Frydiella kaimi, Krawczyński, 2006

Krawczyński, Wojciech, 2006, Gastropod succession across the Early-Middle Frasnian transition in the Holy Cross Mountains, southern Poland, Acta Palaeontologica Polonica 51 (4), pp. 679-693 : 689

Frydiella kaimi gen. et sp. nov.

Fig. 4A–C .

Holotype: GIUS 4−1136 Jaź−31 ( Fig. 4A ).

Type locality: Active quarry “Jaźwica” near Kielce, Holy Cross Mountains, Poland.

Type horizon: Kadzielnia Member, Early Frasnian (Late Devonian).

Derivation of the name: In honour of Dr.Andrzej Kaim—Mesozoic gastropod specialist from Warsaw ( Poland).

Material.—Two near−complete shells, a single fragment, and a single mould of external shell surface (GIUS 4−1135 Jaź−30, 4−1136 Jaź−31, 4−1137 Jaź−32, 4−1168 Sn−1).

Diagnosis. —Convex subsutural ramp with three tubercle spiral cords one of which is weaker below the upper suture. There are six nodular spiral cords on the anomphalous base.

Description. —Shell small, dextral and turbiniform of moderate whorl height, consisting of five whorls (size of the holotype: height 6.4 mm, width 5.5 mm), convex ramp, ornamentation on ramp consists of three strong spiral cords, and counting from the upper suture, the second and third of these strongly protrude. Prosocline growth lines cross spiral cords and form small tubercles at cross points. Base slightly flattened, anomphalous with six distinct spiral cords and tubercles appearing as a result of crossing with growth lines. Aperture with a shallow slit in the middle of the outer lip; this slit forms a rather wide selenizone which protrudes slightly above the surface of the whorl. The selenizone is also delimited by two spiral cords and shows an additional less distinct spiral thread in the center. The inner lip is weakly thickened and poorly preserved. Sutures are deep and slightly grooved, the lower being situated just below the first spiral cord under the selenizone. Protoconch poorly preserved. Pleural angle is 68 °.

Discussion.— Frydiella kaimi sp. nov. is a rare, probably endemic, species encountered in the Euryzone kielcensis association within the the Kadzielnia−type mud mound assemblage (see Szulczewski and Racki 1981).

Occurrence. — At the type locality, Jaźwica (the Kadzielnia Member, set J; Early Frasnian) and in marly limestones at Sosnówka ( Phlogoiderhynchus Level, set D) in Holy Cross Mountains, Poland (the bottom of Phlogoiderhynchus Level at Sosnówka is probably Early Frasnian in age; see Pisarzowska et al. 2006: fig. 16).

Figures

Fig. 4. Early Frasnian Eotomarioidea and Porcellioidea (Vetigastropoda) from the Holy Cross Mountains. A–C. Frydiella kaimi gen. et sp. nov., Jaźwica quarry (set J). A. Holotype, GIUS 4−1136 Jaź−31, lateral view. B. GIUS 4−1137 Jaź−32, apertural (B1), lateral (B2), and basal (B3) views of shell. C. GIUS 4−1135 Jaź−30, fragment of last whorl with well preserved ornamentation. D, E. Lahnospira taeniata (Goldfuss, 1844), Kostomłoty II (Małe Górki) quarry (set B3). D. GIUS 4−2282 Kos−12, apertural view of pyritised shell. E. GIUS 4−2277 Kos−7, lateral view of pyritised shell. F–H. Euryzone delphinuloides (Schlotheim, 1820). F, G. GIUS 4−1237 Ko−24 (F) and GIUS 4−1239 Ko−26 (G), Kowala quarry (set A), lateral views of shells. H. GIUS 4−1637 Jaź−119, Jaźwica quarry (set J), apical (H1) and lateral (H2) views of shell. I–K. Porcellia bifida (Sandberger and Sandberger, 1856), Jaźwica quarry (set J). I, J. GIUS 4−1629 Jaź−111 (I) and GIUS 4−1628 Jaź−110 (J), apical views of shells. K. GIUS 4−1140 Jaź−35, apical (K1) and lateral (K2) views of shell. L, M. Euryzone kielcensis (Gürich, 1896). L. GIUS 4−1467 Kd−3, Kadzielnia (set A), lateral views of neotype shell. M. GIUS 4−1134 Jaź−29, Jaźwica quarry (set J), lateral view of juvenile shell.