Buccinum katharinae, 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 : 199

Buccinum katharinae n. sp.

Figures 22 J–K

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Type locality: Amutka Pass, SE of Seguam Island, Aleutian Is. , Alaska (52°22.5 N, 171°20.26 W) ( NMFS 23-2000 - 1-83 ), 325 m.

Type material: Holotype, LACM 3595 , 29.2 mm ; Paratype, Pt 1, RNC 5061 , 34.8 mm. N of Carlisle Island , Islands of four Mountains (53°04.73 N, 170°08.43 W), 177 m. ( NMFS 148-2022 - 1-32 ) .

Description: Shell relatively small (to 35 mm, RNC 5061) whorls rounded, suture moderately impressed; shell brown with lamellar, brown periostracum; protoconch with 1.5 whorl, 4.5 teleconch whorls. Axial sculpture lacking, spiral sculpture of two strongly projecting spiral cords on spire; interspaces of equal width, deeply channeled, surfaces of cords and interspaces with microscopic, raised lirae; base with three additional cords of lesser strength, suture laid on uppermost of these. Lip of holotype thin, immature; lip; paratype specimen with a complete, but lip, which is scarcely if at all thickened. Operculum small, filling about 25 % of aperture.

Rachidian tooth rectangular, with four short, weak cusps; Lateral teeth tri-cuspid, Outer cusp very long, curved; widely spaced from central and inner cusps; central cusp very small, less than half as long and broad as inner cusp; inner cusp about half as long as outer one, slightly curved.

Remarks: For many years this unique species was known only from the holotype, but during the review process a second specimen was recovered. Buccinum katharinae is similar to Buccinum eugrammatum Dall, 1907 , but differs in 1) the fewer spiral cords, two on spire, and five total compared with five on spire and eight total in B. eugrammatum , and 2) lack of periostracum in B. eugrammatum .

Etymology: Named for Katharine Pearson Maslenikov, taxonomist, at the University of Washington, who collected the holotype.

Distribution: Central Aleutian Islands, Amutka Pass (171°20 W), to the Islands of four Mountains (170° W), at depths of 177– 325 m.

Habitat: Volcanic sand and mud bottoms.

Figures

FIGURE 22. A, B. Sulcosinus carinatus n. sp. A. Holotype, LACM 3594, S of Kiska Island, 470 m, 46.8 mm; B. Radula, Holotype, bar = 200 µm; C–E. Sulcosinus taphrium (Dall, 1891); C. Holotype, USNM 122548, N of Akutan Island, 642 m, 42 mm; D. RNC 4000, SW of Saint George Island, 485 m, 45.5 mm; E. Radula, RNC 4000, bar = 200 µm; F, G.–Buccinum lanatum n. sp.; F. Holotype, SBMNH 169021, SW of Herbert Island, 238 m, 42 mm; G. Radula, Holotype, bar = 200 µm; H. Buccinum tunicatum Golikov & Gulbin, 1977, Holotype ZIN 26225/1, Urup Island, Kurile Is., Russia, 48 m, 27 mm; I. Buccinum fringillum Dall, 1877, RNC 4824, Chukchi Sea, 22 m, 23 mm; J, K. Buccinum katharinae n. sp.; J. Holotype, LACM 3595, Amutka Pass, 325 m, 29.2 mm; K. Radula, Holotype, bar = 200 µm.