Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 21. 2003. (Budapest, 2003)
during the Jurassic (SZABÓ 1995) therefore we shall consider their habit in a palaeoenvironmental reconstruction. Trochoidean species also indicate presence of rocky sea bottom parts in depth interval of the photic zone with high probability 7 . Palaeontologists (see: MORRIS & CLEEVELY 1981) attribute sedentary mode of life on soft bottom to the discoidal open coiled or similarly shaped gastropods {Cyclostomaria, Discohelix) with filter-feeding mode of life. Regarding the suggestions for the substrate, the gastropods of the above fauna must have been mixed from different biotopes. Wilsoniconcha ? (Eucyclidae, Chnodontinae), Anticonulus, Ataphrus and Crossostoma (Trochoidea) are most probably hard bottom dweller and herbivorous. (1) They lived on a submarine elevation together with some of the pleurotomarioideans. The remaining species inhabited the basin around the elevated area on/in soft sediment that filled the fissure after its opening. (2) The hard and soft bottom parts might have been spotted on the same bathymétrie level. Pietteia (Trietteia ?) fischeri (STOLICZKA, 1861) (Aporrhaidae) indicates muddy substrate in its biotope. Palaeobiogeography — Anodomaria seemed to be a typically Mediterranean gastropod genus with a few species (SZABÓ 1988). However, recendy some other species have been found also in the Jurassic of Kachchh (India, Ethiopian Faunal Province; JATTLY et al. 2000) but in younger strata. Eaevitomaria has not been found out of the Jurassic Mediterranean Province. Discohelix orbis is one of the most common species in the latest Sinemurian to Late Pliensbachian gastropod faunas of the Mediterranean Faunal Province. This species is usually associated with Eugclus (E.) alpinus in Adnet/Ammonitico Rosso Limestone facies and foothill accumulated ("stratified") Hierlatz Limestone, they are most reliable "palaeobiogeographical indices". Discohelix reticulata STOLICZKA, 1861 has been found only in a few (4) specimens but its area seems to be rather wide (Hierlatz, Schafberg — North Calcareous Alps, Austria; Úrkút — Bakony Mts, Hungary; South Crimea — Ukraine). Pietteia (Trietteia ?) fischeri (STOLICZKA, 1861) is the earliest known aporrhaid species in the Mediterranean Province. Systematic composition of gastropodfauna Class Gastropoda CUVIER, 1897 Subclass Archaeogastropoda THIELE, 1925 Order Pleurotomariina COX & KNIGHT, 1960 Superfamily Pleurotomarioidea SWAINSON, 1840 Family Gosseletinidae WENZ, 1938 Genus Cyclostomaria SZABÓ, 1980 Cyclostomaria sp. Family Pleurotomariidae SWAINSON, 1840 Genus Anodomaria SZABÓ, 1980 Atmdomana anodosa SZABÓ, 1980 Genus Pleurotomaria DEFRANCE, 1826 Pleurotomaria aff. anglica). SOWERBY, 1818 Pleurotomaria sp. Family PPleurotomariidae SWAINSON, 1840 Genus Bathrotomaria COX, 1956 Bathrotomaria intermedia (MÜNSTER, 1844) Genus Laevitomaria CONTI & SZABÓ, 1987 Eaevitomaria coarctata (STOLICZKA, 1861) Order Trochina COX & KNIGHT, 1960 Superfamily Trochoidea RAFINESQUE, 1815 Family Trochidae RAFINESQUE, 1815 Subfamily Proconulinae COX, 1960 Genus Anticonulus COSSMANN, 1918 Anticonulus lautus (STOLICZKA, 1861) Family Ataphridae COSSMANN, 1918 Subfamily Ataphrinae COSSMANN, 1918 Genus Ataphrus GABB, 1869 Ataphrus laeviusculus (STOLICZKA, 1861) Ataphrus latilabrus (STOLICZKA, 1861) Subfamily Crossostomatinae Cox, 1960 Genus Crossostoma MORRIS & LYCETT, 1851 Crossostoma ? sp. Superfamily Eucycloidea KOKEN, 1896 Family Eucyclidae KOKEN, 1896 Subfamily Eucyclinae KOKEN, 1896 Genus Eugclus). A. EUDES-DESLONGCHAMPS, 1860 Subgenus Eugclus). A. EUDES-DESLONGCHAMPS, 1860 Eugclus (Eugclus) alpinus STOLICZKA, 1861 Eugclus (Eugclus) sp. Subgenus Urkutigclus SZABÓ, 1995 Eugclus (Urkutigclus) orion (STOLICZKA, 1861) Subfamily Chilodontinae WENZ, 1938 Genus ^Wilsoniconcha WENZ, 1939 Wilsoniconcha ? aff. hiplicata (M. GEMMELLARO, 1911) Superfamily Cirroidea COSSMANN, 1916 Family Cirridae COSSMANN, 1916 Genus Cirrus J. SOWERBY, 1815 Citrus boemesi (STOLICZKA, 1861) Cirrus sp. Superfamily PCirroidea COSSMANN, 1916 Family Discohelicidae SCHRÖDER, 1995 Genus Discohelix DUNKER, 1848 Discohelix orbis (REUSS, 1852) Discohelix reticulata STOLICZKA, 1861 Subclass Caenogastropoda COX, 1959 Order Uncertain Superfamily Loxonematoidea KOKEN, 1889 Family Zygopleuridae WENZ, 1938 Genus Anoptychia KOKEN, 1892 Anoptychia crenata (STOLICZKA, 1861) Superfamily Stromboidea SWAINSON, 1840 Family Aporrhaidae ADAMS, 1858 Genus Pietteia COSSMANN, 1904 Subgenus Trietteia CONTI & SZABÓ, 1987 Pietteia (Trietteia }) fischeri (STOLICZKA, 1861) Abbreviations, indicating depositories in the brief description of the gastropod species: HGI = Hungarian Geological Institute (Budapest); GBA = Geologische Bundesanstalt (Vienna); NM = Naturhistorisches Museum (Vienna); MTM = Hungarian Natural History Museum (Budapest)
