Sertularella mixta Galea & Schories, 2012a

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 : 292

Sertularella mixta Galea & Schories, 2012a

Fig. 14H, I; Table 18

Sertularella mixta Galea & Schories, 2012a: 42 , fig. 5A-G.

Sertularella sanmatiasensis . – Galea et al., 2009: 12, fig. 3C-E [non Sertularella sanmatiasensis El Beshbeeshy, 2011 ].

Sertularella ellisii f. lagenoides . – Leloup, 1974: 28, fig. 22 [non Sertularella ellisii ( Milne-Edwards, 1836) ; non S. lagenoides Stechow, 1919 ].

Sertularella peregrina . – Leloup, 1974: 31, fig. 25 [non Sertu- larella peregrina Bale, 1926 ].

Material examined: MHNG-INVE-79667; Chile, Región de Coquimbo, Punta Choros, Bajo Tiburon, -29.2551° -71.5265°, 17 m, coll. D. Schories, lot DS206; 01.11.2009; colony composed of numerous fertile and sterile stems (holotype). – HRG-0642; Chile, Región de los Ríos, north of Corral, Chaihuin, -39.95730° -73.60245°, 6-12 m, coll. D. Schories; 08.10.2012; four male stems 2.3-3.4 cm high. – HRG- 0646; Chile, Región de los Ríos, north of Corral, Chaihuin, -39.95730° -73.60245°, 6-12 m, coll. D. Schories; 16.11.2011; female colony composed of numerous stems up to 2.5 cm high. – HRG-0332; Chile, Región de los Lagos, southern Chiloé, Punta Inio, -43.39300° -74.11769°, 15.6 m, coll. HSFS, HF6, lot A128; 22.02.2008; two female stems, 1.5 and 2.2 cm high.

Description: Colonies arising from creeping, branching, anastomosing hydrorhiza. Stems short, up to 2.8 cm high, monosiphonic, unbranched or sparinglybranched in one plane; basal part of varied length, though generally short, with a few twists above origin from stolon; remainder of stem composed of numerous short, almost collinear, hydrothecate internodes; the latter delimited by oblique nodes sloping in alternate directions. Side branches, when present, borne on short stem apophyses arising from below the bases of stem hydrothecae; occasionally, branches given off from within the hydrothecae; the latter tubular, slightly swollen basally, especially on adaxial side; adnate for about half their length to the corresponding internode; abaxial wall straight to slightly concave basally; aperture mounted on short neck region, expanding at rim; abcauline cusp slightly longer than the three others, though all relatively short, and separated by shallow, rounded embayments; three internal, submarginal perisarc projections (2 latero-adaxial, 1 abaxial). Gonothecae arising from below the hydrothecal bases; ovoid, with several transverse ridges in upper half, much attenuated to absent in lower half; aperture mounted on short, quadrangular neck region, carrying four blunt projections of perisarc.

Dimensions: See Table 18 .

Remarks: The gonothecae of this species are illustrated by both Galea et al. (2009, fig. 3E, as S. sanmatiasensis ) and Galea & Schories (2012a, fig. 5F).

Distribution: Chile – Región de Coquimbo [Península de Coquimbo ( Leloup, 1974, as S. ellisii f. lagenoides ); vicinity of Punta de Choros ( Galea & Schories, 2012a)]; Región de Bío-Bío [Bahía de Lota, Golfo de Arauco ( Leloup, 1974, as S. ellisii f. lagenoides )]; Región de los Ríos [vicinity of Corral (present study)]; Región de los Lagos [south of Isla Grande de Chiloé ( Galea et al., 2009, as S. sanmatiasensis )]; Región de Aysén [Guaitecas Archipelago ( Leloup, 1974, as S. peregrina )].