Hedgpethia bicornis (Turpaeva, in Losina-Losinsky & Turpaeva, 1958) Fig. 2, Table 1 Colossendeis bicornis Turpaeva in Losina-Losinsky & Turpaeva, 1958: 27–29, 32 [key], 33 [text], fig. 3, tabs 3–5. Colossendeis bicornis – Losina-Losinsky 1961: 109–110. Rhopalorhynchus bicornis – Stock 1970: 9 [key]. Hedgpethia californica – Turpaeva 1973 [partim]: 185 [key], 186–189, tab. 2. Hedgpethia californica bicornis – Turpaeva 1973: 187–189 [text], tab. 3; 2002: 1451 [text], 1451, 1452. — Dudnik & Kremenetskaia (2025): fig. 6d, tab. 1. Hedgpethia bicornis – Stock 1991a: 166 [text]. — Turpaeva 1993: 22 [text]. Type material (not examined) Holotype SEA OF OKHOTSK • sex unknown; northeastern Sea of Okhotsk; depth 1100 m; 3 Oct. 1952; R/V Vityaz cruise 12 stn 1780; IORAS, INV0002674. Paratypes SEA OF OKHOTSK • 2 specs; same data as for holotype; hosting institution unknown • 1 spec.; southern Sea of Okhotsk; 10 Aug 1949; R/V Vityaz; hosting institution unknown • 1 spec.; 1932; R/V Gagara stn 217; hosting institution unknown • 19 specs; 1932; R/V Gagara stn 247; hosting institution unknown • 1 spec.; 1932; R/V Gagara stn 250; hosting institution unknown • 1 spec.; 1932; R/V Gagara stn 261; hosting institution unknown • 2 specs; 1952; R/V Guidrolog; hosting institution unknown. NORTHWESTERN PACIFIC • 2 specs; south of Southern Kuril Islands; 1949; R/V Toporok; hosting institution unknown. Distribution and depth range Sea of Okhotsk (type locality) and east to Kuril Islands. Minimal known depth range 303–1100 m. Remarks Stock (1991a) suggested this species to be a possible junior synonym to Hedgpethia californica (Hedgpeth, 1939), without explicit justification. However, the mediodorsal ornamentation of H. bicornis as well as the low tubercle on the anterior margin of its cephalon distinguish it from H. californica.

Published as part of Sabroux, Romain, 2025, The genus Hedgpethia Turpaeva, 1973 (Pycnogonida: Colossendeidae): a review and a new species, pp. 147-170 in European Journal of Taxonomy 1026 on page 151, DOI: 10.5852/ejt.2025.1026.3111, http://zenodo.org/record/17788428