We describe the male reproductive apparatus of the giant hermit crab Petrochirus diogenes, with morphological and biometric analyses of the spermatophore, the gonopore and the ultrastructure of the spermatozoa. Specimens ...

Intersexuality in a gonochoric palaemonid shrimp is reported for the first time in a wild population of Macrobrachium amazonicum (Heller, 1862). This phenomenon was confirmed based on an investigation of anatomic and ...

The spermatophore morphology of the hermit crab Isocheles sawayai from Southwestern Atlantic (Brazil) is described. The spermatophores show similarities with those described for other members of the family Diogenidae, ...

The reproductive system of hermit crabs shows species-specific morphology, which can be used in phylogenetic analysis. Here, we describe the male reproductive system of the hermit crab Dardanus insignis, including morphological ...

Functional morphology of Libinia spinosa male gonopods, female holding systems and gonopores were described through scanning electron microscopy and histological sections, establishing differences between immature and ...

Callichirus seilacheri (Bott, 1955) is considered one of the most common ghost shrimps in the intertidal zone of sandy beaches along the eastern tropical Pacific. The present study provides new observations on the morphology ...

Callichirus seilacheri (Bott, 1955) is considered one of the most common ghost shrimps in the intertidal zone of sandy beaches along the eastern tropical Pacific. The present study provides new observations on the morphology ...

Larval genital discs are sexually dimorphic in many social wasps (Hymenoptera: Vespidae). These sexual traits are visible in vivo and in long-term ethanol-preserved samples. Genital disc morphology provides a cheap, quick, ...