Lambdopsalidae Chow and Qi, 1978

Mao, Fang-Yuan, Wang, Yuan-Qing & Meng, Jin, 2016, New specimens of the multituberculate mammal Sphenopsalis from China: Implications for phylogeny and biology of taeniolabidoids, Acta Palaeontologica Polonica 61 (2), pp. 429-454 : 433

publication ID

https://doi.org/ 10.4202/app.00117.2014

persistent identifier

https://treatment.plazi.org/id/03D487E2-A460-FFE6-FC9E-2903FB40FB43

treatment provided by

Felipe

scientific name

Lambdopsalidae Chow and Qi, 1978
status

 

Family Lambdopsalidae Chow and Qi, 1978

Type genus: Lambdopsalis Chow and Qi, 1978 .

Included genera: Sphenopsalis Matthew, Granger, and Simpson, 1928 .

Emended diagnosis.—Differ from other multituberculates, including the North American taeniolabidoids, in having a combination of the following features: tooth formula 2.0.1.2/1.0.1.2; upper incisors anteriorly positioned, simple and pointed, with circular cross-section, and lacking diastema between I2 and I3; long diastema between I3 and P4; M1 cusp formula 7:7:8, M2 cusp formula 1:2:4; occlusal surface of molars, particularly M2/m2 forming a sloped trench with a broad V-shape in distal view; M2 cusps crescentic, with the two medial cusps in the shape of an oblique, strong ridge and nearly twice the width of the lingual ones; lower incisor with circular cross-section; m1–2 cusp formula 5:4 and 3:2, respectively; m1 significantly narrower than m2, with distal end wedged in the notched mesial surface of m2; the two lingual cusps of m2 strongly crescentic and about twice the width of the buccal cusps.

Geographic and stratigraphic range.—Upper Paleocene (Gashatan) of Mongolia and China.

Kingdom

Animalia

Phylum

Chordata

Class

Mammalia

Family

Lambdopsalidae

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