Eutamias Trouessart 1880

Eutamias Trouessart, 1880

Diagnosis Dorsal stripes all subequally spaced; lateral pair of dark stripes shorter than median trio, which reach onto shoulder and rump; antorbital foramen suborbicular; ears broad, rounded at the tips; tail 40–50% total length; posterior border of the zygomatic notch extends only to level of P4; postorbital process broad basally; well-developed lambdoidal crest; palate short, extending to or just behind the plane of the last molars; auditory bullae relatively large; upper incisors with numerous distinct longitudinal striations; normally two upper premolars, the anterior root of P4 projects lingual to the masseteric knob; upper molar series slightly convergent posteriorly; head of the malleus not elongated, the planes formed by the lamina and manubrium ca. 90°; hypohyal and ceratohyal elements of hyoid apparatus completely fused in adults; conjoining tendon between anterior and posterior sets of digastric muscles ribbonlike; baculum gradually tapering from base to tip, evenly curved at tip, with a microscopic ridge on the dorsal surface. Karyotype 2N=38, with two to three autosomal and one Y chromosome rearrangement separating it from either of the North American lineages (Nadler et al. 1977).

Type species Sciurus striatus asiaticus Gmelin, 1788.

Included species Eutamias sibiricus (Laxmann, 1769) – Siberian chipmunk.