Journal
ZOOTAXA
Volume 4139, Issue 2, Pages 209-220Publisher
MAGNOLIA PRESS
DOI: 10.11646/zootaxa.4139.2.5
Keywords
description; new species; parasitic barnacle; hermit crab; Bonin Islands
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Funding
- Tokyo Metropolitan Ogasawara Island Branch Office
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A new rhizocephalan species, Peltogaster unigibba n. sp., is described from the host hermit crab, Pagurixus boninensis (Melin, 1939), from the Bonin Islands, Japan. Of the 16 known species of Peltogaster now currently recognised, P. unigibba n. sp., and P. contorta Boschma, 1958 share a left lobe that projects beyond the mantle aperture. The two species can be distinguished from one another by the position of the opening of the mantle aperture. The new species most closely resembles P. naushonensis Reinhard, 1946 in its internal structure, but clearly differs in the relative length of the colleteric glands. Peltogaster unigibba n. sp. represents the first record of a rhizocephalan from the oceanic Bonin Islands, and the second record of a rhizocephalan from an oceanic island in the northern hemisphere.
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