Sea urchins are a major component of recent marine communities where they exert a key role as grazers and benthic predators. However, their impact on past marine organisms, such as crinoids, is hard ...

by S K Donovan Publication date 1983 Usage Attribution-Noncommercial 3.0 Collection biostor; additional_collections Language English Volume 26 Item Size 5.3M Addeddate 2020-01-25 02:56:47 Identifier ...

Note that there is no way to know whether these columnals come from blastoids or crinoids except that blastoids are typically smaller with very fine columnals. 4. Holdfast (#1250) - the crinoid ...

The Crinoidea, a class of marine echinoderms, have long captivated palaeontologists as one of the most enduring and diverse components of the marine fossil record. Their evolutionary history spans ...

Lengths of crinoid stalk segments consisting of multiple columnals (pluricolumnals) from the Fort Payne Formation of south-central Kentucky (Mississippian) were tested for uniformity using simulations ...

These parasites embedded at the articulation between columnals, forcing the columnals to grow around them and producing with time a conical pit surrounded by swollen stereom. If the parasite died ...

The crinoid has between 20 and 22 arms that can reach up to 5.5 inches long, according to the study. The animal’s stalk is shorter than its arms, about 2.5 inches long, researchers said.

BORN TO CRAWL. Stalked crinoids such as this Endoxocrinus parrae may not be stick-in-the-muds. New research shows movement as fast as 140 meters per hour. Baumiller and Messing ...

Abstract Sea urchins are a major component of recent marine communities where they exert a key role as grazers and benthic predators. However, their impact on past marine organisms, such as crinoids, ...