Rhamphostomella alutacea Gontar 1993

• Main Authors: Grischenko, Andrei V., Gordon, Dennis P., Taylor, Paul D., Kuklinski, Piotr, Denisenko, Nina V., Spencer-Jones, Mary E., Ostrovsky, Andrew N.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2022
• Subjects: Biodiversity; Taxonomy; Animalia; Bryozoa; Gymnolaemata; Cheilostomatida; Umbonulidae; Rhamphostomella; Rhamphostomella alutacea; Okhotsk; Pacific; Rodino; Kamchatka; Sakhalin
• Online Access: https://zenodo.org/record/6520689; https://doi.org/10.5281/zenodo.6520689

Rhamphostomella alutacea Gontar, 1993 (Figs 10, 32C–E) Rhamphostomella alutacea Gontar, 1993a, p. 12, fig. 7. Rhamphostomella alutacea: Denisenko 2013, p. 184. Material examined. Holotype: ZIRAS 1 /44569, colony encrusting skeleton of sea urchin, Kuril-Sakhalin Expedition of Zoological Institute (ZIRAS) and Pacific Institute of Fisheries and Oceanography (TINRO), 15 September 1949, Krabovaya Bight, Shikotan Island, Lesser Kuril Ridge, Pacific Ocean, depth 55 m, shell, rock dredge, collector E.F. Guryanova. Paratype: ZIRAS 2 /50123, five fragments of single colony detached from broken shell of the bivalve Chlamys sp., MFRT Rodino, 12 September 1992, about 32 km from Cape Hayryuzova, western Kamchatka shelf, Sea of Okhotsk, 57°36.2ʹ N, 156°09.0ʹ E, depth 78–81 m, crab trap, collector A. V. Grischenko. Measurements. ZIRAS 2/50123, western Kamchatka, Sea of Okhotsk (Fig. 10A–L). ZL, 0.60–0.93 (0.71 ± 0.09). ZW, 0.35–0.55 (0.44 ± 0.05). ZD, 0.59–0.65 (n = 2). OrL, 0.15–0.25 (0.19 ± 0.03). OrW, 0.20–0.27 (0.22 ± 0.02). OeL, 0.17–0.27 (0.24 ± 0.03). OeW, 0.24–0.35 (0.30 ± 0.03). Av(s)L, 0.07–0.14 (0.10 ± 0.01). P(m)N, 16–26 (19). P(oe)N, 1–10 (6). Description. Colonies encrusting, multiserial, unilaminar (Fig. 10A), irregular in form, attaining 33 mm in maximal dimension; bright red to orange when alive, dark red to pink when dry. Zooids of medium size, hexagonal, oval to pyriform or irregular, arranged in quincunx, demarcated by fine, meandering sutures between lateral and transverse walls (Fig. 10A, D–H); boundaries less distinct in older parts of colony. Frontal shield umbonuloid (Fig. 10A, D, I), thickened, pustulose, convex in young zooids, flattened and smoother in older ones owing to its thickening. Large, deep, round to oval areolae along margins (Fig. 10D–H), separated by short narrow interareolar ridges that may reach suboral avicularian cystid in distal part of frontal shield, mainly in young zooids. Thickening of frontal shield in older parts of colony resulting in considerable change in appearance, with ...