New species and new records of hydroids (Cnidaria: Hydrozoa) from Chile Author Galea, Horia R. Author Schories, Dirk Author Försterra, Günter Author Häussermann, Verena text Zootaxa 2014 3852 1 1 50 journal article http://dx.doi.org/10.11646/zootaxa.3852.1.1 2fb83006-f93c-4492-aed0-f5f0707f553e 1175-5326 286956 7DE3BCBA-E5F0-4F0D-B2FD-B5B59E4DAE51 Symplectoscyphus sp. (Plate 3 E; Fig. 8 E–H) Material examined . HF 9 , Isla Magel, lat. - 54.92655 , long. - 67.41338 , 19 .xii.2010 , 6 m, sample C 281 : colony on seaweed, composed of several stems (up to 4.5 cm high) and smaller fragments, and a single gonotheca. Description . Colony 4.5 cm high, fan shaped, delicate (Pl. 3 E). Stems monosiphonic with a few annuli above origin from stolon, then regularly divided into oblique internodes by constrictions of the perisarc. Each internode with 3 alternate hydrothecae and a lateral apophysis given off from below the distalmost hydrotheca, the latter becoming axillar ( Fig. 8 E); presence of apophysis introduces a bent in the structure of the stem. Cladia borne of corresponding stem apophyses, junction marked by transverse node. Cladia given off in same plane as the stem, conferring the whole colony a planar appearance; divided into regular internodes by oblique nodes, each carrying a distally placed hydrotheca. Cladia almost straight, unless the presence of a lower order branch introduces a bend, like in the stem; up to 4 th order branches, lower order ones given off irregularly. Hydrothecae alternate on both stem and branches, and rather distant; tubular, adnate for half their adaxial length; abaxial wall slightly swollen basally, becoming convex distally; free adaxial wall almost straight ( Fig. 8 F); aperture with three triangular cusps separated by rather deep embayments; a conspicuous abaxial, submarginal cusp projects to a varied degree into the lumen of hydrotheca ( Fig. 8 G). A single gonotheca, of undetermined sex, arises from below the base of a stem hydrotheca; immature, with distal part incomplete; wall with nine free, independent ribs ( Fig. 8 H). Remarks . This species somehow resembles S. filiformis ( Allman, 1888 ) in the colony structure and the shape of hydrotheca. Its gonotheca, though incomplete, recalls also that of Allman’s species. However, the presence of a prominent abaxial, submarginal cusp is not a feature met with in any of the numerous specimens of S. filiformis examined so far. Its identification to species is pending the discovery of specimens with fully formed gonothecae. Distribution in Chile . Magel Island (present study).