Tritonia iocasica sp.nov.,a new tritoniid species from a seamount in the tropical Western Pacific(Heterobranchia:Nudibranchia)  

作　　者：Shuqian ZHANG Suping ZHANG 

机构地区：[1]Laboratory of Marine Organism Taxonomy and Phylogeny,Institute ofOceanology,Chinese Academy of Sciences,Qingdao 266071,China [2]Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao266071,China

出　　处：《Journal of Oceanology and Limnology》2021年第5期1817-1829,共13页海洋湖沼学报（英文）

基　　金：the Science&Technology Basic Resources Investigation Program of China(No.2017FY100804);the Key Program of National Natural Science Foundation of China(No.41930533);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB42000000);the Major Program of National Natural Science Foundation of China(No.42090044);the Senior User Project of R/V Kexue(No.Kexue2020G02)。

摘　　要：During an expedition to a seamount at Caroline Plate in the tropical Western Pacific,a new species of Tritonia was sampled from the upper bathyal zone at depth of 970-1262 m.This new species,Tritonia iocasica sp.nov.,represents the first tritoniid nudibranch known to feed on octocoral of the family Melithaeidae.The species is up to 120 mm in length,pinkish in color;with the rhinophoral sheath divided into several petaliform extensions;veil with,about 18 elongate digitiform processes;notal margin with17-19 pairs of secondary gills;anus located below the 5th and 6th secondary gills,and the genitalia below the 3rd secondary gill on the right side of the body.Based on these external features,T.iocasica sp.nov.can be dearly distinguished from all previously described members of the genus.Phylogenetic analyses of two mitochondrial(COI,16 S rRNA)and a nuclear(H3)genes using Bayesian inference,maximum likelihood,and species delimitation analysis also support the separation of T.iocasica sp.nov.from its congeners.

关 键 词：Tritoniidae Mariana Trench upper bathyal zone Melithaeidae 

分 类 号：Q959[生物学—动物学]