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

Subclass Caenogastropoda COX, 1959 Order Ptenoglossa GRAY, 1853 Superfamily Loxonematoidea KOKEN, 1889 Family Zygopleuridae WENZ, 1938 Genus Pseudokatosira NÜTZEL & GRÜNDEL, 2007 Type species: Turritetta undulata BENZ, 1832 Pseudokatosira undulata (BENZ, 1832) (Figure 84: C-D) 1832: Turritella undulata BEXZ — in: ZlETEN, p. 43, pi. 32, fig. 2. ? 1852: Chemnittda undulata — D'ORBIGNY, p. 35, pi. 237 fig. 16. 1858: Turritella undulata ZlF.T. — Qt'ENSTEDT, p. 153, pl. 19, fig. 13. non 1861: Chemnittna undulata BENZ — STOLICZKA, p. 163, pl. 1, fig. 1. ? 1869: Chemnitina undulata (ZlETEN) — DUMORTIER, p. 101, pi. 18, fig. 8. 1884: Turritella undulata ZlET. — QUENSTEDT, p. 305, pi. 196, figs 45-51. 1909: Katosira undulata BENZ — BRÖSAMLEN, p. 286, pi. 21, fig. 28. 1983: Katosira undulata (BENZ, 1832) — SZABÓ, p. 31,

pi. 2, figs 1-2. 1997: Katosira undulata (BENZ, 1832) — HAGELE, p. 81. 2002: Katosira undulata (BENZ, 1832) — NÜTZEL & HoRNUNG, p. 58, pl. 1, figs 4-5. 2007: Pseudokatosira undulata (BENZ, 1832) — NÜTZEL & GRÜNDEL, p. 59, pl. 1, figs 1-6. Material — Nine specimens, most of them preserved as steinkern. Measurements H HL HP D W AA AL Figure 84: C-D (HGM) *35 *22.5 - - 17.5° Shape — Dextral, campaniliform shell with high spire and moderately convex whorls. Top of convexity corresponds to periphery. Hardly visible angulation at outer edge of base, accentuated by carina. Parietal and columellar lips covered by thin callus. Sculpture — Whorls and base divided by deep spiral grooves, crossed by opisthocyrt growth lines and strong, periodically repeated, more or less collabral ribs or wrinkles on whorls. Ribs characterise younger whorls, but their shape changes into flattened, wide ridge or undulation on later whorls. They run from suture to suture or to carina, bordering the base on last whorl. Growth lines orthocline on base. Remarks — The Bakony Mts specimens, though they are rather poorly preserved, well identifiable. The figured fragmentary specimen well corresponds the latest growth phase of Pseudokatosira undulata (BENZ, 1832) as interpreted by NÜTZEL & GRÜNDEL (2007). The juvenile shell of P undulata is very similar to Katosira periniana (D'ORBIGNY, 1853); some authors (e. g. STOLICZKA 1861) unified the two species. However, the Bakony Mts specimens justify that the two species are distinguishable; the whorls of K periniana (D'ORBIGNY, 1853) remain flattened in that growth stage in which the convexity of the whorls in P. undulata increase. Simultaneously, the ribs weaken in K periniana, while strengthen in P. undulata. No specimen has been found in the Hierlatz Alpe material that would be really identical with Pseudokatosira undulata (BENZ, 1832). With its considerably slimmer shell, the specimen, inferably figured by STOLICZKA. (1861) as "Chemnitzja undulata', and some other shell fragments most probably represent another species. Distribution — South Germany, Pliensbachian; Bakony Mts, Pliensbachian. Pseudokatosira? aff. undulata (BENZ, 1832) (Figure 84: A-B, J-K) 1861: Chemnit^a undulata BENZ — STOLICZKA, p. 163, pl. 1, fig. 1. Material — GBa 2008/69/1/1-8 specimens. Measurements H HL HP GBa 2008/69/1/1 *25 *12 Remarks — The Hierlatz Alpe finds belong pardy to Katosira periniana and pardy to another species. The latter forms are similar in their habit to Pseudokatosira undulata but they differ in having much more slender shell of 10° (±1°) spiral angle. The smallest spiral angle values are 15—20°, measurable on the juvenile shell parts of P. undulata. The prominent shell morphology changes of the different growth phases, characterising P. undulata, are unrecognisable on the D W AA AL *10 *7 11° Hierlatz Alpe specimens. However, the habit of the earliest shell parts are really similar (Figure 84: J—K) and the presence of a mdimentary siphonal oudet is also inferable at the foot of columella. Therefore a comparative study of the specimens is necessary to reach the final taxonomical conclusions. The post-juvenile whorls of these shells are different from those of Katosira periniana in keeping their convexity on full length of the shell, fairly exceeding that size where