Rhamphostomella tatarica

• 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 tatarica; Okhotsk; Rodino; Kamchatka; Sakhalin
• Online Access: https://zenodo.org/record/6520699; https://doi.org/10.5281/zenodo.6520699

Rhamphostomella tatarica (Androsova, 1958) (Figs 20, 33C, D) Escharopsis tatarica Androsova, 1958, p. 168, fig. 98. Escharopsis tatarica: Kluge et al. 1959, p. 213; Kluge 1961, p. 141. Posterula tatarica: Denisenko 2013, p. 185. Material examined. Holotype: ZIRAS 1 /3701, single colony, RV Toporok, Stn 12, 6 July 1947, eastern Tatar Strait, coastal waters of southern Sakhalin Island, Sea of Japan, depth 117 m, boulders, beam-trawl, collector Z.I. Kobjakova. Paratype: ZIRAS 2 /3852, single colony, RV Toporok, Stn 29, 21 August 1949, Tatar Strait, Sea of Japan, depth 43 m, silted sand with shells, dredge, collector Z.I. Kobjakova. ZIRAS 7 /50548, two colony fragments, 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 7/50548, western Kamchatka, Sea of Okhotsk (Fig. 20A–M). ZL, 0.82–1.20 (1.01 ± 0.10). ZW, 0.37–0.78 (0.53 ± 0.07). ZD, 0.43–0.54 (n = 2). OrL, 0.21–0.29 (0.25 ± 0.02). OrW, 0.24–0.31 (0.28 ± 0.02). OeL, 0.29–0.36 (0.31 ± 0.02) (n = 10). OeW, 0.39–0.45 (0.42 ± 0.02) (n = 10). Av(s)L, 0.13–0.20 (0.16 ± 0.02). P(m)N, 19–30 (25). P(oe)N, 9–18 (15) (n = 10). Description. Colonies encrusting, multiserial, unilaminar (Fig. 20A), irregular in form; largest among our fragments was about 13 × 7 mm; bright brown when alive, light brown when dry. Zooids large, oblong hexagonal, pyriform, rectangular or irregular in shape (Fig. 20A, D–G), arranged in checkered pattern, demarcated by fine sinuous sutures between lateral and transverse walls recognizable in all colony parts. Frontal shield umbonuloid (Fig. 20A), thin, dimpled with reticulate appearance, flat or moderately convex in young zooids (Fig. 20A, D), becoming more convex in older zooids (Fig. 20E–G). Frontal shield with angular marginal areolae (Fig. 20A, B, D–H), separated by short narrow interareolar ridges in young zooids (Fig. 20A, D), becoming more elongate and distinctly larger with age and, thus ...