Redescription of Capitella capitata (Fabricius) from West Greenland and designation of a neotype (Polychaeta, Capitellidae)
Capitella capitata (Fabricius, 1780), the type species of the genus, was originally described from the SW coast of Greenland; however, current definitions of the species are largely based on Eisig (1887), who described specimens from Naples on the Mediterranean coast. Eisig’s excellent account of th...
Published in: | Zoosymposia |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Zoosymposia
2009
|
Subjects: | |
Online Access: | http://www.mapress.com/j/zs/article/view/zoosymposia.2.1.7 https://doi.org/10.11646/zoosymposia.2.1.7 |
id |
ftmagnoliapress:oai:ojs.mapress.com:article/14990 |
---|---|
record_format |
openpolar |
spelling |
ftmagnoliapress:oai:ojs.mapress.com:article/14990 2023-05-15T15:04:56+02:00 Redescription of Capitella capitata (Fabricius) from West Greenland and designation of a neotype (Polychaeta, Capitellidae) BLAKE, JAMES A. 2009-08-31 application/pdf http://www.mapress.com/j/zs/article/view/zoosymposia.2.1.7 https://doi.org/10.11646/zoosymposia.2.1.7 eng eng Zoosymposia http://www.mapress.com/j/zs/article/view/zoosymposia.2.1.7/4310 Copyright (c) 2016 Zoosymposia Zoosymposia; Vol 2: 31 August 2009; 55–80 1178-9913 1178-9905 10.11646/zoosymposia.2.1 Type species reproduction larval development info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2009 ftmagnoliapress https://doi.org/10.11646/zoosymposia.2.1.7 2018-08-24T16:38:34Z Capitella capitata (Fabricius, 1780), the type species of the genus, was originally described from the SW coast of Greenland; however, current definitions of the species are largely based on Eisig (1887), who described specimens from Naples on the Mediterranean coast. Eisig’s excellent account of the morphology of a sexually dimorphic species has subsequently been applied to specimens collected from worldwide locations. C. capitata was considered cosmopolitan in its distribution until J.P. Grassle and others identified numerous sibling species in laboratory culture. A large collection of Capitella from locations along the W, SW, and SE coasts of Greenland was provided by the Zoological Museum, University of Copenhagen (ZMUC). The collections included about 680 specimens with distinctive prostomial, thoracic, and setal morphology that differs from the typical depiction of the species in most faunal accounts. A neotype was selected from an excellent collection of approximately 250 specimens from Mârmorilik on the Affarlikassâ Fjord on the inner Uummannaq Fjord system, north of Disko Bay. All available collections from the ZMUC are believed to belong to the same species, which is here considered to be Arctic and subarctic in distribution. Additional material from the Alaskan Arctic supports this hypothesis. The Greenland species has a short, cup-shaped, wider-than-long prostomium joined to a narrow peristomial ring that is retracted slightly into setiger 1. In most specimens, the first four thoracic setigers gradually increase in size, with setiger 4 being the largest thoracic segment, and then decrease over the next five setigers, with setiger 9 being smaller than subsequent anterior abdominal segments. The thoracic region is thus markedly distinct visually from the abdominal region. Setigers 8–9 typically lack fascicles of notosetae, but 80% of the specimens examined have genital spines and most have copulatory organs that are secretory in nature: they contain numerous small secretion granules but no sperm. Many of these specimens have eggs and larvae within their tubes, suggesting functional hermaphroditism. The present redescription of C. capitata serves to establish a baseline against which the many known but undescribed species can be compared. Previous accounts of C. capitata based on the Eisig concept and largely from boreal and temperate localities should be reevaluated. Article in Journal/Newspaper Arctic Disko Bay Greenland Subarctic Uummannaq Magnolia press Arctic Greenland Uummannaq Fjord ENVELOPE(-52.968,-52.968,70.925,70.925) Zoosymposia 2 1 55 80 |
institution |
Open Polar |
collection |
Magnolia press |
op_collection_id |
ftmagnoliapress |
language |
English |
topic |
Type species reproduction larval development |
spellingShingle |
Type species reproduction larval development BLAKE, JAMES A. Redescription of Capitella capitata (Fabricius) from West Greenland and designation of a neotype (Polychaeta, Capitellidae) |
topic_facet |
Type species reproduction larval development |
description |
Capitella capitata (Fabricius, 1780), the type species of the genus, was originally described from the SW coast of Greenland; however, current definitions of the species are largely based on Eisig (1887), who described specimens from Naples on the Mediterranean coast. Eisig’s excellent account of the morphology of a sexually dimorphic species has subsequently been applied to specimens collected from worldwide locations. C. capitata was considered cosmopolitan in its distribution until J.P. Grassle and others identified numerous sibling species in laboratory culture. A large collection of Capitella from locations along the W, SW, and SE coasts of Greenland was provided by the Zoological Museum, University of Copenhagen (ZMUC). The collections included about 680 specimens with distinctive prostomial, thoracic, and setal morphology that differs from the typical depiction of the species in most faunal accounts. A neotype was selected from an excellent collection of approximately 250 specimens from Mârmorilik on the Affarlikassâ Fjord on the inner Uummannaq Fjord system, north of Disko Bay. All available collections from the ZMUC are believed to belong to the same species, which is here considered to be Arctic and subarctic in distribution. Additional material from the Alaskan Arctic supports this hypothesis. The Greenland species has a short, cup-shaped, wider-than-long prostomium joined to a narrow peristomial ring that is retracted slightly into setiger 1. In most specimens, the first four thoracic setigers gradually increase in size, with setiger 4 being the largest thoracic segment, and then decrease over the next five setigers, with setiger 9 being smaller than subsequent anterior abdominal segments. The thoracic region is thus markedly distinct visually from the abdominal region. Setigers 8–9 typically lack fascicles of notosetae, but 80% of the specimens examined have genital spines and most have copulatory organs that are secretory in nature: they contain numerous small secretion granules but no sperm. Many of these specimens have eggs and larvae within their tubes, suggesting functional hermaphroditism. The present redescription of C. capitata serves to establish a baseline against which the many known but undescribed species can be compared. Previous accounts of C. capitata based on the Eisig concept and largely from boreal and temperate localities should be reevaluated. |
format |
Article in Journal/Newspaper |
author |
BLAKE, JAMES A. |
author_facet |
BLAKE, JAMES A. |
author_sort |
BLAKE, JAMES A. |
title |
Redescription of Capitella capitata (Fabricius) from West Greenland and designation of a neotype (Polychaeta, Capitellidae) |
title_short |
Redescription of Capitella capitata (Fabricius) from West Greenland and designation of a neotype (Polychaeta, Capitellidae) |
title_full |
Redescription of Capitella capitata (Fabricius) from West Greenland and designation of a neotype (Polychaeta, Capitellidae) |
title_fullStr |
Redescription of Capitella capitata (Fabricius) from West Greenland and designation of a neotype (Polychaeta, Capitellidae) |
title_full_unstemmed |
Redescription of Capitella capitata (Fabricius) from West Greenland and designation of a neotype (Polychaeta, Capitellidae) |
title_sort |
redescription of capitella capitata (fabricius) from west greenland and designation of a neotype (polychaeta, capitellidae) |
publisher |
Zoosymposia |
publishDate |
2009 |
url |
http://www.mapress.com/j/zs/article/view/zoosymposia.2.1.7 https://doi.org/10.11646/zoosymposia.2.1.7 |
long_lat |
ENVELOPE(-52.968,-52.968,70.925,70.925) |
geographic |
Arctic Greenland Uummannaq Fjord |
geographic_facet |
Arctic Greenland Uummannaq Fjord |
genre |
Arctic Disko Bay Greenland Subarctic Uummannaq |
genre_facet |
Arctic Disko Bay Greenland Subarctic Uummannaq |
op_source |
Zoosymposia; Vol 2: 31 August 2009; 55–80 1178-9913 1178-9905 10.11646/zoosymposia.2.1 |
op_relation |
http://www.mapress.com/j/zs/article/view/zoosymposia.2.1.7/4310 |
op_rights |
Copyright (c) 2016 Zoosymposia |
op_doi |
https://doi.org/10.11646/zoosymposia.2.1.7 |
container_title |
Zoosymposia |
container_volume |
2 |
container_issue |
1 |
container_start_page |
55 |
op_container_end_page |
80 |
_version_ |
1766336678931202048 |