Phylum: Mollusca (Mollusks)

Class: Bivalvia - Bivalves - Pelecypods 
Order: Pectinida
 Family: Pectinidae
(scallops, pectens)

Pecten bellula Strata: Fort Worth? Period: Cretaceous (100 mya) Loc: Tarrant Co., Tx.  July 12, 2008.	Pecten bellula Strata: Fort Worth? Period: Cretaceous (100 mya) Loc: Tarrant Co., Tx.  June 11, 2011.
Neithea sp. Strata: Duck Creek Period: Cretaceous (100-102 mya) Loc: Tarrant Co., Tx.	Neithea sp.   Strata: Duck Creek Period: Cretaceous  (c. 100 mya) Location: Tarrant Co., TX.
Neithea sp. Strata: Goodland Period: Cretaceous (103-105 mya) Loc: Tarrant Co., Tx.	Neithea sp. Strata: Duck Creek Period: Cretaceous (100-102 mya) Loc: Tarrant Co., Tx.  June 17, 2007.
"sp." = species not known or unsure

Class: Bivalvia - Bivalves - Pelecypods 
Order: Pectinida
Family: Spondylidae
(Spondylus)

Spondylus sp. Strata: Mainstreet - Grayson Period: Cretaceous (96-97 mya) Location: Tarrant Co., Tx. 22 Aug 2009.