Philinorbis albus ( Mattox, 1958 ) Mattox, 1958

Valdés, Ángel, Cadien, Donald B. & Gosliner, Terrence M., 2016, Philinidae, Laonidae and Philinorbidae (Gastropoda: Cephalaspidea: Philinoidea) from the northeastern Pacific Ocean and the Beaufort Sea (Arctic Ocean), Zootaxa 4147 (5), pp. 501-537 : 507-508

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.

Figures

FIGURE 3. Distribution maps of the specimens studied in this paper (native species only).

FIGURE 4. Philinorbis albus (Mattox, 1958). A. Live animal from Southern California (photo: Megan Lilly), dorsal view. B – C. Ventral and dorsal view of a 28.1 mm long shell from Southern California (LACM 10592). D. Preserved holotype (LACM 2072), dorsal view. E. Radula of a specimen from Southern California (CASIZ 076681). F – G. Gizzard plates, same specimen.