Procymaclymenia ebbighauseni, Klein & Korn, 2014

Klein, C. & Korn, D., 2014, A morphometric approach to conch ontogeny of Cymaclymenia and related genera (Ammonoidea, Late Devonian), Fossil Record 17 (1), pp. 1-32 : 11-12

publication ID	https://doi.org/ 10.5194/fr-17-1-2014
DOI	https://doi.org/10.5281/zenodo.10997804
persistent identifier	https://treatment.plazi.org/id/4D1287FB-CB3A-FFDE-FCD7-3297FB36FA9C
treatment provided by	Felipe
scientific name	Procymaclymenia ebbighauseni
status	sp. nov.

Treatment

Procymaclymenia ebbighauseni View in CoL n. sp.

Figures 11 View Figure 11 and 12 View Figure 12

1960 Cymaclymenia striata . – Petter, p. 47, pl. 8, figs. 3, 5, 11, 14. 1999 Cymaclymenia sp. – Korn, p. 170, pl. 4, fig. 6.

2002 Cymaclymenia pudica . – Becker et al., p. 171, pl. 4, figs. 4, 5.

Derivation of name: In honour of Volker Ebbighausen (1940–2011), for his contribution to the palaeontology of the Anti-Atlas of Morocco.

Holotype: Specimen MB.C.22621.1 (Ebbighausen and Korn 2009 Coll.); illustrated here in Fig. 11b View Figure 11 .

Type locality and horizon: Madène el Mrakib (Anti-Atlas); Procymaclymenia beds (late Famennian).

Material: 252 specimens with a maximum conch diameter of 45 mm.

Diagnosis: Species of Procymaclymenia with thinly discoidal conch in the adult stage (ww / dm = 0.28); whorl cross section compressed (ww / wh = 0.60). Conch shape in the intermediate stage (10 mm dm) thinly discoidal and subevolute (ww / dm = 0.30; uw / dm = 0.32). Umbilical wall steep in the adult stage, flanks subparallel, venter rounded or slightly flattened and separated from the flanks by a subangular margin. Ornament with very fine biconvex growth lines, steinkern without constrictions.

Discussion: Procymaclymenia ebbighauseni differs from P. inflata ( Czarnocki, 1989) and P. pudica ( Czarnocki, 1989) from the Holy Cross Mountains in the smooth steinkern, which in the other two species displays strong constrictions. Furthermore, the other two species possess riblets around the umbilicus, which are very faint in P. ebbighauseni .

The new species was utilised by Becker et al. (2002) as an index for the “ Cymaclymenia pudica Zone ”, which has a position between the “ Platyclymenia annulata Zone ” and the “ Sporadoceras orbiculare Zone ”. The authors provide a list of co-occurring species, predominantly platyclymeniids and prionoceratids. Recent bed-by-bed research, however, has demonstrated that Procymaclymenia ebbighauseni occurs higher in the section than postulated by Becker et al. (2002); a co-occurrence of typical species of the Platyclymenia annulata Zone and P. ebbighauseni does not exist. In the section at Madène el Mrakib, P. ebbighauseni has its lowest occurrences immediately below the oldest horizon with “ Sporadoceras orbiculare ”.