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SPERMATOPHORE AND SPERMATOZOAL MORPHOLOGY IN THE PORCELLANIDAE. II. THE GENERA PETROLISTHES AND POLYONYX (DECAPODA: ANOMURA)

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ABSTRACT The porcellanid genera Petrolisthes and Polyonyx are shown to have differing spermatozoal morphology reflecting an apparently natural division of the family previously suggested on adult and larval somatic morphology. Species investigated in the genus Petrolisthes have spermatozoa with a globular nucleus and autapomorphic opercular ridge and tubular ring structure within the acrosomal vesicle. Spermatozoa of Polyonyx transversus (Haswell) have a long "taillike" nucleus penetrated throughout by a central microtubular core. This latter spermatozoal morphology is shared with other members investigated in the "Porcellana-group," (Aliaporcellanaand Pisidia). All the Porcellanidae investigated share a suite of spermatozoal characters that unite them (superior acrosomal vesicle; broad, centrally perforate operculum; 4 or more external microtubular arms; perforatorial chamber wall folded into corrugations or septa; dense perforatorial cone; posterior perforatorial ring and divided inner acrosome zone). A unique spermatophore morphology, consisting of a tubular extension of the anterior end of the ampulla, is described for representatives in the genus Petrolisthes.

10.1163/193724096X00568
/content/journals/10.1163/193724096x00568
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/content/journals/10.1163/193724096x00568
2017-11-17

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