Aulacofusus canaliculatus, Mclean & Clark, 2023

Mclean, James H. & Clark, Roger N., 2023, Seven new genera and thirty-four new species of buccinoid gastropods (Neogastropoda: Buccinidae) from the Aleutian Islands, Alaska, Zootaxa 5351 (2), pp. 151-201 : 174-175

Aulacofusus canaliculatus n. sp.

Figures 14 A–B urn:lsid:zoobank.org:act:813CFA64-9AC0-4A33-900C-B1D7264F6B0A

Type locality: SE of Agattu Island, Near Ids., Aleutian Is. , Alaska (51°47.79 N, 174°45.8E), 135 m. ( NMFS 94- 200201 - 143 ) .

Type material: Holotype, LACM 3667 , 66.6 mm. (leg. RNC, 3 July, 2002, trawled, R/ V Vesteraalen) ; Paratypes: Pt 1, RNC 4143 , 53.3 mm. S of Buldir Island (51°57.82 N, 176°01.72 E), 71 m. ( NMFS 23-200001 - 226 ).; Pt 2, SBMNH 169005 , 56.24 mm. S of Atka Island , Andreanof Ids. (52°06.15 N, 175°53.53 W), 92 m. ( NMFS 143- 200401 - 94 ) .

Referred material: 1, RNC 4141 , 47.8 mm. N of Atka Island , Andreanof Ids. (52°08.14N, 175°07.59 W), 107 m. ( NMFS 23-200001 - 103 ); 1 , RNC 4099 , 63.4 mm. S of Buldir Island (51°58.38 N, 176°05.04 E), 85 m. ( NMFS 23-200001 - 227 ); 1 , RNC 4568 , 55.3 mm. Petrel Bank , Andreanof Ids. (52°04.19 N, 179°41.25 E), 75 m. ( NMFS 143-201201 - 134 ) .

Description: Shell of medium size (to 6.7 cm, holotype), elongated fusiform, rather slender, tall spired; cream to orange-brown, cords typically darker; periostracum absent. Protoconch with two whorls; six teleconch whorls, early whorls with five cords; whorls rounded. Spiral cords strong, rounded in cross-section, five to six on penultimate whorl, and seven similar but smaller cords on the base, channels between cords about as wide or wider than cords. Aperture short, a little more than 1/3 of shell height, oval; canal constricted, relatively long, slender.

Radula: Unknown.

Remarks: This species is similar to Aulacofusus periscelidus (Dall, 1891) (figs. 14 C–D), but differs in the more numerous (6–7 opposed to 4–5), lower, spiral cords which are rounded in cross-section. It also resembles Aulacofusus brevicauda (Deshayes, 1832) from which it differs in the much fewer spiral cords, 6–7 opposed to 14–16 in A. brevicauda .

Etymology: From the Latin, canaliculata , channeled, in regards to the deep channels between the spiral ribs

Distribution: Central and western Aleutians, from Buldir Island (176°E) to S of Atka Island, Andreanof Ids. (174°W), at depths of 71– 135 m.

Habitat: On black sand and bedrock bottoms with a bottom temperature of 4.4–4.9°C.

Figures

FIGURE 14. A–D. Aulacofusus canaliculatus n. sp. A. Holotype, LACM 3667, SE of Agattu Island, 135 m, 66.6 mm; B. Paratype, RNC 4143, S of Buldir Island, 71 m, 53.3 mm; C. Aulacofusus periscelidus (Dall, 1891), RNC 4860, W of Hawadax (Rat) Island, 94 m, 77.47 mm; D. RNC 4625, Adak Island, 18 m, 69.1 mm; E–G. Aulacofusus tanagaensis n. sp.; E. Holotype, LACM 3665, W of Tanaga Island, 53 m, 54.9 mm; F. Paratype, RNC 4585, W of Tanaga Island, 95 m, 54.0 mm; G. Radula, paratype, bar = 200 µm.