Tibetothyris Jin and Sun, 1976

MACFARLAN, DONALD ALEXANDER BANKIER, 2023, Otapirian (Rhaetian) Terebratulida (Brachiopoda) of Zealandia, Zootaxa 5374 (1), pp. 1-34 : 6-7

Tibetothyris Jin and Sun, 1976

1976 Tibetothyris Jin and Sun , in Jin et al. 1976 p. 27.

2006 Tibetothyris Jin and Sun, 1976 ; Jin et al. p. H2032.

2017 Tibetothyris Jin and Sun, 1976 ; Sun et al. p. 958.

Type Species Tibetothyris depressa Jin and Sun, 1976 ( OD) .

Jin and Sun (1976) described Tibetothyris from the Norian of Tulong , Xizang (Tibet). The type species has not been recorded elsewhere. It is strongly folded and of similar shape to the two New Zealand species .

They also included the much more widespread Terebratula julica in Tibetothyris . It was described by Bittner (1890) from the Late Triassic of the European Alps but has since been recorded from Hungary ( Bittner 1912, Detre 1970), the Sinai ( Awad 1945), China ( Jin et al. 1976, Sun et al. 2017), East Timor ( Krumbeck 1924, Wanner 1956), and California ( Smith 1927). Tibetothyris julica is more rounded, with the plicae developed only on the anterior part.

The two species described here were originally identified in collections as Dielasma sp. and are included in Tibetothyris on their similarity in shape and internal characters to Tibetothyris depressa and T. julica . On both new species the dental plates are short and begin some distnce behind the tip of the beak. It is possible that the posterior ends of these were buried in callus.