Sertularella asymmetra Galea & Schories, 2014

Horia R. Galea, Dirk Schories, Verena Häussermann & Günter Försterra, 2017, Taxonomic revision of the genus Sertularella (Cnidaria: Hydrozoa) from southern South America and the subantarctic, with descriptions of five new species, Revue suisse de Zoologie 124 (2), pp. 255-321 : 263

Sertularella asymmetra Galea & Schories, 2014

Fig. 3H, I

Sertularella asymmetra Galea & Schories, 2014 in Galea et al.,

2014: 31, figs 6A-B, 7A.

Material examined: MHNG-INVE-86230; Chile, Región de los Ríos, Corral, Chaihuin/Huiro, -39.95000° -73.61667°, 10 m, coll. D. Schories, lot #05; 27.10.2011; a 4 cm high colony with female gonothecae (holotype). – MHNG-INVE-86231; Chile, Región de los Ríos, Corral, Chaihuin/Huiro, -39.95000° -73.61667°, 10 m, coll. D. Schories, lot #26; 03.10.2011; a 2.5 cm high colony with male gonothecae.

Description: Colonies arising from creeping, branching, anastomosing hydrorhiza. Stems erect, up to 4 cm high, monosiphonic, spirally-twisted above origin from stolon, then divided into short, slightly geniculate internodes by deep, oblique constrictions of the perisarc. Side branches arise irregularly from below the bases of stem hydrothecae, either laterally, or slightly displaced towards the front or the rear side of the colony; structure similar to that of stem. Hydrothecae biseriate, alternate, fusiform, adnate for about 1/3rd their adaxial side to the corresponding internode; free adaxial wall swollen proximally, and provided with 2-3 weak, transverse ridges; abaxial wall with smooth perisarc, slightly concave proximally, becoming convex below the aperture; the latter facing upwards, and composed of four triangular cusps separated by shallow embayments, abaxial cusp produced; a 4-flapped operculum; three internal, submarginal cusps: 2 latero-adaxial and 1 abaxial. Gonothecae arising from below the hydrothecal bases; elongated-ovoid, walls more or less transversely ridged; male similar to female, though slenderer and longer; aperture surrounded by 3-4 perisarc projections in male and 5 in female; the latter producing 12-18 oocytes.

Dimensions: Internodes 560-730 μm long and 140- 230 μm wide at nodes. Hydrothecal free adaxial length 285-355 μm, adnate adaxial length 230-280 μm, abaxial length 535-590 μm, maximum width 250-285 μm, diameter at aperture 230-240 μm. Length of the female gonotheca ca. 1695 μm, and of the male ca. 1890 μm; maximum width of the female gonotheca ca. 795 μm, and of the male ca. 710 μm.

Remarks: The gonothecae of this species are illustrated by Galea et al. (2014, fig. 7A).

Distribution: Chile – Región de los Ríos [Corral ( Galea et al., 2014)].