Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 26. 2008. (Budapest, 2008)
1966: Cryptaenia expansa (SOWERBY) — BOURROUILl I, p. 43, fig. 16. non 1980: Ptychomphalus expansus (SOWERBY, 1821) — Sz.ABÓ, p. 55, pl. 1, fig. 9. 1997: Ptychomphalus expansus (SOWERBY, 1821) — FISCHER & WEBER , p. 160, pi. 26, figs la-b, 2, 3. non 1998: Ptychomphalus expansus (SOWERBY, 1821) ? — GRÜNDEL & NÜTZEL, p. 66, Taf. 1, figs 6-9. non 2008: Ptychomphalus expansus (SOWERBY, 1821) — SCHUBERT, GRÜNDEL & NÜTZEL, p. 20, figs 2: A-H. Material — Fifteen, rather poorly preserved specimens (2008/69/36/1-15). M e a s u r e m e n t s H HL HP D W AA 2008/69/36/1 *8.5 *7 *6.5 16 *6.7 Shape — Sublenticular shell with low, coeloconoidal spire and rather rapidly widening, flat or feebly convex whorls, changing into feebly concave only on adult shell near peristome (more exactly: concavities below subsutural swollen belt and above peripher)' gradually widen, then meet). Apex blunt, nucleus and first whorl of protoconch almost planispiral. Periphery angular but rounded in short radius. Selenizone narrow and hardly identifiable, two weak incisions delimit it. Its abapical half belt coincides outermost line of peripher 1 ,-. Selenizone exposed only on last whorl but overlapped on former whorls, suture just coincides with adapical rim of selenizone of previous whorl. Base strongly convex and higher than shell parts above periphery. Peristome discontinuous, columellar lip thickened and extending as heavy callus to middle of base. Outer lip not preserved on available specimens. Sculpture — No ornament observable, disregarding extremely fine growth lines on shell spots of some specimens (possibly owing to their strong re-crystallisation). Remarks — SOWERBY's (1821) species has feebly concave whorls, convex selenizone and no nodes on its subsutural spiral swelling. In the available specimens, concavity of the whorls develops only in very late growth phase that seems acceptable as intra-specific variability. However, some authors identified shells with nodes and/or concave selenizone as Ptychomphalus expansus. In the synonym list notices indicate these. Presence-absence of nodosity 7 and shape of the selenizone are observed as available species distinctive characters in Ptychomphalus. Unfortunately these characters AL have not been used consequently previously; sometimes even the information is lacking from the publications. Distribution — The species is identified from the epicontinental, as well as the Mediterranean Lower Jurassic in Europe and in northern Africa. The authors mention it from the Lower and Middle Liassic, usually without further precision. Figure 17 — Ptychomphalus expansus (SOWERBY, 1821) from the type locality of the Hierlatz Limestone. — 16 a-b: copy of STOLICZKA (1861) figures from Tafel III; A-D: photos of one of the two specimens, saved in the "originals collection"; apertural (A), basal (B), apical (C) and dorsal (D) views, x 1.6. Ptychomphalus kericserensis n. sp. (Figure 18) 1980: Ptychomphalus expansus (S( )WERBY, 1821) — SZABÓ, p. 55, pl. 1, fig. 9. Holotype— HGM J. 08.16.1. (Figure 18). Type locality — Lókút, Kericser-dúlő (Bakony Mts, Hungary). Tvpc strata — Hierlatz type limestone beds, rather rich in micrite and containing also Fe-Mn-oxide coated shells; co-occurred ammonites mixed from Obtusum to Ibex Zones (Upper Sinemurian to Lower Pliensbachian). Name — From the name of locality area (Kericser-dűlő = an agricultural area SW from village Lókút, Hungary). Diagnosis — Small, lenticular shell with tubercled subsutural swelling on whorls except Pearliest (not preserved) and last half ones. Preserved inner lip parts show form, typical for Ptychomphalus. Selenizone concave and exposed only on last whorl. Suture slightly impressed and running just on adaxial edge of selenizone on previous whorl. Base covered by fine, dense spiral threads. Material — A single shelly specimen without earliest shell parts and outer lip. Measurements H HL HP D W AA AL holotype 5 4.5 11* 4.5* - 130°
