Description
Author: Jan Delsing
Text ID: 103741
Text Type: 1
Page: 0
Created: 2020-12-04 21:57:54 - User Delsing Jan
Language: EN
Text function: [[t:488612,textblock=103741,elang=EN;Description]]
Large to very large, moderately depressed cone-shaped shell with moderately wide umbilicus; whorls on upper side rather smooth, somewhat inflated; only one spiral groove below suture (i.e., midrib-area undivided); no wide groove below the axially grooved midrib-area and upper peripheral rib. Subsutural rib white with brown spiral band on upper half, upper midrib-area with dark-brown spiral band, and umbilical crenae colored dark-brown. Protoconch diameter ^ 1.00 mm.
Teleoconch: Large to very large, diameter of specimens in collections usually 35-59 at 7 to 9+ whorls. Shape: moderately depressed cone-shaped, with whorls somewhat inflated (especially on upper side); umbilicus moderately wide (UD ca. 24% of SD). Sculpture: Upper side: SSR distincdy separated; MR-area not separated into individual ribs; Periphery: UPR and LPR strong, with LPR less wide and somewhat more prominent; in most specimens one additional narrow spiral rib between UPR and LPR; upper point of whorl attachment usually between UPR and LPR, thereby forming a shallow suture; upper side and periphery crossed by deeply incised oblique axial grooves, resulting in formation of many elongate oblique segments, becoming smooth on MR-area of body whorl of larger specimens; Base: IPR strong; usually one additional narrow spiral rib between LPR and IPR; BF without spiral ribs; with radiating plications (especially in younger specimens), stronger towards umbilicus; two distinctly separated nodulose spiral ribs (PUR and UC) surrounding umbilicus, with umbilical crenae wide and strongly nodulose; columellar wall forming almost straight inner lip with plications for support of the columellar muscle, with deepest groove in umbilical crenae overhanging umbilicus; no spiral sculpture on umbilical side of wall. Coloration: SSR white with ± distinctly separated brown spiral band on upper half; upper 1/4 to 1/3 of MR-area with dark-brown spiral band (dissolving into irregularly light- and dark-brown variegated band on body whorl of larger specimens); remaining MR-area greyish-brown; UPR, LPR and IPR white with ± sharply outlined, rectangular dark-brown pattern (with LPR lighter colored); BF greyish; a spiral band of small brown blotches in front of PUR; PUR white, sometimes with light-brown marks; UC dark-brown. - Protoconch: small to medium-sized (0.66-1.0, x = 0.85); distinctly heterostrophic; anal-keel weak to well-developed; whitish to light-brown, with brown outer corner in front of varix and usually with short central brown band, starting shortly before varix (and continuing on teleoconch as brown spiral of upper MR-area).- Operculum: as described for genus. - Radula: "ptenoglossate," with 28 long, recurved, prong-like teeth per row (14-0-14), with the outer ones being shorter and forked with long tapering subequal cusps. Soft-body coloration of living animal: white tentacles with two black longitudinal stripes each, running from their tips to the upper part of the head; remaining anterior body white with sparse brown pigment in lateral foot region.
Bieler, R. (1993). Architectonicidae of the Indo-Pacific (Mollusca, Gastropoda).
Author: Jan Delsing
Text ID: 118479
Text Type: 1
Page: 0
Created: 2022-09-30 15:30:01 - User Delsing Jan
Language: EN
Text function: [[t:488612,textblock=118479,elang=EN;title]]
Height, 12 mm; diameter, 45 mm. Shell: depressed-turbinate; solid; with a single broad cord encircling the last whorl; fawn, continuous spiral bands of brown around the suture and periphery. Spire: five whorls; suture channeled. Sculpture: three rows of beaded granular spirals on the apical whorls, the middle row the widest and composed of oblique rectangular nodules; a fourth granular spiral on the last whorl. Aperture: subcircular, operculum large, flat, paucispiral externally and with a twisted central projection internally; base axially striate; umbilicus wide and deep, bordered by two crenulated spirals. Color: fawn, with two continuous or interrupted brown spirals on the apical whorls; base fawn with brown spots on the spiral sculpture.
Specimens of this species have been dredged at depths of from 30 to 50 m. As in A. maxima, juveniles are occasionally found in the umbilicus.
A. perspectiva occurs throughout the Indo-West Pacific.
Kay, E.A., 1979. Hawaiian Marine Shells. Reef and Shore Fauna of Hawaii. Section 4: Mollusca.
Distribution
Author: Jan Delsing
Text ID: 103742
Text Type: 3
Page: 0
Created: 2020-12-04 21:58:46 - User Delsing Jan
Language: EN
Text function: [[t:488612,textblock=103742,elang=EN;Distribution]]
Geographical distribution: Continous range throughout subtropical and tropical Indo-West and Central Pacific.
Habitat: Sublittoral (most depth records between 10 and 120 m), live records from 10-65 m, sandy and muddy substrates.
Bieler, R. (1993). Architectonicidae of the Indo-Pacific (Mollusca, Gastropoda).