. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 34. Olcostephanus {Olcostephanus) atherstoni (Sharpe) (3). The holotype of Rogersites tenuicostatus Imlay from the Taraises Formation of northern Mexico (after Imlay 1937). x 1. and with reservation O. curacoensis (Weaver) and O. sublaevis Spath. The microconch is taken to be represented by the synonymous species O. psilostomus Neumayr & Uhlig, O. wilmanae (Kitchin), and O. midas (Leanza). Moreover, these authors hint that O. otoitoides (Spath), O. wynnei Spath, O. baini (Sharpe), O. baini v
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 34. Olcostephanus {Olcostephanus) atherstoni (Sharpe) (3). The holotype of Rogersites tenuicostatus Imlay from the Taraises Formation of northern Mexico (after Imlay 1937). x 1. and with reservation O. curacoensis (Weaver) and O. sublaevis Spath. The microconch is taken to be represented by the synonymous species O. psilostomus Neumayr & Uhlig, O. wilmanae (Kitchin), and O. midas (Leanza). Moreover, these authors hint that O. otoitoides (Spath), O. wynnei Spath, O. baini (Sharpe), O. baini var. ambikyi (Besairie), O. auritus (Leanza), O. salinarius Spath, O. sphaeroidalis (Spath), O. glaucus Spath, O. rigidus (Baumberger), O. lepto- planus (Baumberger), O. imbricatus (Baumberger), and O. modderensis (Kitchin) were a group of doubtfully distinct species over which O. atherstoni had priority. These authors have, however, been misled both by the convergence between macroconch forms, and in neglecting the specific importance of parabolic constrictions. The microconch is represented, amongst South African material, by O. otoitoides (Spath) (Fig. 30), the crushed O. wilmanae (Kitchin) (Fig. 32) and the specimen figured by Spath (1930) as Rogersites aff. wilmanae (Fig. 33). Other synonyms certainly include O. tenuicostatus (Imlay) (Fig. 34), O. prorsi- radiatus (Imlay) (Fig. 35), and O. neoleonensis (Cantu Chapa) (Fig. 36), the latter species based upon the inner whorls of O. prorsiradiatus, as well as O. psilostomus (Pictet) (Fig. 37), O. midas (Leanza) (Fig. 38), O. leptoplanus (Baumberger) (Fig. 39), of which Astieria psilostoma var. picteti Wegner (1909) is a junior objective synonym, and possibly O. curacoensis (Weaver) (Fig. 40). Astieria sudandina Windhausen (1931) (Fig. 41) was based upon a specimen illustrated only in lateral view, without scale, description or locality, and is thus a nomen nudum. According to Riccardi et ah (1971), it is a synonym of O. atherst
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