[Last updated 26 Jan 2024]

Phylum: Echinodermata

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.
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. 
Goniophorus scotti
 
Strata: Grayson Marl.
Period:  Cretaceous (95-97 mya)
Loc: Tarrant Co., TX.  10 Mar 2019
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

Goniopygus budaensis? echinoid
  
Strata: Denton Clay/ Weno Ls?
Period:  Cretaceous (98.5-99 mya)
Loc:  Tarrant Co., TX.  Aug. 15, 2010.
Goniopygus budaensis? echinoid

Strata: Pawpaw Fm.
Period:  Cretaceous (c. 98 mya)
Loc:  Tarrant Co., TX.  Nov. 3, 2007.


"Cidarid" type echinoids:

Phyllacanthus sp. 
  [+]
Strata:  Weno Ls.
Period: Cretaceous  (98-99 mya)
Loc: Tarrant Co., TX.  [Reid Coll. 2013]
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