WoRMS source details

Struck, Torsten H.; Koczula, Jens; Stateczny, Dave; Meyer, Christian A.; Purschke, Günter. (2017). Two new species in the annelid genus Stygocapitella (Orbiniida, Parergodrilidae) with comments on their biogeography. Zootaxa. 4286(3): 301-332.
279159
10.11646/zootaxa.4286.3.1 [view]
urn:lsid:zoobank.org:pub:0243895E-1676-4931-A5C8-8A41D214481B [view]
Struck, Torsten H.; Koczula, Jens; Stateczny, Dave; Meyer, Christian A.; Purschke, Günter
2017
Two new species in the annelid genus <em>Stygocapitella</em> (Orbiniida, Parergodrilidae) with comments on their biogeography
Zootaxa
4286(3): 301-332
Publication
World Polychaeta Database (WPolyDb)
Many interstitial species with limited dispersal capacity are in fact complexes of cryptic species showing a seemingly cosmopolitan distribution. The interstitial annelid Stygocapitella subterranea (Orbiniida, Parergodrilidae) is such a complex with populations in Northern America, Europe, Australia, and New Zealand and a tropical distribution gap. Herein we present new records of Stygocapitella from South Africa, which is morphologically substantially different from S. subterranea . Additionally, using specimens from both hemispheres and morphological, nuclear and mitochondrial data as well as principal component analyses and a newly developed measurement for morphological disparity we show furthermore that the cryptic species complex of S. subterranea is not as cryptic as assumed as the Australian populations are morphologically and genetically different from the European population. Hence, we herein describe two new species, S. minuta and S. australis , within this complex from the Southern hemisphere. Additionally, we assigned a neotype for S. subterranea . This increases numbers of species known for Stygocapitella from one to three and for Parergodrilidae from two to four. Moreover, our results support an origin of this species complex on the Southern hemisphere and that both the split of S. minuta from the other two and S. subterranea from S. australis was several tens of millions years ago. Hence, the distribution of this complex was not driven by recent events, but rather it represents a strong case of decelerated morphological evolution as only slight differences in the morphology could be observed after all
Systematics, Taxonomy
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2017-07-02 20:49:35Z
created

Holotype NHM NHMO C6959, geounit Saldanha Bay, identified as Stygocapitella minuta Struck, Koczula, Stateczny, Meyer & Purschke, 2017
Neotype NHM NHMO C6961, geounit Kieler Bucht, identified as Stygocapitella subterranea Knöllner, 1934
Holotype WAM V8605, geounit Western Australia, identified as Stygocapitella australis Struck, Koczula, Stateczny, Meyer & Purschke, 2017
 Diagnosis

Marine Parergodrilidae with broadly rounded prostomium without appendages; peristomium followed by 13 segments and ... [details]

 Etymology

Latin for southern, 'australis' refers to the first record of stygocapitella from Australia. [details]

 Etymology

Latin minuta (small) refers to the small size of this species in comparison to its two congeners [details]

 Neotype

NHMO C6961, Natural History Museum of the University of Oslo, colleted Schilksee, near Kiel. [details]

 Type locality

upper shore Gnarabup Beach, W Australia, -33.9850°, 114.9904° (33° 59.097' S, 114° 59.421' E) [details]

 Type locality

upper shore, Langebaan, Saldanha Bay, South Africa -33.0813° 18.0320° (33° 04.880' S, 018° 01.919' E) [details]

 Type locality

Originally collected on the coast at Schilksee, near Kiel, Germany. Neotype published by Struck et al (2017: 316) ... [details]