Philinorbis albus Mattox 1958, comb. nov.

Philinorbis albus (Mattox, 1958) comb. nov.

Figure 4

Philine alba Mattox 1958: 98, pl. 33, figs. 1–3.

Type material. Holotype (LACM 2072): About 1.8 miles southeast of Long Point, Santa Catalina Island, California (33º22.9’N, 118º20.7’W), 64 m depth, R/ V Velero IV, 25 June 1954, 55 mm preserved length (Fig. 4 D).

Paratypes (LACM 2014): About 1.8 miles southeast of Long Point, Santa Catalina Island, California (33º22.9’N, 118º20.7’W), 64 m depth, R/ V Velero IV, 25 June 1954, 17 specimens, 37–48 mm preserved length.

Other material examined. Off Point Pinos, California (36°38’N, 122°02’W), 182 m depth, R/ V Tage, 26 Nov 1963,> 20 specimens, preserved 3.9–4.5 mm long, leg. McLean (LACM 63-52.5); 1shell, 1.6 mm long, leg. McLean (LACM 60-21.30). Off Hopkins Marine Station, Pacific Grove, California (36°37.5’N, 121°54’W), 36 m depth, 1960–64, 1 shell, 1.0 mm long, leg. McLean (LACM 60-23.41). Gaviota, California, 164 m depth, Mar 1967, 1 shell, 28.1 mm long, leg. Brophy (LACM 10592). 1 mile northwest of the west end of Anacapa Island, California (34°01’43”N, 119°27’20”W), 69–78 m depth, 24 Mar 1950, 3 specimens, preserved 2.1–4.5 mm long (LACM 50-17.9). 8 miles west of Hermosa Beach, California, 73 m depth, 1965, 4 shells, 1.5–2.2 mm long (LACM 178899). 6.5 miles due east of Hyperion, California, 137–146 m depth, 2 shells, 3.8 mm long, leg. Baxter (LACM 172458). 3 miles east southeast of Ship Rock, Santa Catalina Island, California (33°26’49”N, 118°26’15”W), 95–118 m depth, 16 Sept 1954, 4 specimens, preserved 3.5–4.5 mm long (LACM 54-76.13). 1.5 miles southeast of Long Point, Santa Catalina Island, California (33°23’48”N, 118°21’16”W), 69–84 m depth, 28 Feb 1953,> 10 specimens, preserved 3.3–3.7 mm long (LACM 53-11.6). 1.2 miles from Long Point, Catalina Island, California (33°23’N, 118°13’W), 68 m depth, R/ V Velero IV 10329, 13 Feb 1965, 6 specimens, preserved 1.8–2.6 mm long (LACM 65-5.11). 1.8 miles southeast of Long Point, Santa Catalina Island, California (33º22.9’N, 118º20.7’W), 64 m depth, R/ V Velero IV, 25 June 1954, 4 shells, 14–28 mm long (LACM 01118). 0.5 miles east of Abalone Point, Santa Catalina Island, (33°20’25”N, 118°18’30”W), 80–84 m depth, 12 June 1941, 7 specimens, 1 shell, preserved 2–4.3 mm long (LACM 41-136.4). 4 miles southeast of the east end of Santa Catalina Island, California (33°16’12”N, 118°14’22”W), 186–204 m depth, 24 July 1952,> 10 specimens, preserved 1.8–3.2 mm long (LACM 52-16.7). 5.5 miles southeast of Santa Catalina Island, California (33°15’22”N, 118°12’37”W), 265–274 m depth, 20 Aug 1940, 1 specimen, preserved 2.2 mm long (LACM 40-146.7).

Description. Live animal to 60 mm, creamy white to pale brown, short and wide (Fig. 4 A). Cephalic shield longer than posterior shield (Figs. 4 A, D). Shell to 30 mm long, internal, flat, smooth (Figs. 4 B–C). Inner whorl reduced, lacking a coil, bearing weak shelly projection for muscle attachment. Lip projecting above and left of remnant of shell axis forming a conspicuous wing. Periostracum thin.

Radular formula 14–24 x 2.1.0/1.1.2. A row of vestigial rachidian teeth may be present (Fig. 4 E). Inner lateral teeth smooth or with up to seven small denticles, Outer teeth small, hook-shaped, smooth.

Gizzard not muscularized, with three small, equally sized, oval gizzard plates (Fig. 4 F–G).

Range. In North America from Monterey Bay, California to central Baja California (Fig. 3 A). Price et al. (2011) also reported this species from the Galapagos Islands. Depth range 36–274 m.

Remarks. Mattox (1958) and Price et al. (2011) provided full anatomical descriptions of this species.

See Mattox (1958) and Price et al. (2011) for a full description.