USNM806i, Cerros de los Monos, El Antimonio, Sonora (Permian of Mexico)

Where: Sonora, Mexico (30.8° N, 112.6° W: paleocoordinates 11.7° N, 40.3° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Antimonio Formation, Wordian (268.8 - 265.1 Ma)

• "Monos Beds"; Leiorhynchoidea-Cancrinella Zone is third-highest (of 7) in the succession

Environment/lithology: marine; calcareous shale

• Reddish limestone shale and sandy limestone

Size class: macrofossils

Preservation: replaced with silica

Primary reference: G. A. Cooper, C.O. Dunbar, H. Duncan, A.K. Miller, and J.B. Knight. 1953. Permian fauna at El Antimonio, western Sonora, Mexico. Smithsonian Miscellaneous Collections 119(2):1-111 [D. Bottjer/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 40823: authorized by David Bottjer, entered by Matthew Clapham on 01.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Pectinida - Deltopectinidae
"Aviculopecten montpelierensis" = Streblopteria montpelierensis
"Aviculopecten montpelierensis" = Streblopteria montpelierensis Girty 1910 scallop
 Nuculida - Nuculidae
"Nucula" spp. Lamarck 1799 nut clam
Two species represented
 Protobranchia - Nuculanidae
"Nuculana obesa" = Polidevcia obesa
"Nuculana obesa" = Polidevcia obesa White 1879 pointed nut clam
Gastropoda
 Euomphalina - Omphalotrochidae
? Omphalotrochus "sp. A" Meek 1864 snail
 Pleurotomarioidea - Pleurotomariidae
? Pleurotomaria "sp. A" Defrance 1826 snail
? Pleurotomaria "sp. B" Defrance 1826 snail
Strophomenata
 Productida - Echinoconchidae
"Waagenoconcha montpelierensis" = Bathymyonia nevadensis
"Waagenoconcha montpelierensis" = Bathymyonia nevadensis Meek 1877
 Productida - Productellidae
Liosotella magnirugosa n. sp. Cooper 1953
Liosotella rugosa Cooper 1953
 Productida - Productidae
"Dictyoclostus" sp., "Muirwoodia sp." = Yakovlevia
"Muirwoodia sp." = Yakovlevia Fredericks 1925
 Productida - Linoproductidae
 Productida - Chonetidae
"Chonetes" foshagi n. sp. Cooper 1953
Rhynchonellata
 Athyridida - Neoretziidae
Hustedia shumardi Torres-Martínez et al. 2016
Includes new subspecies "plicatella"
 Athyridida - Athyrididae
Composita sp. Brown 1849
 Terebratulida - Notothyrididae
 Terebratulida - Dielasmatidae
 Spiriferinida - Reticulariinidae
"Spiriferellina laxa" = Reticulariina laxa
"Spiriferellina laxa" = Reticulariina laxa Girty 1909
 Spiriferinida - Paraspiriferinidae
"Punctospirifer convexus n. sp." = Paraspiriferina convexa
"Punctospirifer convexus n. sp." = Paraspiriferina convexa Cooper 1953
 Spiriferida - Spiriferellidae
Spiriferella "sp. 1" Tschernyschew 1902
 Rhynchonellida - Wellerellidae
Wellerella sp. Dunbar and Condra 1932
Wellerella lemasi Cooper 1953
Wellerella rotunda n. sp. Cooper 1953
? Uncinunellina pulchra n. sp. Cooper 1953
 Rhynchonellida - Rhynchoporidae
 Rhynchonellida - Petasmariidae
Leiorhynchoidea cloudi n. sp. Cooper 1953
 Rhynchonellida - Stenoscismatidae
Stenoscisma sp. Conrad 1839
Lingulata
 Lingulida - Disciniidae
Orbiculoidea "sp. 2" d'Orbigny 1847