Lindsey Groves | Natural History Museum Los Angeles County (original) (raw)

Papers by Lindsey Groves

Research paper thumbnail of Pleistocene to Holocene continuity and discontinuity in California Northern Channel Island marine invertebrate communities

Quaternary science advances, Feb 1, 2024

There is growing interest in analyzing interdisciplinary datasets to better understand the evolut... more There is growing interest in analyzing interdisciplinary datasets to better understand the evolution of ecosystems through deep time. One burgeoning area has been the integration of archaeological and fossil data to evaluate the long-term structure and function of habitats, floral and faunal communities, and ecosystems. Here, marine invertebrate data from Holocene archaeological sites and Pleistocene marine terrace deposits on California's Northern Channel Islands are combined to glean insights into the long-term structure of nearshore marine ecosystems, the composition of intertidal marine invertebrate communities, and the formation of archaeological shell middens. While a variety of methodological, analytical, and taphonomic challenges in comparing disparate datasets from fossil and archaeological contexts were identified, we offer perspectives for surmounting these challenges in future research. These findings indicate that the integration of fossil and archaeological data, spanning tens of thousands of years, offers important insights on the evolution of nearshore coastal ecosystems and marine climate change in California and around the world.

Research paper thumbnail of The Marine Terraces of Santa Cruz Island, California: Implications for Glacial Isostatic Adjustment Models of Last-Interglacial Sea-Level History

GSA 2020 Connects Online, 2020

Abstract Glacial isostatic adjustment (GIA) models hypothesize that along coastal California, las... more Abstract Glacial isostatic adjustment (GIA) models hypothesize that along coastal California, last interglacial (LIG, broadly from ~130 to ~115 ka) sea level could have been as high as +11 m to +13 m, relative to present, substantially higher than the commonly estimated elevation of +6 m. Areas with low uplift rates can test whether such models are valid. Marine terraces on Santa Cruz Island have previously been reported to occur at low (

Research paper thumbnail of The Marine Terraces of Santa Cruz Island, California: Implications for Glacial Isostatic Adjustment Models of Last-Interglacial Sea-Level History

GSA 2020 Connects Online, 2020

Abstract Glacial isostatic adjustment (GIA) models hypothesize that along coastal California, las... more Abstract Glacial isostatic adjustment (GIA) models hypothesize that along coastal California, last interglacial (LIG, broadly from ~130 to ~115 ka) sea level could have been as high as +11 m to +13 m, relative to present, substantially higher than the commonly estimated elevation of +6 m. Areas with low uplift rates can test whether such models are valid. Marine terraces on Santa Cruz Island have previously been reported to occur at low (

Research paper thumbnail of A Comparison of Short-Term and Longer-Term Quaternary Tectonic Uplift Rates from Marine Terraces, Palos Verdes Hills, Los Angeles County, California

Geological Society of America Abstracts with Programs

Research paper thumbnail of FIGURE 1 in Annotated Catalog of the Fossil Invertebrates Described by, and Named for, William More Gabb (1839-1878)

FIGURE 1. William More Gabb in field gear (circa 1869). [Image courtesy of the University of Cali... more FIGURE 1. William More Gabb in field gear (circa 1869). [Image courtesy of the University of California, Museum of Paleontology]

Research paper thumbnail of FIGURE 2 in Annotated Catalog of the Fossil Invertebrates Described by, and Named for, William More Gabb (1839-1878)

FIGURE 2. Members of the California Geological Survey in December 1863 (left to right): Chester A... more FIGURE 2. Members of the California Geological Survey in December 1863 (left to right): Chester Averill (Assistant); William M. Gabb (Paleontologist); William Ashburner (Field Assistant); Josiah D. Whitney (State Geologist); Charles F. Hoffman (Topographer); Clarence King (Geologist); and William Brewer (Botanist). [Image courtesy of the University of California, Berkeley, Bancroft Library]

Research paper thumbnail of Fossil and Recent species of eastern Pacific Cypraeacea (Cypraeidae and Eocypraeinae ): an update

Research paper thumbnail of A complex record of last interglacial sea-level history and paleozoogeography, Santa Rosa Island, Channel Islands National Park, California, USA

Palaeogeography, Palaeoclimatology, Palaeoecology

Research paper thumbnail of Paleontology and biostratigraphy of the Plio -Pleistocene lower Saugus Formation, Santa Susana Mountains, southern California

Research paper thumbnail of A new early Miocene Muracypraea woodring, 1957 (Gastropoda: Cypraeidae) from the Pisco Basin of southern Peru

Research paper thumbnail of Bivalvia Linnaeus 1758

BIVALVIA Subgenera and Genera<i> Anthonya</i> Gabb, 1864b: 181–182.<b> Type Spe... more BIVALVIA Subgenera and Genera<i> Anthonya</i> Gabb, 1864b: 181–182.<b> Type Species:</b><i> Anthonya cultriformis</i> Gabb, 1864b: 182, pl. 30, figs. 236–236a, by monotypy.<i> Bothrocorbula</i> Gabb, 1872c: 274; 1872d: 247.<b> Type Species:</b><i> Corbula viminea</i> Guppy, 1866: 293, pl. 18, fig. 11, by monotypy.<b> Remarks:</b> Considered a subgenus of<i> Corbula</i> by Anderson (1996: 12).<i> Clisocolus</i> Gabb, 1869b: 188–189.<b> Type Species:</b>?<i> Loripes dubia</i> Gabb, 1864b: 177, pl. 24, figs. 170–171, by OD.<i> Conchocele</i> Gabb, 1866: 27–28.<b> Type Species:</b><i> Conchocele disjuncta</i> Gabb, 1866: 28, pl. 7, figs. 48–48b, by monotypy.<b> Remarks:</b> See generic revision by Oliver & Frey (2014: 465–466).<i> Cymbophora</i> Gabb, 1869b: 180–181.<b> Type Species:</b&gt...

Research paper thumbnail of Gastropoda

GASTROPODA SUBGENERA AND HIGHER TAXA<i> Actaeonidea</i> Gabb, 1872c: 273; 1872d: 245.... more GASTROPODA SUBGENERA AND HIGHER TAXA<i> Actaeonidea</i> Gabb, 1872c: 273; 1872d: 245.<b> Type Species:</b><i> Actaeonidea oryza</i> Gabb, 1872c: 273, pl. 11, figs. 8, 8a, by monotypy.<i> Agasoma</i> Gabb, 1869 a: 46.<b> Type Species:</b><i> Clavella sinuata</i> Gabb, 1866: 4, pl. 1, fig. 7, by SD of Cossmann (1901: 198). See Stewart (1927: 399) for a discussion of the nomenclatural history of the type species selection of this genus.<i> Arrhoges</i> Gabb, 1868: 145.<b> Type Species:</b><i> Rostellaria occidentalis</i> Beck 1836: 156, by OD.<b> Remarks:</b> Described as a subgenus of<i> Aporrhais</i> da Costa, 1778.<i> Ataphrus</i> Gabb, 1869b: 171.<b> Type Species:</b><i> Ataphrus crassus</i> Gabb, 1869b: 171, pl. 28, fig. 54, by monotypy.<b> Remarks:</b> Considered a<i> nomen dubium</i> by Kai...

Research paper thumbnail of Cephalopoda

CEPHALOPODA GENERA AND HIGHER TAXA<i> Diptychoceras</i> Gabb, 1869b: 143.<b> Ty... more CEPHALOPODA GENERA AND HIGHER TAXA<i> Diptychoceras</i> Gabb, 1869b: 143.<b> Type species:</b><i> Diptychoceras laevis</i> Gabb, 1869b: 144–145, pl. 25, figs. 21–21b, by OD.<i> Helicancylus</i> Gabb, 1869b: 140–141.<b> Type species:</b><i> Ptychoceras aequicostatus</i> Gabb, 1864b: 74, pl. 25, fig. 20, by monotypy.<b> Remarks:</b><i> Helicancylcus</i> is a<i> nomen dubium</i>, according to Vermeulen<i> et al.</i> (2013: 30). Polorthidae Gabb, 1872a: 260–261.<b> Remarks:</b> Gabb (1872a) erected this family based on examination of the bivalve<i> Polorthus americana</i> (Gabb), believing it to be a cephalopod and designated<i> Polorthus</i> as the type genus of the new family. Stephenson (1937: 60) demonstrated that<i> P. americana</i> is a boring bivalve.<i> Ptiloteuthis</i> Gabb, 1869b: 128.<b> Type ...

Research paper thumbnail of <p class="HeadingRunIn"><strong>Foreword</strong></p>

Zoosymposia, 2019

The present volume has a history spanning approximately 60 years. It began with James (Jim) Hamil... more The present volume has a history spanning approximately 60 years. It began with James (Jim) Hamilton McLean’s dissertation, commenced in the early 1960’s and completed in 1966. Right from the beginning, Jim wanted to revise the entire gastropod fauna of the northeast Pacific. This initial dissertation proposal was tempered in scope by the experience of his advisor, none other than A. Myra Keen at Stanford University. The finished dissertation on the patelliform archaeogastropods and the abalone and scissurellids was the first component and catalyst for his life-long endeavor to complete a comprehensive faunal treatment that would be colloquially known as The Book.

Research paper thumbnail of LACM Malacology

LACM Malacology The James H. McLean Mollusk Collection of the LACM Malacology Department is one o... more LACM Malacology The James H. McLean Mollusk Collection of the LACM Malacology Department is one of the largest recent mollusk collections in North America and the world … and is the largest of its kind on the Pacific Rim. The collection is predominantly dry material with lesser amounts of wet preserved specimens and includes material from all molluscan classes. It is worldwide in scope with an emphasis on the eastern Pacific Ocean (arctic Alaska to southern Chile) and includes an estimated 500,000 lots containing approximately 4.5 million specimens. Over 120,000 lots have been electronically captured, which includes over 2,300 type lots. Renowned acquired collections include those from the University of California, Los Angeles (UCLA) and the Alan Hancock Foundation at the University of Southern California (USC).

Research paper thumbnail of Earliest record of the genus Haliotis (Mollusca : Gastropoda) from the Late Cretaceous (Campanian) of Los Angeles County, California

Veliger, 2008

Cretaceous abalone are extremely rare and are known from only two valid species: Haliotis lomaens... more Cretaceous abalone are extremely rare and are known from only two valid species: Haliotis lomaensis Anderson, 1902, from the Late Cretaceous (latest Campanian/earliest Maastrichtian) of San Diego County, California and H. antillesensis Sohl, 1992, from the Late Cretaceous (late Maastrichtian) of southwestern Puerto Rico. The earliest record of the genus Haliotis is here documented from Late Cretaceous (middle middle to late middle Campanian) strata of the Tuna Canyon Formation, Garapito Creek area of Topanga Canyon, Santa Monica Mountains, Los Angeles County, California. This additional Cretaceous record for Haliotis could possibly indicate a North American origin for the family Haliotidae.

Research paper thumbnail of A 50,000-YEAR-LONG Arctic Paleoclimate Record from a Loess-Paleosol Sequence, Kotzebue, Alaska, Usa

Geological Society of America Abstracts with Programs, 2020

Research paper thumbnail of A Review of Cypraeiform Gastropods from Neogene Strata of Northwestern Ecuador, with the Description of Two New Species

Tulane Studies in Geology and Paleontology, 2017

Six cypraeacean species, two of them new, and one unidentified triviid specimen are reviewed from... more Six cypraeacean species, two of them new, and one unidentified triviid specimen are reviewed from Neogene strata of northwestern Ecuador. New species of Zonaria s.s. and Z. (Pseudozonaria) are described from the lower Pliocene Esmeraldas beds of the Onzole Formation. These new species and Jenneria (Jenneria) panamensis (Olsson, 1967) are the first cypraeaceans reported from the Esmeraldas beds. The unidentified triviid is the first of its kind reported from the Neogene of Ecuador. Three previously described cypraeid species are also included in this review.

Research paper thumbnail of Active Faults of the northern Los Angeles Basin Field Excursion

Research paper thumbnail of New species of Late Cretaceous Cypraeidae (Gastropoda) from California and British Columbia and new records from the Pacific slope

The Nautilus, 2004

Cretaceous cypraeids are uncommon in North American strata and comprise 15 recognized species, se... more Cretaceous cypraeids are uncommon in North American strata and comprise 15 recognized species, seven of which are from the Pacific slope of North America (Groves, 1990). Four new species are described herein from localities in southern and northern California and British Columbia, Canada: Palaeocypraea (Palaeocypraea) wilfredi new species and Bemaya (Bernaya) jeanae new species, both from the Upper Cretaceous (lower Campanian) Chico Formation, Butte County, California; Bemaya (Bemaya) beardi new species from the Upper Cretaceous (uppermost Santonian to lowermost Campanian) upper Haslam Formation, Vancouver Island, British Columbia, Canada; and Bemaya (Protocypraea) popenoei new species from the Upper Cretaceous (lower Campanian) Ladd Formation, Orange County, California. The late Campanian to early Maastrichtian was the Mesozoic peak of cypraeids, in terms of numbers of species and geographic distribution both in North America and worldwide (Groves, 1994). New paleogeographic and ch...

Research paper thumbnail of Pleistocene to Holocene continuity and discontinuity in California Northern Channel Island marine invertebrate communities

Quaternary science advances, Feb 1, 2024

There is growing interest in analyzing interdisciplinary datasets to better understand the evolut... more There is growing interest in analyzing interdisciplinary datasets to better understand the evolution of ecosystems through deep time. One burgeoning area has been the integration of archaeological and fossil data to evaluate the long-term structure and function of habitats, floral and faunal communities, and ecosystems. Here, marine invertebrate data from Holocene archaeological sites and Pleistocene marine terrace deposits on California's Northern Channel Islands are combined to glean insights into the long-term structure of nearshore marine ecosystems, the composition of intertidal marine invertebrate communities, and the formation of archaeological shell middens. While a variety of methodological, analytical, and taphonomic challenges in comparing disparate datasets from fossil and archaeological contexts were identified, we offer perspectives for surmounting these challenges in future research. These findings indicate that the integration of fossil and archaeological data, spanning tens of thousands of years, offers important insights on the evolution of nearshore coastal ecosystems and marine climate change in California and around the world.

Research paper thumbnail of The Marine Terraces of Santa Cruz Island, California: Implications for Glacial Isostatic Adjustment Models of Last-Interglacial Sea-Level History

GSA 2020 Connects Online, 2020

Abstract Glacial isostatic adjustment (GIA) models hypothesize that along coastal California, las... more Abstract Glacial isostatic adjustment (GIA) models hypothesize that along coastal California, last interglacial (LIG, broadly from ~130 to ~115 ka) sea level could have been as high as +11 m to +13 m, relative to present, substantially higher than the commonly estimated elevation of +6 m. Areas with low uplift rates can test whether such models are valid. Marine terraces on Santa Cruz Island have previously been reported to occur at low (

Research paper thumbnail of The Marine Terraces of Santa Cruz Island, California: Implications for Glacial Isostatic Adjustment Models of Last-Interglacial Sea-Level History

GSA 2020 Connects Online, 2020

Abstract Glacial isostatic adjustment (GIA) models hypothesize that along coastal California, las... more Abstract Glacial isostatic adjustment (GIA) models hypothesize that along coastal California, last interglacial (LIG, broadly from ~130 to ~115 ka) sea level could have been as high as +11 m to +13 m, relative to present, substantially higher than the commonly estimated elevation of +6 m. Areas with low uplift rates can test whether such models are valid. Marine terraces on Santa Cruz Island have previously been reported to occur at low (

Research paper thumbnail of A Comparison of Short-Term and Longer-Term Quaternary Tectonic Uplift Rates from Marine Terraces, Palos Verdes Hills, Los Angeles County, California

Geological Society of America Abstracts with Programs

Research paper thumbnail of FIGURE 1 in Annotated Catalog of the Fossil Invertebrates Described by, and Named for, William More Gabb (1839-1878)

FIGURE 1. William More Gabb in field gear (circa 1869). [Image courtesy of the University of Cali... more FIGURE 1. William More Gabb in field gear (circa 1869). [Image courtesy of the University of California, Museum of Paleontology]

Research paper thumbnail of FIGURE 2 in Annotated Catalog of the Fossil Invertebrates Described by, and Named for, William More Gabb (1839-1878)

FIGURE 2. Members of the California Geological Survey in December 1863 (left to right): Chester A... more FIGURE 2. Members of the California Geological Survey in December 1863 (left to right): Chester Averill (Assistant); William M. Gabb (Paleontologist); William Ashburner (Field Assistant); Josiah D. Whitney (State Geologist); Charles F. Hoffman (Topographer); Clarence King (Geologist); and William Brewer (Botanist). [Image courtesy of the University of California, Berkeley, Bancroft Library]

Research paper thumbnail of Fossil and Recent species of eastern Pacific Cypraeacea (Cypraeidae and Eocypraeinae ): an update

Research paper thumbnail of A complex record of last interglacial sea-level history and paleozoogeography, Santa Rosa Island, Channel Islands National Park, California, USA

Palaeogeography, Palaeoclimatology, Palaeoecology

Research paper thumbnail of Paleontology and biostratigraphy of the Plio -Pleistocene lower Saugus Formation, Santa Susana Mountains, southern California

Research paper thumbnail of A new early Miocene Muracypraea woodring, 1957 (Gastropoda: Cypraeidae) from the Pisco Basin of southern Peru

Research paper thumbnail of Bivalvia Linnaeus 1758

BIVALVIA Subgenera and Genera<i> Anthonya</i> Gabb, 1864b: 181–182.<b> Type Spe... more BIVALVIA Subgenera and Genera<i> Anthonya</i> Gabb, 1864b: 181–182.<b> Type Species:</b><i> Anthonya cultriformis</i> Gabb, 1864b: 182, pl. 30, figs. 236–236a, by monotypy.<i> Bothrocorbula</i> Gabb, 1872c: 274; 1872d: 247.<b> Type Species:</b><i> Corbula viminea</i> Guppy, 1866: 293, pl. 18, fig. 11, by monotypy.<b> Remarks:</b> Considered a subgenus of<i> Corbula</i> by Anderson (1996: 12).<i> Clisocolus</i> Gabb, 1869b: 188–189.<b> Type Species:</b>?<i> Loripes dubia</i> Gabb, 1864b: 177, pl. 24, figs. 170–171, by OD.<i> Conchocele</i> Gabb, 1866: 27–28.<b> Type Species:</b><i> Conchocele disjuncta</i> Gabb, 1866: 28, pl. 7, figs. 48–48b, by monotypy.<b> Remarks:</b> See generic revision by Oliver & Frey (2014: 465–466).<i> Cymbophora</i> Gabb, 1869b: 180–181.<b> Type Species:</b&gt...

Research paper thumbnail of Gastropoda

GASTROPODA SUBGENERA AND HIGHER TAXA<i> Actaeonidea</i> Gabb, 1872c: 273; 1872d: 245.... more GASTROPODA SUBGENERA AND HIGHER TAXA<i> Actaeonidea</i> Gabb, 1872c: 273; 1872d: 245.<b> Type Species:</b><i> Actaeonidea oryza</i> Gabb, 1872c: 273, pl. 11, figs. 8, 8a, by monotypy.<i> Agasoma</i> Gabb, 1869 a: 46.<b> Type Species:</b><i> Clavella sinuata</i> Gabb, 1866: 4, pl. 1, fig. 7, by SD of Cossmann (1901: 198). See Stewart (1927: 399) for a discussion of the nomenclatural history of the type species selection of this genus.<i> Arrhoges</i> Gabb, 1868: 145.<b> Type Species:</b><i> Rostellaria occidentalis</i> Beck 1836: 156, by OD.<b> Remarks:</b> Described as a subgenus of<i> Aporrhais</i> da Costa, 1778.<i> Ataphrus</i> Gabb, 1869b: 171.<b> Type Species:</b><i> Ataphrus crassus</i> Gabb, 1869b: 171, pl. 28, fig. 54, by monotypy.<b> Remarks:</b> Considered a<i> nomen dubium</i> by Kai...

Research paper thumbnail of Cephalopoda

CEPHALOPODA GENERA AND HIGHER TAXA<i> Diptychoceras</i> Gabb, 1869b: 143.<b> Ty... more CEPHALOPODA GENERA AND HIGHER TAXA<i> Diptychoceras</i> Gabb, 1869b: 143.<b> Type species:</b><i> Diptychoceras laevis</i> Gabb, 1869b: 144–145, pl. 25, figs. 21–21b, by OD.<i> Helicancylus</i> Gabb, 1869b: 140–141.<b> Type species:</b><i> Ptychoceras aequicostatus</i> Gabb, 1864b: 74, pl. 25, fig. 20, by monotypy.<b> Remarks:</b><i> Helicancylcus</i> is a<i> nomen dubium</i>, according to Vermeulen<i> et al.</i> (2013: 30). Polorthidae Gabb, 1872a: 260–261.<b> Remarks:</b> Gabb (1872a) erected this family based on examination of the bivalve<i> Polorthus americana</i> (Gabb), believing it to be a cephalopod and designated<i> Polorthus</i> as the type genus of the new family. Stephenson (1937: 60) demonstrated that<i> P. americana</i> is a boring bivalve.<i> Ptiloteuthis</i> Gabb, 1869b: 128.<b> Type ...

Research paper thumbnail of <p class="HeadingRunIn"><strong>Foreword</strong></p>

Zoosymposia, 2019

The present volume has a history spanning approximately 60 years. It began with James (Jim) Hamil... more The present volume has a history spanning approximately 60 years. It began with James (Jim) Hamilton McLean’s dissertation, commenced in the early 1960’s and completed in 1966. Right from the beginning, Jim wanted to revise the entire gastropod fauna of the northeast Pacific. This initial dissertation proposal was tempered in scope by the experience of his advisor, none other than A. Myra Keen at Stanford University. The finished dissertation on the patelliform archaeogastropods and the abalone and scissurellids was the first component and catalyst for his life-long endeavor to complete a comprehensive faunal treatment that would be colloquially known as The Book.

Research paper thumbnail of LACM Malacology

LACM Malacology The James H. McLean Mollusk Collection of the LACM Malacology Department is one o... more LACM Malacology The James H. McLean Mollusk Collection of the LACM Malacology Department is one of the largest recent mollusk collections in North America and the world … and is the largest of its kind on the Pacific Rim. The collection is predominantly dry material with lesser amounts of wet preserved specimens and includes material from all molluscan classes. It is worldwide in scope with an emphasis on the eastern Pacific Ocean (arctic Alaska to southern Chile) and includes an estimated 500,000 lots containing approximately 4.5 million specimens. Over 120,000 lots have been electronically captured, which includes over 2,300 type lots. Renowned acquired collections include those from the University of California, Los Angeles (UCLA) and the Alan Hancock Foundation at the University of Southern California (USC).

Research paper thumbnail of Earliest record of the genus Haliotis (Mollusca : Gastropoda) from the Late Cretaceous (Campanian) of Los Angeles County, California

Veliger, 2008

Cretaceous abalone are extremely rare and are known from only two valid species: Haliotis lomaens... more Cretaceous abalone are extremely rare and are known from only two valid species: Haliotis lomaensis Anderson, 1902, from the Late Cretaceous (latest Campanian/earliest Maastrichtian) of San Diego County, California and H. antillesensis Sohl, 1992, from the Late Cretaceous (late Maastrichtian) of southwestern Puerto Rico. The earliest record of the genus Haliotis is here documented from Late Cretaceous (middle middle to late middle Campanian) strata of the Tuna Canyon Formation, Garapito Creek area of Topanga Canyon, Santa Monica Mountains, Los Angeles County, California. This additional Cretaceous record for Haliotis could possibly indicate a North American origin for the family Haliotidae.

Research paper thumbnail of A 50,000-YEAR-LONG Arctic Paleoclimate Record from a Loess-Paleosol Sequence, Kotzebue, Alaska, Usa

Geological Society of America Abstracts with Programs, 2020

Research paper thumbnail of A Review of Cypraeiform Gastropods from Neogene Strata of Northwestern Ecuador, with the Description of Two New Species

Tulane Studies in Geology and Paleontology, 2017

Six cypraeacean species, two of them new, and one unidentified triviid specimen are reviewed from... more Six cypraeacean species, two of them new, and one unidentified triviid specimen are reviewed from Neogene strata of northwestern Ecuador. New species of Zonaria s.s. and Z. (Pseudozonaria) are described from the lower Pliocene Esmeraldas beds of the Onzole Formation. These new species and Jenneria (Jenneria) panamensis (Olsson, 1967) are the first cypraeaceans reported from the Esmeraldas beds. The unidentified triviid is the first of its kind reported from the Neogene of Ecuador. Three previously described cypraeid species are also included in this review.

Research paper thumbnail of Active Faults of the northern Los Angeles Basin Field Excursion

Research paper thumbnail of New species of Late Cretaceous Cypraeidae (Gastropoda) from California and British Columbia and new records from the Pacific slope

The Nautilus, 2004

Cretaceous cypraeids are uncommon in North American strata and comprise 15 recognized species, se... more Cretaceous cypraeids are uncommon in North American strata and comprise 15 recognized species, seven of which are from the Pacific slope of North America (Groves, 1990). Four new species are described herein from localities in southern and northern California and British Columbia, Canada: Palaeocypraea (Palaeocypraea) wilfredi new species and Bemaya (Bernaya) jeanae new species, both from the Upper Cretaceous (lower Campanian) Chico Formation, Butte County, California; Bemaya (Bemaya) beardi new species from the Upper Cretaceous (uppermost Santonian to lowermost Campanian) upper Haslam Formation, Vancouver Island, British Columbia, Canada; and Bemaya (Protocypraea) popenoei new species from the Upper Cretaceous (lower Campanian) Ladd Formation, Orange County, California. The late Campanian to early Maastrichtian was the Mesozoic peak of cypraeids, in terms of numbers of species and geographic distribution both in North America and worldwide (Groves, 1994). New paleogeographic and ch...