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Peniculus hokutoae
Peniculus hokutoae attached to its host
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Copepoda
Order:	Siphonostomatoida
Family:	Pennellidae
Genus:	Peniculus
Species:	P. hokutoae
Binomial name
Peniculus hokutoae Ohtsuka, Nishikawa & Boxshall, 2018

Peniculus hokutoae is a species of parasitic pennellid copepod. It was described in 2018 from a single female. The type-host is the myctophid fish Symbolophorus evermanni and the type-locality is off Japan. The Japanese name of this species is hokuto-kozutsu-hijikimushi.

According to Ohtsuka, Nishikawa & Boxshall, this species is the first record of parasitism by the genus Peniculus on a mesopelagic myctophid fish.

The species was distinguished from other congeners by (1) the presence of a conical process anterior to the rostrum; (2) the secondary elongation of the first pedigerous somite; (3) the incorporation of the third and fourth pedigerous somites into the trunk; (4) the unilobate maxillule bearing two unequal apical setae; (5) the lack of any processes on the first segment of the maxilla.

References

1. Walter TC, Boxshall G, eds. (2021). "Peniculus hokutoae Ohtsuka, Nishikawa & Boxshall, 2018". World of Copepods database. World Register of Marine Species. Retrieved 27 August 2021.
2. ^ Ohtsuka, Susumu; Nishikawa, Jun & Boxshall, Geoffrey A. (2018). "A new species of Peniculus (Copepoda: Siphonostomatoida) parasitizing mesopelagic myctophid fish: first discovery of colonization of the genus in deep water". Parasite. 25: 58. doi:10.1051/parasite/2018057. PMC 6254144. PMID 30474599.

• Siphonostomatoida
• Crustaceans of the Pacific Ocean
• Animal parasites of fish
• Crustaceans described in 2018