Stegopoma plicatile

• Main Author: Calder, Dale R.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2012
• Subjects: Biodiversity; Taxonomy; Animalia; Cnidaria; Hydrozoa; Leptothecata; Tiarannidae; Stegopoma; Stegopoma plicatile; Norway; Tromsø; Forbes; Medusa; Rowe; Rotunda; Manger; Vadsø
• Online Access: https://zenodo.org/record/5248518; https://doi.org/10.5281/zenodo.5248518

Stegopoma plicatile (M. Sars, 1863) Fig. 20 Lafoea plicatilis M. Sars, 1863: 31. Stegopoma plicatile.— Kramp, 1935b: 131.— Rees & Rowe, 1969: 14.— Jägerskiöld, 1971: 64.— Cornelius, 1995a: 115, fig. 25B, 117, figs. 25C–F. Type locality. Norway: “…ved Manger, Bejan, Tromsø og Vadsø…” (M. Sars 1863: 32). Museum material. Kosterhavet, 58°53.093’N, 11°05.668’E, 20–30 m, 09.ix.2010, biological dredge, R / V Nereus, one colony, up to 2.3 cm high, on stem of tubularioid hydroid, without gonophores, ROMIZ B3913. Remarks. Schuchert (2000) demonstrated that a free medusa occurs in the life cycle of Stegopoma plicatile (M. Sars, 1863), as in the related Modeeria rotunda (Quoy & Gaimard, 1827), and assigned the species to family Tiarannidae Russell, 1940. Stepanjants (1989) assigned this species to the genus Modeeria Forbes, 1848, as M. plicatile, while Schuchert suggested it might be the hydroid of Chromatonema rotunda (intending it for C. rubrum Fewkes, 1882). Other contemporary taxonomic accounts of this hydroid include those of Vervoort (1972), Edwards (1973a), Cornelius (1995a), and Schuchert (2001a). Molecular studies by Peña Cantero et al. (2010) indicate a close relationship between S. plicatile (family Tiarannidae) and Anthohebella parasitica (Ciamician, 1880) (family Hebellidae Fraser, 1912). The link between Tiarannidae (superfamily Laodiceoidea L. Agassiz, 1862), generally considered an “operculate” taxon, and Hebellidae (usually assigned to superfamily Lafoeoidea A. Agassiz, 1865), traditionally classified amongst “non-operculate” families, had been noted earlier from the morphology of their medusa stages (Migotto & Andrade 2000; Bouillon et al. 2006). Indeed, a relationship between laodiceoids and supposed lafoeoids had been proposed in the nineteenth century by A. Agassiz (1865), who linked a laodiceid medusa to a hydroid he supposed to be a lafoeid, but the discovery had long been discounted (see Calder, 1991: 31, 32). In southwestern Scandinavia, Christiansen (1972) reported finding Stegopoma ...