The sex change of the caridean shrimp Hippolyte inermis Leach: temporal development of the gonopore morphology

Zoomorphology
Mirko MutalipassiValerio Zupo

Abstract

Sex reversal is a process observed in several marine organisms, including some lineages of caridean shrimps. We investigated the gonopore shape and size, to study the sex reversal using Hippolyte inermis as a model. A method was developed which can be applied to identify the sex in juveniles of H. inermis, especially, useful when the standard method of sex assessment is not applicable. The position and the shape of gonopores was recorded under a light macroscope. The sex of mature individuals was then determined by observing the presence/absence of the appendix masculina. In addition, analysis of ontogenetic changes of gonopores were performed to compare their morphology with other species of shrimps whose gonopore morphology was previously known. Female gonopores are located at the far proximo-medial end of the third pair of pereiopod coxae and distally they bear cup-shaped structures, whilst male gonopores are located at the far proximo-medial end of the fifth pair of pereiopod coxae and they have a simpler structure. The shape and structure of gonopores in H. inermis resembled that of other caridean decapods. Intersex individuals were never observed, although this species was demonstrated to be protandric. This observation c...Continue Reading

References

Nov 9, 2006·Evolution; International Journal of Organic Evolution·J Antonio Baeza
Nov 14, 2007·Journal of Clinical Epidemiology·George F BormWim A J G Lemmens
Jun 18, 2011·Zoology : Analysis of Complex Systems, ZACS·M Eugenia Manjón-CabezaJosé Enrique García Raso

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BETA
light microscopy

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