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Polychaeta source details
Blake, James A. (2015). New species of Scalibregmatidae (Annelida, Polychaeta) from the East Antarctic Peninsula including a description of the ecology and post-larval development of species of Scalibregma and Oligobregma. Zootaxa. 4033(1): 57-93.
220436
10.11646/zootaxa.4033.1.3 [view]
urn:lsid:zoobank.org:pub:9C0A63B6-5532-484D-BBD7-EDD5250D4ABA [view]
Blake, James A.
2015
New species of Scalibregmatidae (Annelida, Polychaeta) from the East Antarctic Peninsula including a description of the ecology and post-larval development of species of <em>Scalibregma </em>and <em>Oligobregma</em>
Zootaxa
4033(1): 57-93
Publication
World Polychaeta Database (WPolyDb). Open access at Zootaxa
A large collection of scalibregmatid polychaetes from the east Antarctic Peninsula in May 2000 has yielded specimens of three new species of Scalibregma, Pseudoscalibregma, and Oligobregma. The new species of Scalibregma is represented by more than 400 specimens that include post-larval and juvenile forms which, for the first time, provide data on the sequence of development of key characters of a scalibregmatid. These data demonstrate that taxonomic characters including the form of the prostomium and presence of branchiae develop late in ontogeny and that small specimens cannot be reliably referred to a species or genus without a growth sequence. Juvenile morphology is also presented for the new species of Oligobregma. The new species of Scalibregma is compared with five northern hemisphere species and differs in details of the peristomium, upper and lower lips of the mouth, dorsal and ventral cirri, and nature of the short spinous setae of setiger 1. The new species of Pseudoscalibregma is unique in the nature of asymmetrical ventral cirri of posterior setigers. The new species of Oligobregma has large acicular spines in both noto- and neuropodia and these are present in juveniles. However, the final adult configuration of the prostomium is not evident until late in development. The taxonomic significance of the timing of development of post-larval and juvenile morphology elucidated in this study is discussed in relation to the validity of certain taxa and the current system of genera used in the family.
Antarctic
Date action by
Lipobranchus jeffreysii [auct.] accepted as Lipobranchius jeffreysii (McIntosh, 1869) (additional source)
Neolipobranchius Hartman & Fauchald, 1971 (status source) Neolipobranchius blakei Kudenov, 1985 (status source) Neolipobranchius glabrus Hartman & Fauchald, 1971 (redescription) Oligobregma hartmanae Blake, 1981 accepted as Pseudoscalibregma hartmanae (Blake, 1981) (new combination reference) Oligobregma mucronata Blake, 2015 (original description) Pseudoscalibregma bransfieldium (Hartman, 1967) (additional source) Pseudoscalibregma hartmanae (Blake, 1981) (basis of record) Pseudoscalibregma palmeri Blake, 2015 (original description) Scalibregma australis Blake, 2015 (original description) Scalibregma californicum Blake, 2000 (additional source) Scalibregma celticum Mackie, 1991 (additional source) Scalibregma hanseni Bakken, Oug & Kongsrud, 2014 (additional source) Scalibregma inflatum Rathke, 1843 (additional source) Scalibregma stenocerum (Bertelsen & Weston, 1980) (additional source)
Nontype AM, geounit East Antarctic Wilkes Land, identified as Scalibregma australis Blake, 2015
Paratype USNM 1281909, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Paratype USNM 1281910, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Paratype USNM 1281911, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Paratype USNM 1281912, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Paratype USNM 1281913, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Paratype USNM 1281914, geounit Antarctic Peninsula, identified as Oligobregma mucronata Blake, 2015 Paratype MCZ 60891, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Paratype MCZ 60892, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Paratype MCZ 60892, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Paratype MCZ 60893, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Oligobregma mucronata Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Oligobregma mucronata Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Oligobregma mucronata Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Oligobregma mucronata Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Oligobregma mucronata Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Oligobregma mucronata Blake, 2015 Nontype Private J.A. Blake, geounit Antarctic Peninsula, identified as Oligobregma mucronata Blake, 2015 Paratype LACM Poly 7001, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Paratype LACM Poly 7002, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Holotype LACM Poly 7003, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Paratype LACM Poly 7004, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Paratype LACM Poly 7005, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Paratype LACM Poly 7006, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Paratype LACM Poly 7007, geounit Antarctic Peninsula, identified as Scalibregma australis Blake, 2015 Paratype LACM Poly 7008, geounit Antarctic Peninsula, identified as Pseudoscalibregma palmeri Blake, 2015 Holotype LACM Poly 7009, geounit Weddell Sea, identified as Pseudoscalibregma palmeri Blake, 2015 Nontype LACM Poly 7010, geounit Antarctic Peninsula, identified as Pseudoscalibregma bransfieldium (Hartman, 1967) Paratype LACM Poly 7011, geounit Antarctic Peninsula, identified as Oligobregma mucronata Blake, 2015 Paratype LACM Poly 7012, geounit Antarctic Peninsula, identified as Oligobregma mucronata Blake, 2015 Holotype LACM Poly 7013, geounit Antarctic Peninsula, identified as Oligobregma mucronata Blake, 2015 Paratype LACM Poly 7014, geounit Antarctic Peninsula, identified as Oligobregma mucronata Blake, 2015 Diagnosis "Body elongate and arenicoliform. Prostomium T-shaped with two prominent frontal horns; eyes present or absent; ... [details] Diagnosis "Body elongate, arenicoliform. Prostomium T-shaped with lateral horns. Peristomium achaetous, surrounding ... [details] Diagnosis "Body elongate, arenicoliform. Prostomium T-shaped with lateral horns. Peristomium achaetous, surrounding ... [details] Distribution Southern Ocean: East Antarctic Peninsula, former Larsen Ice Shelf A area. [details] Distribution Widespread in Antarctic seas. [details] Distribution Southern Ocean: Antarctic Peninsula. Known only from the vicinity of the Larsen Ice Shelf A area of the Weddell Sea ... [details] Distribution Southern Ocean. Widespread on both sides of the Antarctic Peninsula: Weddell Sea, Larsen Ice Shelf area, Prince ... [details] Etymology The specific epithet mucronata is the Latin adjective for 'pointed', and refers to the sharply pointed thin ... [details] Etymology The specific epithet palmeri derives from the name of the RVIB Nathaniel B. Palmer, research vessel of the United ... [details] Etymology The specific epithet australis is the Latin word for 'southern', and refers to the distribution of the species, ... [details] Habitat Sediments coarse-grained in the upper 5 cm near the surface, overlying fine-grained silt and clay size sediments ... [details] Habitat Not stated specifically, but considering data from nearby stations, probably from sediments dominated by silt and ... [details] Habitat Mainly sediments dominated by silt and clay, but also in sand and gravel. [details] Identification Blake (2015: 90) re-examined specimen and stated "Neolipobranchus blakei Kudenov, 1985 the second species described ... [details] Identification Blake (2015: 89) determined the specimen was an indeterminable juvenile polychaete, not certainly identifiable even ... [details] Reproduction Sperm platelets observed in one large paratype measuring 10 mm long with 27 chaetigers. Individual sperm observed ... [details] Reproduction Oval sperm platelets observed in coelomic smears from a few large specimens (20 mm or more in length). Individual ... [details] Status The holotype of N. glabrus is not identifiable to genus or species and is a juvenile (fide Blake 2015: [as spelling ... [details] Status Blake (2015: 80) states that Oligobregma blakei Schüller & Hilbig, 2007 is a juvenile, probably belonging to a ... [details] Type locality Southern Ocean, East Antarctic Peninsula, Larsen-A Ice Shelf Area, Greenpeace Trough, Sta. NBP-21 (64º45.827'S, ... [details] Type locality Southern Ocean, Antarctica, East Antarctic Peninsula, Weddell Sea, off Lindenberg Island, Sta. NBP-03 ... [details] Type locality Southern Ocean, East Antarctic Peninsula, Larsen Ice Shelf Area, Greenpeace Trough, Sta. NBP-04 (64º49.209'S, ... [details] Type specimen The monograph does not state where the type material is deposited. Blake (2015) revised the holotype, stating that ... [details] |