Starfish are echinoderms of the order Asteroidea. They appear in the fossil record during the Ordovician about 450 million years ago. Brittle Stars are closely related to Starfish and appear in the fossil record around the same time. Starfish and Brittle star fossils are not common as both disintegrate quickly after death.
Starfish or Sea Stars are Echinoderms of the order Asteroidea. They are marine dwelling organisms that can have three to twenty arms, but most have five to seven. They move by using hundreds of suction feet to crawl across the bottom.
What Is A Brittle Star?
Brittle Stars are Echinoderms of the class Ophiuroidea. They are marine dwellers with five arms around central body disk. They move by using their flexible arms to crawl along the bottom and in some cases swim short distances.
What Is The Difference Between Starfish And Brittle Stars?
Starfish and brittle stars are closely related but there are some notable differences. Starfish have anywhere from five to forty arms, while Brittle Stars have five. With Starfish, the arms blend together into the central body. Brittle Star arms attach to a well defined central disk. Both have calcite ossicles that form a skeleton-like structure. In Starfish these ossicles are fused together, while in the arms of Brittle Stars, they are independent allowing for a greater range of motion.
When Do Starfish And Brittle Stars First Appear?
Both Brittle Stars and Starfish appear about the same time in the fossil record, about 450 million years ago during the Ordovician Period.
When Do Brittle Stars And Starfish Die Out?
Strictly speaking they do not die out. There are over 2,000 species of Brittle Star and and equal number of Starfish. The diversity of species declined during the Devonian and Permian Extinctions but expanded significantly during the Early Jurassic.
Where Are Starfish And Brittle Star Fossils Found?
Starfish and Brittle Star fossils are uncommon. As the body decomposes around the ossicles they tend to fall apart and disperse. There are a few formations that are well known for their fossils including the Jurassic Solnhofen Limestone in Germany, Middle Cretaceous formations in Lebanon, some of the Ordovician formations in Southern Morocco, some of the Ordovician formations in Ontario.
Washington state has now joined over a dozen other states to put in place “shelter in place” or “stay at home” orders. While we agree this is the correct course of action, it will have a substantial impact on our business. It effectively shuts down much of our company for several weeks.
We will continue taking orders on our website and we will have a single staff member at our warehouse to facilitate shipping of these new orders. Depending on the order volume this may mean that we do experience some shipping delays, particularly with large or fragile items that require more packaging time.
These shutdowns are particularly devastating to all small businesses who don’t have significant cash reserves and rely on constant cash flow to pay their fixed expenses (payroll, rent, loan payments, etc) We hope that you will continue to support us and satisfy your fossil fix during these trying times.