Sertularella valdiviae Stechow, 1923b,

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: 306

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Sertularella valdiviae Stechow, 1923b


Sertularella valdiviae Stechow, 1923b 

Figs 12G, HView Fig. 12, 17 I-L, 18View Fig. 18 A-D; Table 26

Sertularella valdiviae Stechow, 1923b: 11  . – Stechow, 1925: 471, fig. 31. – Ruthensteiner et al., 2008: 23.

Sertularella jorgensis El Beshbeeshy, 2011: 136  , fig. 43 (syn. nov.). – Soto Àngel & Peña Cantero, 2015: 994, fig. 7E-F.

non Sertularella jorgensis  . – Galea, 2007: 63, fig. 14G, H. – Galea et al., 2007c: 312, fig. 4B [= Sertularella tenella ( Alder, 1856)  ].

Sertularella gayi parva  . – Blanco, 1968: 217, pl. 4 figs 8-11; 1994: 199 [non Sertularella gayi ( Lamouroux, 1821) var. parva Billard, 1925  ].

Material examined: ZSM 20050521; French Southern and Antarctic Lands, 7 km west off St. Paul, -38.66667° -77.64333°, 672 m, coll. Deutsche Tiefsee ( Valdivia  ) Expedition 1898-1899, Stn. 165; 03.01.1899; microslide ( Fig. 12GView Fig. 12) comprising five colony fragments of Sertularella valdiviae Stechow, 1923  , 3-23 mm high, one of which is fertile and bears 8 empty gonothecae. – ZSM 20050522; French Southern and Antarctic Lands, 7 km west off St. Paul, -38.66667° -77.64333°, 672 m; 03.01.1899; coll. Deutsche Tiefsee ( Valdivia  ) Expedition 1898-1899, Stn. 165, microslide ( Fig.

12H) comprising three colony fragments (one of which bearing a gonotheca) of S. valdiviae  , 6-14 mm high. – ZMH C11886; FRV Walther Herwig, Stn. 257, Argentine Shelf, -53.93333° -63.85000°, depth not recorded; 06.02.1971; several sterile, erect stems of Sertularella jorgensis El Beshbeeshy, 2011  , up to 5 mm high, showing terminal stolonization, as well as a number of stolonal hydrothecae on the same hydrorhiza, both with remains of coenosarc only. – ANT XIX/5 ID.91; RV Polarstern, cruise ANT XIX/5, Stn. 253, Elephant I., -61.40050° -55.41200°, 276-282 m; 25.04.2012; sterile colony composed of several stems up to 3.5 cm high [material studied by Soto Àngel & Peña Cantero (2015), as S. jorgensis  ].

View Fig. 12

Description: Monosiphonic, slender, irregularly and sparingly-branched stems, up to 4 cm high, arising from creeping, filiform hydrorhiza; prisarc smooth or with 2-3 basal twists above origin from stolon. Stems and branches divided into long, geniculate internodes; nodes oblique, not always clearly demarcated; a hydrotheca confined to the distal end of each internode. Branches arising from below a stem hydrotheca, not always strictly laterally, but shifted on to the anterior or posterior sides of the stem, giving the colony a three-dimensional appearance; up to 4th order branching observed; branches with similar structure as that of stem; 1 st internode  comparatively longer than subsequent ones, and provided with 1-2 basal twists. Hydrothecae biseriate, alternate, distant from one another, occasionally not strictly coplanar; rather long, tronconical to almost tubular, adnate for a varied length, from 1/2 to 2/5th fused with the corresponding internode; abaxial wall slightly concave to straight, free adaxial wall with 2-4 wrinkles extending towards abaxial wall; 4 small, triangular marginal cusps separated by shallow embayments; a 4-flapped operculum; rim occasionally renovated; hydranths with 14-18 tentacles. Gonothecae given off from below the bases of cladial hydrothecae, elongated-ovoid, significantly tapering below, distally rounded, devoid of a neck region and perisarcal projections, walls with 4-6 transverse wrinkles.

Dimensions: See Table 26.

Remarks: By comparing parts of El Beshbeeshy’s (2011) and Soto Àngel & Peña Cantero’s (2015) materials assigned to S. jorgensis  to the type of S. valdiviae Stechow, 1923b  , it appears that there are no morphological differences between them (compare Fig. 17I, J and K, respectively). Both nominal species prove coterminous, with S. valdiviae  having priority over El Beshbeeshy’s species. The gonothecae, not already known in S. jorgensis  , are only present in the St. Paul material.

Distribution: Argentina – Provincia de Tierra del Fuego, Antártida e Islas del Atlántico Sur [off the southeastern coast of Isla de los Estados ( Blanco, 1968; 1994, both as S. gayi parva  )]; scattered records from the Argentine Shelf, ranging between 42°-46° S ( El Beshbeeshy, 2011, as S. jorgensis  ). Between Península Mitre and the Falkland Is. ( El Beshbeeshy, 2011, as S. jorgensis  ). Scotia Arc  – South Sandwich Is., Elephant I. ( Soto Àngel & Peña Cantero, 2015, as S. jorgensis  ). French Southern and Antarctic Lands – St. Paul ( Stechow, 1923b, 1925).














Sertularella valdiviae Stechow, 1923b

Horia R. Galea, Dirk Schories, Verena Häussermann & Günter Försterra 2017

Sertularella jorgensis

El Beshbeeshy 2011: 136

Sertularella jorgensis

El Beshbeeshy 2011

Sertularella gayi parva

Billard 1925

Sertularella gayi ( Lamouroux, 1821 ) var. parva

Billard 1925

Sertularella valdiviae

Stechow 1923: 11

Sertularella tenella (

Alder 1856