Silicularia rosea Meyen, 1834

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 : 11-12

Silicularia rosea Meyen, 1834

( fig. 5 D)

Silicularia rosea Meyen, 1834: 204 , pl. 35 figs 1 –11. – Vervoort & Watson, 2003: 442, fig. 108A–D.

Material examined. Stn. T14, 23.ii.2005: dense colonies, up to 5 mm high, bearing both male and female gonothecae, on Macrocystis pyrifera . Stn. T21, 31.x.2007: two fertile colonies (male and female), ca. 5 mm high, on Macrocystis pyrifera ( NHM 2009.26).

Distribution. Previously recorded creeping on fronds of Macrocystis pyrifera from both Gough [Ritchie 1907, as S. hemisphaerica (Allman, 1888) ] and Nightingale islands (Vanhöffen 1910, as S. rosea ). This species has a circumglobal distribution in Antarctic and sub-Antarctic waters (Vervoort & Watson 2003).

Figures

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

FIGURE 5. A to C: Plumularia setacea (Linnaeus, 1758) – stem internode and basal part of cladium (A); female gonotheca (B); stolonal nematothecae (C). D: Silicularia rosea Meyen, 1834 – hydrotheca (middle), female (left) and male (right) gonothecae. E: Clytia gracilis (M. Sars, 1850) – hydrotheca atop its pedicel. F: Clytia paulensis (Vanhöffen, 1910) – hydrotheca atop its pedicel. G: Obelia dichotoma (Linnaeus, 1758) – fragment of stem with hydrotheca. H: Obelia geniculata (Linnaeus, 1758) – stem internode with hydrotheca. Scale bars: 100 µm (C); 200 µm (G); 300 µm (A, B, F, H); 400 µm (E); 1 mm (D).