Wortheniopsis bakonyensis, Szabó, 2016

Szabó, János, 2016, Gastropods of the Lower Jurassic Hierlatz Limestone Formation, part 2. Some new archaic type slit-bearing components from the fauna of the Hierlatz Alpe (Hallstatt, Austria) and the Bakony Mts (Hungary), Fragmenta Palaeontologica Hungarica 33, pp. 3-30 : 12-13

Wortheniopsis bakonyensis n. sp.

( Figs 11–14 )

2009 Wortheniopsis (Wortheniopsis) aff. procera (J. A. Eudes-Deslongchamps, 1849) – SZABÓ, p. 29, Fig. 22 .

Type specimen – GGIH J.08.3.1.

Type locality – Csárdahegy , Úrkút, Bakony Mts ( Hungary).

Type strata – Lower ? Sinemurian (Lower Jurassic) Hierlatz Limestone variety with relatively rich micrite content .

Derivation of name – Referring to the wider surroundings of the locality, the Bakony Mts.

Material – Single specimen that consists of three partial whorls; the earliest whorls and the near-peristome parts are fully lacking.

Dimensions – Width: 14 mm; spiral angle: 50°.

Diagnosis – Ramp flat and steep, outer face concave; earlier whorls rounded-angular above suture, last whorl evenly rounded toward base. Concave selenizone between two sharp ridges, abapical one just overlapping angulation of whorl surface. Base subconoidal as a whole with slightly convex wall; moderately broad umbilicus with rounded-angular rim. Umbilical lip seeming subvertical. Spiral ornament on full shell surface, excepting selenizone, threads on ramp, quirinii type ridges on outer face and base, all finely granulated even within umbilicus. Collabral threads observable on ramp.

Description – The shell is high turbiniform, extremely thin walled with slightly convex whorls that have an angulation above the midwhorl. The ramp is feebly concave on the earlier whorls but flat on the last whorl. The selenizone is slightly protruding from its environs and it is fairly concave on all whorls; its position is on the ramp just along the angulation. Abapically, a concave outer whorl face limits the selenizone, which is wider than the ramp and rounded-angular above the suture; this angulation is more marked on the earlier whorls and widely rounded, practically absent on the last whorl. The suture appears deeply impressed since it is built somewhat adaxially from the periphery of the whorls. The base is subconoidal with slightly convex wall and a moderately wide umbilicus, having a rounded-angular rim. Remnants suggest subaxial orientation of the umbilical lip and no trace of the parietal lip has been found; no more information, concerning the peristome is preserved.

All whorls are covered by spiral ornament, except the selenizone. It consists of spiral threads on the ramp and quirinii type ridges on the outer face and the base. Weak collabral threads are observable on the ramp and the outer face of the earliest whorl with granules at the crossings with the spiral threads. The collabral threads of the ramp are vanishing only on the last whorl but lacking already from the outer face of the penultimate whorl. However, the granules remain present also on the spiral threads and ridges of the latest shell parts, even on the base and within the umbilicus. The growth lines and the collabral ornament are feebly prosocline and clearly prosocyrt on both sides along the selenizone. The growth lines of the base are nearly orthocline and somewhat opisthocyrt.

Remarks – Granules of the spiral ridges on the base are almost fully removed by erosion, however some remnants indicate in strong magnification that they are present on all ridges.

Wortheniopsis bakonyensis n. sp. differs from W. rakusi n. sp. in having the angulation of the whorl surface from a much earlier growth stage; i. e. all whorls (3) are angulated in W. bakonyensis but only the last one in W. rakusi . It means also that a ramp has developed only on the last whorl of W. rakusi while in W. bakonyensis it is present (at least) two whorls earlier. W. bakonyensis has feebly concave outer face on all preserved whorls but W. rakusi has flat outer face on the last whorl and feebly convex corresponding belt on the former whorls. In W. rakusi , no granulation is present neither on the outer face nor on the base.

Distribution – Lower? Sinemurian Hierlatz Limestone, Csárdahegy, Úrkút, Bakony Mts, Hungary.

Figures

Figs 4–14.Wortheniopsisspecies fromtheHierlatz LimestoneFormation.– 4–10.Wortheniopsisrakusi n.sp.from the Sinemurian to lowermost Pliensbachian interval (Lower Jurassic) of the Hierlatz Limestone in the Hierlatz Alpe,Hallstatt, Austria,GBA 2017/001/0002,all ×4.– 4. Dorsal view.– 5. Peristomal view.– 6. Basal view. – 7–9. Same views as 4–6 but in natural (×1) size. – 10. Details of the ornament on thespire whorls,×7.– 11–14.Wortheniopsis bakonyensis n. sp.,?Lower Sinemurian (Lower Jurassic) Hierlatz Limestone variety with rich micrite content, Csárdahegy, Úrkút, Bakony Mts, Hungary, GGIH J.08.3.1. – 11. Peristomal view of the holotype, ×4. – 12. Lateral view to show the best preserved outline part, ×4.– 13–14. The same views as in figures 11–12 but in natural (×1) size

Figs 15–29. New species of Foveolaria n. gen. from the Sinemurian to lowermost Pliensbachian interval (Lower Jurassic) of the Hierlatz Limestone in the Hierlatz Alpe, Hallstatt, Austria. – 15–18. Holotype of Foveolaria bicarinata n. sp., GBA 2017/001/0003, all ×3.8. – 15. Dorsal view. – 16. Apical view. – 17. Basal view. – 18. Peristomal view. – 19–22. Holotype of Foveolaria conoidea n. sp., GBA 2017/001/0004, all ×4. – 19. Dorsal view. – 20. Apical view. – 21. Basal view. – 22. Peristomal view.– 23–26. Holotype of Foveolaria globosa n. sp., GBA 2017/001/0005, all ×4. – 23. Dorsal view. – 24. Apical view. – 25. Basal view. – 26. Peristomal view. – 27–29. Foveolaria sp., GBA 2017/001/0006, all ×4. – 27. Apertural view. – 28. Basal view. – 29. Dorsal view