The Calanoid Copepod Euchaeta Antarctica from Southern Ocean Atlantic Sector Midwater Trawls, with Observations on Spermatophore Dimorphism

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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.