MS Book and Mineral Company Echinodermata - part 1 Echinodermata - part 2 Fossil Specimen Index Paleontology Index Place an Order Catalogs on this Website
MS Book and Mineral Company  Echinodermata - part 3
Class Echnoidea continued
	Echin 23 Phylum Echinodermata Class Echinoidea Order Holectypoida Family Anorthopygidae Genus Anorthophygus Species texanus Sea Urchin:  Anorthophygus texanus San Martine Mbr., Boracho Fm, Washita Grp.,Culberson County, Texas, lower Cretaceous A “regular” sea urchin ( 3.5 cm x 3.5 cm) which has the pentaradial shape with some of the ambulacral grooves outlined with a natural brown material making the specimen very attractive; the peristome is on the lower, central surface; there are numerous faint concentric grooves on the test radiating around the central apex of the test; one  small apparent bruise on one side of the test $ 60
	Echin 24a Phylum Echinodermata Subphylum Echinozoa Class Echinoidea Subclass Euechinoidea  Order Spatangoida Genus Macraster Species texanus Sea Urchin:  Macraster texanus Ft. Worth Limestone, Kingston, Oklahoma early Cretaceous This heart shaped sea urchin measures 4.5 x 4 cm; Anterior ambulacral groove continuous from apex to peristome (easy to locate on this specimen); Periproct on posterior surface at about mid-height (difficult to locate on this specimen due to lack of good taphonomy  in area); ambulacral grooves deep and long; as noted, spotting on specimen indicates decay prior to the fossilization process $ 15
	Echin 24b Sea Urchin:  Macraster texanus Same phylogeny and location where found as above; Heart shaped sea urchin measures 3.5 x 3 cm; anterior ambulacral groove continuous from apex to peristome (difficult to locate on this specimen); Periproct on posterior surface at about mid-height; ambulacral grooves deep and long; surface smoother than above; one small imperfect spot on specimen $ 16
	Echin 25 Phylum Echinodermata Subphylum Eleutherozoa Class Echinoidea Order Spatangoida Family Loveniidae Genus Lovenia Species woodsii Sea Urchin:  Lovenia woodsii Otway Basin, Portland, Victoria, Australia early to middle Pliocene An “irregular” heart shaped sea urchin very similar to Lovenia forbesi which measures 2.5 x 2.5 cm; the periproct is located on the posterior flat edge of the test; individual plates of the test are apparent on the aboral side of the test; follow the anterior ambulacral groove forward and under the test to the peristome (which is located closer to the center of the carapace than usual); the spine tubercles are quite unusual as they are recessed into the test surrounded by a circular “moat" $ 16
	Echin 26 Phylum Echinodermata Class Echinoidea Order Clypeasteroida Suborder Scutellina Family Mellitidae Genus Encope Species tamiamiensis Sand Dollar:  Encope tamiamiensis Tamiami Fm, Charlotte County, Florida, Late Miocene A sand dollar measuring 5 x 4.5 cm; petals of the ambulacral groove pronounced on the aboral surface; actual individual plates of the test are apparent (separated by faint white lines); as with  all clypeasteroids, one large lunule is present  through the test near its flat posterior edge; the peristome is centrally located and the periproct opens near the lunule; species name derived from formation where found $ 30
	Echin 27 Phylum Echinodermata Class Echinoidea Order Clypeasteroida Suborder Scutellina Genus Dendraster Species ashley Sand Dollar:  Dendraster ashley Fernando Fm, Purisma Hills, Lompac, California, Pliocene This sand dollar has a natural slightly rough surface; it measures 3 x 3 cm; This “irregular” Echinoids also has some bilateral symmetry: the peristome (and mouth) are located on the inferior surface where the ambulacral grooves converge; the periproct (anus) is located also on the inferior surface posterior to the peristome not far from the posterior edge of the test. $ 10
	Echin 28a Phylum Echinodermata Class Echinoidea Order Spatangoida Genus Heteraster Species texanus Sea Urchin:  Heteraster texanus Comanche Peak Fm, Fredericksburg Grp., Clifton, Texas, early Cretaceous This heart shaped sea urchin measures 2.5 x 2 cm; it has the usual ambulacral pentamerous radial symmetry; the peristome is anterior and ventral while the periproct is posterior and on a dorsal, sloping surface; apical disc is centered on the aboral surface $ 14
	Echin 28b Sea Urchin:  Heteraster texanus Same phylogeny and location as above This heart shaped sea urchin measures 3 x 2.5 cm; it has the usual ambulacral pentamerous radial symmetry; the peristome is anterior and ventral while the periproct is posterior and on a dorsal, sloping surface; apical disc is centered on the aboral surface; it has one small imperfect spot $ 20
	Echin 29 Phylum Echinodermata Class Echinoidea Order Spatangoida Genus Lambertiaster Species ficheuri Sea Urchin:  Lambertiaster ficheuri Goodland limestone, Decatur, Texas, early Cretaceous This heart shaped sea urchin measuring 2 x 2 cm; has a pentaradial shape; follow the anterior arm of the ambulacral system onto the lower surface  to the peristome; the periproct poster edge of the test; the test looks almost smooth, but on closer inspection very small tubercles are present over the entire aboral surface $ 20
	Echin 30a Phylum Echinodermata Class Echinoidea Order Clypeasteroida Suborder Scutellina Genus Dendraster Species gibbsii San Dollar:  Dendraster gibbsii Lower Etchegoin (Jacalitos), Kettleman Hills, California, Pliocene This sand dollar has a natural rough surface; it measures 4 x 4 cm; the This “irregular” Echinoid also has some typical bilateral symmetry: the peristome (and mouth) is located on the inferior surface where the ambulacral grooves converge while the periproct (anus) is located also on the inferior surface posterior to the peristome not far from the posterior edge of the test. $ 20
	Echin 30b San Dollar:  Dendraster gibbsii Same phylogeny and location as above; but it larger at 5 x 5 cm $ 40
	Echin 30c San Dollar:  Dendraster gibbsii Same phylogeny and location as above; this one measures  4.5 x 4.5 cm; and it has been sanded and polished as indicated by the relections on the specimen $ 55
	Echin 32 Phylum Echinodermata Class Echinoidea Subclass Euechinoidea Order Cidaroida Genus Archaeocidaris Section of Sea Urchin:  Archaeocidaris Winchell Formation, Brown County, Texas, Pennsylvanian (Missourian) 10 x 9.5 cm This is a mass of urchin spines and basal plates on matrix of the Winchell Formation $ 85
MS Book and Mineral Company Echinodermata - part 1 Echinodermata - part 2 Fossil Specimen Index Paleontology Index Place an Order Catalogs on this Website