A new parasitic barnacle (Crustacea, Cirripedia, Rhizocephala, Mycetomorpha) from the abyssal zone in the northwestern Pacific

By

Kakui, Keiichi

Type

Article

Date of Publication

2024

Original Publication

Zoosystematics and evolution

Volume

100

Pages

385--390

Subjects

Caridea , deep sea , integrative taxonomy , mesoparasite , parasite , turbo taxonomy

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia Pensoft

Identifiers

DOI: https://doi.org/10.3897/zse.100.120887

 

Abstract

I describe the parasitic barnacle Mycetomorpha abyssalis sp. nov. from the crangonid shrimp Sclerocrangon zenkevitchi collected from 3893–3890 m depth off the eastern coast of Iwate, Japan, northwestern Pacific. This is the first Mycetomorpha rhizocephalan from the abyssal zone and the third species in Mycetomorpha. Mycetomorpha abyssalis sp. nov. differs from its congeners M. vancouverensis and M. albatrossi in (1) triangular shield lacking, (2) stalk one-quarter of length from posterior end of externa, (3) mantle opening clearly anterior to stalk, (4) different host genus, and (5) depth range much deeper. I determined partial sequences for the mitochondrial cytochrome c oxidase subunit I (COI) and 16S rRNA genes and nuclear 18S rRNA and 28S rRNA genes from M. abyssalis sp. nov. for future DNA barcoding and phylogeny. Kimura 2-parameter distances between M. abyssalis sp. nov. and M. vancouverensis were 21.2% (16S), 0.6% (18S), and 1.5% (28S).