López-Antoñanzas Raquel
Departamento de Paleobiología, Museo nacional de Ciencias naturales-CSIC, C/ José Gutiérrez Abascal 2, 28006 Madrid, Spain.
Zookeys. 2012(228):69-75. doi: 10.3897/zookeys.228.3826. Epub 2012 Oct 17.
Cannomys and Rhizomys are the sole living genera of the tribe Rhizomyini (Rhizomyinae, Spalacidae, Rodentia), known in the fossil record since the Late Miocene. The dental morphology of fossil Rhizomyini has been described in detail but until recently such descriptions were unavailable for extant species. A detailed account of the morphology and dental wear pattern of the cheek teeth of Cannomys badius is provided here based on the examination of museum specimens. Three stages of wear are recognized. Cannomys shares with Rhizomys the synapomorphy of having a mesolophid that is a long continuation of the protoconid on the first lower molar. There are significant differences between these taxa, such as the much smaller size of the cheek teeth and the trilophodont dental pattern of the M2, M3, and m2 in Cannomys.
板齿鼠属（Cannomys）和竹鼠属（Rhizomys）是竹鼠族（Rhizomyini，竹鼠亚科，竹鼠科，啮齿目）仅存的两个属，自中新世晚期以来在化石记录中便有记载。化石竹鼠族的牙齿形态已被详细描述，但直到最近，现存物种的此类描述仍未可得。本文基于对博物馆标本的检查，提供了对板齿鼠（Cannomys badius）颊齿形态和牙齿磨损模式的详细描述。识别出三个磨损阶段。板齿鼠属与竹鼠属共有一个近裔共性，即下第一臼齿上的下中嵴是原尖的长延续。这些类群之间存在显著差异，例如颊齿尺寸小得多，以及板齿鼠属中M2、M3和m2的三嵴齿模式。
