Sertularella tenella ( Alder, 1856 )

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: 304-306

publication ID

10.5281/zenodo.893519

persistent identifier

http://treatment.plazi.org/id/682DE627-FFEF-FF91-FC78-6E42FD91FB7C

treatment provided by

Plazi

scientific name

Sertularella tenella ( Alder, 1856 )
status

 

Sertularella tenella ( Alder, 1856) 

Sertularia tenella Alder, 1856: 357  , pl. 13 figs 3-6. – Galea & Schories, 2012a: 45, fig. 5H-J.

non Sertularella tenella  . – Jäderholm, 1905: 31, pl. 12 fig. 8. – Ritchie, 1907: 78. – p.p. Rees & Thursfield, 1965: 138. – Blanco, 1963: 173, figs 7-8 [all = Sertularella robusta Coughtrey, 1876  ].

Sertularella jorgensis  . – Galea, 2007: 63, fig. 14G, H. – Galea et al., 2007b: 312, fig. 4B [non Sertularella jorgensis El Beshbeeshy, 2011  = Sertularella valdiviae Stechow, 1923b  ].

(?) Sertularella robusta  . – Soto Àngel & Peña Cantero, 2015: 996, fig. 7G [non Sertularella robusta Coughtrey, 1876  ].

Material examined: MHNG-INVE-53215; Chile, Région de Magallanes y de la Antártica Chilena, Canal Farquhar, -48.48853° -74.20714°, 32 m, coll. HSFS, HF2, lot #45; 29.03.2005; a colony composed of both stolonal hydrothecae and erect stems up to 1.2 cm high, formerly identified as S. jorgensis  (see Galea, 2007). – HRG-0361; Chile, Región de los Lagos, Caleta La Arena, Caleta Yerbas Buenas, -41.67263° -72.65650°, 20 m, coll. D. Schories, lot DS095; 08.03.2009; two sterile stems, 4 and 7 mm high. – HRG-0359; Chile, Región de los Lagos, Caleta La Arena, Caleta Yerbas Buenas, -41.67263° -72.65650°, 20 m, coll. D. Schories, lot S15; 26.04.2011; several sterile stems, 4-11 mm high, on worm tube. – HRG-1244; France, Brittany, N of Pointe Penmarc’h, off Gaouac’h rock, 23 m, coll. F-X. Decaris; 14.05.2016; a sterile colony, 2.5 cm high.

Description: Short (up to 1.2 cm high), erect, monosiphonic, unbranched stems or stolonal hydrothecae arising from creeping hydrorhiza; divided into relatively long, slender, geniculate internodes by means of oblique constrictions of the perisarc slanting in alternate directions; a hydrotheca distally to each internode. Hydrothecae biseriate, alternate, coplanar, tronconic, adnate for 1/3rd to their corresponding internodes; abcauline wall straight to slightly concave, with smooth to slightly wrinkled perisarc; free adcauline wall with 3-4 undulations, not always reaching abcauline side; rim somewhat everted, provided with 4 pointed triangular cusps separated by moderately-deep, semicircular embayments; closing apparatus composed of 4 opercular flaps with concentric striations; no internal, submarginal cusps. Gonothecae absent in all material from the study area.

Dimensions: See Table 25.

Remarks: The typical silhouette of a stem is shown in Galea (2007, fig. 14G). The hydrothecae in this material are less wrinkled than those of European specimens (compare Fig. 17F, G and H).

The material assigned earlier to S. jorgensis El Beshbeeshy, 2011  by Galea (2007) (now recognized as a junior synonym of S. valdiviae Stechow, 1923b  , see below) differs from that nominal species mainly through the morphology of its hydrothecae (compare Fig. 17F, G and Fig. 18View Fig. 18 A-C).

The rather thick internodes and the hydrothecae devoid of submarginal, intrathecal cusps in the material identified as S. robusta Coughtrey, 1876  by Soto Àngel & Peña Cantero (2015) equally point towards the present species.

Distribution: Chile – Región de los Lagos [Seno de Reloncaví ( Galea & Schories, 2012a)]; Región de Magallanes y de la Antártica Chilena [Canal Farquhar ( Galea, 2007; Galea et al., 2007b; both as S. jorgensis  )]. Scotia Arc  – Burdwood Bank, South Sandwich Is. ( Soto Àngel & Peña Cantero, 2015, as S. robusta  ).

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Sertulariidae

Genus

Sertularella

Loc

Sertularella tenella ( Alder, 1856 )

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

2017
Loc

Sertularella jorgensis

El Beshbeeshy 2011

2011
Loc

Sertularella jorgensis

El Beshbeeshy 2011

2011
Loc

Sertularella valdiviae

Stechow 1923

1923
Loc

Sertularella robusta

Coughtrey 1876

1876
Loc

Sertularella robusta

Coughtrey 1876

1876
Loc

Sertularella robusta

Coughtrey 1876

1876
Loc

Sertularia tenella

Alder 1856: 357

1856