Profil taxonu
Obrázky
Autor: Mclean, J. H. & Clark, R. N.
Popis
Type locality: Tahoma Bank, W of Buldir Island, Aleutian Is., Alaska (52°26.12 N, 175°40.99 E), 147 m. (NMFS 94-200201-167).
Description: Shell moderately large (to 117 mm, Holotype), slender, nearly fusiform, suture impressed; white to pale tan; periostracum golden-tan. Protoconch with 2.5 whorls, with spiral and oblique cords forming diamond-like lattice; teleconch with 4.5-5 whorls. Axial ribs faint or lacking, but bearing very numerous, fine, close-set, raised axial threads. Spiral sculpture (when present), consists of a few barely detectable cords (on old, thick specimens, i.e., paratype three). Aperture short, much less than half of shell height, canal short, broad.
Radula: Rachidian tooth broader than long, lateral edges rounded, anterior and posterior edges slightly indented. Lateral teeth large, tricuspid; outer cusp thick, tapering, strongly curved, or distal half, and often bearing a small protrusion near the base on the inside, forming a notch between it and the central cusp; central cusp many times smaller than outer one, and slightly curved outward; inner denticle about twice as large as central one, broad, strongly curved inward.
Remarks: This species resembles Beringius incisus (Dali, 1907) [herein recognized as distinct from the variable Beringius kennicottii (Dall, 1871) on account of its fine, regulär, spiral threads], but is distinguished by 1) the lamellar periostracum, and 2) the fine axial threads on the whorls as opposed to spiral threads only in Beringius incisus.
Etymology: Latin, aurulentus, "golden, or made of gold", in reference to the color of the periostracum.
Distribution: Central Aleutian Islands, from Kagamil Pass, Islands of Four Mountains (169°50' W) to Tahoma Reef, W of Buldir Island (175°40' E), at depths of 147-321 m.
Habitat: Broken hydrocoral/sponge, and gravel bottoms, with a bottom temperature of 4-4.4°C.
Description: Shell moderately large (to 117 mm, Holotype), slender, nearly fusiform, suture impressed; white to pale tan; periostracum golden-tan. Protoconch with 2.5 whorls, with spiral and oblique cords forming diamond-like lattice; teleconch with 4.5-5 whorls. Axial ribs faint or lacking, but bearing very numerous, fine, close-set, raised axial threads. Spiral sculpture (when present), consists of a few barely detectable cords (on old, thick specimens, i.e., paratype three). Aperture short, much less than half of shell height, canal short, broad.
Radula: Rachidian tooth broader than long, lateral edges rounded, anterior and posterior edges slightly indented. Lateral teeth large, tricuspid; outer cusp thick, tapering, strongly curved, or distal half, and often bearing a small protrusion near the base on the inside, forming a notch between it and the central cusp; central cusp many times smaller than outer one, and slightly curved outward; inner denticle about twice as large as central one, broad, strongly curved inward.
Remarks: This species resembles Beringius incisus (Dali, 1907) [herein recognized as distinct from the variable Beringius kennicottii (Dall, 1871) on account of its fine, regulär, spiral threads], but is distinguished by 1) the lamellar periostracum, and 2) the fine axial threads on the whorls as opposed to spiral threads only in Beringius incisus.
Etymology: Latin, aurulentus, "golden, or made of gold", in reference to the color of the periostracum.
Distribution: Central Aleutian Islands, from Kagamil Pass, Islands of Four Mountains (169°50' W) to Tahoma Reef, W of Buldir Island (175°40' E), at depths of 147-321 m.
Habitat: Broken hydrocoral/sponge, and gravel bottoms, with a bottom temperature of 4-4.4°C.
Mclean, J. H. & Clark, R. N., 2023. Seven new genera and thirty-four new species of buccinoid gastropods (Neogastropoda: Buccinidae) from the Aleutian Islands, Alaska.
Autor: Jan Delsing