Costaclis egregia is a species of sea snail, a marine gastropod mollusc in the family Eulimidae.Dall, 1889. Warén A. (2011). Checklist of Eulimidae. pers. com. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=532666 on 2013-01-06.
Description The maximum recorded shell length is 13 mm.Welch J. J. (2010). "The “Island Rule” and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. doi:10.1371/journal.pone.0008776.
Habitat Minimum recorded depth is 250 m. Maximum recorded depth is 1436 m.
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