Phylum: Echinodermata

Class: Echinoidea - Echinoids
Irregular echinoids (heart urchins, etc. )

Irregular urchins - " They burrow along the sea floor and bulk-feed on the sediment to extract nutrients. For this reason the radial symmetry inherited from the regulars has been modified; the mouth moving to the front of the animal to collect food and the anus moving to the rear to leave waste behind. "
Cretaceous period:
Hemiaster whitei Strata: Goodland  Period:  Cretaceous (103-105 mya) Loc: Tarrant Co., TX.  July 4, 2008.	Hemiaster calvini   Strata: Grayson Period:  Cretaceous (95-97 mya) Loc: Tarrant Co., TX.  Aug. 1, 2007.
Heteraster sp.   Strata: Goodland Period:  Cretaceous (c. 103-5 mya) Loc: Tarrant Co., TX.	Heteraster sp. Strata: Goodland or Walnut?  Period:  Cretaceous (c. 105 mya) Loc: Tarrant Co., TX.?
Holaster sp. Strata: Weno?  Period:  Cretaceous (98 mya) Loc: Denton Co., TX.  Sep. 8, 2007.	Holaster sp.   Strata: Fort Worth? Period:  Cretaceous (100 mya) Loc: Tarrant Co., TX.  Sep. 9, 2007.
Holaster sp.   Strata: Weno?  Period:  Cretaceous (98 mya) Loc: Tarrant Co., TX.  June 17, 2007.	Holaster simplex [+] Strata: Duck Creek (lower) Period:  Cretaceous (100-101 mya) Loc: Tarrant Co., TX.
Holaster simplex? Strata: Weno Limestone? Period:  Cretaceous (100-101 mya) Loc: Denton Co., TX.
Macraster sp.   Strata: Duck Creek (lower limestone) Period:  Cretaceous (101 mya) Loc: Tarrant Co., TX.  Aug. 14, 2008.	Macraster sp. Strata: Fort Worth  Period:  Cretaceous (100 mya) Loc: Tarrant Co., TX.  July 7, 2007.
Macraster washitae   Strata: Duck Creek Period:  Cretaceous (100-101 mya) Loc: Tarrant Co., TX.	Macraster sp. [+] Strata: Fort Worth  Period:  Cretaceous (100 mya) Loc: Tarrant Co., TX.  Aug. 2, 2008.
Pseudananchys sp.?????   Strata: Grayson Period:  Cretaceous (95-97 mya) Loc: Tarrant Co., TX.  March 23, 2008. (found by Roz)	Pseudananchys sp. Strata: Grayson Period:  Cretaceous (95-97 mya) Loc: Denton Co., TX.  Aug. 16, 2008. (found by Linda McCall)
Coenholectypus sp.   (Holectypus limitis) Strata: Mainstreet Period:  Cretaceous (97 mya) Loc: Tarrant Co., TX.  Oct. 20, 2007.
Lefortia sp. (new species?)  Strata: Marlbrook? Period:  Cretaceous  Loc: Arkansas.  July 2007.	Lefortia sp. (new species?)  Strata: Marlbrook? Period:  Cretaceous  Loc: Arkansas.  July 2007.