Echinodermata 3

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 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