|
Species |
crinoid |
|
Geological Period |
Jurassic ≈ 157 ma |
|
Origin |
Erfoud, Morocco |
|
Size |
2.0 - 3.0cm |
Fossil crinoid that preserves the part of the stem.
Crinoids (Crinoidea) are a class of echinoderm animals, also known as 'sea lilies', due to the branched appearance of their arms.
They live fixed to the bottom of the sea by means of a calcareous peduncle, or they move slowly in cases where they do not have a peduncle. The body is chalice-shaped and ends in five highly branched arms covered with spikes or pinnules. The mouth is in the center of these five arms, which the animal extends to filter food from the marine waters where it lives.
The most easily found fossils are sections of the stem or arms. However, in certain areas splendid fossilized specimens appear on plates that show the organism as a whole.
After their appearance, crinoids spread over a wide variety of marine habitats.
The group suffered its greatest crisis during the Permian period, when most of its species perished, with only a few passing through the Triassic period.
The fossil includes a label with the name, period and provenance and is attached to a 4 cm square cardboard box.
*The price is per unit (a single cardboard box of the four shown in the photo)
Since the samples are natural, you will receive a piece similar to the one in the photograph. The fossils come in cardboard boxes and are glued to a porex base with hot silicone; these can be removed using ethyl alcohol without damaging the fossil. The size is approximate.