Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 19. 2001. (Budapest, 2001)
Hug dus (Eucyclus) barnabasi SZABÓ, 1995 Eucyclus (Eucyclus) sp. Eucyclus (Eokuticyclus?) sp. Marmolatella? sp. Tretospira? sp. Purpuroidea? sp. The composition of the fauna provides some palaeoecological indications that are more or less conform to those that are widely accepted concerning the depositional environment of the host lithology. The Vöröshíd fauna consists of 32 eucyclid (94 %) and 2 purpurinid specimens. Living relatives of Eucyclidae inhabit predominantiy bathyal to abyssal bottom of unconsolidated, fine-grained sediments (HICKMAN & MCLEAN 1990, "tribe Calliotropini"). A similar habitat seems feasible also in the case of the Jurassic eucyclids (SZABÓ 1995). The indication of the Tretospira? specimens is uncertain, however, other occurrences suggest preference/tolerance of similar physical conditions to those of the eucyclids. Possibly they belonged to the group of benthic predators; TAYLOR et al. (1980) regard Purpurinidae to contain the ancestor of the modern carnivorous neogastropods. Purpuroidea is known from shallow water Mesozoic palaeoenvironments therefore the presence of Purpuroidea? sp. in the Kis-Gerecse seems exotic just like that of the Marmolatella? sp. specimen in the "crocodile" section of Nagypisznice. In the case of the latter species, belonging to Stomatellidae cannot be completely excluded but living representatives of this family suggest also intertidal - shallow sublitoral habitat (HICKMAN &c MCLEAN 1990). Deep-water biotope and prédation on sessile, soft bodied organisms can be outlined for Eeptomaria sp. Regarding shell morphology, this Mesozoic genus is the closest relative of the living pleurotomariids. Systematics Measurements (in mm and °). AA = apical angle H — height of (preserved) shell AL = coiling angle of the (apparent) last (measurable) HL = height of last (preserved) whorl whorl HP = height of (apparent) peristome * = reconstructed D = maximum diameter of (preserved) shell ** = taken on earliest/latest measurable part if WP — width of (apparent) peristome specimen is damaged or not cleanable Class Gastropoda CUVIER, 1797 Order Archaeogastropoda THIELE. 1925 Suborder Pleurotomariina COX & KNIGHT, 1960 Superfamily Pleurotomarioidea SWAINSON 1840 Family Pleurotomariidae SWAINSON 1840 Genus LeptomariaE. EUDES-DESLONGCHAMPS, 1864 Leptomaria sp. (Plate I: 5-7) Material — Last whorl of a medium sized species. Measurements. H HL HP D WP AA AL 15.5 12.5 33 Description — Mode of coiling suggests rather low spired shell, ~100° of spiral angle can be reconstructed. Whorl having quadrangular cross-section and feebly convex outer surface with broad selenizone at midwhorl. Impression of slit (posterior end eroded) extends at least 40° backwards. Peristome prosocline, somewhat prosocyrt in both belts neighbouring slit; basal lip prosocline and slightly opisthocyrt. Periphery rounded angular; base slighdy convex with median depression, turning into rather narrow umbilicus (phaneromphalous). Remarks — The state of preservation permits only a generic identification of the specimen. In lack of the shell, the shape of whorl surface, the position and width (related to the distance between periphery and suture) of the selenizone are the characters, which distinctiy mark belonging to Eeptomaria, the Mesozoic pleurotomariid genus, which is morphologically most closely related to the extant members of the family. Distribution — Kis-Gerecse quarry, Toarcian (Hildoceras bifrons Zone).
