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Arene echinata McLean, 1970
Scaly Turban
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synonymy
:
usual size : Height and diameter : 7.5 to 9 mm ( 0.3 to 0.35 inch )
Description
Small turbinate shell, although it is the largest of the genus in the eastern Pacific. Rounded whorls sculptured with spiral cords and fluted scales projecting sharply on cords. Suture deeply channeled. Color pinkish brown with lighter areas.
Habitat & range
Intertidal and subtidal, down to 275 m, on sand, rock, or light rubble. Cocos Island, Costa Rica; Galápagos Islands ( type locality ).
Original description ( from McLEAN, 1970a : 311 ) :
“ Shell large for the genus, sturdy but not massive, rounded - turbinate, umbilicate, suture deeply channeled. Nucleus of 1 whorl, postnuclear whorls 5, spiral sculpture on the early whorls consisting of 3 strong cords with sharply projecting scales. A 4 th strong spiral cord emerges above the suture on the penultimate whorl and 2 secondary cords emerge in the channels adjacent to the middle primary cord. On the last whorl just behind the lip all cords are of nearly the same size and counting from the suture to umbilicus there are 12 cords, including 2 that spiral deep within the umbilicus. Axial sculpture of fine growth lamellae, about 7 layers occur bewteen each 2 projecting scales on the spiral cords. Aperture circular, nacreous within, outer lip having weak denticles within. Lip mature but not thickened, abruptly dipping downward at the suture. Color pinkish brown, with irregular lighter mottling. Operculum unknown. Height, 8.5 mm, diameter, 8.0 mm.”
Remark :
Bibliography relevant to occurrence in Galápagos
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Mc LEAN, 1970a ( original description; Galápagos = type locality ); Mc LEAN in KEEN, 1971; FINET, 1985; FINET, 1991; KAISER, 1993; FINET, 1994b; FINET, 1995a; KAISER, 1997; HICKMAN & FINET, 1999.
Material from Galápagos in museums or other collections
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| AMNH | 154626 ( holotype ), 154627 ( paratype ). |
| LACM | 1277 ( 1 - 2 ) ( paratypes ), 33-157.2, 33-166.4, 33-171.1, 33-174.2, 34-265.7, |
| 34-264.2 ( previously misidentified as Arene ferruginosa ), 34-270.1, 34-273.2, | |
| 34-276.2, 34-277.1, 34-279.3, 34-281.3, 34-282.3, 34-285.2, 34-287.1, 34-289.2, | |
| 34-290.5, 34-295.1, 34-302.3, 66-211.5, 72-196.8, 84-28.6, 84-41.9, 84-43.3. |
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