Class: Echinoidea - Echinoids
(regular echinoids)
Cretaceous period (click for Pennsylvanian Period) |
" Regular echinoids have no front or back end. The opening for the mouth (peristome) is on their underside, and the opening for the anus (periproct) is on top. When viewed from above or below their profile is circular and radially symmetrical " |
Order: Phymosomatoida
Family: Phymosomatidae
Genus: Pymosoma
Phymosoma sp. echinoid![]() ![]() Strata: Grayson Ls. Period: Cretaceous (95-97 mya) Loc: Tarrant Co., TX. Oct. 1, 2008. |
Phymosoma sp. echinoid![]() Strata: Grayson Ls. Period: Cretaceous (95-97 mya) Loc: Tarrant Co., TX. 11 Aug 2007. |
Order: Euechinoidea
Family: Pseudodiadematidae
Genus: Tetragramma
Tetragramma sp. echinoid ![]() ![]() Strata: Goodland Ls. Period: Cretaceous (103-105 mya) Loc: Tarrant Co., TX. July 4, 2008. |
Order: Salenioida
Family: Saleniidae
Genus: Salenia
Salenia mexicana echinoids![]() ![]() Strata: Goodland Ls. Period: Cretaceous (103-105 mya) Loc: Tarrant Co., TX. July 12, 2008. |
Salenia mexicana echinoid![]() ![]() Strata: Goodland Ls. Period: Cretaceous (103-105 mya) Loc: Tarrant Co., TX. 2008. |
Salenia volana![]() ![]() ![]() Strata: Weno Ls. Period: Cretaceous (98-99 mya) Loc: Tarrant Co., TX. Aug 15, 2010. |
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Leptosalenia texana![]() ![]() ![]() Strata: Glen Rose Fm. Period: Cretaceous (108-113 mya) Loc: South Texas. Dan W. |
Order: Salenioida
Family: Hyposaleniidae
Genus: Goniophorus
Goniophorus scotti![]() ![]() ![]() Strata: Grayson Marl. Period: Cretaceous (95-97 mya) Loc: Tarrant Co., TX. Aug. 22, 2009. |
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Goniophorus scotti![]() ![]() ![]() Strata: Grayson Marl. Period: Cretaceous (95-97 mya) Loc: Tarrant Co., TX. 10 Mar 2019 |
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Goniophorus scotti![]() Strata: Grayson Marl. Period: Cretaceous (95-97 mya) Loc: Tarrant Co., TX. Oct. 9, 2007. |
Goniophorus sp. ![]() Strata: Fort Worth Ls.? Period: Cretaceous (100 mya) Loc: Tarrant Co., TX. Aug. 18, 2007. |
Goniophorus sp.![]() ![]() Strata: Fort Worth Ls. Period: Cretaceous (100 mya) Loc: Tarrant Co., TX. May 10, 2008. |
Goniophorus sp.![]() Strata: Fort Worth Ls. Period: Cretaceous (100 mya) Loc: Tarrant Co., TX. Sept. 26, 2009. |
Order: Arbacioida
Family: Arbaciidae
Genus: Goniopygus
"Cidarid" type echinoids:
Phyllacanthus sp. ![]() ![]() ![]() Strata: Weno Ls. Period: Cretaceous (98-99 mya) Loc: Tarrant Co., TX. [Reid Coll. 2013] |
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Plates and spines from cidarid echinoid.![]() Strata: Grayson Ls. Period: Cretaceous (96-97 mya) Loc: Tarrant Co., TX. Dec. 23, 2006. |
Plates and spines from cidarid echinoid.![]() Strata: Del Rio Clay Period: Cretaceous (98 mya) Loc: McLennan Co., TX. Nov. 17, 2007. |
A cidarid type echinoid spine![]() Strata: Weno? (uppermost) Period: Cretaceous (98-99 mya) Loc: Tarrant Co., TX. July 4, 2007. |
Misc echinoids:
Pedinopsis texana? echinoid![]() ![]() Strata: Mainstreet/Grayson Ls. Period: Cretaceous (97 mya) Loc: Denton Co., TX. Aug 16, 2008. |
Leptarbacia sp.? echinoid![]() Strata: Mainstreet Ls. Period: Cretaceous (97 mya) Loc: Tarrant Co., TX. Jas Cypert. |
Pseudananchys sp. echinoid
(pics by Roz)![]() ![]() Strata: Mainstreet/Grayson Ls. Period: Cretaceous (97 mya) Loc: Denton Co., TX. 14 March 2009 |