Recent molluscan types currently housed in the Malacology Section of the Natural History Museum o... more Recent molluscan types currently housed in the Malacology Section of the Natural History Museum of Los Angeles County are listed herein. Each type lot entry includes original species/subspecies name, original genus, author, original citation, type status, LACM number, number of specimens and preservation, type locality or collection locality, collector [if known], date collected [if known], and current taxonomic status if different from original description. INTRODUCTION This catalog is published in accordance with Recommendation 72F.4 of the International Code of Zoological Nomenclature (Ride & others, 2000:79). This listing includes all molluscan type material currently housed at the Natural History Museum of Los Angeles County and supercedes the type listing of Sphon (1971). To date 1922 molluscan type lots (71,000+ specimens) are reported for 1147 species and 99 subspecies, which includes 589 holotypes, 1277 paratype lots, 10 lectotypes, 13 paralectotype lots, 29 syntype lots, 3...
Compared to their Recent counterparts, fossil abalone are rare and poorly known. Their taxonomy i... more Compared to their Recent counterparts, fossil abalone are rare and poorly known. Their taxonomy is problematic, because most of the 35 fossil species have been described from single specimens and shell characteristics of Recent species are extremely plastic. Thus, the use of fossil species in phylogeny is questionable. Abalone first appear in the Upper Cretaceous (Maastrichian) with one species each in California and the Caribbean, are unknown in the Paleocene, and appear again in the late Eocene and Oligocene of New Zealand and Europe. They are regularly found from the late Miocene to the Recent in tropical to temperate regions worldwide. Most records are from intensely studied areas: SW North America, Caribbean, Europe, South Africa, Japan, and Australia. Despite their highest present-day diversity being found in the Indo-Pacific, their scarcity in the fossil record in this region is remarkable. The family may have originated in the central Indo-Pacific, Pacific Rim, or Tethys. An extensive list of all known fossil records including new ones from Europe and western North America is given. Fossil and Recent abalone both apparently lived in the shallow, rocky sublittoral in tropical and temperate climates. No on-shore/off-shore pattern is detected.
Neobernaya spadicea (Swainson, 1823) is the only representative of the family Cypraeidae in the n... more Neobernaya spadicea (Swainson, 1823) is the only representative of the family Cypraeidae in the northeast Pacific Ocean. It ranges from Monterey Bay, Monterey County, California, to southern Baja California Sur. This remarkable species is unmistakable and is unlikely to be confused with any other cypraeid.
Fossils of Columbian mammoths (Mammuthus columbi) and pygmy mammoths (Mammuthus exilis) have been... more Fossils of Columbian mammoths (Mammuthus columbi) and pygmy mammoths (Mammuthus exilis) have been reported from Channel Islands National Park, California. Most date to the last glacial period (Marine Isotope Stage [MIS] 2), but a tusk of M. exilis (or immature M. columbi) was found in the lowest marine terrace of Santa Rosa Island. Uranium-series dating of corals yielded ages from 83.8 ± 0.6 ka to 78.6 ± 0.5 ka, correlating the terrace with MIS 5.1, a time of relatively high sea level. Mammoths likely immigrated to the islands by swimming during the glacial periods MIS 6 (~ 150 ka) or MIS 8 (~ 250 ka), when sea level was low and the island–mainland distance was minimal, as during MIS 2. Earliest mammoth immigration to the islands likely occurred late enough in the Quaternary that uplift of the islands and the mainland decreased the swimming distance to a range that could be accomplished by mammoths. Results challenge the hypothesis that climate change, vegetation change, and decreas...
New high-precision thermal ionization mass-spectrometric (TIMS) U-series ages of solitary corals ... more New high-precision thermal ionization mass-spectrometric (TIMS) U-series ages of solitary corals (Balanophyllia elegans) from several marine terrace localities along the California and southern Oregon coasts date to the ˜80,000 yr BP high stand of sea, correlative with marine isotope substage 5a, late in the last interglacial complex. Ages of multiple corals from localities north of Point Año Nuevo (central California) and San Nicolas Island (southern California) suggest that this high sea stand could have lasted at least 8000 yr, from ˜84,000 to ˜76,000 yr BP. These ages overlap with those from marine deposits on tectonically stable Bermuda and tectonically emergent Barbados. Higher-elevation terraces at two California localities, in the Palos Verdes Hills and on San Nicolas Island, have corals with ages that range mostly from ˜121,000 to ˜116,000 yr BP, correlative with marine isotope substage 5e. These ages are similar to those reported for other terraces in southern California b...
Bulletin, Southern California Academy of Sciences, 2011
... the Schulz Ranch, Santa Ana Mountains, Orange County, California. The member was composed pre... more ... the Schulz Ranch, Santa Ana Mountains, Orange County, California. The member was composed predominantly of coarse-grained, light-colored, cross-bedded arkosic sandstone and minor boulder beds. To eliminate confusion with the Schulz Member of the Talpa Formation of ...
... the Schulz Ranch, Santa Ana Mountains, Orange County, California. The member was composed pre... more ... the Schulz Ranch, Santa Ana Mountains, Orange County, California. The member was composed predominantly of coarse-grained, light-colored, cross-bedded arkosic sandstone and minor boulder beds. To eliminate confusion with the Schulz Member of the Talpa Formation of ...
Recent molluscan types currently housed in the Malacology Section of the Natural History Museum o... more Recent molluscan types currently housed in the Malacology Section of the Natural History Museum of Los Angeles County are listed herein. Each type lot entry includes original species/subspecies name, original genus, author, original citation, type status, LACM number, number of specimens and preservation, type locality or collection locality, collector [if known], date collected [if known], and current taxonomic status if different from original description. INTRODUCTION This catalog is published in accordance with Recommendation 72F.4 of the International Code of Zoological Nomenclature (Ride & others, 2000:79). This listing includes all molluscan type material currently housed at the Natural History Museum of Los Angeles County and supercedes the type listing of Sphon (1971). To date 1922 molluscan type lots (71,000+ specimens) are reported for 1147 species and 99 subspecies, which includes 589 holotypes, 1277 paratype lots, 10 lectotypes, 13 paralectotype lots, 29 syntype lots, 3...
Compared to their Recent counterparts, fossil abalone are rare and poorly known. Their taxonomy i... more Compared to their Recent counterparts, fossil abalone are rare and poorly known. Their taxonomy is problematic, because most of the 35 fossil species have been described from single specimens and shell characteristics of Recent species are extremely plastic. Thus, the use of fossil species in phylogeny is questionable. Abalone first appear in the Upper Cretaceous (Maastrichian) with one species each in California and the Caribbean, are unknown in the Paleocene, and appear again in the late Eocene and Oligocene of New Zealand and Europe. They are regularly found from the late Miocene to the Recent in tropical to temperate regions worldwide. Most records are from intensely studied areas: SW North America, Caribbean, Europe, South Africa, Japan, and Australia. Despite their highest present-day diversity being found in the Indo-Pacific, their scarcity in the fossil record in this region is remarkable. The family may have originated in the central Indo-Pacific, Pacific Rim, or Tethys. An extensive list of all known fossil records including new ones from Europe and western North America is given. Fossil and Recent abalone both apparently lived in the shallow, rocky sublittoral in tropical and temperate climates. No on-shore/off-shore pattern is detected.
Neobernaya spadicea (Swainson, 1823) is the only representative of the family Cypraeidae in the n... more Neobernaya spadicea (Swainson, 1823) is the only representative of the family Cypraeidae in the northeast Pacific Ocean. It ranges from Monterey Bay, Monterey County, California, to southern Baja California Sur. This remarkable species is unmistakable and is unlikely to be confused with any other cypraeid.
Fossils of Columbian mammoths (Mammuthus columbi) and pygmy mammoths (Mammuthus exilis) have been... more Fossils of Columbian mammoths (Mammuthus columbi) and pygmy mammoths (Mammuthus exilis) have been reported from Channel Islands National Park, California. Most date to the last glacial period (Marine Isotope Stage [MIS] 2), but a tusk of M. exilis (or immature M. columbi) was found in the lowest marine terrace of Santa Rosa Island. Uranium-series dating of corals yielded ages from 83.8 ± 0.6 ka to 78.6 ± 0.5 ka, correlating the terrace with MIS 5.1, a time of relatively high sea level. Mammoths likely immigrated to the islands by swimming during the glacial periods MIS 6 (~ 150 ka) or MIS 8 (~ 250 ka), when sea level was low and the island–mainland distance was minimal, as during MIS 2. Earliest mammoth immigration to the islands likely occurred late enough in the Quaternary that uplift of the islands and the mainland decreased the swimming distance to a range that could be accomplished by mammoths. Results challenge the hypothesis that climate change, vegetation change, and decreas...
New high-precision thermal ionization mass-spectrometric (TIMS) U-series ages of solitary corals ... more New high-precision thermal ionization mass-spectrometric (TIMS) U-series ages of solitary corals (Balanophyllia elegans) from several marine terrace localities along the California and southern Oregon coasts date to the ˜80,000 yr BP high stand of sea, correlative with marine isotope substage 5a, late in the last interglacial complex. Ages of multiple corals from localities north of Point Año Nuevo (central California) and San Nicolas Island (southern California) suggest that this high sea stand could have lasted at least 8000 yr, from ˜84,000 to ˜76,000 yr BP. These ages overlap with those from marine deposits on tectonically stable Bermuda and tectonically emergent Barbados. Higher-elevation terraces at two California localities, in the Palos Verdes Hills and on San Nicolas Island, have corals with ages that range mostly from ˜121,000 to ˜116,000 yr BP, correlative with marine isotope substage 5e. These ages are similar to those reported for other terraces in southern California b...
Bulletin, Southern California Academy of Sciences, 2011
... the Schulz Ranch, Santa Ana Mountains, Orange County, California. The member was composed pre... more ... the Schulz Ranch, Santa Ana Mountains, Orange County, California. The member was composed predominantly of coarse-grained, light-colored, cross-bedded arkosic sandstone and minor boulder beds. To eliminate confusion with the Schulz Member of the Talpa Formation of ...
... the Schulz Ranch, Santa Ana Mountains, Orange County, California. The member was composed pre... more ... the Schulz Ranch, Santa Ana Mountains, Orange County, California. The member was composed predominantly of coarse-grained, light-colored, cross-bedded arkosic sandstone and minor boulder beds. To eliminate confusion with the Schulz Member of the Talpa Formation of ...
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