N, Victoria (Balcombian, Middle Miocene), 6 specimens, USNM M353581 and M353580. Distribution.

Truncatoflabellum They worth (additional proof for the irrationality of hyperbolic discounting will irregulare (Semper, 1872) Fig. Ryukyu Islands, Horseshoe Cliffs (26?0'00"N, 127?0'54"E), 55 m, 1 specimen, USNM 87710. Distribution. Philippines, Indonesia, Ryukyu Islands, 11-55 m.A important for the genera and species on the transversely-dividing Flabellidae...Figure four. A Truncatoflabellum macroeschara, paratype, USNM 96661, Onslow Island, Western Australia B T. veroni, paratype, USNM 96655, Soela 54A, Western Australia C T. gambierense, USNM 1295473, USGS 10809, Balcombe's Bay, Victoria (Balcombian = Middle Miocene) D T. irregulare, USNM 87713, Japan. Scale bars: all 10 mm.Stephen D. Cairns / ZooKeys 562: 1?8 (2016)Truncatoflabellum incrustatum Cairns, 1989b Fig. 5A Flabellum irregulare: Gerth 1921: 402, pl. 57, fig. 15.--Cairns 1989b: 63, Table six, pl. 37f. Truncatoflabellum incrustatum Cairns, 1989b: 68?9, Table six, pl. 35d .--Cairns and Zibrowius 1997: 168. New record. Tansei Maru KT9202-YT1, 30?4'48"N, 130?6'06"E, 80?8 m, five specimens, USNM 92788. Distribution. Decrease Miocene of Java (Gerth, 1921). Hat all agents might be reasonably anticipated to want irrespective of Holocene: Philippines; Indonesia; Ryukyu Islands, Japan, 30-315 m. Truncatoflabellum sphenodeum (Tenison-Woods, 1880), comb. n. Fig. 5B Flabellum sphenodeum Tenison-Woods, 1880: 14, figs 12a-c.--?Hayward, 1977: 105106, fig. eight. ?Flabellum attenuatum Tenison-Woods, 1880: 15, fig. 15. Flabellum rubrum sphenodeum: Squires 1958: 66?7, pl. 11, figs 21?five (lectotype designated). ?Flabellum sp. A Hayward, 1977: 106, fig. 9. New record. Junction of Porter and Thomas Rivers, New Zealand, S66/74, NZGS 3350, Duntroonian (early Oligocene), 3 specimens, USNM 67908.N, Victoria (Balcombian, Middle Miocene), six specimens, USNM M353581 and M353580. Distribution. Middle Miocene: Mount Gambier, S. Australia; Cape Otway, Balcombe's Bay, Mornington, and Beaumaris, Victoria. Remarks. Inside the original description, Duncan (1864) described the species as not possessing thecal edge spines, but in 1870 stated that the coral has "often small spines nearer the calice than the pedicel." Indeed, some specimens of this distinctively-shaped species have spines (standard Truncatoflabellum) and others do not (see New Records). Ordinarily, if a species of Truncatoflabellum bears thecal edge spines then all specimens of that species will bear spines. Therefore, this variation journal.pone.0077579 in character is unusual and may be indicative from the early evolution inside the genus when spination and transverse division have been still experimental, as T. gambierense is 1 of these species that shows a crescentric transverse weakness in its corallum but the anthocyathus normally remains attached to the anthocaulus, possibly the ancestral situation for the species. Truncatoflabellum irregulare (Semper, 1872) Fig. 4D Flabellum irregulare Semper, 1872: 242?45, figs 1?, pl. 16, figs 7?7. Not Flabellum irregulare Tenison-Woods, 1878b: 313, pl. 4, Fig. two (junior homonym, = T. cumingi). Truncatoflabellum irregulare: Cairns 1989b: 67?8, Table 6, pls. 34i , 35a (synonymy). --Cairns and Zibrowius 1997: 168. New record. Ryukyu Islands, Horseshoe Cliffs (26?0'00"N, 127?0'54"E), 55 m, 1 specimen, USNM 87710. Distribution. Philippines, Indonesia, Ryukyu Islands, 11-55 m.A key towards the genera and species of the transversely-dividing Flabellidae...Figure four. A Truncatoflabellum macroeschara, paratype, USNM 96661, Onslow Island, Western Australia B T. veroni, paratype, USNM 96655, Soela 54A, Western Australia C T. gambierense, USNM 1295473, USGS 10809, Balcombe's Bay, Victoria (Balcombian = Middle Miocene) D T.