Definition of Echinoids. Meaning of Echinoids. Synonyms of Echinoids

- the Ordovician and Silurian periods of Estonia are famous for echinoids. Paleozoic echinoids probably inhabited relatively quiet waters. Because of their...
- spines. Later echinoids had more robust tests and fossilised well, usually with the spines detached from the test. Fossils of echinoids are common in...
- The Gnathostomata are a superorder of sea urchins, including the familiar sand dollars. Gnathostomatans are irregular in shape, but unlike other irregular...
- coins lost by mermaids. Sand dollars diverged from the other irregular echinoids, namely the c****iduloids, during the early Jur****ic, with the first true...
- Melonites is an extinct genus of sea urchin from the family Palaechinidae. Species belonging to this genus lived during the late Mississippian (Meramecian)...
- prehistoric echinoids is an attempt to create a comprehensive listing of all genera from the fossil record that have ever been considered to be echinoids, excluding...
- Irregularia is an extant infraclass of sea urchins that first appeared in the Lower Jur****ic. These particular sea urchins are distinguished from other...
- middle of the nineteenth century, another name commonly used for fossil Echinoids was 'thunderstone', though other fossils such as belemnites and (rarely)...
- Generalized pedicellaria of an (a) asteroid and (b) echinoid...
- sessile forms belonging to the orders Cyrtocrinida and Millericrinida. Echinoids (sea urchins) underwent substantial diversification beginning in the Early...