Notes on some sertulariid hydroids (Cnidaria: Hydrozoa) from the tropical western Pacific, with descriptions of nine new species Author Galea, Horia R. text European Journal of Taxonomy 2016 2016-08-02 218 1 52 journal article 21896 10.5852/ejt.2016.218 cba502b0-cc06-4252-94f1-3eda754e8183 2118-9773 3840195 A4D7AA38-D18F-4604-A5E0-D965637BD9F8 Dynamena heterodonta ( Jarvis, 1922 ) Fig. 1 L–O Pasythea heterodonta Jarvis, 1922: 344 , pl. 24, figs 11–12. Dynamena heterodonta – Billard 1925b: 198 , fig. 44. ― Redier 1966: 86 . ― Vervoort & Vasseur 1977: 36 , figs 16–17. Sertularia gracilis – Billard 1905: 334 (not Sertularia gracilis Hassall, 1848: 2223 ). non Dynamena quadridentata f. heterodonta – Vannucci 1951a: 83 ; 1951b: 108 , 112, 114 [= D. quadridentata (Ellis & Solander, 1786) ]. Material examined MUSORSTOM 9: Stn. DW1204, small colony composed of four infertile stems, 6–12 cm high, detached from substrate (MNHN-IK-2012-16517); Stn. DW1265, sterile colony with stems up to 2.6 cm high, epizoic on Synthecium sp. (MNHN-IK-2012-16518). Remarks The sterile, unbranched stems, divided here and there by oblique nodes, each of which comprises a varied number of isolated hydrothecal pairs, occasionally forming apically stacked groups of two, the lack of evidence of an abcauline caecum in retracted hydranths, the two-cusped hydrothecae with a pleated adcauline flap and a semicircular abcauline flap, and the inconstant presence of internal, submarginal cusps in the hydrothecae suggest that they belong, with little doubt, to Jarvis’ (1922) species. Vervoort & Vasseur (1977) provided a reexamination of the type material, as well as a discussion regarding its differences with D. quadridentata (Ellis & Solander, 1786) . Geographical distribution St. Brandon (Cargados Carajos) ( Jarvis 1922 ), Indonesia ( Billard 1925b ), New Caledonia ( Redier 1966 ), French Polynesia [ Billard (1905) , as Sertularia gracilis Hassall, 1848 ; Vervoort & Vasseur (1977) ; present study].