Sertularella vervoorti El Beshbeeshy 2011
- 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 vervoorti
description
Description: Erect, though flaccid, up to 3.5 cm high colonies arising from creeping stolon. No definite main stem, the original stem branching several times subdichotomously; whole colony monosiphonic in habit. Both stems and branches divided into long, curved, slender internodes through distinct, oblique nodes; a hydrotheca, or a hydrotheca and one or two lateral, indistinct apophysis (es) immediately below its base; lower order branches arising not laterally, but almost perpendicular (in front or rear side) from their higher order counterparts. Hydrothecae strongly shifted to one side of the colony; very large, tubular, adnate to the corresponding internode for only a short part of their adaxial length, then curving outwards; abaxial wall almost straight for most of its length, slightly expanded below aperture; free adaxial wall gently curving basally, then straight; perisarc thin and smooth throughout; margin with 4 small, pointed cusps separated by shallow, semicircular embayments; renovations occasional; a 4 - flapped operculum; hydranths with 18 - 20 filiform tentacles. Gonothecae arising from below the hydrothecal bases; elongated-ovoid, tapering basally, walls transversely-wrinkled; aperture distal, large, 4 - cusped, and provided with a 4 - flapped operculum. Dimensions: See Table 27.
description
Fig. 18 E; Table 27
discussion
Remarks: The gonothecae of this species were described by Watson & Vervoort (2001), and subsequently found by Soto Àngel & Peña Cantero (2015).
distribution
Distribution: Argentina – Provincia de Buenos Aires [scattered records from offshore waters (El Beshbeeshy, 2011)]; Provincia de Tierra del Fuego, Antártida e Islas del Atlántico Sur [off the NE coast of Isla de los Estados (Vervoort, 1972, as S. cylindritheca)]. Falkland Is. – off the NE coast (El Beshbeeshy, 2011). Scotia Arc – Burdwood Bank, South Georgia (Soto Àngel & Peña Cantero, 2015). Tasmanian seamounts (Watson & Vervoort, 2001).
materials_examined
Material examined: ZMH C 11552; FRV Walther Herwig, Stn. 327, Argentine Shelf, off Provincia de Santa Cruz, - 51.18333 ° - 56.95000 °, 225 m; 29.06.1966; sterile, fragmentary colony (fragments 0.5 - 1.5 cm long) [material studied by El Beshbeeshy (2011)].