ammonites
Tethyochonetes quadrata Zhan 1979 (lamp shell)

Strophomenata - Productida - Rugosochonetidae

Alternative combination: Waagenites quadrata

Full reference: L.P. Zhan. 1979. Taxonomic Descriptions. The Coal-Bearing Strata and Fossils of the Late Permian from Guangdong 1-166

Belongs to Tethyochonetes according to W. H. He et al. 2009

Sister taxa: Tethyochonetes chaoi, Tethyochonetes convexa, Tethyochonetes dissulcata, Tethyochonetes flatus, Tethyochonetes guizhouensis, Tethyochonetes liaoi, Tethyochonetes longtanensis, Tethyochonetes pigmaea, Tethyochonetes soochowensis, Tethyochonetes striata, Tethyochonetes wongiana

Type specimen: Its type locality is Shuizhutang, Lianxian Area, Shuizhutang Fm, which is in a Wuchiapingian coastal siliciclastic in the Shuizhutang Formation of China

Ecology: stationary low-level epifaunal suspension feeder

Average measurements (in mm): valve 4.69 x 7.75