Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 90. (Budapest 1998)

Dulai, A.: Early Jurassic brachiopods from the basal layers of the Pisznice Limestone of Lábatlan (Gerecse Mts, Hungary)

Pliensbachian) brachiopod faunas of the Transdanubian Central Range (VÖRÖS in HAAS et al. 1984, VÖRÖS 1997). This species was figured and described in detail from Lókút Hill by DULAI (1992: 55). Liospiriferina aradasi (GEMMELLARO) - Only one specimen was found at the upper part of Póckő section. This species has never been mentioned from Hungary in the literature, but several specimens were also found at Borzavár in the Bakony Mts (VÖRÖS, pers. comm). ALMÉRAS (1964) mentioned this species from the Sinemurian. Liospiriferina guembeli (NEUMAYR) - One specimen is known from Póckő in the collection of the Hungarian Geological Institution and one other specimen from the first layer of Tölgyhál quarry. This species has never been mentioned from Hungary in the literature. The generic classification of this species follows ROUSSELLE (1977). There are several weak ribs and faint growth lines on the surface of the specimens, but they are smooth in appearance. According to ALMÉRAS (1964), L. guembeli is known from the Hettangian. Liospiriferina sp. - Small-sized, smooth specimens were found in layers 1 and 4 of Póckő. These are different from L. alpina in their more pointed beak, and the development of a weak uniplication on the surface. Another two smooth spiriferid specimens, also in the collection of the Hungarian Geological Institution, arc different from L. alpina in their beak of the brachial valve, which is in very high position, nearly opposite to the beak of the pedicular valve. Koninckodonta sp. - This taxon was found in the basal layer of Póckő, and in the collection of the Hungarian Geological Institution. The generic classification of the small-sized specimens is unambiguous on the basis of the characteristic shell structure and the concave brachial valve. However, the poor preservation of the specimens makes a specific identification impossible. Lobothyris andleri (OPPEL) - Three specimens occur in the upper part of Póckő section. All specimens are smaller in size, than it is known from the literature and from other localities (e.g. Hettangian Kardosrét Limestone, DULAI 1993/?). They are probably juvenile specimens. This species is known from the Hettangian, Sinemurian and Pliensbachian localities of the Transdanubian Central Range (DULAI 1993/;, VÖRÖS 1997). L. andleri was figured and described in detail by DULAI (1993/?: 37). Linguithyris aspasia (MENEGHINI) - Only a small-sized, fragmentary specimen is known from the collection of the Hungarian Geological Institution. This species is one of the most frequent Late Sinemurian and Pliensbachian brachiopod of the Transdanubian Central Range (VÖRÖS 1997) but recently it was also found in Early Sinemurian faunas by the author (Lókút Hill, Vöröshíd quarry). Specimens of L. aspasia are significantly smaller at all Lower Sinemurian localities, than it is known from younger formations. This species was figured and described from Lókút Hill by DULAI (1992: 67). Phymatothyris aff. cerasulum (ZlTTEL) - This taxon was found in both the Tölgyhát quarry and Póckő section. In layer 4 of Póckő, this species is the predominant element of the fauna (more than half of the determinable specimens belong to this species). This taxon is clearly different from the typical P. cerasulum, because it is more flattened and more elongated than the Pliensbachian species (Figs 16-17). This form is also known from the upper part of the Vöröshíd quarry. P. cerasulum was reported from Sinemurian and Pliensbachian localities of the Transdanubian Central Range (VÖRÖS 1997). Zeilleria cf. alpina (GEYER) - Relatively large-sized, but fragmentary specimens were found at the lower part of the Tölgyhát quarry and at the upper part of Póckő. Z. alpina is a common species in Sinemurian and Lower Pliensbachian formations of the Transdanubian Central Range (VÖRÖS 1997). This species was figured and described in detail (including the internal characters) by DULAI (1992: 71). Zeilleria mutabilis (OPPEL) - This very variable species is known from both localities. At the basal layers of these localities small-sized, juvenile forms were found, which are pentagonal in outline. More elongated specimens occur in the upper part of the Tölgyhát quarry and in the collection