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Polychaeta source details

Worsaae, Katrine; Giribet, Gonzalo; Martínez, Alejandro. (2018). The role of progenesis in the diversification of the interstitial annelid lineage Psammodrilidae. Invertebrate Systematics. 32(4): 774-793.
303558
10.1071/is17063 [view]
Worsaae, Katrine; Giribet, Gonzalo; Martínez, Alejandro
2018
The role of progenesis in the diversification of the interstitial annelid lineage Psammodrilidae
Invertebrate Systematics
32(4): 774-793
Publication
World Polychaeta Database (WPolyDb)
Available for editors  PDF available [request]
Psammodrilidae constitutes a family of understudied, nearly completely ciliated, small-sized annelids, whose systematic position in Annelida remains unsettled and whose internal phylogeny is here investigated for the first time. Psammodrilids possess hooked chaetae typical of macroscopic tube-dwelling semi-sessile annelids, such as Arenicolidae. Yet, several minute members resemble, with their conspicuous gliding by ciliary motion and vagile lifestyle, interstitial fauna, adapted to move between sand grains. Moreover, psammodrilids exhibit a range of unique features, for example, bendable aciculae, a collar region with polygonal unciliated cells, and a muscular pumping pharynx. We here present a combined phylogeny of Psammodrilidae including molecular and morphological data of all eight described species (two described herein as Psammodrilus didomenicoi, sp. nov. and P. norenburgi, sp. nov.) as well as four undescribed species. Ancestral character state reconstruction suggests the ancestor of Psammodrilidae was a semi-sessile larger form. Miniaturisation seems to have occurred multiple times independently within Psammodrilidae, possibly through progenesis, yielding small species with resemblance to a juvenile stage of the larger species. We find several new cryptic species and generally reveal an unexpected diversity and distribution of this small family. This success may be favoured by their adaptive morphology, here indicated to be genetically susceptible to progenesis. Corresponding author email: kworsaae@bio.ku.dk
Systematics, Taxonomy
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Date
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2018-08-03 02:38:46Z
created
2018-10-18 03:04:10Z
changed

Holotype NHMD NHMD-205502, geounit Gulf of Naples (Italy), identified as Psammodrilus didomenicoi Worsaae & Martínez in Worsaae et al., 2018
Holotype NHMD NHMD-205518, geounit Bocas del Toro, identified as Psammodrilus norenburgi Worsaae & Martínez in Worsaae et al., 2018
 Etymology

After Maikon Di Domenico, who helped collect the new species [details]

 Etymology

After Jon Norenburg, who organised the event at Bocas del Toro in 2010, during which the new species was collected. [details]

 Nomenclature

There is no type-deposition statement, although ICZN 4th edition Article 16.4.2 requires one. [details]

 Nomenclature

There is no type-deposition statement, although ICZN 4th edition Article 16.4.2 requires one. [details]

 Type locality

entrance to a marine cave, Punta Campanella, Scuollo d’Isca, Gulf of Napoli, Italy, 40.587 N, 14.377 E, 20 m [details]

 Type locality

Wild Deep Cave, Bocas del Toro, Panama, Caribbean Sea, 9.351 N 82.172 W, 15 m [details]