THE NAUTILUS 1 1()(4):122-13S, 199']
A New Gastropod Fauna From An Oligocene Back-Reef
Laeoonal En\dronnient In West Central Florida
o
Edward J. Petuch
DfjKutineiit of Gt'olos^'
Florida Atlantic Uiii\f'rsitv
Bota Raton, Florida 33431
utkI
Departnjent ol Pakontoloin,-
Graves Miisfinn ol Arcliacoloi^x ,uul
Natural History
481 SoutI] Federal Ili<ili\\a\'
Dania, Florida 33004
ABSTRACT
T\vent\-one new species of i^astropods and three new gastro-
pod genera are described from a ncwK -recognized back-reef
lagoonal facies of the Oligocene Snwannee Formation. The
new species, which were collected in a lirnt'stone quarry in
westernmost Polk Count\', Florida, inclnde: Astraca (Astral-
iiiin) polkcn.sis n. sp. (Turbinitlae), Piimzi.sinus kentlmvi n. sp.
(Potaniididae). Prisiiuircritliiiiiii prisma n. sp. (Cerithiidae),
Paclii/troinminm iliilli n. .sp. and Paclujcrommium inansfiehli n.
sp. (i)otli .Naticidae), Ct/i)nir()rl>is ki'iuhvici n. sp. (Cvpraeidae).
Spiniftilf^^iir i^c'inmulatiiin n. sp. (Bus\conidae), Soh'no.steira sit-
iciiiiiifcnsis n. sp. (Buccinidae), Vasuin siiwaiincensi.s n. sp.
(Turl)inellidae), Ftilsih/ria kciidrcui n. sp. (\'olutidae), Con-
oiiiitra ki-iiilnwi n. sp. (N'olntomitridac), D<'nliiiuir<j,ti dalli n.
sp., Persiculri (hickin/i n. sp., Per.siculii nuieneili n. sp., Persi-
cula suuditni-cnsis. n, sji,, PniiiiiDi friaic n. sp., Pniimiii je.s-
sicac n. sp., Pniniiiii sdiuhyu-n. sp. (all Margin<-llidac). Coiiits
lAsprcllin kcndrciLt n. sp. (Gonidac). Plciii'dfiisid (hiwliitfl,! n.
sp. ('Inrridael, and Siiaaiiiirsriiplui liiiiliu-n, sp. (Cylichnidae).
The new genera, whicli ajipear to be irslrirled to Oligocene
coralline enxironnicnts, include: ('I'stiiiiici rilliiiiiii n. ij;cii, and
Prisiiiacciifhiniii n. gen. (( !crilliiidae) and Siiiiaiiiu'siaplia n.
gen. ((A'liehnidac). In tolal, seventv-two species of gastropods
were collected from h)iir diiierent back-reel lagoonal biotopes,
including biolicruis ol the branching coral Sti/ltiplmm iiiiiiutis-
siiiui, open-bottoni sand areas, sea grass beds, and inlertidal
mud flats with o\ster bars.
Kci/ Udifls: Oligocene, I'lorida. Suwarniee Fornialion, tA)ral
Biohenn. (Gastropoda.
INTRODUCTION
The early Oligocene (Latdorfian) gaslri)|)<)il lanna ol'tlic
lower Mississippi Ri\cr X'aJlev and soutlieastern United
States has long i)eeii known to he one-ol the nio.st spe-
eies-rieh in the Eastern North American (leno/oie. This
tropieal-snhtropieal laniia is ol particular interest to exo-
hitionan paleontologists and hiogeographers in that it
ehi
N(
contains the liist-knowii t'.xaniples ol main (.
BioStor
