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A redescription of Syncarpa composita (Ascidiacea, Stolidobranchia) with an inference of its phylogenetic position within Styelidae

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Title: A redescription of Syncarpa composita (Ascidiacea, Stolidobranchia) with an inference of its phylogenetic position within Styelidae
Authors: Hasegawa, Naohiro Browse this author
Kajihara, Hiroshi Browse this author →KAKEN DB
Keywords: Chordata
COI
phylogeny
Sea of Okhotsk
taxonomy
Urochordata
Issue Date: 24-Jun-2019
Publisher: Pensoft Publishers
Journal Title: Zookeys
Volume: 857
Start Page: 1
End Page: 15
Publisher DOI: 10.3897/zookeys.857.32654
PMID: 31293349
Abstract: Two species of styelid colonial ascidians in the genus Syncarpa Redikorzev, 1913 are known from the northwest Pacific. The valid status of the lesser known species, Syncarpa composita (Tokioka, 1951) (type locality: Akkeshi, Japan), is assessed here. To assess the taxonomic identity of S. composita, we compared one of the syntypes and freshly collected topotypes of S. composita with a syntype of S. oviformis Redikorzev, 1913 (type locality: Mandril Bay, Russia). Specimens of S. composita consistently differed from the syntype of S. ovifermis in the number of oral tentacles, the number of size-classes of transverse vessels, and the number of anal lobes. In this paper, S. composita is redescribed as distinct from S. oviformis, and its phylogenetic position inferred within Styelidae based on the 18S rRNA and cytochrome c oxidase subunit I gene sequences. In our phylogenetic tree, Syncarpa formed a well-supported Bade together with Dendrodoa MacLeay, 1824. In Syncarpa and Dendrodoa, a single gonad is situated on the right side of the body, which is unique among Styelidae, and thus can be a synapomorphy for this clade.
Rights: https://creativecommons.org/licenses/by/4.0/
Type: article
URI: http://hdl.handle.net/2115/75081
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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