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MORPHOMETRY, REPRODUCTIVE BIOLOGY, AND DIET OF ACANTHOCARPUS ALEXANDRI STIMPSON, 1871 (DECAPODA, BRACHYURA) IN THE MIDDLE ATLANTIC BIGHT

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ABSTRACT Morphometry, reproductive biology, and diet of Acanthocarpus alexandri (Brachyura, Calappidae), captured on the eastern continental shelf of North America, are described. Carapace width was significantly longer than carapace length for the size range (CW: 6–44 mm) examined. Of the nine morphometric relationships observed, five dimensions exhibited allometric growth: width of propodus for male chelipeds, length of ischio-merus for female chelipeds, length of inferior meral spine for chelipeds of both sexes, width of the abdomen, and length of vulvae for females. Sexual dimorphism was demonstrated for body depth, abdominal width, and length of inferior spine of the chelipeds. Pubertal molts for females in the 18-24 mm range of carapace width were inferred from changes in allometry of vulval length and abdominal width. These alterations were correlated with gonad development and pleopod setation. Examination of testes and vasa deferentia indicated that males mature within a comparable size range. Acanthocarpus alexandri is an opportunistic carnivore and scavenger, feeding on a variety of benthic infauna.

Affiliations: 1: Department of Biology, Rochester Institute of Technology, Rochester, New York 14623.

10.1163/1937240X81X00438
/content/journals/10.1163/1937240x81x00438
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/content/journals/10.1163/1937240x81x00438
2017-09-26

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