Sertularella tenella (Alder 1856)
- Dataset
- Taxonomic revision of the genus Sertularella (Cnidaria: Hydrozoa) from southern South America and the subantarctic, with descriptions of five new species
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Cnidaria
- class
- Hydrozoa
- order
- Leptothecata
- family
- Sertulariidae
- genus
- Sertularella
- species
- Sertularella tenella
description
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 / 3 rd 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.
discussion
Remarks: The typical silhouette of a stem is shown in Galea (2007, fig. 14 G). The hydrothecae in this material are less wrinkled than those of European specimens (compare Fig. 17 F, 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, 1923 b, see below) differs from that nominal species mainly through the morphology of its hydrothecae (compare Fig. 17 F, G and 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
Distribution: Chile – Región de los Lagos [Seno de Reloncaví (Galea & Schories, 2012 a)]; Región de Magallanes y de la Antártica Chilena [Canal Farquhar (Galea, 2007; Galea et al., 2007 b; both as S. jorgensis)]. Scotia Arc – Burdwood Bank, South Sandwich Is. (Soto Àngel & Peña Cantero, 2015, as S. robusta).
materials_examined
Material examined: MHNG-INVE- 53215; Chile, Région de Magallanes y de la Antártica Chilena, Canal Farquhar, - 48.48853 ° - 74.20714 °, 32 m, coll. HSFS, HF 2, 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 DS 095; 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 S 15; 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.
Name
- Homonyms
- Sertularella tenella (Alder 1856)