Brookula pfefferi Powell 1951

• Main Authors: Schwabe, Enrico, Engl, Winfried
• Format: Other/Unknown Material
• Language: unknown
• Published: 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Gastropoda; Seguenziida; Brookula; Brookula pfefferi; Antarctic; The Antarctic; Antarctic Peninsula; Weddell Sea; Weddell; Stromness; Pelseneer; Stromness Harbour; Antarc*; Arctic
• Online Access: https://zenodo.org/record/5631755; https://doi.org/10.5281/zenodo.5631755

Brookula pfefferi Powell, 1951 (Fig. 9) ? Cyclostrema decussatum Pelseneer, 1903: 19, pl. 5, fig. 48. Brookula pfefferi Powell, 1951: 104, pl. 5, fig. 8. Brookula rossiana Dell, 1990: 102, fig. 169. Brookula sinusbreidensis Numanami & Okutani, 1991: 38, figs 2–6. Brookula delli Numanami, 1996: 55, figs 30 A–E. Holotype of B. pfefferi (NHM 1961.368). Type locality: Atlantic Ocean, South Georgia, off mouth of Stromness Harbour (54 °04’S 36 ° 27 ’W – 53 ° 58 ’S 36 ° 26 ’W), 155– 178 m. OD. Material examined: 40 specimens (ZSM Mol 20021687), Weddell Sea sector of the Antarctic Peninsula (63 °01.10’S 61 °09.10’W), 311–365 m, ANT XVII/ 3 (EASIZ 3). Remarks: This is the only species for which numerous specimens were available. The shell morphology of B. pfefferi is sufficiently described in Absalão et al. (2001) and Zelaya et al. (2006) but at least a first preliminary (excluding the ctenidia) overview of the external bauplan of the species may be given here (Fig. 9). Radula data were provided by Zelaya et al. (2006). A detailed histological examination is being undertaken by Thomas Kunze (Ludwig­Maximilians University, Munich, Germany). The cylindrical head has a cloven, obtusely pointed snout. There is a pair of long, thick cephalic tentacles that show in their anterior half laterally dense fringes of sensory papillae. It is likely that the short rudiment on the base of the cephalic tentacle (Fig. 9 C) belongs to the eye stalk (eyes are not visble in the examined specimen), but this has to be confirmed by the histological data. The foot is fleshy and elongate, anteriorly with two wide, conical foot lappets and posteriorly, under the horny, circular, multispiral operculum (Fig. 9 D) with two shorter ones. Laterally between the anterior and posterior foot lappets a fringe of about 12 short, smooth, elongate epipodial tentacles is situated; at least on the dried animal, the tentacles do not show epipodial sense organs. There is a dense fringe of slender, hair­like cilia on the lateral foot margins. Immediately ...