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SECONDARY SEXUAL CHARACTERISTICS OF FEMALES OF THE FRESHWATER CRAYFISH GENUS ENGAEUS (DECAPODA, PARASTACIDAE) BY P. HORWITZ Inland Fisheries Commission, 127 Davey Street, Hobart, 7000, Tasmania,Australia RÉSUMÉ La femelle de l'écrevissue du genre Engaeus peut être reconnue soit comme activement reproductrice, soit comme non reproductrice, d'après la présence ou l'absence de caractères sex- uels secondaires. Ces caractères comprennent un lobe distinct sur le second somite abdominal, une largeur accrue, et une calcification moindre des somites abdominaux et des appendices de l'éventail caudal, ainsi qu'une altération du gonopore femelle. L'auteur propose des explications des fonctions et de l'évolution de ces caractères et en discute les implications en ce qui concerne la phylogénie des Parastacidae. INTRODUCTION Secondary sexual characteristics of males of the northern hemisphere group of freshwater crayfish belonging to the family Cambaridae have long been documented (Faxon, 1883; Crocker & Barr, 1968; Hobbs, 1974), with in- dividuals cycling from a reproductive ("Form I") to a non-reproductive condi- tion ("Form II"). These forms are recognised by functional changes in the pleopods on the first somite of the abdomen, and by modifications to the hooks on the ischia of the second, third or fourth pair of pereiopods. Similarly, females of at
Crustaceana – Brill
Published: Jan 1, 1988
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