Dyminodina planidentata, Dzik, 2002

Dzik, Jerzy, 2002, Emergence and collapse of the Frasnian conodont and ammonoid communities in the Holy Cross Mountains, Poland, Acta Palaeontologica Polonica 47 (4), pp. 565-650 : 600

Dyminodina planidentata sp. nov.

Fig. 9A–G .

Holotype: M (ne) element ZPAL CXVI/606 ( Fig. 9G ).

Type horizon and locality: Sample Pł−22 from the lower cephalopod limestone at Płucki in the Holy Cross Mountains, Poland, late Frasnian.

Derivation of the name: Referring to the flat denticulation of elements.

Diagnosis.—Generally albid denticles, M (ne) element with gentle, parabolic outline of the smooth outer process and short inner process with fan−like arrangement of denticles (“cyrtoniodus” morphology).

Distribution.—Late Frasnian (see Table 2 and Fig. 4 ).

Figures

Fig. 9. The prioniodinid Dyminodina gen. nov. from the Frasnian of the Holy Cross Mountains. A–I, O–Q. Dyminodina planidentata sp. nov. A–I. Lower cephalopod limestone at Płucki population (sample Pł−22), P1 (sp) element ZPAL CXVI/598 (A), P2 (oz) element ZPAL CXVI/599 (B), S0 (tr) element ZPAL CXVI/601 (C), S2 (pl) element ZPAL CXVI/604 (D), S1 (lo) element ZPAL CXVI/602 (E), S4 (hi) element ZPAL CXVI/603 (F), and M (ne) element ZPAL CXVI/606 (G; holotype). O–Q. Early Frasnian population from Wietrznia (sample Wtr−5), S4 element ZPAL CXVI/712 (P), and M (ne) element ZPAL CXVI/713 (Q). H–J. Dyminodina anterodenticulata sp. nov. from the Upper Kellwasserkalk at Płucki (sample Pł−391), P1 element ZPAL CXVI/391 (H), M (ne) elements ZPAL CXVI/390 (I; holotype), and P2 element ZPAL CXVI/402 (J). K–Q. Dyminodina kovalensis sp. nov. from the topmost Frasnian at the Kowala Quarry, sample Ko−151, P1 element ZPAL CXVI/1191 (K), P2 element ZPAL CXVI/1192 (L), S4 (hi) element ZPAL CXVI/1196 (M), S2 element ZPAL CXVI/1194 (N), S0 (tr) element ZPAL CXVI/1193 (O), S2 (pl) element ZPAL CXVI/1195 (P), M element ZPAL CXVI/ 1197 (Q; holotype).

Fig. 4. Correlation of studied sections of the Frasnian in the Holy Cross Mountains, Poland and position of conodont samples and ammonoid−bearing horizons. Note that the complete section of the Płucki main trench (extreme left) is drawn in different scale; samples between Pł−25 and Pł−18 come from small trenches. Above is a map of the Wietrznia quarries with locations of the sampled sections; the basal part of the section, with Ancyrodella soluta, has not been sampled because of low frequency of conodont elements (see Racki 1993); provisional zonation based on other Ancyrodella species is shown. Kowala section was measured at the eastern end of the quarry, the highest exploitation level. A. Wietrznia 1d of Racki et al. (1993; Racki and Bultynck 1993). B. Wietrznia 1e. C. Wietrznia block D of Szulczewski (1989). D. Wietrznia II.