Euryzone kielcensis ( Gürich, 1896 ) Krawczyński, 2002

Krawczyński, Wojciech, 2002, Frasnian gastropod synecology and bio-events in the Dyminy reef complex of the Holy Cross Mountains, Poland, Acta Palaeontologica Polonica 47 (2), pp. 267-288 : 274-276

Euryzone kielcensis ( Gürich, 1896) comb. nov.

Fig. 7I–L .

Polytropis kielcensis sp. nov.; Gürich 1896: 310.

Neotype: GIUS 4−1478 /Kad−3 ( Fig. 7I–K ).

Type horizon and locality: Kadzielnia in Kielce, set A—the biohermal Kadzielnia Member; middle Frasnian.

Material.—Two almost complete shells and two spire fragments ( ZPAL Ga−VI/28, 33; GIUS 4−1134/Jaź−29, 4−1478/ Kad−3).

Revised diagnosis.—Large−sized trochiform shell, narrowly phaneromphalous with a flattened base. Whorl profile with two distinctly rounded angulations: the first just below the suture and the second at the periphery. Asteep inclined ramp with wide selenizone at middle of whorl is present between the angulations. The species differs from E. delphinuloides by its distinctly higher spire.

Description.—The trochiform shell is large (measurements of neotype: height 55 mm, width 56.5 mm) and slightly gradate with 5–6 whorls. Surface of the whorl flattened near suture and below strongly bent to form a weak, convex angulation. The ramp below this angulation is strongly inclined and becomes flattened on the narrowly phaneromphalous base. Rounded periphery at the border of the ramp and base. The selenizone is wide, flat and gently concaves, not bordered by spiral threads at the middle of the whorl ramp. Sutures are canaliculate. Aperture rounded.

Ornamentation consists of spiral cords at ramp and base, but in gerontic stage consist only of growth lines. Growth lines are orthocline near suture and become prosocline below with a small sinus at the ramp above the selenizone. Growth lines below selenizone are opisthocline. Protoconch unknown. Pleural angle is 82°.

Remarks.—This species has been described by Gürich (1896) on the basis of specimens from Kadzielnia. However, its illustration is absent in the Gürich’s work. This is a relatively rare species,butacompletespecimenhasbeenfoundatthetypelocality. It has been designated as the neotype ( GIUS 4−1478/ Kad−3; Fig. 6F–H ).

Distribution.—Holy Cross Mountains: Kadzielnia, set Aand Jaźwica, set J (the Kadzielnia Member, early Frasnian).

Figures

Fig. 7. Euryzone kielcensis association of the Kadzielnia−type Assemblage from the Kadzielnia Member (middle Frasnian). A–C. Porcellia bifida (Sandberger and Sandberger, 1850–1856), Jaźwica, set J, × 4. A. Lateral view of shell, GIUS 4−1139/Jaź−34.B, C. Apertural and lateral view of shell, GIUS 4−1140/Jaź−35. D, E. Naticopsis (Naticopsis) inflata (Roemer, 1843), Kadzielnia, set A. D. Lateral view of shell with well preserved growth lines, ZPAL Ga−VI/30, × 2. E. Apertural view of shell with well preserved inductura, ZPAL Ga−VI/41, natural size. F. Roemeriella octocincta (Roemer, 1843), lateral view of shell, Jaźwica, set J, GIUS 4−1129/Jaź−24, × 3. G. Spanionema scalaroides (Whidborne, 1889), lateral view of shell with well preserved ornamentation, Kadzielnia, set A, GIUS 4−1193/Kad−1, × 2. H. Palaeozygopleura (Rhenozyga) cf. retrostriata (Kirchner, 1915), lateral view of spire with poorly preserved ornamentation, Jaźwica, set J, GIUS 4−1159/Jaź−54/1, × 4.5. I–L. Euryzone kielcensis (Gürich, 1896) comb. nov. I–K. Lateral views of shell with fragmentary preserved ornamentation, Kadzielnia, set A, GIUS 4−1478/Kad−3, neotype, natural size. L. Lateral view of juvenile shell, Jaźwica, set J, GIUS 4−1134/Jaź−29, × 5.

Fig. 6. Loxoplocus (Donaldiella) karczewskii sp. nov. from late Frasnian Detrital Beds, Panek, set B3. A, B. Fragments of spire with well preserved ornamentation. C–E. Spires with visible septation and unpreserved ornamentation. A. Holotype, GIUS 4−1293/Pan−21. B. GIUS 4−1287/Pan−15. C. GIUS 4−1288/Pan−16. D. GIUS 4−1292/Pan−20. E. GIUS 4−1301/Pan−29. A–C, E. × 2. D. × 1.7.