Profil taxonu


Trachypollia lugubris (C.B. Adams, 1852)

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Trachypollia lugubris

Autor: Radwin & D'Attilio

Trachypollia lugubris

Autor: Radwin & D'Attilio

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The shell is moderately large (maximum length 18 mm) and fusiform. The spire is quite high, consisting of three and one-half nuclear whorls and five or six subangulate postnuclear whorls (see Burch, 1940), The suture is well-defined. The body whorl is moderately large and fusoid. The aperture is moderately large and broadly ovate, with a narrow, deep anal sulcus. The outer apertural lip is thin and minutely crenulate at its margin, reflecting the spiral sculpture; the inner surface of the outer lip bears six weak denticles recessed into the aperture, each corresponding to the trough between two major spiral cords. The columellar lip is completely adherent, bearing a small knob delimiting the parietal extent of the anal sulcus, and a series of three moderately strong denticles at its anterior end; of these three denticles the anterior two are closer together. The siphonal canal is moderately short, open, and bent to the left.
The shell is essentially nonvaricate. Axial sculpture consists of eight to ten costae with shallow interspaces, the costae most prominent over the major spiral cords. Spiral sculpture consists of primary, secondary, and tertiary scabrous cords: the shoulder bears three or four undulate tertiary cords; one primary cord is evident immediately subsuturally, a pair are at the shoulder margin, and three single primaries are distributed evenly over the lower half of the body; between the pair of primary cords at the shoulder margin and the primary immediately below them, and between each two succeeding primaries, are three secondaries, the outside two each appended to the neighboring primary; two secondary cords are found at the top of the siphonal canal; the bottom half is smooth. Where the primary cords intersect the axial costae, small, sharp nodules are developed. Shell color is light tan to pale fleshy brown on the shell and in the aperture. The nodules are dark red-brown. Considerable variation in size and overall proportions may be found, particularly in association with geographical (i.e. population) differences.
Radwin, G.E. & D'Attilio, A., 1976. Murex Shells of the World. An Illustrated Guide to the Muricidae.


Redondo Beach, California (Burch, 1940), to Panama.
Radwin, G.E. & D'Attilio, A., 1976. Murex Shells of the World. An Illustrated Guide to the Muricidae.

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