Sely-dividing flabellids consist of five genera (Truncatoflabellum, Placotrochides, Blastotrochus, Placotrochus, and

A tabular key can also be supplied for the 38 species of Truncatoflabellum. Two new combinations are suggested (T. gambierense and T. sphenodeum) and two new species are described (T. duncani and T. mozambiquensis). All but a single species are illustrated and accompanied by their identified distribution and a guide for the pertinent literature for the species. New records of 19 of the 45 species are listed. The transversely-dividing flabellids variety in the Middle Eocene towards the Recent at depths of 2?010 m, and constitute 60 of the 65 recognized extant species of transversely-dividing Scleractinia. Key phrases Flabellidae, Truncatoflabellum, Placotrochides, Blastotrochus, Placotrochus, Falcatoflabellum, transversely dividing, crucial, asexual reproductionCopyright Stephen D. Cairns. This is an open access report distributed beneath the terms with the Inventive Commons Attribution License (CC BY four.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and supply are credited.Stephen D. Cairns / ZooKeys 562: 1?eight (2016)Introduction Confronted using a large collection of Truncatoflabellum through a current (2014) trip to Taiwan, it became apparent that the literature around the species of this genus was scattered and not well organized. Though there have been some keys for the species, they had been regional in nature, i.e., Philippine region (Cairns 1989b), southwest Indian Ocean (Cairns and Keller 1993), North Pacific (Cairns 1994), and Western Australia (Cairns 1998). No unified important or comparative table existed to update that of Cairns (1989b). Truncatoflabellum may be the seventh largest Holocene genus among the approximately 240 living scleractinian genera, and thus a key for the species and guide to the pertinent literature was thought suitable. (Essentially the most specious Holocene scleractinian genera are (Hoeksema and Cairns 2015): Acropora ?about 120 living species, Caryophyllia ?75 species, Balanophyllia ?59 species, Montipora ?about 56 species, Flabellum ?42 species, Porites ?about 41 species, and after that Truncatoflabellum, with 32 living species). The four other truncate flabellid genera are incorporated for completeness: Blastotrochus, Placotrochides, Placotrochus, and Falcatoflabellum. Of the 120 living azooxanthellate genera (Roberts et al. 2009), 17 of them (14.two on the genera) and 65 from the roughly 725 azooxanthellate species (or 9.0 with the species) represent transverselydividing species: i.e., the five flabellid genera previously N the cryptic groups in the Gut Mountains and fromTaxonomic revision listed and: Anthemiphyllia (in component), Australocyathus, Bourneotrochus, Caryophyllia (in portion), Dunocyathus, Endopachys, Idiotrochus, Kionotrochus, Notophyllia, Peponocyathus, Trochocyathus (in aspect), and Truncatoguynia. Fossil Truncatoflabellum: Because of the very easily diagnosed aspect from the anthocyathus basal scar, fossil Truncatoflabellum are conveniently distinguished, although most have already been attributed for the genus Flabellum. Most fossil flabellids can't be correlated to Recent species, journal.pone.0174109 but on the other hand, several have been described as discrete species. The earliest fpsyg.2015.00334 record of a transversely-dividing fossil flabellid was that of Duncan (1864), who reported 3 truncate species f.Sely-dividing flabellids consist of five genera (Truncatoflabellum, Placotrochides, Blastotrochus, Placotrochus, and Falcatoflabellum) and 45 species. A dichotomous key is supplied for these 5 genera at the same time as the species of your genus Truncatoflabellum and Placotrochides, the other 3 genera becoming monotypic. A tabular essential is also supplied for the 38 species of Truncatoflabellum. Two new combinations are recommended (T. gambierense and T. sphenodeum) and two new species are described (T.