Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 26. 2008. (Budapest, 2008)

Family ? Trochotomidae Cox, 1960 Genus Urkutitoma SZABÓ, 1984 Type species: Urkutitoma bartkoi SZABÓ, 1984 Urkutitoma bartkoi SZABÓ, 1984 (Figure 46) 1984: Urkutitoma bartkoi sç. n. — SZABÓ, p. 70, fig. 3. ? 1995: Sisenna cf. foveolata (EUDES-DESLONGCHAMPS) — CONTI & MONARI, p. 201, pl. 1, fig. 9. Material — Only one, rather poorly preserved specimen (holotype, HGM J 10143). Measurements H HL HP holotype *16.8 11.3 8.5 Figure 46 — Urkutitoma bartkoi SZABÓ, 1984, refïguration of the holotype; note presence of a selenizone and the entire outer lip (no slit). —A-B =xl, C: x6.7. D \\ AA AL 7.4 64° 64° Shape — Turbiniform shell with somewhat convex whorls. Top of convexity coincides with selenizone mnning below midwhorl. Only small shelly parts of last whorl preserved therefore position of anal trema unknown. Its existence may be inferred from joint presence of uninterrupted outer lip and selenizone on earlier whorls. Aperture nearly quadrangular with slighdy arched sides, concave at parietal and columellar (umbilical) parts, convex at bom outer lip parts. Umbilicus surrounded by swollen angulation, resembling to trace of rudimentär}' siphonal outlet. Inner lip callosity probably bends over umbilicus. Sculpture — Ornament consists of collabral and spiral threads, resulting network on whorls with small granules at crossing points. On last whorl, spiral elements strengthened as cords. Collabral elements prosocline between selenizone and lower suture/periphery. Remarks — In spite of the poor state of preservation, the specimen shows a number of features, which demanded the definition of Urkutitoma as new genus. Among the trochotomids, there are no species, which would not be separable. Without outer lip, this species is somewhat similar to the Wortheniopsis (Sisenna) species group in its shape and granulate ornament, but the characters of selenizones, the collabral ornaments between the anal fasciole and the lower suture

/peripher}

7

, and the measurements support the distinction. Distribution — Úrkút, Csárda-heg}

7 (Bakony Mts), Lower(?) Sinemurian; PSasso di Pale (Central Apennines), Upper Pliensbachian. Urkutitoma? sp. (Figure 47) cf. 1964: Trochotoma subturrita (D'ORBIGNY) — SACCHI VlALLl, p. 7, pl. 1, figs 13 a-b, 14. 1980: Sisenna subturrita (DESLONGCHAMPS, 1849)? — SZABÓ, p. 53, pl. 1, figs 6-8. Material — Several specimens of bad state of preservation (HGM). Measurements H HL HP D W AA AL Figure 47: A-B - 11 7 13 9 Shape — Gradate shell with angulation, reinforced by carina-like spiral swelling on post-ju\

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enile whorls. Morphology of peripher}

7 similar to that of angulation of whorls; rather deep, spiral concavity visible between them. Ramp convex but concave along swelling. Selenizone placed on adapical slope of spiral swelling. Base flattened but slighdy convex. Single constriction (inner varix) observable on base between periphery and axial region short before (most probably) last peristome (about 20° in axial view). This morphological element found on four, mainly inner mould specimens, suggesting adult size of specimens around 25 mm diameter and 30 mm height. Narrow um-