Protodiopatra willemoesii Budaeva & Fauchald, 2011

Budaeva, Nataliya & Fauchald, Kristian, 2011, Phylogeny of the Diopatra generic complex with a revision of Paradiopatra Ehlres, 1887 (Polychaeta: Onuphidae), Zoological Journal of the Linnean Society 163 (2), pp. 319-436 : 414-415

PROTODIOPATRA WILLEMOESII ( MCINTOSH, 1885) COMB. NOV. ( FIGS 86–91 ; TABLE 17)

Nothria willemoesii McIntosh, 1885: 322–327 , pl. 26A, figs 1–4; pl. 35A: fig. 1; pl. 41, figs 4–10.

Onuphis willemoesii Izuka, 1912: 101–103 , pl. 1, fig. 7; Takahashi, 1938: 206, pl. 20E; Imajima & Hartman, 1964: 246–247.

Sarsonuphis willemoesii Fauchald, 1982: 79 .

Paradiopatra willemoesii Paxton, 1986a: 38 . Imajima, 1999: 92–95, figs 50–53; Imajima, 2001: 74.

Type material: BMNH 1885.12 .1.212, Challenger (no station reported) Pacific Ocean, off Indonesia, off Amboina, dredge, 183 m (holotype) .

Non-type material examined: BMNH 1921.5 .1.1877, the same locality as holotype (tube) ; BMNH 1879.12 .17.20, Japan, 34.183°N, 136.55°E, 130 m (tube) ; NSMT Pol-107584, Japan, off Nagai , Sagami Bay, 40 m (one) ; USMN 19009 , Albatross , St. 5394 (one) ; ZIN 3 /12018, Pelamida (no station reported), South China Sea, Gulf of Tonkin, 56–77 m, 1960, coll. Gurjanova, E.F. (four) ; ZIN 5 /12020, Orlik (no station reported), South China Sea, Gulf of Tonkin, 67 m, 28 October 1960 (two) ; ZIN 7 /12022, Pelamida (no station reported), South China Sea, Gulf of Tonkin, coll. Gurjanova, E.F. (three) ; ZIN 8 /12038, Pelamida , St. 11, 22.10.1960 (three) ; SIO RAS, Pelamida St. 39 (two); St. 43 (one); St. 73 (three); Orlik St. 211, South China Sea, Gulf of Tonkin, 18°N, 110.3°E, 136 m, Sigsbee trawl, 13 July 1960 (three) ; ZMUC, 22°N, 114.5°E, 31 m, December 1882, coll. Suensson (one) .

Type locality: Pacific Ocean , off Indonesia, off Amboina, 183 m.

Diagnosis: Median antenna thicker and longer than lateral ones; first four pairs of parapodia modified with subulate ventral cirri and pseudocompound bidentate falcigers with moderately long pointed hoods; postchaetal lobes present on all chaetigers; subacicular hooks starting from chaetigers 15–21; branchiae pectinate, starting from chaetigers 11–18 and continuing to the end of the body; peristomial cirri present; tube with long thin spines attached to distal slightly curved end.

Description: All specimens lacking posterior ends; one posterior end with pygidium present in the material examined. Holotype 1.9 mm wide and about 50 mm long in two fragments: anterior part consisting of 21 chaetigers and posterior part consisting of 52 chaetigers. Prostomium and first few chaetigers of holotype have been dissected, and some parts are missing. Non-type specimens ranging from 1.3 to 6.5 mm in width (mean value 2.4 mm). The most complete specimen consisting of 286 chaetigers, and about

Figures

Figure 86. Protodiopatra willemoesii comb. nov. (SIO RAS, Pelamida 1961 St. 73): A, anterior end, dorsal view; B, anterior end, ventral view; C, maxillae; D, mandibles (cutting plates missing); E, parapodium of chaetiger 2, anterior view; F, parapodium of chaetiger 4, anterior view; G, parapodium of chaetiger 14, anterior view; H, parapodium of chaetiger 16, anterior view.

Figure 87. Protodiopatra willemoesii comb. nov. (SIO RAS, Pelamida 1961 St. 73): A, tube, anterior end; B, parapodium of chaetiger 43, anterior view; C, parapodium of chaetiger 54, anterior view; D, parapodium of chaetiger 116, anterior view; E, bidentate pseudocompound falciger from chaetiger 4; F, subacicular hook from chaetiger 43; G, pectinate chaeta from chaetiger 116.

Figure 88. Protodiopatra willemoesii comb. nov. Relationship between body width of specimens (N = 21) and origin of subacicular hooks (SAHs) (y = 0.19x + 16.04; R2 = 0.0249; P = 0.4948).