Document of bibliographic reference 314095

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Molecular systematics and morphological analyses of the subgenus Setihenricia (Echinodermata: Asteroidea: Henricia) from Japan

Abstract

The subgenus Setihenricia Chichvarkhin and Chichvarkhina, 2017 currently consists of 32 out of 94 species of sea stars in the genus Henricia Gray, 1840. However, only 10 have been molecularly ascertained as to the phylogenetic position. Based on seven mitochondrial gene markers (16S rRNA, COI, tRNA-Ala, tRNA-Leu, tRNA-Asn, tRNA-Gln, and tRNA-Pro), we performed molecular analyses to assess the monophyly of Setihenricia using 16 species of Henricia from Japanese waters, as well as other congeners for which sequences were available in public databases. The monophyletic Setihenricia was only weakly recovered because the support values were low, but we assume this taxon may be valid in consideration of a morphological key. Henricia kinkasana Hayashi, 1940 is herein identified as a new member of Setihenricia, based on molecular and morphological evidence. Sequences in the public databases previously identified as H. compacta (Sladen, 1889) and H. obesa (Sladen, 1889) were nested in the Setihenricia clade; these two species are also likely members of Setihenricia. Our morphological assessment yielded three findings: (1) the number of the rows of spines on each inferomarginal plate, being three or more, appears to be a useful diagnostic character for Setihenricia, as has been suggested in previous studies, (2) the degree of spine tapering turned out to be less relevant in diagnosing the subgenus than previously supposed, (3) two newly introduced characters—(i) the width of adambulacral plates and (ii) the ratio of two measurements in ambulacral plates to the length of interradius—may be effective to distinguish members of this apparent Henricia subclade from other members of the genus.

Bibliographic citation

Wakita, D.; Fujita, T.; Kajihara, H. (2019). Molecular systematics and morphological analyses of the subgenus Setihenricia (Echinodermata: Asteroidea: Henricia) from Japan. Species Divers. 24(2): 119-135. https://dx.doi.org/10.12782/specdiv.24.119

Is peer reviewed

true

Access rights

open access

Is accessible for free

true