Chandraniscus negoescuae George 2004, n. sp.
Chandraniscus negoescuae n. sp. (figure 7) Diagnosis. Chandraniscus with cephalon having a convex anterior margin and lacking a median projection. Posterior three pereonites showing a clear decrease in width from pereonites 5–7. Pleotelson shield-like, with the sharp posterolateral angles and the ur...
Main Author: | |
---|---|
Format: | Text |
Language: | unknown |
Published: |
Zenodo
2004
|
Subjects: | |
Online Access: | https://dx.doi.org/10.5281/zenodo.5259759 https://zenodo.org/record/5259759 |
id |
ftdatacite:10.5281/zenodo.5259759 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Biodiversity Taxonomy Animalia Arthropoda Malacostraca Isopoda Haploniscidae Chandraniscus Chandraniscus negoescuae |
spellingShingle |
Biodiversity Taxonomy Animalia Arthropoda Malacostraca Isopoda Haploniscidae Chandraniscus Chandraniscus negoescuae George, Robert Y. Chandraniscus negoescuae George 2004, n. sp. |
topic_facet |
Biodiversity Taxonomy Animalia Arthropoda Malacostraca Isopoda Haploniscidae Chandraniscus Chandraniscus negoescuae |
description |
Chandraniscus negoescuae n. sp. (figure 7) Diagnosis. Chandraniscus with cephalon having a convex anterior margin and lacking a median projection. Posterior three pereonites showing a clear decrease in width from pereonites 5–7. Pleotelson shield-like, with the sharp posterolateral angles and the uropods extending beyond the rounded apex of the pleotelson. Antenna 1 with flagellum of five articles, antenna 2 with flagellum of 11 articles. Depth is the minimum depth of occurrence; distribution is the general zoogeographic area of distribution. *Eurybathyal species. Material examined . Holotype: intersex, length 2.1 mm, maximum width 0.9 mm. USNM Cat. No. 138675. Type locality . R / V Eastward Sta. 7810, site Sigma over the continental rise off North Carolina. Etymology . This new species is named in honour of the Romanian isopodologist Dr Ileana Negoescu with whom I had the pleasure of studying the Antarctic anthurid isopods at the Antipa Museum of Natural History, Bucharest, in the summer of 1979. Description. Body oval, cephalon broadly rounded anteriorly without a median projection. Cephalon almost twice as long as the first pereonite. Anterior three pereonites subequal in length, pereonite 4 longer than any anterior pereonite. Lateral sutures between anterior five pereonites well-developed. Pereonite 5 significantly longer than either pereonite 6 or 7. Pleotelson shield-like, with posterolateral angles produced, slightly beyond the rounded posterior apex. Pleotelson as long as the posterior three pereonites combined. Antenna 1 with basal peduncular article partly concealed by the cephalon and second article elongated, with a flagellum of five articles. Antenna 2 with four peduncular articles, basal two articles short, articles 2 and 3 elongated, with a flagellum of 11 articles. The type specimen is unique, with both male and female secondary sexual appendages and is undoubtedly not a manca since pereonite 7 is well-developed. It is known that asellote isopods, in the early stage of ontogenetic development, seem morphologically more like female than male. It is also known that the intersex phenomenon is rare but still seen in asellote isopods. This species is based on a unique ‘intersex’ specimen. In figure 7E, the female operculum is illustrated, with the male pleopod 1, and underneath the male pleopod 2 showing the stylet. Remarks . In the shape of the shield-like pleotelson, this new species resembles both C . kussakini from site Alpha-A off Bermuda and also C. costlowi from site Beta on the Carolina lower slope. However, this species has a cephalon with rounded anterior margin, while C. kussakini has a quandrangular cephalon with anterolateral spines. This species is also distinguished from C. costlowi which has a well-defined median cephalic projection. Chandraniscus negoescuae n. sp. is dissimilar to the northern species C. excisus (Richardson, 1908) which lacks the lateral sutures between the anterior pereonites and has a differently shaped pleotelson. : Published as part of George, Robert Y., 2004, Deep-sea asellote isopods (Crustacea, Eumalacostraca) of the north-west Atlantic: the family Haploniscidae, pp. 337-373 in Journal of Natural History 38 (3) on pages 348-351, DOI: 10.1080/0022293021000030844, http://zenodo.org/record/5258656 |
format |
Text |
author |
George, Robert Y. |
author_facet |
George, Robert Y. |
author_sort |
George, Robert Y. |
title |
Chandraniscus negoescuae George 2004, n. sp. |
title_short |
Chandraniscus negoescuae George 2004, n. sp. |
title_full |
Chandraniscus negoescuae George 2004, n. sp. |
title_fullStr |
Chandraniscus negoescuae George 2004, n. sp. |
title_full_unstemmed |
Chandraniscus negoescuae George 2004, n. sp. |
title_sort |
chandraniscus negoescuae george 2004, n. sp. |
publisher |
Zenodo |
publishDate |
2004 |
url |
https://dx.doi.org/10.5281/zenodo.5259759 https://zenodo.org/record/5259759 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic North West Atlantic |
genre_facet |
Antarc* Antarctic North West Atlantic |
op_relation |
http://zenodo.org/record/5258656 http://publication.plazi.org/id/FFA0FF00D055FFE1FFC0FFFA307E036E https://zenodo.org/communities/biosyslit https://dx.doi.org/10.1080/0022293021000030844 http://zenodo.org/record/5258656 http://publication.plazi.org/id/FFA0FF00D055FFE1FFC0FFFA307E036E https://dx.doi.org/10.5281/zenodo.5259760 https://zenodo.org/communities/biosyslit |
op_rights |
Open Access info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5281/zenodo.5259759 https://doi.org/10.1080/0022293021000030844 https://doi.org/10.5281/zenodo.5259760 |
_version_ |
1766265450729046016 |
spelling |
ftdatacite:10.5281/zenodo.5259759 2023-05-15T13:57:40+02:00 Chandraniscus negoescuae George 2004, n. sp. George, Robert Y. 2004 https://dx.doi.org/10.5281/zenodo.5259759 https://zenodo.org/record/5259759 unknown Zenodo http://zenodo.org/record/5258656 http://publication.plazi.org/id/FFA0FF00D055FFE1FFC0FFFA307E036E https://zenodo.org/communities/biosyslit https://dx.doi.org/10.1080/0022293021000030844 http://zenodo.org/record/5258656 http://publication.plazi.org/id/FFA0FF00D055FFE1FFC0FFFA307E036E https://dx.doi.org/10.5281/zenodo.5259760 https://zenodo.org/communities/biosyslit Open Access info:eu-repo/semantics/openAccess Biodiversity Taxonomy Animalia Arthropoda Malacostraca Isopoda Haploniscidae Chandraniscus Chandraniscus negoescuae Text Taxonomic treatment article-journal ScholarlyArticle 2004 ftdatacite https://doi.org/10.5281/zenodo.5259759 https://doi.org/10.1080/0022293021000030844 https://doi.org/10.5281/zenodo.5259760 2021-11-05T12:55:41Z Chandraniscus negoescuae n. sp. (figure 7) Diagnosis. Chandraniscus with cephalon having a convex anterior margin and lacking a median projection. Posterior three pereonites showing a clear decrease in width from pereonites 5–7. Pleotelson shield-like, with the sharp posterolateral angles and the uropods extending beyond the rounded apex of the pleotelson. Antenna 1 with flagellum of five articles, antenna 2 with flagellum of 11 articles. Depth is the minimum depth of occurrence; distribution is the general zoogeographic area of distribution. *Eurybathyal species. Material examined . Holotype: intersex, length 2.1 mm, maximum width 0.9 mm. USNM Cat. No. 138675. Type locality . R / V Eastward Sta. 7810, site Sigma over the continental rise off North Carolina. Etymology . This new species is named in honour of the Romanian isopodologist Dr Ileana Negoescu with whom I had the pleasure of studying the Antarctic anthurid isopods at the Antipa Museum of Natural History, Bucharest, in the summer of 1979. Description. Body oval, cephalon broadly rounded anteriorly without a median projection. Cephalon almost twice as long as the first pereonite. Anterior three pereonites subequal in length, pereonite 4 longer than any anterior pereonite. Lateral sutures between anterior five pereonites well-developed. Pereonite 5 significantly longer than either pereonite 6 or 7. Pleotelson shield-like, with posterolateral angles produced, slightly beyond the rounded posterior apex. Pleotelson as long as the posterior three pereonites combined. Antenna 1 with basal peduncular article partly concealed by the cephalon and second article elongated, with a flagellum of five articles. Antenna 2 with four peduncular articles, basal two articles short, articles 2 and 3 elongated, with a flagellum of 11 articles. The type specimen is unique, with both male and female secondary sexual appendages and is undoubtedly not a manca since pereonite 7 is well-developed. It is known that asellote isopods, in the early stage of ontogenetic development, seem morphologically more like female than male. It is also known that the intersex phenomenon is rare but still seen in asellote isopods. This species is based on a unique ‘intersex’ specimen. In figure 7E, the female operculum is illustrated, with the male pleopod 1, and underneath the male pleopod 2 showing the stylet. Remarks . In the shape of the shield-like pleotelson, this new species resembles both C . kussakini from site Alpha-A off Bermuda and also C. costlowi from site Beta on the Carolina lower slope. However, this species has a cephalon with rounded anterior margin, while C. kussakini has a quandrangular cephalon with anterolateral spines. This species is also distinguished from C. costlowi which has a well-defined median cephalic projection. Chandraniscus negoescuae n. sp. is dissimilar to the northern species C. excisus (Richardson, 1908) which lacks the lateral sutures between the anterior pereonites and has a differently shaped pleotelson. : Published as part of George, Robert Y., 2004, Deep-sea asellote isopods (Crustacea, Eumalacostraca) of the north-west Atlantic: the family Haploniscidae, pp. 337-373 in Journal of Natural History 38 (3) on pages 348-351, DOI: 10.1080/0022293021000030844, http://zenodo.org/record/5258656 Text Antarc* Antarctic North West Atlantic DataCite Metadata Store (German National Library of Science and Technology) Antarctic The Antarctic |