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Tonkinomys daovantieni
Taxonomy
Tonkinomys daovantieni was named by Musser et al. (2006). It is extant. Its type specimen is AMNH 275618, a skeleton. Its type locality is Lan Ðat Village, which is in a Holocene terrestrial horizon in Vietnam. It is the type species of Tonkinomys.
Synonymy list
| Year | Name and author |
|---|---|
| 2006 | Tonkinomys daovantieni Musser et al. p. 6 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Tonkinomys daovantieni Musser et al. 2006
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. G. Musser et al. 2006 | A genus of Muridae in the
Dacnomys Division (Musser and Carleton, 2005) of the subfamily Murinae (as delimited by Carleton and Musser, 1984) that is set apart from all other described murid genera by the following combination of morphological traits: (1) fur covering head and body semi- spinous and grayish black, spattered with a white blaze on forehead in most individuals, underparts dark gray with white patch on the chest, ears gray, rhinarium and lips and chin unpigmented; (2) mystacial and superciliary vibrissae very long; (3) dorsal surfaces of front feet white, hind feet white with brown hairs on metatarsal region; (4) tail much shorter than length of head and body, thick and round in cross-section and well-haired, the proximal one-half to three-fourths of its dorsal and lateral surfaces dark brown, the distal one- fourth to one-half white (unpigmented); (5) palmar and plantar pads large, swollen, and set close together; (6) four pairs of teats; (7) robust skull with moderately long and wide rostrum, prominent postorbital and temporal ridges, sturdy zygomatic arches, and deep occiput; (8) squamosal root of each zygomatic arch situated high on side of cranium where its posterior ridge-like portion runs horizontally just below posteroventral margin of the parietal and projects ventrad to form dorso- lateral side of cranium; (9) lateral cranial wall intact anterior to occiput, without large subsquamosal foramen; (10) narrow alisphe- noid struts in most specimens; (11) wide and moderately long incisive foramina, their pos- terior borders located just before anterior margins of molar rows, even with them, or penetrating slightly between; (12) posteriorly divergent maxillary molar rows; (13) wide and long bony palate projecting beyond molars to form a wide platform; (14) moderately spacious sphenopalatine vacuities; (15) wide and shallowly excavated pterygoid fossae; (16) small ectotympanic bulla relative to skull size, incompletely covering periotic so that dorsal and slanting posterodorsal wall of carotid canal formed by periotic and not ectotympanic; (17) large foramen for stapedial artery, no sphenofrontal foramen or squamo- soalisphenoid groove, indicating the widespread murine cephalic arterial pattern; (18) coronoid process of dentary small, condyloid and angular processes joined by shallow concave posterior margin of dentary, and alveolar incisor capsule only slightly evident on lateral surface of dentary; (19) upper incisors opisthodont relative to rostrum; (20) first upper molar with four large roots (anterior, two lingual, and posterior), second and third molars each with three roots (anterior, lingual, and posterior); (21) each lower molar with two roots; (22) molars brachydont, with cusp rows form- ing uncomplicated occlusal patterns resembling those in species of Niviventer, Chiromyscus, and Saxatilomys. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Lillegraven 1979, Hendy et al. 2009, Carroll 1988, Nowak 1991, Ji et al. 2002 | |||||