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Admete verenae M.G. Harasewych & R.E. Petit, 2011

říše Animalia - živočichové »  kmen Mollusca - měkkýši »  třída Gastropoda - plži »  řád Neogastropoda »  čeleď Cancellariidae - kancelárkovití »  rod Admete - kancelárka

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Admete verenae

Autor: Harasewych & Petit
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Popis

Shell moderately large (to 25.6 mm), thin, with tall, stepped spire (spire angle 44-51°), broadly ovate aperture, and short, tapering siphonal canal. Protoconch unknown, early whorls eroded in all specimens. Teleoconch of 6+ weakly shouldered whorls, becoming more rounded with increasing shell size. Suture minutely impressed. Spiral sculpture of: 2-3 weak cords between suture and shoulder; strong cord along shoulder; 16-18 low, broad, rounded cords between shoulder and siphonal canal; 3-4 finer cords on siphonal canal. Cords slightly broader than intervening spaces, both cords and intervening spaces becoming progressively narrower toward siphonal canal. Five cords between suture and shoulder of penultimate whorl. Axial sculpture of very fine prosocline growth lines. Weak axial ribs producing tubercles along spiral cord on shoulder (18-20 per whorl) present in uneroded portions of first 3-4 whorls. Aperture broadly ovate, broadest just below shoulder, tapering anteriorly, deflected from coiling axis by 18-22°. Outer lip broadly rounded, weakly corrugated, reflecting spiral sculpture. Parietal region nearly straight to weakly rounded, forming angle of 132-136° with columella at siphonal fascicole. Columella very weakly sigmoidal, nearly straight with 1 2 barely perceptible columellar folds. Inductural area with thin glaze to weak callus that continues along columella, flaring over pseudoumbilicus before forming weak siphonal fold at juncture with siphonal canal. Siphonal canal short, broad, slightly deflected to the right, forming distinctive siphonal fasciole. Shell color white to cream inside and out. Periostracum thin, lamellose, yellowish to amber in color. Shell strongly eroded, reinforced from within in areas where periostracum worn or absent. Operculum absent.
Source: Harasewych, M.G. & Petit R.E., 2011. Two new species of Admetinae (Gastropoda Cancellariidae) from the northeastern Pacific Ocean.

Možné záměny

Admete verenae is readily distinguished from its congeners by its large size, high spire, anteriorly tapering aperture with a short siphonal canal slightly deflected to the right, and conspicuous siphonal fasciole. Admete viridula (Fabricius, 1780) and several nominal species to which it is closely related have axial sculpture on the early whorls that sometimes con¬tinues onto the posterior portion of later whorls. Admete regina Dall, 1911, which may be as large or larger, has a weak siphonal fasciole, but differs in having a much broader, generally heavier shell with a proportionally shorter spire, much weaker and finer spiral sculpture, and a much larger, rounder aperture with a concavely curved columella. Admete bruuni Knudsen, 1964, from 6660-6770 m in the Kermadec Trench, is similar in size, but has a very thin shell with numerous (50) very fine and faint spiral threads, a larger, more evenly ovate aperture, and a lon¬ger siphonal canal that crosses the coiling axis of the shell and lacks a siphonal fasciole.
Source: Harasewych, M.G. & Petit R.E., 2011. Two new species of Admetinae (Gastropoda Cancellariidae) from the northeastern Pacific Ocean.

Rozšíření

North East Pacific. Type Locality: Chowder Hill, Middle Valley, Juan de Fuca Ridge.

Odkazy a literatura

EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [jako Admete verenae Harasewych & Petit, 2011]
Datum citace: 22. listopad 2013

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