Platytrochus Milne Edwards & Haime, 1848

Baron-Szabo, Rosemarie C., 2008, Dendrophylliina, Caryophylliina, Fungiina, Microsolenina, and Stylinina, Zootaxa 1952, pp. 1-244 : 96

Genus Platytrochus Milne Edwards & Haime, 1848

(= Aldrichiella Vaughan, 1900 , Type species. Aldrichiella elegans Vaughan, 1900 , Upper Eocene [Jacksonian] of the USA);

(= Dominicotrochus Vaughan , in Vaughan & Hoffmeister, 1925, Type species. Dominicotrochus dominicensis Vaughan , in Vaughan & Hoffmeister, 1925, Middle Miocene of the Dominican Republic, Martinique);

(= Koilotrochus Tenison-Woods, 1878 , Type species. Koilotrochus vacuus Tenison-Woods, 1878 , Middle Miocene of Australia [Victoria])

Type species. Turbinolia stokesii Lea, 1833 , Middle Eocene of the USA (Claibornian) (subsequent designation Milne Edwards & Haime, 1850a).

Diagnosis. Solitary, corallum laterally compressed, often cuneiform, with calice elliptical in cross section and rarely more than 10 mm in diameter. Alate thecal edge costae may be present or absent. Costae smooth granular, type species having coarsely granular costae. Intercostae and thecal pits absent. Higher-cycle costae originate by trifurcation. Septa exsert, hexamerally arranged in 3–4 cycles, and in some cases (e.g. P. stokesii ) separated from their corresponding costae by notch at calicular edge. Pali and paliform lobes absent. Columella papillose, consisting of 2 or more rows of papillae.