Filellum bouvetensis Marques, Peña, Miranda & Migotto, 2011, sp. nov.
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) (PS 65 /028), with coppiniae. Ty...
| Main Authors: | , , , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
2011
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| Subjects: | |
| Online Access: | https://zenodo.org/record/6190988 https://doi.org/10.5281/zenodo.6190988 |
| Summary: | 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) (PS 65 /028), with coppiniae. Type locality. From the holotype, 54 o 22.49 ’– 54 o 22.54 ’S; 0 3 o 17.58 ’– 03o 17.21 ’E, 122–134m (Peña Cantero & Gili 2006: 765, 766). Material examined. ANTARCTIC OCEAN: Bouvet Island, PS 65 / 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 X 3 –3.5 µm. Distribution. Known only from Bouvet Island (Peña Cantero & Gili 2006). Remarks. The material from Bouvet Island, here described as ... |
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