Jumudontus gananda Cooper, 1981

Zhen, Yong Yi, Percival, Ian G. & Webby, Barry D., 2003, Early Ordovician Conodonts from Far Western New South Wales, Australia, Records of the Australian Museum 55 (2), pp. 169-220 : 198

Jumudontus gananda Cooper, 1981

Fig. 18H–J

Jumudontus gananda Cooper, 1981: 170 , pl. 31, fig. 13.

Jumudontus gananda .– Nicoll, 1992: 216–223, figs. 4–8 (cum syn.).

Jumudontus gananda .– Pohler, 1994, pl. 3, figs. 15, 16.

New genus A n. sp. 1 s.f. Pohler, 1994: 42, pl. 7, fig. 29, text-fig. 15T,U (= S elements ).

New genus A n. sp. 2 s.f. Pohler, 1994: 42, pl. 7, figs. 27, 28, textfig. 15R,S (= Pb element).

New genus C n. sp. 1 s.f. Pohler, 1994: 43, pl. 7, fig. 26, text-fig. 15X (= Pb element).

Jumudontus gananda .–Johnston & Barnes, 2000, pl. 4, fig. 22.

Jumudontus gananda ?.–Zhen et al., in press: pl. 3, fig. 19 (cum syn.).

Material. Six specimens (all Pa) from the Tabita Formation at Mount Arrowsmith, and eleven specimens (10 Pa, 1 Pb) from unnamed dolomitic limestone unit at Koonenberry Gap .

Remarks. Jumudontus gananda was originally described ( Cooper, 1981) as a form species with only the Pa element recognized from the Horn Valley Siltstone of the Amadeus Basin. Nicoll (1992) revised the species as consisting of a septimembrate coniform-pectiniform apparatus, also based on a collection from the Horn Valley Siltstone, with a recovered element ratio of 60(Pa):21(Pb):2(M):1(Sa): 5(Sb): 3(Sc):8(Sd). In samples from western New South Wales, the species is comparatively rare, and only the more common Pa and Pb elements were recovered. Pohler (1994) briefly documented some Pb and S elements of this species, assigning them to three informal form species without knowledge of Nicoll’s (1992) revision.

Figures

Fig. 18. A–G, Erraticodon sp.A:A,B, Pb element,AMF120391, M/A7, A, anterior view, B, posterior view; C,D, Pa element,AMF120392, M/A7, C, posterior view, D, upper view; E, Sc? element, AMF120393, M/A7, outer lateral view; F,G, Sa element,AMF120394, M/A7, posterolateral views. H–J, Jumudontus gananda Cooper, 1981: H, Pa element, AMF120395, M/A4, lateral view; I, Pb element, AMF120397, C1611, basal lateral view; J, Pa element, AMF120396, C1611, lateral view. Scale bars 100 µm.