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A new genus for Fabia obtusidentata Dai, Feng, Song and Chen, 1980, a pea crab (Decapoda: Brachyura: Pinnotheridae) symbiotic with the moon scallop Amusium pleuronectes (Linnaeus, 1758) (Mollusca: Pectinidae)

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The western Pacific pinnotherid crab, Fabia obtusidentata Dai, Feng, Song and Chen, 1980, which lives in the saucer scallop, Amusium (Pectinidae), is found not to belong to Fabia Dana, 1851 s. str. or Pinnotheres Bosc, 1802. In contrast to these two genera, F. obtusidentata possesses a carapace not having longitudinal grooves, a third maxilliped in which the dactylus is slender and inserted one-third from the proximal end of the conical propodus, and a prominently elongated right third ambulatory leg with a long dactylus. It is here referred to its own genus, Amusiotheres gen. nov. Pinnotheres hanumantharaoi Devi and Shyamasundari, 1989, from India, is also transferred to the new genus.

Affiliations: 1: 1Lee Kong Chian Natural History Museum, Faculty of Science, National University of Singapore, 2 Conservatory Drive, Singapore 117377, Republic of Singapore ; 2: 2Department of Environment Biology and Fishery Science, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung 202, Taiwan

*Corresponding author; e-mail:

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