Vol. 60, 2021
(update: 2021.07.08; 10.01)
Infestation by Rhizocephalan Barnacle Parasites in the Spider Crab Pugettia aff. ferox Ohtsuchi & Kawamura, 2019
from Peter the Great Bay (Northwestern Sea of Japan)
D. Golubinskaya1,*, Olga
M. Korn1, Svetlana
Zhirmunsky National Scientific Center of Marine Biology, Far Eastern
Branch, Russian Academy of Sciences, Vladivostok 690041, Russia.
*Correspondence: E-mail: email@example.com (Golubinskaya).
E-mail: firstname.lastname@example.org (Korn); email@example.com (Sharina);
Received 12 January 2021 / Accepted 23
Communicated by Benny K.K. Chan
Sympatric two-species infestation
by rhizocephalan parasites in the spider crab Pugettia aff. ferox
Ohtsuchi & Kawamura, 2019 (Brachyura: Epialtidae) was investigated
in the Vostok Bay (Peter the Great Bay, northwestern Sea of Japan).
Morphological and molecular analyses showed that this crab was infested
simultaneously by Sacculina pugettiae Shiino, 1943 and Parasacculina pilosella (Van Kampen
et Boschma, 1925) (Cirripedia: Rhizocephala). Sacculina pugettiae
was found in the northwestern Sea of Japan for the first time. The two
rhizocephalan species are clearly distinguishable by the morphology of
their external cuticles, the shape and position of their receptacles,
and the structure of their colleteric glands. Retinacula are present in
the mature externae of both species. Molecular analysis showed that
these rhizocephalans are unrelated, although both species parasitize Pugettia aff. ferox and are sympatric. Sacculina pilosella should be
placed in the genus Parasacculina
Høeg & Glenner, 2019, belonging to the family Polyascidae Høeg & Glenner,
2019. The intensity of infestation reached two externae in P. pilosella and three externa in S. pugettiae
per host. A simultaneous settlement of two rhizocephalans on the same
crab specimen was shown for the first time. The intensity of the
two-species multiple infestations reached four externae per host.
Externae with developing embryos occurred from June to September in P. pilosella and July to September
in S. pugettiae,
at water temperatures of 15–24ºC, indicating that the reproductive
periods of these species are confined to the summer months in the
Key words: Rhizocephala, Parasacculina pilosella, Sacculina pugettiae, Morphology,
Golubinskaya DD, Korn OM, Sharina SN, Selin NI. 2021. Sympatric
two-species infestation by rhizocephalan barnacle parasites in the
spider crab Pugettia aff. ferox Ohtsuchi & Kawamura, 2019
from Peter the Great Bay (northwestern Sea of Japan). Zool Stud 60:54. doi:10.6620/ZS.2021.60-54.
Materials: Fig. S1〡Fig. S2〡Table S1〡Table S2