Morphology and phylogenetic analysis of two new deep-sea species of Chrysogorgia (Cnidaria, Octocorallia, Chrysogorgiidae) from Kocebu Guyot (Magellan seamounts) in the Pacific Ocean

By

Xu, Yu
Li, Yang
Zhan, Zifeng
Xu, Kuidong

Type

Article

Date of Publication

2019

Original Publication

ZooKeys

Volume

881

Pages

91--107

Subjects

Anthozoa , Chrysogorgia binata sp. nov , Chrysogorgia ramificans sp. nov , gorgonian , Phylogeny , taxonomy

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.881.34759

 

Abstract

Two new species ofChrysogorgiaDuchassaing & Michelotti, 1864 collected from Kocebu Guyot in the Magellan seamounts of the Pacific Ocean are described and illustrated:Chrysogorgia ramificanssp. nov.collected from a depth of 1831 m andChrysogorgia binatasp. nov.collected from a depth of 1669 m.Chrysogorgia ramificanssp. nov.belongs to theChrysogorgia“group A, Spiculosae” with rods distributed in body wall and tentacles, andC. binatasp. nov.belongs to the “group C, Squamosae typicae” with rods and/or spindles not present but only scales.Chrysogorgia ramificanssp. nov.differs from congeners by its main stem with 2/5R branching sequence at the bottom forming two large bottlebrush-shaped branches with 1/3R branching sequence at the top.Chrysogorgia binatasp. nov.is similar toC. scintillansBayer & Stefani, 1988, but differs by its larger polyps, larger sclerites in the body wall, and different scales in the upper part of polyps. The mtMutS genetic distances betweenC. ramificanssp. nov.andC. binatasp. nov.and congeners are in the range of 0.33%–2.28% and 0.33%–2.94%, respectively, while the intraspecific distances are in the range of 0–0.16%. Molecular phylogenetic analysis indicates thatC. ramificanssp. nov.is clustered withC. monticolaCairns, 2007 andC. binatasp. nov.is clustered withC. chryseisBayer & Stefani, 1988, both with high support indicating close relationships.