THE NAUTILUS 120(2):66-78, 2006
Page 66
New buccinoid gastropods from uppermost Cretaceous and
Paleocene strata of California and Baja California, Mexico
Richard L. Squires
Department of Geological Sciences
California State University,
Northridge, CA 91330-8266 USA
[email protected]
LouEIla R. Saul
Invertebrate Paleontology Section
Natural History Museum of Los Angeles
County
900 Exposition Boulevard
Los Angeles, CA 90007 USA
[email protected]
ABSTRACT
Two new genera and three new species of extinct buccinoid
gastropods are described and named from the Pacific slope of
North America. The buccinid? Ornopsis? dysis new species is
from uppermost Maastrichtian (uppermost Cretaceous) strata
in the Dip Creek area, San Luis Obispo County, west-central
California. The fasciolarine fasciolarid? Saxituberosa new genus
is comprised of the lineage Saxituberosa funs new species, from
lower Paleocene (Danian) strata in Los Angeles County, south-
ern California, and Saxituberosa titan (Waring, 1917), from
middle Paleocene (Selandian) strata in Ventura and Los Ange-
les counties, southern California, and northern Baja California,
Mexico. The fusinine fasciolarid? Pcrrilliata califia new genus
and new species is known from middle Paleocene (Selandian)
strata in Ventura Count)', southern California and northern
Baja California, Mexico. Ornopsis? dysis and Pcrrilliata califia
are similar in morphology and geologic age to Gulf Coast Or-
nopsis (Ornopsis) "Icwii Wade 1916, and Fasciolaria? plum-
meri Gardner, 1 933, respectively; whereas probable congeners
for Saxituberosa are unknown, and it appears to be endemic to
the northeastern Pacific.
INTRODUCTION
Four species, three of which are new, are described in
this report. They are of similar aspect in having fusiform
shells with tabulate whorls ornamented by knobs and
spiral ribs. They are recognized as being of three differ-
ent genera, two oi which are new.
Saul (19S6a). in Iier exploratory work on shallow-
marine mollusks from the Lake Nacimiento area, San
Luis Obispo County, west-central California, illustrated a
specimen of Ornopsis? n. sp. from the uppermost Cre-
taceous part of the El Piojo Formation along the east side
of Dip Creek (Figure 1). Saul I L986a), furthermore, re-
ported that Ornopsis? n. sp. is apparently the "Trachytri-
ton" titan Waring, 1917, that was included in the Dip
Creek macrofaunal list provided by Taliaferro (1944).
Tin's present work was initiated in order to provide a
better understanding of the relationship between Ornop-
is? ii, sp. and "T." Ulan. Saul's Ornop,
VP
Specimen codes extracted from OCR text.
BioStor
