Phylo nudus ( Moore, 1911 )

Blake, James A., 2020, New species and records of deep-water Orbiniidae (Annelida, Polychaeta) from the Eastern Pacific continental slope, abyssal Pacific Ocean, and the South China Sea, Zootaxa 4730 (1), pp. 1-61 : 28-29

Phylo nudus ( Moore, 1911)

Aricia nuda Moore, 1911: 311–315 , pl. 21, figs 172–176.

Phylo nudus: Hartman, 1957: 268 ; 1969: 39–40, figs. 1–4; Blake 1996: 13, Fig. 1.4; Imajima 1997: 188–189, Fig. 11 a–l; 2009: 113.

Material examined. Continental slope off central California, Point Conception , US DOE, MMS Benthic Reconnaissance Survey, Sta. 078 BSS-1, 09 Nov 1983, coll. SAIC, 34°18.775′N, 120°49.301′W, 774 m, 1 specimen

( USNM 1594175 ).— off northern California, US EPA 102 Site Selection Survey , off Half Moon Bay , R / V Point Sur , coll. J.A. Blake: north of Pioneer Canyon , Sta. 3-17, 15 Sep 1991, 37°22.18′N, 123°16.76′W, 1457 m, 1 specimen ( CASIZ 234028 ) ; south of Pioneer Canyon, Sta. 4-4, 18 Sep 1991, 37°16.13′N, 123°14.18′W, 1427 m, 1 specimen ( CASIZ 234027 ) ; Pioneer Canyon, Sta. C-3, 19 Sep 1991, 37°20.21′N, 123°08.84′W, 1400 m, 1 speci- men ( CASIZ 234036 ).— Eastern Pacific Ocean, west of Costa Rica, R / V V ema, coll. Lamont-Doherty Geological Observatory, Sta. V-15-20, 22 Nov 1958, 09°18′N, 89°32′W, trawl, 3501–3503 m, 1 specimen ( LACM-AHF Poly 5006) ; Sta. V-15-50, 22 Nov 1958, 09°18′N, 89°32′W, trawl, 3501–3503 m, 1 specimen ( LACM-AHF Poly 5007) ; Sta. 15-52, 23 Nov 1958, 09°20.5′N, 89°39′W, trawl, 3475–3497 m, 1 specimen ( LACM-AHF Poly 5004) .

Remarks. Phylo nudus differs from other species of the genus in lacking a fringe of subpodial or stomach papillae extending across the venter of the thoracic region. In addition, the modified neuropodial spines of the posterior

thoracic region are relatively simple, differing from the spear-like spines of related species. The morphology of these specimens agrees well with the most recent description of the species by Blake (1996).

Although P. nudus is an offshore species known from shelf and slope depths, the present specimens from off Costa Rica in 3475–3503 m represent the deepest records for this species.

Distribution. Eastern Pacific Ocean, California to Costa Rica, 760–3503 m; western Pacific Ocean, off Japan, 230– 510 m.

Figures

FIGURE 11. Califia calida Hartman, 1957. (CASIZ 234031): A, anterior end, dorsal view. (CASIZ 234031): B, anterior end, ventral view. (CASIZ 234040): C, setiger 2, anterior view; D, middle abdominal setiger, anterior view; E, long, smooth neuropodial spine from setiger 2; F, short, ribbed neuropodial spine, setiger 2; G, abdominal notopodial furcate seta; H, posterior end, dorsal view.