..............................32 Thecal edge angle 60?0? H:GCD = 0.7?.1; deep water (786?010 m) .... ....................................................................................... T. stabile (Fig.

B sensu Cairns, 1994 Western Australia angiostomum (Folkeson, 1919) australiensis Cairns, 1998 veroni Cairns, 1998 macroeschara Cairns, 1998 Western Indian Ocean/S. Africa stabile (M...............................32 Thecal edge angle 60?0? H:GCD = 0.7?.1; deep water (786?010 m) .... ....................................................................................... T. stabile (Fig. 9B) Thecal edge angle 40?0? H:GCD =1.0?.five; shallow water (one hundred m) ........... ................................................................................ T. inconstans (Fig. 9C) Costae (C1?) ribbed; thecal edge angle 45?0?.......................................33 Costae not ribbed; thecal edge angle less than 20? fossil from New Zealand .... ....................................................................................+T. corbicula (Fig. 9D) H:GCD = 0.9?.two; C1? ribbed; southeastern Pacific ....T. truncum (Fig. bmjopen-2015-010112 10A) H:GCD = 0.7; C1? ribbed; mid-Pacific ......................... T. trapezoideum Septal symmetry in multiples of 20 (e.g., 20: 20: 20: 80) .............................. ............................................................................... T. formosum (Fig. 10B) Septal symmetry hexameral in four to 5 order Win 63843 cycles ......................................35 5 cycles of septa and part of sixth; H:GCD bmjopen-2015-010112 10A) H:GCD = 0.7; C1? ribbed; mid-Pacific ......................... T. trapezoideum Septal symmetry in multiples of 20 (e.g., 20: 20: 20: 80) .............................. .............................................................................................................32 Thecal edge angle 60?0? H:GCD = 0.7?.1; deep water (786?010 m) .... ....................................................................................... T. stabile (Fig. 9B) Thecal edge angle 40?0? H:GCD =1.0?.5; shallow water (100 m) ........... ................................................................................ T. inconstans (Fig. 9C) Costae (C1?) ribbed; thecal edge angle 45?0?.......................................33 Costae not ribbed; thecal edge angle less than 20? fossil from New Zealand .... ....................................................................................+T. corbicula (Fig. 9D) H:GCD = 0.9?.2; C1? ribbed; southeastern Pacific ....T. truncum (Fig. bmjopen-2015-010112 10A) H:GCD = 0.7; C1? ribbed; mid-Pacific ......................... T. trapezoideum Septal symmetry in multiples of 20 (e.g., 20: 20: 20: 80) .............................. ............................................................................... T. formosum (Fig. 10B) Septal symmetry hexameral in 4 to 5 cycles ......................................35 Five cycles of septa and part of sixth; H:GCD 1.3 .................................36 H:GCD = 1.three?.9; GCD:LCD = 1.3?.five ...............T. gardineri (Fig. 10D) H:GCD = 2.9?.five; GCD:LCD = 1.eight?.6 ...............T. arcuatum (Fig. 11A)Stephen D. Cairns / ZooKeys 562: 1?eight (2016)Table 1. Transversely dividing flabellids, arranged by predominant geographic region (+ = fossil). Philippines and Indonesia Truncatoflabellum Cairns, 1989 (38 spp, like six exclusively fossil) compressum (Lamarck, 1816) =stokesii (Milne Edwards Haime, 1848) =Flabellum oweni Milne Edwards Haime, 1848 spheniscus (Dana, 1846) =Flabellum debile Milne Edwards Haime, 1848 =Flabellum affine Milne Edwards Haime, 1848 =Flabellum bairdi Milne Edwards Haime, 1848 =Flabellum profundum Milne Edwards Haime, 1848 =Flabellum sumatrense Milne Edwards Haime, 1848 =Flabellum crenulatum Milne Edwards Haime, 1848 =Flabellum elongatum Milne Edwards Haime, 1848 =+variabile sensu Gerth, 1921 (new synonymy) aculeatum (Milne Edwards Haime, 1848) =?Flabellum spinosum Milne Edwards Haime, 1848 =?Flabellum variabile Semper, 1872 crassum (Milne Edwards Haime, 1848) candeanum (Milne Edwards Haime, 1848) =Flabellum elegans Milne Edwards Haime, 1848 cumingi (Milne Edwards Haime, 1848) =F.