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1 May 2002 GEOGRAPHIC VARIATION IN CRANIAL MORPHOLOGY IN THRICHOMYS APEREOIDES (RODENTIA: ECHIMYIDAE). II. GEOGRAPHIC UNITS, MORPHOLOGICAL DISCONTINUITIES, AND SAMPLING GAPS
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Abstract

Geographic variation in cranial shape was examined in 20 samples of the echimyid rodent Thrichomys apereoides from northeastern, central, and southeastern Brazil. Canonical variate analysis and a dendrogram based on geometric shape descriptors revealed 2 groups of populations diagnosable by features of cranial shape and geographic continuity. The observed morphological discontinuity between the 2 groups of populations corresponds with a gap in sampling of T. apereoides, as represented by the museum series used. A positive, significant relationship between morphological and geographic distances was found among populations within each of the 2 groups but not between populations in the 2 groups. The indirect, statistical approach suggests that discontinuity in cranial shape in T. apereoides results from historical processes of differentiation rather than from an artifact caused by a gap in the available samples.

Sérgio F. dos Reis, Luiza C. Duarte, Leandro R. Monteiro, and Fernando J. Von Zuben "GEOGRAPHIC VARIATION IN CRANIAL MORPHOLOGY IN THRICHOMYS APEREOIDES (RODENTIA: ECHIMYIDAE). II. GEOGRAPHIC UNITS, MORPHOLOGICAL DISCONTINUITIES, AND SAMPLING GAPS," Journal of Mammalogy 83(2), 345-353, (1 May 2002). https://doi.org/10.1644/1545-1542(2002)083<0345:GVICMI>2.0.CO;2
Accepted: 29 August 2001; Published: 1 May 2002
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