Seven new genera and thirty-four new species of buccinoid gastropods (Neogastropoda: Buccinidae) from the Aleutian Islands, Alaska Author Mclean, James H. Author Clark, Roger N. text Zootaxa 2023 2023-09-26 5351 2 151 201 http://dx.doi.org/10.11646/zootaxa.5351.2.1 journal article 270509 10.11646/zootaxa.5351.2.1 b3b05d51-3aeb-49c7-bbc1-0365bc92c886 1175-5326 8391375 F34F6B3C-F251-4D8E-B002-A96BD70CA1BE Castaneobuccinum pagodaformis n. sp. Figures: 21 J–L urn:lsid:zoobank.org:act: 33993961-8A73-429B-8992-3D8BB5DA8AB0 Type locality: Amutka Pass , Aleutian Ids., Alaska (52°29.4 N, 171°), 469 m . (23-200001-52). Type material: Holotype , LACM 3593 , 64.0 mm. ( leg. K. Maslenikov , 31 May , 2000) Paratypes : Pt 1, LACM 3662 , 37.5 mm (type locality); Pt 2, SBMNH 183015 , 54.5 mm . (type locality); Pt 3, LACM 3661 , 50.4 mm . S of Agattu Island, Near Ids. ( 52°19.15 N , 173°29.8 E ), 93 m ( RB 86–211 ); Pt 4, RNC 4231 , 79.5 mm . Petrel Bank , Rat Ids. ( 52°05.67 N , 179°22.78 E ), 312 m . ( NMFS 94-200201 - 174 ) . Referred material: 1, RNC 4671 , S of Buldir Island ( 51°57.82 N , 176°01.82 E ). ( NMFS 147-200401 - 188 ) 72 m , 62.5mm . Description: Shell relatively large for genus (to 80 mm , RNC 4231), tall spired, strongly keeled; dark brown with lighter tone on spiral cords. Protoconch with two whorls; teleconch with six to seven whorls. Axial sculpture lacking. Spiral sculpture dominated by one strongly projecting shoulder cord beginning as a sharp carination on the first teleconch whorl, becoming T-shaped in cross-section on adult whorls; shoulder ramp convex. A second cord of lesser strength just above the suture; base with one weaker cord; entire surface with incised spiral striae. Aperture large, oval, about 1/3 of shell height; outer lip massively thickened, with indentation reflecting the cords, and broad, shallow sinus on shoulder; canal very short, narrow. Radula: Typical for genus, rachidian tooth sub-rectangular, posterior edge strongly indented; bearing five uniform, well-spaced cusps. Lateral teeth large tri-cuspid, Outer cusp long, slender, curved; middle cusp about half the length of the outer one, slender; inner cusp about 2/3 as long as outer one, very broad, curved. Remarks: This species shows strong similarities with Casteobuccinum triplostephanum (Dall, 1919) , but differs in the much stronger ribs, the primary one (and sometimes the sutural one) of which is T-shaped in section, as well as in the details of the radular teeth. Etymology: Named for its pagoda-like form. Distribution: Central and western Aleutians, Seguam Pass, SE of Seguam Id. ( 170°30 W ) to S of Agattu Id., Near Ids. ( 173°30 E ). 72– 469 m . Habitat: Sand, gravel and cobble bottoms with a bottom temperature of 3.7–3.8°C.