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Posted: Dec 17 2006, 04:21 PM
Member No.: 2
Joined: 12-November 05
Marshallora modesta (C.B. Adams, 1850)
These images are of a specimen (5.5mm) from Mosquito Lagoon, Brevard County, FL.
Adams described M. modesta as "reddish black...with, on the upper whorls, two, and in the middle and lower whorls three spiral ridges, which are of equal size on the lower two-thirds of the shell." "...whorls about fourteen..." Rolan adds in his 1995 paper, "Protoconch...with about 4 whorls, nucleus with minute hemispheric granules, subsequent whorls with two spiral ridges crossed by numerous axial riblets." Redfern further describes it as "To 5mm, sinistral, with a protoconch of 4.5 whorls..." "The adult shell tends to be relatively narrow and straight-sided, with the sutures well defined." He notes "A thin spiral thread is sometimes quite prominent at the suture." As I've observed, Redfern also notes that the beads are most often paler, especially against the darker background band of the suture and first subsutural cord.
Redfern comments that "This (M. modesta) is probably the species that has often been referred to as Triphora nigrocincta (C. B. Adams, 1839)." Most workers now treat the shell found in Florida that was previously identified as M. nigrocincta (C. B. Adams, 1839)( type locality - Dartmouth Harbor, Massachusetts) as M. modesta. From the various descriptions I've read, despite the general acceptance that M. nigrocincta is valid, I remain doubtful and suspect that when the DNA dust settles, only one of these names will apply. I am seeking specimens collected from Adam's type location and in the back of my mind hope to collect there myself in the next year.
CLICK HERE for a comparison of Marshallora modesta vs Marshallora nichupte