Coleiconus minimus Babazadeh, 2022

Mehdi Hadi, Mehdi & Schlagintweit, Felix, 2024, Comments On “ New Biostratigraphy And Microfacies Analysis Of Eocene Jahrum Formation (Shahrekord Region, High Zagros, West Iran). A Carbonate Platform Within The Neo-Tethys Oceanic Realm ” By Babazadeh And Cluzel [Bsgf (2023)], Acta Palaeontologica Romaniae 20 (2), pp. 17-24 : 22

Coleiconus minimus Babazadeh, 2022

These small sized conical forms have been assigned to Coleiconus Hottinger & Drobne, 1980 ( Fig. 3 L-N). The said pseudo-keriothecal wall is not illustrated or discernible in the illustrations provided by Babazadeh (2022). Instead, the specimens of ‘ Coleiconus minimus ’ can be well compared with Daviesiconus balsilliei (Davies, 1930) , from the Eocene of Pakistan, typically the smaller juvenile forms ( Fig. 3 O-S). The only illustrated transverse section provided by Babazadeh (2022, fig. 9E) cuts the cone through its early ontogenetic stage ( Fig. 3N comparable to section 3S by Hottinger & Drobne, 1980, pl. 17, fig. 16). In conclusion, C. minimus is considered as an invalid species, inadequately distinguished from allied forms and might be referable to small specimens of D. balsilliei that has besides been described by Babazadeh (2022) from the same material.

Figures

Fig. 3. Taxonomic considerations on Daviesiconus mahallatensis Babazadeh, 2022 (A), Barattolites arghadehensis Babazadeh, 2022 (B-C, E-F and interpretation in D), and Coleiconus minimus Babazadeh, 2022 (L- N); comparisons with Coskinolina sistanensis Schlagintweit & Hadi, 2018 (G-K) and Daviesiconus balsilliei (Davies, 1930) (O-S). From Babazadeh (2022): A. (fig. 6A), B. (fig. 6C), C. (fig. 8D-E), F. (fig. 8E), L (fig. 9B), M (fig. 9I), N (fig. 9E). From Schlagintweit & Hadi (2018): G. (fig. 4d), I. (fig. 5c); J. and K. (unpublished). From Hottinger & Drobne (1980): O. (pl. 17, fig. 5), P. (pl. 17, fig. 10), Q. (pl. 17, fig. 3), R. (pl. 17, fig. 22), S (pl. 17, fig. 16). Abbreviations: b = beam; ch = chamber; cp = continuous pillars; lsc = last spiral chamber; ma = marginal aperture; mr = marginal rim; p = pillar; s = septum; f = foramen; ss = spiral suture; ib = intercalary beams.