Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 80. (Budapest 1988)

Pálfy, J.: Middle Triassic rhynchonellids from the Balaton Highland (Transdanubian Central Range, Hungary)

Fig. 14. Drawing of five specimens of Piarorhynehella trinodosi (BITTNER, 1890) to show the variation in the anterior commissure. Fig. 15. Trigonirhynchella attilina (BITTNER, 1890): a series of 16 transverse sections through the posterior part of a specimen from Felsőörs. Original length 8.1 mm. The crura persisted to 2.2 mm from the posterior end of the shell.