scholarly journals Late Cretaceous Oysters from the Pacific Slope of North America: Revision of Named Species and Discovery of New Species

2017 ◽  
Vol 525 ◽  
pp. 25-53
Author(s):  
Richard L. Squires
2002 ◽  
Vol 76 (2) ◽  
pp. 386-390 ◽  
Author(s):  
L. R. Saul ◽  
R. L. Squires

Nerineoids, so typical of the Jurassic and Early Cretaceous in Europe, are usually rare and lacking in diversity in North America north of Mexico. This is especially true of the Pacific slope faunas. Only three species of nerineoid gastropods have previously been reported from the Cretaceous of California (Saul and Squires, 1998). The oldest of these species, Aphanoptyxis andersoni Saul and Squires, 1998, is from the Early Cretaceous (Hauterivian) in northern California. The other two species are Late Cretaceous (Turonian): Aphanoptyxis californica Saul and Squires, 1998, is from northern California, and Nerinella santana Saul and Squires, 1998, is from a locality and strata in southern California near the occurrence of Nerinella califae n. sp. The description of N. califae n. sp. gives California the greatest diversity of Turonian northeastern Pacific slope nerineoids, namely, Aphanoptyxis californica and two species of Nerinella. These Turonian nerineoids are also, thus far, the geologically youngest North American Pacific slope nerineoids.


1993 ◽  
Vol 67 (6) ◽  
pp. 965-979 ◽  
Author(s):  
L. R. Saul

Four new venerid species from the Cretaceous of the North American Pacific Slope are described and four previously described species are reassigned. Of the new species, two are allotted to new genera: Rhaiphiale based upon Rhaiphiale pharota n. sp. and Egrona based upon Egrona fallax n. sp., both Turonian in age and from southern California. The other new species are Loxo quintense n. sp., of late Maastrichtian age from California, and Paraesa cedrina n. sp., late Albian in age from Baja California, Mexico. The previously described species “Meretrix” arata Gabb, 1864, Turonian, and “?Meretrix” fragilis Gabb, 1869, late Maastrichtian, are placed in the new genus Callistalox; “Meretrix” lens (Gabb, 1864), Campanian age, and Flaventia zeta Popenoe, 1937, Turonian, are provisionally assigned to Paraesa Casey, 1952. This is the first identification of Paraesa from the Pacific Slope of North America. No species of Flaventia Jukes-Brown, 1908, is now known in Pacific Slope faunas.


2021 ◽  
Vol 73 (3) ◽  
pp. A241220
Author(s):  
Rodney M. Feldmann ◽  
Carrie E. Schweitzer

Two well preserved specimens of nephropid lobster from the Late Cretaceous (late Campanian) Point Loma Formation in San Diego County, California, form the basis of description of a new species of Hoploparia. The occurrence represents the southernmost fossil record of macrurans along the Pacific coast of North America and it is only the third fossil lobster from California.


1969 ◽  
Vol 47 (3) ◽  
pp. 387-393 ◽  
Author(s):  
Michael J. Tynen

The following new species of littoral enchytraeid are described from the east coast of Vancouver Island, British Columbia—Enchytraeus cryptosetosus, Lumbricillus mirabilis, L. vancouverensis, L. georgiensis, L. qualicumensis, L. belli. These descriptions bring the number of North American Enchytraeus spp. to 6 and that of Lumbricillus spp. to 13. Existing evidence suggests that the enchytraeid fauna of the Pacific slope is quite distinct from that of the rest of North America and may have closer affinities with that of the northwest Pacific.


1996 ◽  
Vol 70 (3) ◽  
pp. 381-399 ◽  
Author(s):  
William P. Elder ◽  
L. R. Saul

North American Pacific Slope deposits of Coniacian to Maastrichtian age have yielded eight biostratigraphically useful species of Anchura: A. (Helicaulax?) popenoei new species, Coniacian; A. halberdopsis new species, early Campanian; A. callosa Whiteaves, 1903, early Campanian; A. falciformis (Gabb, 1864), late early to middle Campanian; A. phaba new species, middle to late Campanian; A. ainikta new species, middle to late Campanian; A. gibbera Webster, 1983, late Campanian to early Maastrichtian; A. baptos new species, late Maastrichtian to early Danian. In addition, two other possible species are A. nanaimoensis (Whiteaves, 1879), middle to late Campanian, and Anchura? new species, late Maastrichtian. These species together with two additional Turonian species, A. (Helicaulax) tricosa Saul and Popenoe, 1993, and A. (H.) condoniana Anderson, 1902, allow the definition at least eight Late Cretaceous Anchura zones for the Pacific Slope. These zones have durations of 1.5 m.y. to 4 m.y.Anchura (H.?) popenoei from northern California appears most closely related to A. (Helicaulax) tricosa Saul and Popenoe, 1993, of Turonian age from southern California. Anchura callosa, A. falciformis, A. nanaimoensis, and A. phaba appear to be closely related based on sculptural elements, as does A. gibbera despite having an anterior spur on the wing. However, these species appear to belong to two latitudinally differentiated faunal provinces. Species having a northern range include A. callosa, A. falciformis, and A. nanaimoensis, whereas A. phaba and A. gibbera are from more southern deposits, as are also A. halberdopsis, A. ainikta, and A. baptos.


1990 ◽  
Vol 64 (4) ◽  
pp. 552-556 ◽  
Author(s):  
Richard L. Squires

The marine bivalve Fimbria susanensis n. sp. is reported from the uppermost Paleocene part of the “Meganos Stage” in the upper Santa Susana Formaton, Simi Hills, southern California.Fimbria pacifica n. sp. is reported from the middle lower Eocene “Capay Stage” strata of the Pacific coast of southwestern North America. The new species is present in the lower Bateque Formation, Baja California Sur, Mexico, and in the lower Juncal Formation, Whitaker Peak area and Santa Ynez Mountains, southern California.Fimbria susanensis n. sp. and F. pacifica n. sp. are the only fimbriids known from the Pacific coast of North America. Previously reported Pacific coast species, which gave a range of Late Cretaceous to late Eocene for this genus in this particular area, do not belong to Fimbria.


2001 ◽  
Vol 75 (1) ◽  
pp. 46-65 ◽  
Author(s):  
Richard L. Squires ◽  
Louella R. Saul

Two new genera and ten new species of shallow-marine, warm-water gastropods are reported from several Upper Cretaceous formations found between British Columbia and southern California. The buccinid Zaglenum new genus is represented by two new species and the turbinellid Fimbrivasum new genus is represented by three new species. The nododelphinulid Trochacanthus pacificus new species is the first record of this genus in the Western Hemisphere, and the procerthiid Nudivagus? califus new species could be the first record of this genus on the Pacific slope of North America. The xenophorid Xenophora (Endoptygma) hermax new species is only the second known Cretaceous species of this genus on the Pacific slope of North America, and this species establishes that Endoptygma Gabb, 1877, is a valid taxon. The neritid Otostoma sharonae new species is only the fourth known Cretaceous species of this genus on the Pacific slope of North America. The ringiculid Ringicula? (Ringiculopsis?) hesperiae new species is the first Campanian record of this genus on the Pacific slope of North America and the first recognition of this subgenus in this area.


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