var. borealis). In his 1938 article (p. 241) Gieysztor again argues quite intensively to consider the species a "nomen dubium" as it has lead to much confusion with several other species (D. brevimana, D. rossi, D. picta) and explicitely argues against future use of the name, because of the complex and confusing application, and the fact that it was inadequetely described. This view seems to be followed by most authors since then, and the name does not appear in literature anymore. Luther mentions it as synonym of both D. brevimana and D. rossi illustrating the complexity of the taxonomical history.
We follow Gieysztor's suggestion, and consider it as a nomen dubium/oblitum, although Ruebush & Hayes mention it as a species of Microdalyellia. [details]
Tyler, S., Artois, T.; Schilling, S.; Hooge, M.; Bush, L.F. (eds) (2006-2024). World List of turbellarian worms: Acoelomorpha, Catenulida, Rhabditophora. Dalyellia hallezii (Graff, 1882) Graff, 1905. Accessed at: https://www.marinespecies.org/turbellarians/aphia.php?p=taxdetails&id=485441 on 2026-01-08
Date
action
by
original description
(of Vortex hallezii Graff, 1882) Graff, L., von. (1882). Monographie der Turbellarien 1. Rhabdocoelida. <em>[Book].</em> 1-442, Verlag Wilhelm Engelmann, Leipzig., available online at https://books.google.com/books/about/Monographie_der_Turbellarien.html?id=LT0hAQAAMAAJ
page(s): 355–356 [details]
taxonomy source Hofsten, N. von. (1912). Zur Kenntnis der Tiefenfauna des Brienzer und des Thuner Sees. [On the knowledge of the deep-water fauna of Lake Brienz and Lake Thun.]. <em>Archiv für Hydrobiologie.</em> 7:1-62, 163-229, figs. 1-2, tab. 1. (5-xii-1911; 13-ii-1912).
page(s): 30–31; note: It is only with great doubt that Hofsten (1907) identifies his specimens as D. hallezii. He, therefore mentions them as Dalyellia sp. AN hallezi (Graff) (Mind the wrong spelling of the epithet, which ...
[details]
taxonomy source Beklemischev, V. N. (1921). Materiaux concernant la systematique et la faunistique des Turbellaria de la Russie de l'Est. (Materialen zur Systematik und Faunistik der Turbellarien Ost-Ruslands). <em>Bulletin de l'Academie de Sciences de Russie.</em> 6(15): 631–656. Fig 1-3.
page(s): 648; note: Considers D. hallezii synonymous with D. karisalmica (see Note) [details]
taxonomy source Beklemischev, V. N. (1917). Turbellariés collectionnés dans le gouvernement de Kalouga en eté 1915. [In Russian]. Annuaire Musée Zoologique Acad. Sc. (Petrograd), 21: 347-372
page(s): 355–357 [details]
taxonomy source Nasonov, N. V. (1924). Les traits généraux de la distribution géographique des Turbellaria rhabdocoelida dans la Russie d'Europe. <em>Bulletin de l'Académie des Sciences de Russie.Série 4.</em> 18 (12–18): 327–352. 1 Map.
page(s): 332–333; note: Synonymises D. brevimana Beklemischev, 1921 with D. hallezii, a view not followed in later literature. [details] Available for editors
additional source Gilbert, C. M. (1935). A comparative study of three new American species of the genus Phaenocora with special reference to their reproductive organs and their relationships with other described forms of the genus. <em>Acta Zoologica.</em> 16: 283–386.
page(s): 351 [details] Available for editors
additional source Beauchamp, P. de. (1927). Jensenia oculifera, n. sp., Turbellarié rhabdocoele marin. <em>Bulletin de la Société Zoologique de France.</em> 52:122-126.
page(s): 126; note: Epithet spelled wrongly: "D. hallezi" [details] Available for editors
additional source Nasonov, N. V. (1924). La faune des Turbellaria du gouvernement de Petrograd. <em>Comptes Rendus de l'Académie des Sciences de Russie.</em> 12–15.
page(s): 13; note: Synonymises D. brevimana Beklemischev, 1921 with D. hallezii, a view not followed in later literature. [details] Available for editors
additional source Fulinski, B. (1915). Materyaly do fauny wirków (Turbellaria) ziem Polskich 1. Niektóre wirki z okolic Lwowa, Gródka i innych miejscowosci. <em>Rozprawy i Wiadomosci z Muzeum im. Dzieduszyckich.</em> 1(3-4): 159–175.
page(s): 165 [details]
additional source Graff, L. von. (1913). Turbellaria II. Rhabdocoelida. [Das Tierreich, Eine Zusammenstellung und Kennzeichnung der rezenten Tierformen Heft 35/1913]. Berlin, Verlag von R. Friedländer und Sohn, Ausgegeben im Juni 1913., 484 pages. [reprinted 1966, Verlag Von J. Cramer W], available online at https://www.biodiversitylibrary.org/page/883047
page(s): 3, 8, 87, 92–93, 105, 113–114, 119 [details]
additional source Graff, L. von. (1909). IV. Turbellaria, Strudelwürmer. I. Teil : Allgemeines und Rhabdocoelida. <em>Brauer Suesswasserfauna Deutschlands H.</em> 19: 59-142.
page(s): 88 [details]
additional source Hofsten, N. v. (1907). Studien über Turbellarien aus dem Berner Oberland. <em>Zeitschrift für wissenschaftliche Zoologie.</em> 85: 391-654. With 5 plates (22–26).
page(s): 537–538; note: It is only with great doubt that Hofsten identifies his specimens as D. hallezii. He therefore refers to it as D. sp. an hallezi (Graff) (notice the epithet was spelled wrong). Later, Hofsten (1911: p...
[details]
additional source Graff, L. von. (1904-08). I. Abtheilung; Acoela und Rhabdocoela. <em>In: Bronn's Klassen und Ordnungen des Tierreichs, vol. 4. Vermes. Abtheilung I.c: Turbellaria.</em> C. F. Winter'sche Verlagshandlung, Leipzig. pp. I–XXII; 1733-2599.
page(s): 2054, 2068, 2121, 2218, 2566 [details]
additional source Nasonov, N. V. (1926). Die Turbellarienfauna des Leningrader Gouvernements. I. Hysterophora, Graffilidae und Dalyellidae. <em>Bulletin de l'Académie des Sciences de l'URSS Ser.4.</em> 20(9): 817-836.
page(s): 826–829; note: Synonymises D. brevimana Beklemischev, 1921 with D. hallezii, a view not followed in later literature. Also expresses the difficulti of distinguishing D. hallezii from D. picta, a concern he expresses...
[details] Available for editors
new combination reference Graff, L. von. (1905). Marine Turbellarien Orottavas und der Küsten Europas. <em>Zeitschrift fur wissenschaftlige Zoologie.</em> 83: 68-150. With 6 plates., available online at https://www.biodiversitylibrary.org/page/43242488
page(s): 102 [details]
status source Gieysztor, M. (1938). Systematisch-anatomische Untersuchungen an Turbellarien Polens. <em>Zoologica Poloniae.</em> 3: 215–248. With 3 plates.
page(s): 241–245; note: See Taxonomy Note [details] Available for editors
status source Gieysztor, M. (1926). Über die Rhabdocoelidenfauna aus der Umgebung von Warschau. <em>Extrait du Bulletin de l'Academie Polonaise des Sciences et des Lettres. Classe des Sciences Mathématiques et Naturelles - Série B: Sciences Naturelles.</em> 617–671, t. 17-19.
page(s): 636–640, 666; note: See Note. [details] Available for editors
status source Gieysztor, M. (1929). Zur Kenntnis einiger Dalyellia-, Castradella- und Castrada-Arten. <em>Bulletin International de l'Académie Polonaise des Sciences et des Lettres. Classe des Sciences Mathématiques et Naturelles.</em> Série B: Sciences Naturelles (II) (3/6): 155–195. Plates 8–10.
page(s): 165 [details] Available for editors
status source Gieysztor, M. (1939). Übersicht der Rhabdocoelen und Alloeocoelen Polens. <em>Archives d'Hydrobiologie et d'lchtyologie.</em> 12: 1–54.
page(s): 29 [details] Available for editors
additional source (of Vortex hallezii Graff, 1882) Sabussow, H. (1900). Beobachtungen über die Turbellarien der Inseln von Salowetzk. <em>Trudy Obshchestva yestestvoispytateley pri Imperatorskom Kazanskom universitete (= Proceedings of the Society of Naturalists at the Imperial Kazan University).</em> 34(4): 1–208. 3 plates.
page(s): 37, 188; note: Mentions Vortex sp., which according to Graff (1913: p. 113) could refer to Vortex hallezii. [details]
additional source (of Vortex hallezii Graff, 1882) Braun, M. (1885). Die Rhabdocoeliden Turbellarien Livlands. <em>Archiv für die Naturkunde Liv-, Ehst-, und Kurlands.</em> Ser 2. 10 (2): 131–251. Plates 1–4.
page(s): 218–219 [details]
additional source (of Vortex hallezii Graff, 1882) Dorner, G. (1902). Darstellung der Turbellarienfauna der Binnengewässer Ostpreussens. <em>Schriften der physikalisch-ökonomischen Gesellschaft zu Königsberg in Pr.</em> 43: 1-58. Taf. 1-2.
page(s): 36; note: Epithet wrongly spelled as "hallezi". [details]
additional source (of Vortex hallezii Graff, 1882) Fuhrmann, O. (1900). Note sur les Turbellariés des environs de Genève. <em>Revue Suisse de Zoologie.</em> 7: 717-731, Plate 23.
page(s): 727; note: Mentions that, according to Vejdovsky V. hallezii is identical to Vortex pictus [details]
additional source (of Vortex hallezii Graff, 1882) Markow, M. (1904). Essai sur la faune des Turbellaries dans les gouvernements de Kharkow et de Poltawa. [In Russian] Travaux de la Societe des naturalistes a l'Universite Imperiale de Kharkow. Travaux Soc naturall Univ Imper Kharkow, 39:1-79 (Russian with French).
page(s): 51 [details]
additional source (of Vortex hallezii Graff, 1882) Hallez, P. (1890). Catalogue des Turbellaries (Rhabdocoelides et Dendrocoelides) du Nord de la France & de la Cote Boulonnaise. <em>Revue Biologique du Nord de la France.</em> 2: 160–165; 200–206; 227–234; 312–319; 393–402.
page(s): 317–318; note: Mentions that he (Hallez, 1879) misidentified this species wrongly as V. pictus Schmidt (1848), which was already recognised by Graff (1882), who, therefore, described a new species (V. hallezii) [details]
additional source (of Vortex hallezii Graff, 1882) Sekera, E. (1889). Prispevsky ku zuamostem o Turbellaruch sladkovoduich. [In Slovakian?; German resume]. <em>Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Klasse.</em> 27: 304–348.
page(s): 334 [details]
additional source (of Vortex hallezii Graff, 1882) Markow, M. (1903). Zur Turbellarienfauna der Umgebung von Charkow (Südrussland). <em>Zoologischer Anzeiger.</em> 26: 221-223.
page(s): 223; note: Epithet wrongly spelled as "halezii" [details]
additional source (of Vortex hallezii Graff, 1882) Hallez, P. (1894). Catalogue des Rhabdocoelides, Triclades & Polyclades du Nord de la France. 2e Édition. Imprimerie L. Danel. Lille. 239 pp, 2 plates.
page(s): 93, 94–95 [details]
additional source (of Vortex hallezii Graff, 1882) Vejdovsky, F. (1895). Zur vergleichenden Anatomie der Turbellarien (Zugleiche ein Beitrag zur Turbellarienfauna Bohemens.) I Über die Gattung Opistoma O. Schm. II. Der Geschlechtsapparat der Derostomeen. III. Über zwei Vortex-Arten mit Berücksichtigung deren Geschlechtsorgane. IV. Über die Prorhynchiden Böhmens. V. Zur Kenntnis der Macrostomiden. <em>Zeitschrift für wissenschaftliche Zoologie.</em> 60 (1): 90–163. With 4 plates.
page(s): 135 [details]
new combination reference (of Microdalyellia halezii (Graff, 1882) Ruebush & Hayes, 1939) Ruebush, T. K.; Hayes, W. J. Jr. (1939). The genus Dalyellia in America II. <em>Zoologischer Anzeiger.</em> 128: 136-152.
page(s): 148 [details] Available for editors
page(s): 355–356 [details]
taxonomy source Hofsten, N. von. (1912). Zur Kenntnis der Tiefenfauna des Brienzer und des Thuner Sees. [On the knowledge of the deep-water fauna of Lake Brienz and Lake Thun.]. <em>Archiv für Hydrobiologie.</em> 7:1-62, 163-229, figs. 1-2, tab. 1. (5-xii-1911; 13-ii-1912).
page(s): 30–31; note: It is only with great doubt that Hofsten (1907) identifies his specimens as D. hallezii. He, therefore mentions them as Dalyellia sp. AN hallezi (Graff) (Mind the wrong spelling of the epithet, which ...
It is only with great doubt that Hofsten (1907) identifies his specimens as D. hallezii. He, therefore mentions them as Dalyellia sp. AN hallezi (Graff) (Mind the wrong spelling of the epithet, which should be hallezii). Later, he (Hofsten, 1911) describes a new species for these specimens: D. brevispina Hofsten, 1911.
taxonomy source Beklemischev, V. N. (1921). Materiaux concernant la systematique et la faunistique des Turbellaria de la Russie de l'Est. (Materialen zur Systematik und Faunistik der Turbellarien Ost-Ruslands). <em>Bulletin de l'Academie de Sciences de Russie.</em> 6(15): 631–656. Fig 1-3.
page(s): 648; note: Considers D. hallezii synonymous with D. karisalmica (see Note) [details]
taxonomy source Beklemischev, V. N. (1917). Turbellariés collectionnés dans le gouvernement de Kalouga en eté 1915. [In Russian]. Annuaire Musée Zoologique Acad. Sc. (Petrograd), 21: 347-372
page(s): 355–357 [details]
taxonomy source Nasonov, N. V. (1924). Les traits généraux de la distribution géographique des Turbellaria rhabdocoelida dans la Russie d'Europe. <em>Bulletin de l'Académie des Sciences de Russie.Série 4.</em> 18 (12–18): 327–352. 1 Map.
page(s): 332–333; note: Synonymises D. brevimana Beklemischev, 1921 with D. hallezii, a view not followed in later literature. [details] Available for editors
additional source Gilbert, C. M. (1935). A comparative study of three new American species of the genus Phaenocora with special reference to their reproductive organs and their relationships with other described forms of the genus. <em>Acta Zoologica.</em> 16: 283–386.
page(s): 351 [details] Available for editors
additional source Beauchamp, P. de. (1927). Jensenia oculifera, n. sp., Turbellarié rhabdocoele marin. <em>Bulletin de la Société Zoologique de France.</em> 52:122-126.
page(s): 126; note: Epithet spelled wrongly: "D. hallezi" [details] Available for editors
additional source Nasonov, N. V. (1924). La faune des Turbellaria du gouvernement de Petrograd. <em>Comptes Rendus de l'Académie des Sciences de Russie.</em> 12–15.
page(s): 13; note: Synonymises D. brevimana Beklemischev, 1921 with D. hallezii, a view not followed in later literature. [details] Available for editors
additional source Fulinski, B. (1915). Materyaly do fauny wirków (Turbellaria) ziem Polskich 1. Niektóre wirki z okolic Lwowa, Gródka i innych miejscowosci. <em>Rozprawy i Wiadomosci z Muzeum im. Dzieduszyckich.</em> 1(3-4): 159–175.
page(s): 165 [details]
additional source Graff, L. von. (1913). Turbellaria II. Rhabdocoelida. [Das Tierreich, Eine Zusammenstellung und Kennzeichnung der rezenten Tierformen Heft 35/1913]. Berlin, Verlag von R. Friedländer und Sohn, Ausgegeben im Juni 1913., 484 pages. [reprinted 1966, Verlag Von J. Cramer W], available online at https://www.biodiversitylibrary.org/page/883047
page(s): 3, 8, 87, 92–93, 105, 113–114, 119 [details]
additional source Graff, L. von. (1909). IV. Turbellaria, Strudelwürmer. I. Teil : Allgemeines und Rhabdocoelida. <em>Brauer Suesswasserfauna Deutschlands H.</em> 19: 59-142.
page(s): 88 [details]
additional source Hofsten, N. v. (1907). Studien über Turbellarien aus dem Berner Oberland. <em>Zeitschrift für wissenschaftliche Zoologie.</em> 85: 391-654. With 5 plates (22–26).
page(s): 537–538; note: It is only with great doubt that Hofsten identifies his specimens as D. hallezii. He therefore refers to it as D. sp. an hallezi (Graff) (notice the epithet was spelled wrong). Later, Hofsten (1911: p...
It is only with great doubt that Hofsten identifies his specimens as D. hallezii. He therefore refers to it as D. sp. an hallezi (Graff) (notice the epithet was spelled wrong). Later, Hofsten (1911: p. 30–31) himself describes a new species for these specimens: D. brevispina Hofsten, 1911.
additional source Graff, L. von. (1904-08). I. Abtheilung; Acoela und Rhabdocoela. <em>In: Bronn's Klassen und Ordnungen des Tierreichs, vol. 4. Vermes. Abtheilung I.c: Turbellaria.</em> C. F. Winter'sche Verlagshandlung, Leipzig. pp. I–XXII; 1733-2599.
page(s): 2054, 2068, 2121, 2218, 2566 [details]
additional source Nasonov, N. V. (1926). Die Turbellarienfauna des Leningrader Gouvernements. I. Hysterophora, Graffilidae und Dalyellidae. <em>Bulletin de l'Académie des Sciences de l'URSS Ser.4.</em> 20(9): 817-836.
page(s): 826–829; note: Synonymises D. brevimana Beklemischev, 1921 with D. hallezii, a view not followed in later literature. Also expresses the difficulti of distinguishing D. hallezii from D. picta, a concern he expresses...
Synonymises D. brevimana Beklemischev, 1921 with D. hallezii, a view not followed in later literature. Also expresses the difficulti of distinguishing D. hallezii from D. picta, a concern he expresses in several articles.
new combination reference Graff, L. von. (1905). Marine Turbellarien Orottavas und der Küsten Europas. <em>Zeitschrift fur wissenschaftlige Zoologie.</em> 83: 68-150. With 6 plates., available online at https://www.biodiversitylibrary.org/page/43242488
page(s): 102 [details]
status source Gieysztor, M. (1938). Systematisch-anatomische Untersuchungen an Turbellarien Polens. <em>Zoologica Poloniae.</em> 3: 215–248. With 3 plates.
page(s): 241–245; note: See Taxonomy Note [details] Available for editors
status source Gieysztor, M. (1926). Über die Rhabdocoelidenfauna aus der Umgebung von Warschau. <em>Extrait du Bulletin de l'Academie Polonaise des Sciences et des Lettres. Classe des Sciences Mathématiques et Naturelles - Série B: Sciences Naturelles.</em> 617–671, t. 17-19.
page(s): 636–640, 666; note: See Note. [details] Available for editors
status source Gieysztor, M. (1929). Zur Kenntnis einiger Dalyellia-, Castradella- und Castrada-Arten. <em>Bulletin International de l'Académie Polonaise des Sciences et des Lettres. Classe des Sciences Mathématiques et Naturelles.</em> Série B: Sciences Naturelles (II) (3/6): 155–195. Plates 8–10.
page(s): 165 [details] Available for editors
status source Gieysztor, M. (1939). Übersicht der Rhabdocoelen und Alloeocoelen Polens. <em>Archives d'Hydrobiologie et d'lchtyologie.</em> 12: 1–54.
page(s): 29 [details] Available for editors
additional source (of Vortex hallezii Graff, 1882) Sabussow, H. (1900). Beobachtungen über die Turbellarien der Inseln von Salowetzk. <em>Trudy Obshchestva yestestvoispytateley pri Imperatorskom Kazanskom universitete (= Proceedings of the Society of Naturalists at the Imperial Kazan University).</em> 34(4): 1–208. 3 plates.
page(s): 37, 188; note: Mentions Vortex sp., which according to Graff (1913: p. 113) could refer to Vortex hallezii. [details]
additional source (of Vortex hallezii Graff, 1882) Braun, M. (1885). Die Rhabdocoeliden Turbellarien Livlands. <em>Archiv für die Naturkunde Liv-, Ehst-, und Kurlands.</em> Ser 2. 10 (2): 131–251. Plates 1–4.
page(s): 218–219 [details]
additional source (of Vortex hallezii Graff, 1882) Dorner, G. (1902). Darstellung der Turbellarienfauna der Binnengewässer Ostpreussens. <em>Schriften der physikalisch-ökonomischen Gesellschaft zu Königsberg in Pr.</em> 43: 1-58. Taf. 1-2.
page(s): 36; note: Epithet wrongly spelled as "hallezi". [details]
additional source (of Vortex hallezii Graff, 1882) Fuhrmann, O. (1900). Note sur les Turbellariés des environs de Genève. <em>Revue Suisse de Zoologie.</em> 7: 717-731, Plate 23.
page(s): 727; note: Mentions that, according to Vejdovsky V. hallezii is identical to Vortex pictus [details]
additional source (of Vortex hallezii Graff, 1882) Markow, M. (1904). Essai sur la faune des Turbellaries dans les gouvernements de Kharkow et de Poltawa. [In Russian] Travaux de la Societe des naturalistes a l'Universite Imperiale de Kharkow. Travaux Soc naturall Univ Imper Kharkow, 39:1-79 (Russian with French).
page(s): 51 [details]
additional source (of Vortex hallezii Graff, 1882) Hallez, P. (1890). Catalogue des Turbellaries (Rhabdocoelides et Dendrocoelides) du Nord de la France & de la Cote Boulonnaise. <em>Revue Biologique du Nord de la France.</em> 2: 160–165; 200–206; 227–234; 312–319; 393–402.
page(s): 317–318; note: Mentions that he (Hallez, 1879) misidentified this species wrongly as V. pictus Schmidt (1848), which was already recognised by Graff (1882), who, therefore, described a new species (V. hallezii) [details]
additional source (of Vortex hallezii Graff, 1882) Sekera, E. (1889). Prispevsky ku zuamostem o Turbellaruch sladkovoduich. [In Slovakian?; German resume]. <em>Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Klasse.</em> 27: 304–348.
page(s): 334 [details]
additional source (of Vortex hallezii Graff, 1882) Markow, M. (1903). Zur Turbellarienfauna der Umgebung von Charkow (Südrussland). <em>Zoologischer Anzeiger.</em> 26: 221-223.
page(s): 223; note: Epithet wrongly spelled as "halezii" [details]
additional source (of Vortex hallezii Graff, 1882) Hallez, P. (1894). Catalogue des Rhabdocoelides, Triclades & Polyclades du Nord de la France. 2e Édition. Imprimerie L. Danel. Lille. 239 pp, 2 plates.
page(s): 93, 94–95 [details]
additional source (of Vortex hallezii Graff, 1882) Vejdovsky, F. (1895). Zur vergleichenden Anatomie der Turbellarien (Zugleiche ein Beitrag zur Turbellarienfauna Bohemens.) I Über die Gattung Opistoma O. Schm. II. Der Geschlechtsapparat der Derostomeen. III. Über zwei Vortex-Arten mit Berücksichtigung deren Geschlechtsorgane. IV. Über die Prorhynchiden Böhmens. V. Zur Kenntnis der Macrostomiden. <em>Zeitschrift für wissenschaftliche Zoologie.</em> 60 (1): 90–163. With 4 plates.
page(s): 135 [details]
new combination reference (of Microdalyellia halezii (Graff, 1882) Ruebush & Hayes, 1939) Ruebush, T. K.; Hayes, W. J. Jr. (1939). The genus Dalyellia in America II. <em>Zoologischer Anzeiger.</em> 128: 136-152.
page(s): 148 [details] Available for editors
Present Inaccurate Introduced: alien Containing type locality
From editor or global species database
Taxonomy The name has a complicated history. It was first coined by Graff (1882) as Vortex hallezii for some specimens wrongly identified as Vortex pictus by Hallez (1878) (see notes on Vortex hallezii). Hofsten (1907), with great doubt, puts some specimens he collected in Switzerland in D. hallezi (mind the epithet is spelled wrongly); he expresses his doubts by mentioning "Dalyellia sp. AN hallezi". Later Hofsten (1911) describes a new species based on these specimens: D. brevispina Hofsten, 1911. In 1921, Beklemischev considers the description of Graff too inadequate to allow identification, and considers it a nomen dubium, synonymising it provisionally with the new species D. karisalmica Beklemischev 1921 (p. 648–649 translated: " In 1917, I gave an image of the copulatory organ of this species (Fig. 7), conventionally designated as D. hallezii (Gr.). In the same year, N.V. Nasonov described it as D. karisalmica n. sp. I have now come to the conclusion that Vortex hallezii Gr., due to the insufficiency of Graff's description, cannot really be identified, and therefore the name D. karisalmica Nas remains the species studied here." )In 1924, Nasonov considers D. brevimana Beklemischev, 1921 a synonym of D. hallezii, a view he continues to express in several papers (see Sources list). Gieysztor (1926) considers D. hallezii insufficiently described, and calls it a nomen nudum, which is impossible, as it is described. He refers to a "nomen dubium" or nomen oblitum", which Gieysztor himself explicitly mentions in a footnote on p. 242 in his article of 1938 (Hiermit korrigiere ich den von mir nicht richtig anngewandten Ausdruck (1926) in Bezug auf M. hallezi: "nomen nudum", der durch den Ausdruck "species dubia" ersetzt werden muss). In 1929 (p. 165) Gieysztor considers all following species as synonyms of D. rossi: D hallezii, D. karisalmica, and D. hallezii var. borealis). In his 1938 article (p. 241) Gieysztor again argues quite intensively to consider the species a "nomen dubium" as it has lead to much confusion with several other species (D. brevimana, D. rossi, D. picta) and explicitely argues against future use of the name, because of the complex and confusing application, and the fact that it was inadequetely described. This view seems to be followed by most authors since then, and the name does not appear in literature anymore. Luther mentions it as synonym of both D. brevimana and D. rossi illustrating the complexity of the taxonomical history.
We follow Gieysztor's suggestion, and consider it as a nomen dubium/oblitum, although Ruebush & Hayes mention it as a species of Microdalyellia. [details]