Sertularella gayi (Lamouroux, 1821)

Galea, Horia R., 2010, Notes on a small collection of thecate hydroids (Cnidaria: Hydrozoa) from Tristan da Cunha, south Atlantic, Zootaxa 2336, pp. 1-18 : 10

Sertularella gayi (Lamouroux, 1821)

( fig. 4 N, O)

Sertularia Gayi Lamouroux, 1821: 12 , pl. 66 figs 8–9.

Sertularella gayi – Ramil et al., 1992: 496, figs 1 A, 2–3. – Cornelius, 1995b: 71, fig. 16.

Material examined. Stn. T10, 15.ii.2005: one sterile colony, 5.5 cm high, with polysiphonic stem. Stn. T19, 07.iii. 2005: one fragmentary colony, 6.5 cm high, polysiphonic basally, and a large, polysiphonic colony, 11 cm high ( NHM 2009.21), both sterile.

Distribution. Sterile specimens of this species, from off Gough Island (depth 183 m), were previously collected by the S.Y. Scotia (Ritchie 1907) . This species is widely distributed in the Atlantic, though absent from Antarctic waters; also present in the northern Pacific (Vervoort & Watson 2003).

Figures

FIGURE 1. Map of the Tristan da Cunha archipelago, with the location of stations yielding hydroid material.

FIGURE 4. A to E: Halecium? delicatulum (Coughtrey, 1876), morphotype 2 (continued) – gonotheca replacing a hydrotheca (A) or arising from stolon (B); mature female gonotheca with eggs (C); various shapes of female gonotheca (D); cross section through gonotheca (E). F and G: Amphisbetia minima (Thompson, 1879) – basal portion of stem (F); gonotheca (G). H to M: Sertularella sp. – basal part of stem (H); fragment of stem showing its straight shape (I) and mode of branching (J); two internodes (K); shape of hydrotheca (L); frontal views of two hydrothecal apertures showing 3 and 5 internal projections of perisarc (M). N and O: Sertularella gayi (Lamouroux, 1821) – fragment of monosiphonic part of stem with basal parts of three side branches (N); various shapes of the hydrotheca (O); P and R: Aglaophenia parvula Bale, 1882 – hydrotheca and detail of its margin (P); female corbula (R). S: Antennella quadriaurita Ritchie, 1909 – detail of stem in lateral (left) and frontal (right) views. Scale bars: 100 µm (M, P); 200 µm (F, S); 300 µm (A, B, E, K, L, O); 400 µm (J); 500 µm (C, D, G); 750 µm (H); 1 mm (I, R); 1.5 mm (N).