Published September 30, 2017 | Version v1
Taxonomic treatment Open

Sertularella valdiviae Stechow 1923

Description

Sertularella valdiviae Stechow, 1923b

Figs 12G, H, 17 I-L, 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. 12G) 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].

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).

Notes

Published as part of 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, pp. 255-321 in Revue suisse de Zoologie 124 (2) on page 306, DOI: 10.5281/zenodo.893519

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Linked records

Additional details

Biodiversity

References

  • Stechow E. 1923 b. Neue Hydroiden der Deutschen Tiefsee- Expedition, nebst Bemerkungen uber einige andre Formen. Zoologischer Anzeiger 56 (1 - 2): 1 - 20.
  • Stechow E. 1925. Hydroiden der Deutschen Tiefsee-Expedition. Wissenschaftliche Ergebnisse der Deutschen Tiefsee- Expedition auf dem Dampfer " Valdivia " 1898 - 1899 27: 383 - 546.
  • Ruthensteiner B., Gotz-Bodo R. & Straube N. 2008. The type material of Hydrozoa described by Eberhard Stechow in the Zoologische Staatssammlung Munchen. Spixiana 31 (1): 3 - 27.
  • El Beshbeeshy M. 2011. Thecate hydroids from the Patagonian shelf (Coelenterata, Hydrozoa, Thecata). Edited by G. Jarms. Verhandlungen des Naturwissenschaftlichen Vereins in Hamburg 46: 19 - 233.
  • Soto Angel J. J., Pena Cantero A. L. 2015. On the benthic hydroids from the Scotia Arc (Southern Ocean): new insights into their biodiversity, ecology and biogeography. Polar Biology 38 (7): 983 - 1007.
  • Galea H. R. 2007. Hydroids and hydromedusae (Cnidaria: Hydrozoa) from the fjords region of southern Chile. Zootaxa 1597: 1 - 116.
  • Galea H. R., Haussermann V., Forsterra G. 2007 c. Cnidaria, Hydrozoa: latitudinal distribution of hydroids along the fjords region of southern Chile, with notes on the world distribution of some species. Check List 3 (4): 308 - 320.
  • Alder J. 1856. A notice of some new genera and species of British hydroid zoophytes. Annals and Magazine of Natural History (2) 18 (107): 353 - 362
  • Blanco O. M. 1968. Nueva contribucion al conocimiento de la fauna marina hidroide. Revista del Museo de La Plata 10 (87): 195 - 224.
  • Lamouroux J. V. F. 1821. Exposition methodique des genres de l'ordre des polypiers, avec leur description et celle des principales especes, figurees dans 84 planches, les 63 premieres appartenant a l'histoire naturelle des zoophytes d'Ellis et Solander. Agasse, Paris, 115 pp.
  • Stechow E. 1923 a. Zur Kenntnis des Hydroidenfauna des Mittelmeeres, Amerikas und anderer Gebiete. II. Teil. Zoologische Jahrbucher 47 (1): 29 - 270.
  • Blanco O. M. 1994. Enumeracion sistematica y distribucion geografica preliminar de los Hydroida de la Republica Argentina. Suborden Athecata (Gymnoblastea, Anthomedusae), Thecata (Calyptoblastea, Leptomedusae) y Limnomedusae. Revista del Museo La Plata (Zoologia) 14 (161): 181 - 216.