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| Mycetomorpha abyssalis sp. nov., holotype, fresh specimen. Mycetomorpha abyssalis sp. nov., holotype, attached to the host, Sclerocrangon zenkevitchi Birshtein & Vinogradov, 1953, fresh specimen. Scale bar: 10 mm. Kakui, 2024 |
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).
Key Words: Caridea, deep sea, integrative taxonomy, mesoparasite, parasite, turbo taxonomy
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| Mycetomorpha abyssalis sp. nov., holotype, attached to the host, Sclerocrangon zenkevitchi Birshtein & Vinogradov, 1953, fresh specimen. Scale bar: 10 mm. |
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| Mycetomorpha abyssalis sp. nov., holotype, fresh specimen. A. Habitus, parasitic on the host, ventral view; B, C. Habitus, ventral (B) and dorsal (C) views; ant – anterior; lef – left; man – mantle opening; rig – right; pos – posterior; sta – stalk; tub – tubular lobe. Scale bars: 10 mm. Mycetomorpha abyssalis sp. nov., holotype, attached to the host, Sclerocrangon zenkevitchi Birshtein & Vinogradov, 1953, fresh specimen. Scale bar: 10 mm. |
Family Mycetomorphidae Høeg & Rybakov, 1992
Genus Mycetomorpha Potts, 1912
Mycetomorpha abyssalis sp. nov.
New Japanese name: メイフノミノフクロムシ
(Meifu-no-mino-fukuromushi)
Etymology: The specific name abyssalis (Latin: abyssal) is an adjective referring to the collection of this species from an abyssal depth.
Type host: Sclerocrangon zenkevitchi Birshtein & Vinogradov, 1953 (Decapoda: Caridea: Crangonidae).
Keiichi Kakui. 2024. A New parasitic Barnacle (Crustacea, Cirripedia, Rhizocephala, Mycetomorpha) from the Abyssal Zone in the northwestern Pacific. Zoosystematics and Evolution. 100(2): 385-390. DOI: 10.3897/zse.100.120887
