Cystoid Fossils For Sale

Cystoids are extinct echinoderms similar to crinoids. Their anatomy consists of a stalk, theca (body) and brachials (feeding arms). Most lived fixed to the seafloor but some were more mobile. Like modern echinoderms, cystoids were arranged in a pentaradial (five-fold symmetry)pattern and had a water vascular system. They first appeared in the Cambrian Period and disappeared in the Carboniferous.

6 Items ($19 to $695)

Multiple Silurian Cystoid (Caryocrinites) Fossils - New York

$695 $646

Plate of Silurian Cystoid (Caryocrinites) Fossils - New York #232153

8.8" Plate of Silurian Cystoid (Caryocrinites) Fossils - New York

$595 $553

Two Cystoid (Holocystites) Fossils - Indiana

$59 $54

Cystoid (Holocystites) Fossil - Indiana #190993

1.5" Cystoid (Holocystites) Fossil - Indiana

$19 $18

Cystoid (Holocystites) Fossil - Indiana #186794

1.6" Cystoid (Holocystites) Fossil - Indiana

$19 $18

Cystoid (Holocystites) Fossil - Indiana #186795

1.25" Cystoid (Holocystites) Fossil - Indiana

$19 $18

What Did Cystoids Look Like?

Cystoids resembled flowers, but were in fact animals. They had stems that attached them to the seafloor, a theca, and brachials. The theca contained the cystoid's vital organs and was made up of calcite plates forming a spherical or ovate body. The brachials were the feeding arms that extended from the top of the theca. These arms were arranged in three- or five-fold symmetry and funneled food to the mouth at their center.

What Is The Difference Between Cystoids And Crinoids?

Cystoids and crinoids look similar but have some distinct differences. The main difference is in the shape of the main body of the organisms. Cystoids had a spherical or ovate theca, while crinoids had a cup-shaped calyx. Cystoids also had triangular plates at body openings while crinoids have variably shaped plates.

CYSTOID FOSSILS FOR SALE

What Did Cystoids Look Like?

What Is The Difference Between Cystoids And Crinoids?