Synopsis of ‘ onychocellid’ cheilostome bryozoan genera Author Taylor, Paul D. Author Martha, Silviu O. Author Gordon, Dennis P. text Journal of Natural History 2018 J. Nat. Hist. 2018-07-03 52 25 - 26 1657 1721 http://dx.doi.org/10.1080/00222933.2018.1481235 journal article 10.1080/00222933.2018.1481235 1464-5262 4747141 63A31AD2-F049-42CB-A45B-557014DC286E Genus Dictuonia Jullien, 1882 ( Figure 7 ) Type species Eschara aceste d’ Orbigny, 1851 , by subsequent designation. Late Cretaceous, France . Jullien (1882) listed nine Cretaceous species, all named by d’ Orbigny, in his new genus Dictuonia but did not chose a type species. This appears to have been left to Bassler (1935 , p. 93). Unfortunately, d’ Orbigny’ s type material of Dictuonia aceste is missing ( Gordon and Taylor 2005 , table 2). According to Prud’ Homme (1968 , p. 216), D. aceste is synonymous with Eschara danae d’ Orbigny, 1851 , the type material of which is in existence and which is one of the nine species listed by Jullien (1882) in Dictuonia . Therefore, the diagnosis of Dictuonia given below is based on the type material of Dictuonia danae (d’ Orbigny, 1851) from the ‘Senonian’ of Tours, Indre-et-Loire, France . Diagnosis Colony erect, bifoliate, branches palmate (‘adeoniform’) ( Figure 7 (a,e)). Autozooids hexagonal or diamond shaped; zooidal boundaries raised ( Figure 7 (b)). Cryptocyst extensive, depressed. Gymnocyst lacking. Opesia subterminal, occupying about half of the frontal surface; subcircular or longitudinally elliptical, lacking opesiular indentations and lateral constrictions. Ovicells unknown. Avicularia vicarious, asymmetrical ( Figure 7 (c)), about half the width of an autozooid; opesia longitudinally elliptical; rostrum acutely triangular, floor smooth, deep. Figure 7. Dictuonia danae (d ’ Orbigny); Syntypes, MNHN R61520; Late Cretaceous, ‘ Senonian ’ , Tours, Indre-et-Loire, France. (a) Bifoliate branch; (b) autozooids; (c) avicularium. (d) autozooids from another branch; (e) overall view of the same branch. Scale bars: a, e = 1 mm; b, c = 200 µm; d = 500 µm. Remarks Like Collura , the genus Dictuonia has been neglected. Notwithstanding the loss of d’ Orbigny’ s type material of the type species, based on the characters of the putative synonym D. danae there is utility in resurrecting the genus for onychocellids with rounded autozooidal opesiae that contrast with those of other onychocellids – such as Onychocella , Aechmella and Smittipora – in which the opesiae have a distinct proximal edge that is straight or gently curved. Range Late Cretaceous.