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A lock-on system in precopulae of Dikerogammarus villosus (Sowinsky, 1894), also present in Gammarus pulex pulex (Linnaeus, 1758) (Amphipoda). Amphipod Pilot Species Project (AMPIS) Report 2

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In Dikerogammarus villosus and Gammarus p. pulex, a lock-on mechanism for amplexus was found. Large pores on the first and fifth female pereionites are involved, as well as the first pair of male gnathopods. On the anterior edge of pereionite 1 and the posterior edge of pereionite 5, specialized areas were found that allow penetration of the male's dactyli in the inter-segmental spaces of the female. Also, a guidance system for male attachment to the female was found using palmar spines of the first pair of gnathopods. The mechanism is described and discussed. Morphometric analysis of this lock-on system explains the strong size-relationship between partners. Chez Dikerogammarus villosus et Gammarus pulex, un mécanisme de verrouillage lors de la précopulation a été mis en évidence. Des pores de grande taille situés sur les premiers et cinquièmes péréionites de la femelle sont impliqués, ainsi que la première paire de gnathopodes mâles. Sur le bord antérieur du premier péréionite, et le bord postérieur du cinquième péréionite, des aires spécialisées ont été observées, qui permettent la pénétration des dactyles du mâle dans les espaces inter-segmentaires de la femelle. De même, un système de guidage pour l'attachement du mâle à la femelle a été trouvé, utilisant les épines palmaires de la première paire de gnathopodes. Le mécanisme est décrit et discuté. L'analyse morphométrique de ce système de verrouillage explique la forte relation liée à la taille entre partenaires.

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