Document of bibliographic reference 312463

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

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

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 composite (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: Ul’banskij Bay, Russia). Specimens of S. composita consistently differed from the syntype of S. oviformis 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 clade 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.

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000472671300001

Bibliographic citation

Hasegawa, N.; Kajihara, H. (2019). A redescription of Syncarpa composita (Ascidiacea, Stolidobranchia) with an inference of its phylogenetic position within Styelidae. ZooKeys 857: 1-15. https://dx.doi.org/10.3897/zookeys.857.32654

Topic

Marine

Is peer reviewed

true

Access rights

open access

Is accessible for free

true