ArticlePeerJ2026
Gastric morphology in sigmodontine rodents (Mammalia: Cricetidae): a comprehensive comparative classification.
Article in PeerJ, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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10 authors.
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Abstract
Sigmodontine rodents (Cricetidae: Sigmodontinae) represent the most diverse extant mammalian subfamily in both generic and species richness. Variation in conservative organ systems, such as the stomach, can provide insight into the morphological basis of their ecological diversification. Here, we examined the gross internal anatomy of 602 stomachs representing 168 species, 74 genera, and 13 tribes-approximately 80% of the subfamily's generic diversity-using sagittal and transverse sections. We propose a refined and standardized classification of stomach morphology based on the distribution of glandular and cornified epithelia. Five principal gastric designs are recognized: equiglandular, supraglandular, subglandular, discoglandular, and diverticular. The equiglandular condition predominates, occurring in approximately 65% of genera. Most tribes are characterized by a single gastric design, whereas Akodontini and Thomasomyini each exhibit multiple configurations. Notable exceptions include
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