Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 26. 2008. (Budapest, 2008)
Shape — High conical test with rather deep suture; juvenile whorls possessing somewhat less convex surface than later ones. Periphery rounded, base convex and broadly phaneromphalous with subangulate umbilical margin. Last peristome probably thickened as suggested by one or two weak collabral constrictions on last whorl of figured shelly and some inner mould specimens. Sculpture — Whorls and base as well as inner parts of umbilicus covered by granulate spiral cords; strongest of them running at periphery. Some cords at abaxial part of base follow each other with narrower interspaces, than the rest. Very fine, prosocline growthlines yield collabral ornament. Remarks — The shape and the ornament correspond to DE STEEANI'S species, excepting two characters and the generic arrangement. The doubtfulness of its relegation to Pleurotomaria, remarked by DE STEFANI (1887), was established; it is an eucyclid species. HoweA r er, it is unknown, whether DE STEFANI'S specimens have an umbilicus and tubercles or not, thus the use of open nomenclature is necessary. CONTI & MONARI (1991) published a species under the same name. Because of the poor preservation of the Türke}' as well as the Bakony Mts specimens, their belonging to the same species remains also doubtful. Unfortunately, no oppormnity for comparison to DE STEFANi's originals has yet been found. Distribution — PNorthern Apennines, (Italy), Sinemurian; Lókút, Kericser (Bakony Mts), beds with Late Sinemurian to Lower Pliensbachian mixed fauna (Obtusum to Ibex Zone) and Davoei Zone; ?W r estern Pontids (Turkey), Raricostatum to Ibex Zone. Eucyclus (Lokuticyclus) spinnerinensis n. sp. (Figure 76) 1861: Turbo orion D'ORB. — STOLICZKA, p. 176, pi. 2, fig. 13. 2003: Eucyclus (Lokuticyclus) sp. — SZABÓ in \'( >Ros et al., p. 62, pl. 5: 16-18. Holotype — NhM 1861 /0001 /0028. Type locality — Schafberg over St. Wolfgang, Austria. Type strata — Vertical fissure-filling limestone with fossils of Fe-Mn-oxide coating. Name — Formed from name of Spinnerin, a peak nearby the inferable locality. Diagnosis — Low spired, rapidly expanding, turbiniform shell with deeply impressed suture, narrow feebly convex, almost horizontal subsutural ramp on last whorl; cross-section of whorls subcircular; moderately broad umbilicus on base; sculpture of spiral threads, being sparser and stronger on whorls than on base. Material — Single specimen of Mn-oxide coating (NhM 1861/0001/0028). Measurements holotype H *12 HL 9.4 HP 7.7 D 12.2 W 7.2 AA 80° AL Figure 76 — Eucyclus (Lokuticyclus) spinnerinensis n. sp., holotype. — 13 a-b: copv of "Turbo orion D'ORBIGNY" figures from STOLICZKA (1861) Tafel II; A-C: "apertural" (A), dorsal (B) and oblique "apertural" views, xl; D: magnified "apertural" view to show the ornament, x3. Shape — The specimen is low turbiniform, spire has feebly cyrtoconoidal outline, and extremely thinwalled shell like the other members of the subgenus. Whorls are convex, rapidly expanding, and impressed suture separates them. Narrow, feebly convex ramp developed on last whorl without marked abaxial boundary. Base convex and moderately phaneromphalous; margin of umbilicus is rounded-angular. Peristome does not show outer modification, internally not observable, but trace of inner thickening visible on inner mould of last whorl. Sculpture — Ornament consists of sparse, spiral threads on whorls, and dense, weaker threads on base. Delicate, collabral threads cross them on juvenile whorls with small granules at crossing-points. On penultimate whorl, early network ornament gradually vanishes, only spiral threads persist to peristome. Fine, dense, subregularly repeating growth-threads cross them. Remarks — STOLICZKA indicated this species as "selten" that is more than one, but only a single specimen is found available. It is different from the previously known members of subgenus Lokuticyclus; it has the lowest spire, therefore all related measurements can help the identification. Character of the ornament is most similar to that of Eugclus (Eokutigclus) urkutensis in having an early network, from wfiich the collabral components vanish before reaching the adult stage; however, the spiral angles are strongly different. In having few inner shell constrictions, Eugclus (Eokutigclus) spinnerinensis n. sp. is similar also to Eugclus (Eokutigclus) aff. campiliensis, but the narrower spiral angle, the higher spire, and the markedly nodosed ornament (even on the base) distinguish the
