Aphelaeceras Hyatt, 1884

Korn, Dieter & Bockwinkel, Jürgen, 2022, Early Carboniferous nautiloids from the Central Sahara, southern Algeria, European Journal of Taxonomy 831, pp. 67-108 : 97

Genus Aphelaeceras Hyatt, 1884

Type species

Nautilus (Discites) disciformis Meek & Worthen, 1873 ; subsequent designation by Miller & Garner (1953).

Diagnosis

Genus of the family Trigonoceratidae with subevolute to evolute conch; whorls slightly impressed; whorl profile compressed, venter concave and bordered by an angular ventrolateral shoulder, flanks convex, convergent; umbilical margin rounded or subangular. Suture line with shallow external and lateral lobes. Siphuncle small with subcentral position (after Kummel 1964; emended).

Included species

Nautilus (Discites) disciformis Meek & Worthen, 1873 , Illinois; Nautilus (Discites) mutabilis M’Coy, 1844 , Ireland; Nautilus (Discites) trochlea M’Coy, 1844 , Ireland; Aphelaeceras arkansanum Gordon, 1965 , Arkansas; Nautilus difficilis de Koninck, 1878 , Belgium; Nautilus discoideus de Koninck, 1878 , Belgium; Nautilus exaratus de Koninck, 1878 , Belgium; Discitoceras discus Sowerby, 1813 , Ireland; Discites Hibernicus Foord & Crick, 1893, Ireland; Aphelaeceras azzelmattiense sp. nov., Algeria.