Philobrya capillata Dell 1964

• Main Authors: Urcola, Matias Ricardo, Zelaya, Diego Gabriel
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2024
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Bivalvia; Arcida; Philobryidae; Philobrya; Philobrya capillata; Antarc*; Antarctic; Antarctic Peninsula
• Online Access: https://doi.org/10.5281/zenodo.10984635; http://treatment.plazi.org/id/A279878B7408D211F5EAE711FDAEFE7A

Philobrya capillata Dell, 1964 (Figure 9) Philobrya capillata Dell, 1964: 170 (in part), text figs. 2.5, 2.9, pl. 4, figs. 4, 5 [not text. fig. 2.8, pl. 4, fig. 9 = P. delli ]. Philobrya magellanica. Jackson et al . 2015: figs. 2G, 3G. (Not Stempell, 1899: 230, pl. 12, figs. 13‒15). Type locality: Shag Rocks, 53°43.67’S 40°57.00’W, 177 m. Material examined: Photographs of the holotype (NHMUK 1962867). Shag Rocks: 53°23.80’S 42°42.03’W, 313 m (MLP-Ma 16117: 1 v). South Georgia: 54°30’S 35°50’W, 94 m (MACN-In 44439: 2 spec). Distribution: Antarctic Peninsula (Dell 1964), Shag Rocks (Dell 1964; Jackson et al . 2015; this study) and South Georgia (this study); 93‒ 313 m. Description: Shell large (maximum L = 10 mm), mytiliform, relatively high ( H/L = 0.81 ± 0.01, n = 3), somewhat inflated ( W/H = 0.67 ± 0.04, n = 3), solid; with a narrow, flat dorsal slope. Umbos broad, rounded, located at anterior end. Umbonal angle: 90‒100° (n = 3). Dorsal margin with the anterior portion relatively long, straight, slightly oblique backwards, and the posterior portion widely arched, forming a continuous curve with the posterior margin. Ventral margin slightly sinuated by byssal notch. Prodissoconch D-shaped, with posterior end higher than anterior end, widely projected ventrally, of 470‒575 µm Lp (n = 3), separated from the dissoconch by a prominent rim. Surface microscopically pitted. Antero-dorsal and postero-dorsal areas ill-differentiate. Dissoconch whitish, dull. Sculpture finely cancellate, consisting of 32‒40 faint radial ribs and numerous, densely packed commarginal cords. Radial and commarginal sculpture similar in strength. Periostracum thick, yellowish straw, extending up to 0.5 mm from calcified shell margin; forming narrow radial folds, raised commarginal lamellae, and very short, thin setae. Commarginal lamellae extending up to the tip of the setae, but forming a deep sinuation between contiguous setae. Inner shell surface with 36‒40 folds radiating from the umbo to shell margins, producing crenulations, those ...