Journal of Morphology

Nicrophorus clypeal membranes exaggerate body size, sometimes more noticeably in males.

Unlike all other anurans, the vocal sac wall of hylodids projects through submandibular musculature. We report three synapomorphies for Hylodidae and a mechanism for unilateral inflation of paired vocal sacs, only observed in these frogs.

A mineralized structure, composed of amorphous calcium phosphates and never reported in vertebrates, was found in the notochord of Acipenser baerii from 2 years onwards. We describe this enigmatic tissue using CT-scan, histological analyses and solid state NMR spectroscopy

The groove was formed by two nonpapillated ridges (R). These ridges divided the lumen of the ascending colon into two compartments: the groove lumen (G) and the large main lumen (MLu). The histochemical analysis revealed significant differences among goblet cells in and out of the colonic groove, being this the first time an abrupt change in the glycosylation pattern of the intestinal tract of L. maximus is described (see dotted lines).

Different selective pressures over males with alternative mating tactics may lead to intraspecific diversity in ejaculates, for example, sneakers sperm aggregation, possibly related to avoiding dilution and slowing spermatozoa release until fertilization.