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Étude morphologique d'une crevette endémique des cours d'eau du Sud Tunisien, Palaemonetes mesogenitor Sollaud, 1912 (Decapoda, Caridea, Palaemonidae) (Morphological Study of a Shrimp Endemic in Southern Tunesian Water Courses, Palaemonetes mesogenitor Sollaud, 1912 (Decapoda, Caridea, Palaemonidae))

Atf Azzouna
Crustaceana
Vol. 67, No. 3 (Nov., 1994), pp. 267-283
Published by: Brill
Stable URL: http://www.jstor.org/stable/20104990
Page Count: 17
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Étude morphologique d'une crevette endémique des cours d'eau du Sud Tunisien, Palaemonetes mesogenitor Sollaud, 1912 (Decapoda, Caridea, Palaemonidae) (Morphological Study of a Shrimp Endemic in Southern Tunesian Water Courses, Palaemonetes mesogenitor Sollaud, 1912 (Decapoda, Caridea, Palaemonidae))
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Abstract

The species here under study, Palaemonetes mesogenitor, has previously been linked to the P. varians group. However, four clearly defined differences with the P. varians group have subsequently been established. These comprise: (1) the endopodite and the exopodite of the male pleopod I are approximately of the same length; (2) the male pleopod II has an appendix masculina which is clearly longer than the endopodite; (3) the first maxilliped has an epipodite with only a slight indentation between its branches, contrary to the usual conditions in bilobed epipodites; (4) the caudalmost rim of the telson bears four to six plumose setae. The morphology of P. mesogenitor is described in detail herein. /// L'espèce étudiée, Palaemonetes mesogenitor, a été rattachée d'abord au groupe de P. varians. Cependant une analyse morphologique a établi quatre différences très nettes avec le groupe P. varians. Ces différences sont: (1) l'endopodite et l'exopodite du pléopode I mâle sont à peu près de même longueur; (2) le pléopode II mâle a un appendix masculina nettement plus long que l'endopodite; (3) le premier maxillipède a un épipodite faiblement échancré, contrairement au type habituel à épipodite bilobé; (4) le bord postérieur du telson porte quatre à six soies plumeuses. La morphologie détaillée de P. mesogenitor est décrite ici.

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