Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 26. 2008. (Budapest, 2008)
42 SZABÓ, J.: Revision of Hierlatz Limestone gastropods 1849: Pleurotomaria Deshayesii var. subgradata —J. A. EUDES-DESLONGCHAMPS, p. 130, pi. 9, figs 5 a-c. cf. 1854: Pleurotomaria Deshayesii DESL. — D'ORBIGNY, p. 420, pi. 354, figs 1-5. 1861: Pleurotomaria intermedia MÜNST. — STOLICZKA, p. 188, pi. 4, fig. 6. 1997: Perotrochus deshayesii (J. A. EEDES-DESLONGCHAMPS, 1849) — FISCHER & WEBER, p. 161, pi. 31, figs 1-5. Material — STOLICZKA's single specimen has neither apex nor peristome (GBa 2008/69/42). Measurements H HL HP D W AA AL GBa 2008/69/42 **35 **22 **14 *37 *15 75° 65° Shape — Medium sized, trochiform species with moderately convex whorls, sharply angular and distinctly gradate in juvenile stage. Angulation and ramp becomes gradually rounded and narrower. Ramp and outer face flattened on juvenile shell but gradually become rather convex towards last whorl, where practically disappears. Suture moderately impressed. Selenizone flat on juvenile shell, then feebly convex; its position slightly above middle of outer face. Periphery rounded angular, base slightly convex and rather broadly phaneromphalous. Sculpture — Excepting selenizone, whorls and base co\ r ered by unequally spaced spiral cords, slightly variable in strength. Selenizone smooth on earliest visible whorls, but spiral threads co\ r er it later. Other spiral threads appear mainly as interposed ones between pairs of cords on both sides of selenizone. Ramp collabrally ribbed on all preserved whorls. Ribs onset at suture and terminate at ramp angle on juvenile shell but almost reach selenizone on later whorls. Ribs ha\ r e unique shape: they feebly slope abaperturally, but their frontal side steep, almost perpendicular to surface of shell. Remarks — STOLICZKA (1861) identified his find as Pleurotomaria intermedia MÜNSTER, 1844, however this name refers actually to a Bathrotomaria species because its selenizone runs just on the angulation of the whorls not on the outer face as it is well observable in the figured Hierlatz specimen. The species nearest in shell morphology is Pleurotomaria deshayesii (var. subgradata) J. A. EUDES-DESLONGCHAMPS, 1849, the apical and last whorl spiral angles of the other varieties are usually much higher than in the Hierlatz Limestone one. Var. tumidula has also similar spiral angles, but its whorls are more rounded and the ornament is obscure. FISCHER & WEBER (1997) have ranged this species to Perotrochus but the Hierlatz find clearly shows the Pleurotomaria characters in juvenile stage; the ramp becomes strongly rounded only on the last whorl. Distribution — Calvados (France), Upper Pliensbachian (Margaritatus to Spinatum Zone); Hallstatt, Hierlatz Alpe, Sinemurian (Oxynotum Zone). Pleurotomaria suessii HÖRNES, 1853 (Figure 36) 1853: Pleurotomaria Suessii HÖRNES — HÖRNES, p. 762. pars 1861 : Pleurotomaria Suessi HÖRNES — STOLICZKA, p. 192, pi. 5, figs 1 a-b. non 1911: Pleurotomaria Suessi HÖRNES — M. GEMMELLARO, p. 213, pi. 10, figs 10-12. non 1980: Cyclostomaria suessi (HÖRNES) — SZABÓ, p. 64, pl. IV, fig. 4. ? 1994: Pleurotomaria suessii HÖRNES — CONTI & MONARI, p. 202, Fig. 2. 2008: Pleurotomaria suessii HÖRNES — SZABÓ, p. 169, Fig. 2: 9-13. Material — Single, damaged specimen (2008/69/45/1) from the Pleurotomaria suessii'box of STOLICZKA (1861) "originals collection" without earliest shell parts and peristome; most probably it is a syntype to HÖRNES's description, selected as lectotype by SZABÓ (2008). Measurements: H HL HP lectotype **18 *12.6 *9 Shape — Flattened coeloconoidal shell of gradate outline with broadly phaneromphalous, rather strongly convex base. Whorls bear moderately wide ramp and broader outer face with nearly median selenizone, being concave along full length of preserved shell. Periphery rounded-angular. Umbilicus has also gradate interior. Sculpture — Subregularly repeating dense riblets ornament ramp on all preserved whorls. Riblets reach adapical edge of selenizone on spire whorls but fade away at ramp angle on last whorl. Beside riblets, only fine growthlines cross spiral ornament. Dense, thin spiral threads cover whorls and outermost, narrow belt of base. Stronger threads develop at edge of ramp (single), on both edges of selenizone and some on abapical part of outer face. D W AA AL *32 *11 *105° *110° Obscure spiral lines of irregular interspaces appear also on other parts of base. Neither spiral lines nor regular lunulae appear on selenizone. Remarks — The measurements and the other morphological details of the available specimen weD correlate to the first description of P. suessii that seems to speak about a single specimen but notices about further specimens are also found. It is rather conceivable that HÖRNES (1853) has based the description of the species on this single specimen. Howe\ r er, it is impossible to reconstruct if the other specimens in the box really belonged to the syntypes or STOLICZKA added them to the single P. suessii. P. suessii resembles "morphe exertiuscula" (FISCHER & WEBER 1997) of P. debuchii). A. EUDES-DESLONGCHAMPS,
