Filellum bouvetensis Marques, Peña, Miranda & Migotto, 2011, sp. nov.

• Main Authors: Marques, Antonio C., Peña, Álvaro L., Miranda, Thaís P., Migotto, Alvaro E.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2011
• Subjects: Biodiversity; Taxonomy; Animalia; Cnidaria; Hydrozoa; Leptothecata; Lafoeidae; Filellum; Filellum bouvetensis; Antarc*; Antarctic; Antarctic Ocean; Bouvet Island
• Online Access: https://doi.org/10.5281/zenodo.6190988; http://treatment.plazi.org/id/0389B761B71BAD32FF2EC5E11A7534C9

Filellum bouvetensis sp. nov. (Figure 2 A–D) Filellum contortum : Peña Cantero and Gili 2006: 766. Non Lafoea contorta Nutting, 1905: 945, pl. 3, fig. 6, pl. 9, figs. 8–9 [= Filellum contortum (Nutting, 1905)]. Type series. Holotype— Filellum contortum (Nutting, 1905) (PS65/028), with coppiniae. Type locality. From the holotype, 54o22.49’– 54o22.54’S; 0 3o17.58’– 03o17.21’E, 122–134m (Peña Cantero & Gili 2006: 765, 766). Material examined. ANTARCTIC OCEAN: Bouvet Island, PS65/28 (25 November 2003, 122– 134m), colonies epibiotic on various hydroids ( Antarctoscyphus elongatus , Schizotricha multifurcata , Sertularella sanmatiasensis , Symplectoscyphus sp.); with coppinia. Description. Colonies stolonal, with filiform creeping hydrorhiza. Hydrotheca sessile, arising uprightly and almost completely free from hydrorhiza. When present, abcauline side of adnate part provided with a few striae. Hydrothecal aperture circular and slightly everted, usually with very long rim renovations. Free adcauline hydrothecal part 0.65– 0.187 mm long. Hydrothecal aperture 0.18–0.25 mm wide. Coppiniae up to 4 mm wide and 2 mm high, some almost completely surrounding the stem of the host hydroid, forming a ring of ca. 4 mm wide. Coppinia composed of firmly adpressed gonothecae with long defensive tubes at periphery, arching over the centre of the gonothecal mass and forming a corbula-like structure. Defensive tubes unforked and with distal aperture. Gonothecae elongated, roughly polygonal in apical view, but with a rather inconstant arrangement in lateral view; distal most part of gonothecae usually free and with irregular shape. Gonothecal aperture circular, situated on a very short, frequently unconspicuous, non-everted distal neck, 0.55–0.6 mm high, 0.1–0.2 mm wide and aperture 0.55– 0.6 mm wide. Cnidome composed of microbasic mastigophores (not seen discharged), 6.5–8.5 X3 –3.5 µm. Distribution. Known only from Bouvet Island (Peña Cantero & Gili 2006). Remarks. The material from Bouvet Island, here described as Filellum ...