Rhamphostomella aleutica Grischenko & Gordon & Taylor & Kuklinski & Denisenko & Spencer-Jones & Ostrovsky 2022, n. sp.

• 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 aleutica; Amchitka; Amchitka Island; Bering Sea; Rat Islands; Alaska; Aleutian Islands
• Online Access: https://zenodo.org/record/6520687; https://doi.org/10.5281/zenodo.6520687

Rhamphostomella aleutica n. sp. (Fig. 9) Diagnosis. Colony encrusting, multiserial. Zooids large, hexagonal. Frontal shield ventricose, finely tuberculated. Marginal areolae deep, separated by short interareolar ridges. Umbonuloid component extensive. Primary orifice submerged, irregularly circular, often with small median process. Condyles absent. No oral spines. Secondary orifice subcircular to irregularly oval, cormidial, defined by tubular peristome. Peristomial rim with acute or blunt-tipped spine-like tubular projections, 2–4 on each side, slightly tilted inwards. Suboral avicularian cystid asymmetrically situated proximolaterally to orifice, with coarsely granular surface. Rostrum elongate triangular with narrowing hooked tip. Crossbar complete. No adventitious avicularia. Ovicells hyperstomial. Ectooecium smooth, lacking secondary calcification, with small pseudopores. Two pore chambers in distolateral wall and 1‒2 multiporous septula in transverse walls. Basal surface of zooids fully calcified, lacking protuberances. Material examined. Holotype: NHMUK 2010.4.21.1, one colony encrusting a sponge, Alaska Fisheries Science Center and National Marine Fisheries Service Collection, FV Sea Storm, Haul 190, Stn 114–21, 23 July 2004, coastal waters of Amchitka Island, Rat Islands, western Aleutian Islands, Bering Sea, 51°51.6ʹ N, 178°27.8ʹ E, depth 224– 235 m, collector M.H. Dick. Etymology. The species name alludes to the type locality in the Aleutian Islands. Type locality. Coastal waters of Amchitka Island, Rat Islands, western Aleutian Islands, Bering Sea, 51°51.6ʹ N, 178°27.8ʹ E, depth 224–235 m. Measurements. NHMUK 2010.4.21.1, Amchitka Island, Aleutian Islands, Bering Sea (Fig. 9A–L). ZL, 0.81– 1.14 (0.93 ± 0.07). ZW, 0.54–0.87 (0.73 ± 0.08). ZD, 0.44–0.62 (n = 2). OrL, 0.27–0.40 (0.32 ± 0.03). OrW, 0.24– 0.40 (0.33 ± 0.03). OeL, 0.34–0.37 (0.35 ± 0.01) (n = 3). OeW, 0.45–0.52 (0.48 ± 0.03) (n = 3). Av(s)L, 0.24–0.39 (0.32 ± 0.03). P(m)N, 15–20 (17) (n = 10). P(oe)N, 16–18 (17) (n = 4). Description. ...