Polyzoa minor Monniot 1970
Polyzoa minor Monniot, 1970 Fig. 11 References and synonymy: Polyzoa minor (Monniot 1970) p. 346; Monniot & Monniot (1973) p. 721. Localities: 6 N. We have found one colony of this colonial Styelidae, in the underside of a shallow boulder. The zooids (up to 3 mm in height) are united by stolons....
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2016
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Online Access: | https://dx.doi.org/10.5281/zenodo.5630335 https://zenodo.org/record/5630335 |
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ftdatacite:10.5281/zenodo.5630335 |
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openpolar |
institution |
Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Biodiversity Taxonomy Animalia Chordata Ascidiacea Pleurogona Styelidae Polyzoa Polyzoa minor |
spellingShingle |
Biodiversity Taxonomy Animalia Chordata Ascidiacea Pleurogona Styelidae Polyzoa Polyzoa minor Turon, Xavier Cañete, Juan I. Sellanes, Javier Rocha, Rosana M. López-Legentil, Susanna Polyzoa minor Monniot 1970 |
topic_facet |
Biodiversity Taxonomy Animalia Chordata Ascidiacea Pleurogona Styelidae Polyzoa Polyzoa minor |
description |
Polyzoa minor Monniot, 1970 Fig. 11 References and synonymy: Polyzoa minor (Monniot 1970) p. 346; Monniot & Monniot (1973) p. 721. Localities: 6 N. We have found one colony of this colonial Styelidae, in the underside of a shallow boulder. The zooids (up to 3 mm in height) are united by stolons. There are small zooids and buds along the stolons. The tunic is whitishbrownish. Internally, there are about a dozen well-developed tentacles (and smaller ones in-between) and the neural gland opens in a vertical slit. The branchial sac has 6 longitudinal vessels on the right and 4 on the left. There are 7– 9 stigmata, with parastigmatic vessels, in the wider meshes. The digestive system forms an open loop and ends in a slightly bilobed anus. The stomach has ca. 12 folds and a long and curved pyloric caecum. There are three elongated endocarps attached to the body wall at each side. There are up to 12 hermaphrodite gonads on the right, alongside the endostyle. They are sac-like or elongated, with a wide female opening at one end, and a male opening forming a slender tube in sub-terminal position. In some cases the posterior gonads have only a ball-like male follicle. On the left there are from 2 to 6 gonads. When there are only two they are exclusively male. When they are more numerous, the posterior ones are hermaphrodite and the anterior ones male only. There are numerous larvae in incubation in the peribranchial cavity of some zooids. The larvae have a trunk length of up to 0.7 mm, three conical adhesive papillae and a single pigment spot. Remarks. Monniot (1970) stressed that the species of the genus Polyzoa can be distinguished first by the number of branchial vessels, then by the structure of the stomach folds and, finally, by the form and shape of the colony. Our specimens, with 6 and 4 longitudinal vessels at each side, agree with the description of P. minor from the Kerguelen Islands (Monniot 1970). In a second report (Monniot & Monniot 1973) gives a more detailed description, highlighting some variability in the number of branchial vessels and the number of gonads. Our specimens have in general more gonads than described (up to 8 on the right and 4 on the left), but the general characters are in good agreement with the descriptions. The larvae are here mentioned for the first time in this species. The fact that the species has been so far reported only from the Kerguelen Islands (S Indian Ocean) casts some doubt about its identification. There may be several Polyzoa with small zooids and more observations and genetic analyses are called for to clarify their taxonomic status. For the time being, in absence of clear discriminating characters, we assign this specimen to P. m i n or and expand therefore its distribution range to temperate E Pacific. : Published as part of Turon, Xavier, Cañete, Juan I., Sellanes, Javier, Rocha, Rosana M. & López-Legentil, Susanna, 2016, Ascidian fauna (Tunicata, Ascidiacea) of subantarctic and temperate regions of Chile, pp. 151-180 in Zootaxa 4093 (2) on pages 169-170, DOI: 10.11646/zootaxa.4093.2.1, http://zenodo.org/record/267667 |
format |
Text |
author |
Turon, Xavier Cañete, Juan I. Sellanes, Javier Rocha, Rosana M. López-Legentil, Susanna |
author_facet |
Turon, Xavier Cañete, Juan I. Sellanes, Javier Rocha, Rosana M. López-Legentil, Susanna |
author_sort |
Turon, Xavier |
title |
Polyzoa minor Monniot 1970 |
title_short |
Polyzoa minor Monniot 1970 |
title_full |
Polyzoa minor Monniot 1970 |
title_fullStr |
Polyzoa minor Monniot 1970 |
title_full_unstemmed |
Polyzoa minor Monniot 1970 |
title_sort |
polyzoa minor monniot 1970 |
publisher |
Zenodo |
publishDate |
2016 |
url |
https://dx.doi.org/10.5281/zenodo.5630335 https://zenodo.org/record/5630335 |
geographic |
Kerguelen Kerguelen Islands Pacific Indian |
geographic_facet |
Kerguelen Kerguelen Islands Pacific Indian |
genre |
Kerguelen Islands |
genre_facet |
Kerguelen Islands |
op_relation |
http://zenodo.org/record/267667 http://publication.plazi.org/id/FFF1F62CFF99FFB3FFE0B677FFED3076 http://zoobank.org/ECC66298-6885-47B3-B797-8D30AA05927F https://zenodo.org/communities/biosyslit https://dx.doi.org/10.11646/zootaxa.4093.2.1 http://zenodo.org/record/267667 http://publication.plazi.org/id/FFF1F62CFF99FFB3FFE0B677FFED3076 https://dx.doi.org/10.5281/zenodo.267678 http://zoobank.org/ECC66298-6885-47B3-B797-8D30AA05927F https://dx.doi.org/10.5281/zenodo.5630336 https://zenodo.org/communities/biosyslit |
op_rights |
Open Access info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5281/zenodo.5630335 https://doi.org/10.11646/zootaxa.4093.2.1 https://doi.org/10.5281/zenodo.267678 https://doi.org/10.5281/zenodo.5630336 |
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ftdatacite:10.5281/zenodo.5630335 2023-05-15T17:02:06+02:00 Polyzoa minor Monniot 1970 Turon, Xavier Cañete, Juan I. Sellanes, Javier Rocha, Rosana M. López-Legentil, Susanna 2016 https://dx.doi.org/10.5281/zenodo.5630335 https://zenodo.org/record/5630335 unknown Zenodo http://zenodo.org/record/267667 http://publication.plazi.org/id/FFF1F62CFF99FFB3FFE0B677FFED3076 http://zoobank.org/ECC66298-6885-47B3-B797-8D30AA05927F https://zenodo.org/communities/biosyslit https://dx.doi.org/10.11646/zootaxa.4093.2.1 http://zenodo.org/record/267667 http://publication.plazi.org/id/FFF1F62CFF99FFB3FFE0B677FFED3076 https://dx.doi.org/10.5281/zenodo.267678 http://zoobank.org/ECC66298-6885-47B3-B797-8D30AA05927F https://dx.doi.org/10.5281/zenodo.5630336 https://zenodo.org/communities/biosyslit Open Access info:eu-repo/semantics/openAccess Biodiversity Taxonomy Animalia Chordata Ascidiacea Pleurogona Styelidae Polyzoa Polyzoa minor Taxonomic treatment article-journal Text ScholarlyArticle 2016 ftdatacite https://doi.org/10.5281/zenodo.5630335 https://doi.org/10.11646/zootaxa.4093.2.1 https://doi.org/10.5281/zenodo.267678 https://doi.org/10.5281/zenodo.5630336 2022-02-08T12:23:07Z Polyzoa minor Monniot, 1970 Fig. 11 References and synonymy: Polyzoa minor (Monniot 1970) p. 346; Monniot & Monniot (1973) p. 721. Localities: 6 N. We have found one colony of this colonial Styelidae, in the underside of a shallow boulder. The zooids (up to 3 mm in height) are united by stolons. There are small zooids and buds along the stolons. The tunic is whitishbrownish. Internally, there are about a dozen well-developed tentacles (and smaller ones in-between) and the neural gland opens in a vertical slit. The branchial sac has 6 longitudinal vessels on the right and 4 on the left. There are 7– 9 stigmata, with parastigmatic vessels, in the wider meshes. The digestive system forms an open loop and ends in a slightly bilobed anus. The stomach has ca. 12 folds and a long and curved pyloric caecum. There are three elongated endocarps attached to the body wall at each side. There are up to 12 hermaphrodite gonads on the right, alongside the endostyle. They are sac-like or elongated, with a wide female opening at one end, and a male opening forming a slender tube in sub-terminal position. In some cases the posterior gonads have only a ball-like male follicle. On the left there are from 2 to 6 gonads. When there are only two they are exclusively male. When they are more numerous, the posterior ones are hermaphrodite and the anterior ones male only. There are numerous larvae in incubation in the peribranchial cavity of some zooids. The larvae have a trunk length of up to 0.7 mm, three conical adhesive papillae and a single pigment spot. Remarks. Monniot (1970) stressed that the species of the genus Polyzoa can be distinguished first by the number of branchial vessels, then by the structure of the stomach folds and, finally, by the form and shape of the colony. Our specimens, with 6 and 4 longitudinal vessels at each side, agree with the description of P. minor from the Kerguelen Islands (Monniot 1970). In a second report (Monniot & Monniot 1973) gives a more detailed description, highlighting some variability in the number of branchial vessels and the number of gonads. Our specimens have in general more gonads than described (up to 8 on the right and 4 on the left), but the general characters are in good agreement with the descriptions. The larvae are here mentioned for the first time in this species. The fact that the species has been so far reported only from the Kerguelen Islands (S Indian Ocean) casts some doubt about its identification. There may be several Polyzoa with small zooids and more observations and genetic analyses are called for to clarify their taxonomic status. For the time being, in absence of clear discriminating characters, we assign this specimen to P. m i n or and expand therefore its distribution range to temperate E Pacific. : Published as part of Turon, Xavier, Cañete, Juan I., Sellanes, Javier, Rocha, Rosana M. & López-Legentil, Susanna, 2016, Ascidian fauna (Tunicata, Ascidiacea) of subantarctic and temperate regions of Chile, pp. 151-180 in Zootaxa 4093 (2) on pages 169-170, DOI: 10.11646/zootaxa.4093.2.1, http://zenodo.org/record/267667 Text Kerguelen Islands DataCite Metadata Store (German National Library of Science and Technology) Kerguelen Kerguelen Islands Pacific Indian |