Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 79. (Budapest 1987)
Conti, M. A. ; Szabó, J.: Comparison of Bajocian gastropod faunas from the Bakony Mts. (Hungary) and Umbria (Italy)
maria, only the nucleus and the first whorl are slightly dapressed. In spite of this fact, the genus belongs to Phymatopleuridae without any doubt because all the other features correspond to the definition of the family. The diagnostic ones are: selenizone is concave and delimited by two spiral cords; ornament of retiform cords. The type species of Trochotomaria was originally ranged into Pleurotomariidae with some remarks on the main differences between "Leptomaria''' somhegyensis and the typical Leptomaria (SZABÓ, 1980, p. 59). Its belonging to Pleurotomariidae seemed more possible because there was no trace of evolutionary connections with the other members of Phymatopleuridae and by the definition of this family, an important character was lacking in "L." somhegyensis namely the planispiral initial whorls. Disregarding this point, Trochotomaria fits well in Phymatopleuridae just like the Liassic Anodomaria SZABÓ, 1980, which was originally defined as a subgenus of Pleurotomaria. Trochotomaria somhegyensis (SZABÓ, 1980) 1980: Leptomaria somhegyensis SZABÓ, p. 59, Pl. Ill: figs 1-3. 1981 : Trochotomaria tricarinata CONTI et FISCHER, p. 140, Pl. I: 1-3. 1984: Trochotomaria tricarinata CONTI et FISCHER — CONTI et FISCHER, p. 134, fig. 6, Pl. I: 14a-e, 15a-d. Remarks — Subsequent collections at the type locality resulted in some additional specimens of this species. These show shell parts which are transitional between the earliest ontogenetic stage, Fig. 1. A = Shifting of selenizone from midwhorl below midwhorl in Trochotomaria somhegyensis , B — F = Ornamental variations in Proconulus epuliformis from the Somhegy locality
