Qishou jizantang, Mao & Meng, 2019

SPECIES QISHOU JIZANTANG SP. NOV.

( FIGS 1–5)

urn:lsid:zoobank.org:act:7DF9F120-DEB0-4B1B-9C02-D5C9B246D466

Synonyms: Shenshou lui (partim) ( Bi et al., 2014: extended data, figs 4a, 8b).

Etymology: Qi, pinyin of the Chinese character for unusual, unexpected and surprising; shou, beast; jizantang , pinyin of the Chinese name of the museum where the holotype is housed.

Holotype: The holotype (JZT-D061) is a skeleton preserved in one slab with the dorsal side exposed ( Fig. 1A). It is housed in the Jizantang Paleontological Museum , Chaoyang County, Liaoning Province, China. Type locality and horizon: Daxishan site, Linglongta township , Jianchang County , Liaoning Province, China; Tiaojishan Formation , ranging approximately from 164 to 159 Myr (the Oxfordian) (see Comments above for stratigraphy and age of the family).

Diagnosis

Among known euharamiyidans, Qishou jizantang is most similar to Shenshou lui (represented by the holotype LDNHMF2001), sharing the features outlined in the family diagnosis. Qishou jizantang differs from S. lui in having the upper incisor with a curved mesial surface ( Fig. 1B), somewhat procumbent position and three cusps ( Fig. 1D); upper molars more spindleshaped, with cusp A1 being more distally extended and the mesial end of the central valley at the mesial-most point ( Figs 3A, B, 4); upper and lower molars bearing more cusps on both the lingual and labial cusp rows; row-b cusps of lower molars aligning mesially with a1 (not mesially extended); m2 longer than m1; functional cusp denoted as AA1(C1) on the labial side of P4 (P3 and P4 unknown in S. lui ; Figs 3A, B, 4B).