Avignathus bifurcatus, 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 : 604-605

Avignathus bifurcatus sp. nov.

Fig. 21N–S.

Holotype: S 0 (tr) element ZPAL CXVI/1145 ( Fig. 21Q).

Type horizon and locality: Lower cephalopod limestone at Płucki sample Pł−22, Holy Cross Mountains, Poland, late Frasnian.

Derivation of the name: Referring to the bifid appearance of the medial process of symmetrical elements.

Diagnosis.—The medial process of the symmetrical process of the apparatus almost completely reduced distally of the base of dorsal (“posterior”) lateral processes.

Distribution.—Late Frasnian of the Holy Cross Mountains (see Table 4 and Fig. 4 ).

Figures

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.