Posted: Nov 23 2010

 Busycon sinistrum Hollister, 1958, Lightening Whelk

3/20/18:  The generic name has apparently changed, but dispute still remains as to the status of the species/subspecies naming.  Here's what WoRMS has to say as of this date:

 

Older name (accepted):  Sinistrofulgur perversum (Linnaeus, 1758). 

Newer name (accepted):  Sinistrofulgur sinistrum (Hollister, 1958)

Elsewhere, Sinistrofulgur sinistrum is also presented as a subspecies as Busycon perversum sinistrum Hollister, 1958.

So, take your pick.  I haven't read it, but see the below which supports they are all one:

bs1
bs1
bs2
bs2
bs3
bs3
bs4
bs4
bs5
bs5
bs6
bs6
bs7
bs7
bs8
bs8
bs9
bs9
sinistrummarco-1
sinistrummarco-1
BusyconsinistrumMarcoIsl
BusyconsinistrumMarcoIsl
whelks
whelks
B_ sinistrum right-handed
B_ sinistrum right-handed
ftpierce
ftpierce
ftpierce2
ftpierce2
Revof
Revof
bsinjuvenile
bsinjuvenile
BusyconsinistrumHannaPark1
BusyconsinistrumHannaPark1
BusyconsinistrumHannaPark2
BusyconsinistrumHannaPark2

For more photos see jaxshells