

FOLLOWUS
1.Laboratory of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
Shuqian ZHANG, E-mail: zsqtaxon@qdio.ac.cn
Suping ZHANG, E-mail: museum@qdio.ac.cn
Received:23 October 2020,
Accepted:18 December 2020,
Online First:07 February 2021,
Published:2021-09
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Shuqian ZHANG, Suping ZHANG.
Shuqian ZHANG, Suping ZHANG.
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 970-1 262 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 with 17-19 pairs of secondary gills; anus located below the 5
th
and 6
th
secondary gills
and the genitalia below the 3
rd
secondary gill on the right side of the body. Based on these external features
T. iocasica
sp. nov. can be clearly distinguished from all previously described members of the genus. Phylogenetic analyses of two mitochondrial (COI
16S 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.
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