Hippothoa watersi Morris 1980

• Main Author: Gordon, Dennis P.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Bryozoa; Gymnolaemata; Cheilostomatida; Hippothoidae; Hippothoa; Hippothoa watersi; Pacific; Norway; New Zealand; Hayward; Antarc*; Antarctica
• Online Access: https://zenodo.org/record/3717942; https://doi.org/10.5281/zenodo.3717942

Hippothoa watersi Morris, 1980 (Fig. 10I, J) Hippothoa flagellum: Gordon & Ryland 1977: 22 (part), fig. 3H; Gordon 1984: 111, text-fig. 10E, pl. 43E–G; Moyano 1986: 102, pl. 2; Gordon 1989: 25, pl. 11E–G; Gordon et al. 2009: 291. Non Hippothoa flagellum Manzoni, 1870. Material examined. NIWA 3795, Stn KAH0204/09, 34.1113° S, 174.1382° E, 562–600 m; NIWA 3797, Stn KAH0204/27, 34.1202° S, 174.0940° E, 540–554 m; NIWA 23400, 49.6132° S, 178.7777° E, 287–350 m; NIWA 92725, Stn W511, 43.2417° S, 175.4583° E, 84–88 m; NIWA 127732, Stn Z18000, 46.9400° S, 168.1550° E, 42 m; NIWA 144795, Stn Z9677, 34.3690° S, 172.8250° E, 55 m; NIWA 144801, Chatham Islands 1954 Expedition Stn 24, 43.6033° S, 176.8083° W, 69 m; NIWA 144804, Cape Turnagain, 40.4933° S, 176.6100° S, 0.5 m. Also H. flagellum (part NHMUK 97.5.1.793, Falmouth). Remarks. Hippothoa flagellum, first described from the Italian Pliocene, has been accorded a virtually global Recent distribution, ranging from Norway to West Africa (Hayward & Ryland 1999) and the South Atlantic (Morris 1980), the southeastern United States and Caribbean, the Pacific Ocean from Japan, Hawaii, California and Mexico (Morris 1980), New Zealand (Gordon 1984, 1989), Chile (Moyano 1986) and Antarctica (Hayward 1985). Morris (1980), however, distinguished New Zealand and Australian material as a separate species, particularly highlighting the narrower, almost ‘triangular’ shape of the autozooidal orifice (Fig. 10I). SEM images show that, immediately proximal of the sinus, there is a slight channel between two slight elevations. The female orifice is weakly sinuous, with a median concavity flanked by a pair of slight transverse elevations (Fig. 10J). SEM comparison of New Zealand specimens with a colony of H. flagellum from Falmouth, England shows consistent differences that justify Morris’ decision—not only is the autozooidal orifice in H. flagellum less tapered (Fig. 10G), the proximal orificial rim of the female zooid (Fig. 10H) lacks the slight eminences that confer the ...