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DISTINGUISHING JUVENILE STAGES OF JONAH AND ATLANTIC ROCK CRABS, CANCER BOREALIS AND C. IRRORATUS (DECAPODA: CANCRIDAE)

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ABSTRACT The Jonah crab Cancer borealis and the Atlantic rock crab C. irroratus occur together in waters of the continental shelf and slope of the northwestern Atlantic Ocean between southeastern Canada and southeastern Florida, U.S.A. Characters that distinguish superficially similar juveniles of these species are presented. At carapace widths less than about 20 mm, juveniles can be distinguished by: (1) edges of the anterolateral teeth and orbital margins, granular in C. irroratus, serrate in C. borealis; (2) shape of the outer orbital tooth, rounded to more or less rectangular and coalesced with adjacent anterolateral tooth in C. irroratus, but with these teeth sharply pointed and well separated in C. borealis; and (3) surface of carapace, relatively smooth in C. irroratus, but granular and setose in C. borealis. Comparative illustrations are given.

Affiliations: 1: (ABW) National Marine Fisheries Service Systematics Laboratory, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560; 2: (RW) Program in Ecology and Evolutionary Biology, Brown University, Box G-W, Providence, Rhode Island 02912, U.S.A.

10.1163/1937240X92X00355
/content/journals/10.1163/1937240x92x00355
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/content/journals/10.1163/1937240x92x00355
2017-12-16

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