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Intersex Specimens of the Amphipod Ampelisca Brevicornis (Costa)

Intersex Specimens of the Amphipod Ampelisca Brevicornis (Costa) INTERSEX SPECIMENS OF THE AMPHIPOD AMPELISCA BREVICORNIS (COSTA) BY M. H. HASTINGS Department of Marine Biology, University of Liverpool, Port Erin, Isle of Man, U.K. INTRODUCTION During a study of the life cycle and reproductive biology of the amphipod Ampelisca brevicornis (Costa, 1853) at Derbyhaven, Isle of Man (Hastings, 1980), several adult individuals were collected in the summer of 1979 which could not be assigned to either sex. The male of the species can normally be identified before it attains breeding condition by the presence of paired genital papillae on the sternum of the seventh peraeon somite (Mills, 1963). Similarly females above 8.0 mm body length are readily identified by the presence of oostegites and the absence of papillae. However, several individuals were collected from Derbyhaven which bore both papillae and short, non-setose oostegites. The presence of such intersex animals would appear to be a com- mon feature of several ampeliscid populations and has caused confusion in at- tempts to classify the genus satisfactorily. Reid (1951) and Sanders (1956) have reported intersexes for other ampeliscids, although Mills (1963) showed that `gynomorphic' males of A. vadorum Mills, 1963, were normal, immature males. In the light of these reports, a http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crustaceana Brill

Intersex Specimens of the Amphipod Ampelisca Brevicornis (Costa)

Hastings, M.H.
Crustaceana , Volume 41 (2): 199 – Jan 1, 1981
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References (6)

Publisher
Brill
Copyright
© 1981 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0011-216x
eISSN
1568-5403
DOI
10.1163/156854081X00246
Publisher site
See Article on Publisher Site

Abstract

INTERSEX SPECIMENS OF THE AMPHIPOD AMPELISCA BREVICORNIS (COSTA) BY M. H. HASTINGS Department of Marine Biology, University of Liverpool, Port Erin, Isle of Man, U.K. INTRODUCTION During a study of the life cycle and reproductive biology of the amphipod Ampelisca brevicornis (Costa, 1853) at Derbyhaven, Isle of Man (Hastings, 1980), several adult individuals were collected in the summer of 1979 which could not be assigned to either sex. The male of the species can normally be identified before it attains breeding condition by the presence of paired genital papillae on the sternum of the seventh peraeon somite (Mills, 1963). Similarly females above 8.0 mm body length are readily identified by the presence of oostegites and the absence of papillae. However, several individuals were collected from Derbyhaven which bore both papillae and short, non-setose oostegites. The presence of such intersex animals would appear to be a com- mon feature of several ampeliscid populations and has caused confusion in at- tempts to classify the genus satisfactorily. Reid (1951) and Sanders (1956) have reported intersexes for other ampeliscids, although Mills (1963) showed that `gynomorphic' males of A. vadorum Mills, 1963, were normal, immature males. In the light of these reports, a

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Crustaceana – Brill

Published: Jan 1, 1981

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