We have four juvenile specimens of Crassilabrum crassilabrum (ANSP 251730),
two of which have somewhat worn protoconchs that were probably less than two
whorls when intact. So most likely this species has direct development. (For
those of you not familiar with the terminology, direct development means
that the eggs hatch directly to a crawling juvenile, so there is no
planktonic larval stage.)
Gary
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Gary Rosenberg, Ph.D. [log in to unmask]
Malacology & Invertebrate Paleontology gopher://erato.acnatsci.org
Academy of Natural Sciences http://www.acnatsci.org
1900 Benjamin Franklin Parkway Phone 215-299-1033
Philadelphia, PA 19103-1195 USA Fax 215-299-1170