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

Genus Bathrotomaria COX, 1956 Type species: Trochus reticulatus ). SOWERBY, 1821 Bathrotomaria martiae n. sp. (Figure 45) 1980: Bathrotomaria aff. subreticulata (D'ORBIGNY, 1850) — SZABÓ, p. 60, pi. 2, fig. 1. Holotype — HGM J.

08.13.1. (Figure 45: A-D); paratype: HGM J.

08.14.1. Type locality — Lókút, Kericser (Bakony Mts). Type strata — Atypical Hierlatz Limestone of high micritic content, bearing ammonite fauna, mixed from Obtusum to Ibex Zone interval. Name — Dedicated to Márta BÁNPATAKI, wife of the author. Diagnosis — Rounded juvenile but clearly angular last whorls; network ornament on whole shell, its spiral components predominant on last whorl and on base; subsutural belt of whorls with periodically repeating, sharp nodes, being collabrally extended as gradually weakening riblets then low ridges. Material — Two damaged shelly specimens with ferromanganese oxide coating HGM J.

08.13.1., and J.08.14.

1. Measurements H HL HP holotype *10 *6 Shape — Small, gradate shell. Ramp broad and rather steep on last whorl but less distinct in juvenile growth stages together with bordering abaxial angulation. Selenizone courses just upon angulation. Outer face flattened and subparallel to axis. Peripher}' rounded; base flattened and narrowly phaneromphalous. Columellar lip seems somewhat thickened; outer lip unknown. Sculpture — Whorls and base ornamented with almost evenly spaced spiral threads of slightly different strength, crossed by threads, riblets, ridges and growthlines. Juvenile ornament consists of equally strong spiral and collabral elements, resulting in network. On postjuvenile whorls, riblets start from regularly repeating, sharp nodulae, sitting just below suture. These riblets change into low ridges in short distance then fade out at selenizone. Collabral threads of outer face gradually vanish after penultimate whorl; no marked ornamental element crosses spiral threads on last whorl between selenizone and umbilicus. Selenizone subdivided by single spiral cord, running just on angulation, into narrower adapical and wider abapical belts; regularly repeating and asymmetrical lunulae developed. Remarks — The increased density

7 of the lunulae on the last whorl of the holotype indicate its probably adult stage (the dimensions of the second specimen are also similar). Despite the characteristic shape and ornament, this form cannot be identified with anyone of the previously figured species. It resembles to the original drawings of Pleurotomaria subreticulata D'ORBIGNY, 1856, however, the photos of the type specimen, published by FISCHER & WEBER (1997) under the name Bathrotomaria reticulata (J. A. EUDES-DESLONGCHAMPS, 1849), are dissimilar both in shape and sculpture. It has smaller, denser and weaker riblets at the place of the tubercle row of Bathrotomaria martiae n. sp. specimens, and has an elevated, keel-like selenizone, while it is not raised from the neighbouring surface of the ramp and the outer face in the Bakony Mts specimens. D W AA AL -14 *6.5 64° 64° [There is a conflict in the nomenclature, concerning the authorship by FISCHER & WEBER's (1997) name usage: Bathrotomaria reticulata (J. A. EUDES-DESLONGCHAMPS, 1849), against the type species of the genus, Bathrotomaria reticulata Q. SOWERBY, 1821), which remained unresolved.] Distribution — Lókút, Kericser (Bakony Mts), beds with mixed Obtusum to Ibex Zone fauna (Upper Sinemurian to Lower Pliensbachian). Figure 45 — Bathrotomaria martiae n. sp., holotype. — A-B: dorsal (A) and basal (B) views, xl; C—D: magnified dorsal (C) and basal (D) images to show details of the sculpture, x4.