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THE CALANOID COPEPOD EUCHAETA ANTARCTICA FROM SOUTHERN OCEAN ATLANTIC SECTOR MIDWATER TRAWLS, WITH OBSERVATIONS ON SPERMATOPHORE DIMORPHISM

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image of Journal of Crustacean Biology

ABSTRACT Stage V amd VI copepodids of the predatory calanoid copepod Euchaeta antarctica were counted from Southern Ocean Atlantic Sector trawl samples collected during 9 months over a 5-year period. The proportion of CVI males to all CVI animals reached a maximum in June; the proportion of CVI males to total males reached a maximum in July. Two morphologically distinct kinds of spermatophores were attached to 2 different areas on the genital segment of females, and were correlated with 2 kinds of spermatophores held in leg 5 and contained within the bursa of different males. Possible adaptive significance of spermatophore dimorphism and placement for Euchaetidae is discussed and further studies are outlined.

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/content/journals/10.2307/1548295
1987-01-01
2016-12-09

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