What is it about?
This study used geometric morphometrics to examine cranial variation in six species of Eligmodontia from South America. I analyzed 71 skull landmarks from 151 adult specimens collected from 54 localities and tested how species differences, body size, phylogeny, geography, climate, habitat, substrate, and diet relate to cranial shape.
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Why is it important?
Skull shape distinguished nearly all species pairs, showing that cranial morphology can be useful for taxonomy in this group. Much of the variation was associated with allometry, while climate, geography, and other ecological factors also contributed. The results show that developmental scaling and environmental pressures jointly shape cranial diversification in these desert rodents.
Perspectives
I was particularly interested in separating the effects of size, shared ancestry, and environment rather than treating cranial differences as the result of a single process. Eligmodontia provides a useful system for doing this because closely related species occupy geographically and climatically contrasting parts of arid South America.
Bader H. Alhajeri
Kuwait University
Read the Original
This page is a summary of: Allometry and ecology shape cranial variation in phyllotine gerbil mice (Eligmodontia), Zoologischer Anzeiger, January 2026, Elsevier,
DOI: 10.1016/j.jcz.2026.01.001.
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