Crinoid | Sea Lilies, Feather Stars & Stalked Echinoderms | Britannica
2024年9月28日 · Crinoid, any marine invertebrate of the class Crinoidea (phylum Echinodermata) usually possessing a somewhat cup-shaped body and five or more flexible and active arms. The arms, edged with feathery projections (pinnules), contain the reproductive organs and carry numerous tube feet with sensory.
Crinoids - British Geological Survey
Crinoids are marine animals belonging to the phylum Echinodermata and the class Crinoidea. They are an ancient fossil group that first appeared in the seas of the mid Cambrian, about 300 million years before dinosaurs.
Crinoid: Characteristics, Diet, Facts & More [Fact Sheet]
Crinoids, often referred to as sea lilies or feather stars, are some of the most ancient and enchanting inhabitants of the ocean’s depths. These marine creatures, with their feathery arms and intricate designs, resemble flowers more than the animals they truly are.
Crinoidea - Digital Atlas of Ancient Life
2020年5月26日 · Crinoids, like other members of the phylum Echinodermata, are exclusively marine animals with pentaradial symmetry and water-vascular systems. Though some groups have lost the stalk in adult forms, crinoids are considered to follow the stalked, radial morphology, as the stalkless forms are derived from stalked ancestors.
Crinoid - New World Encyclopedia
Crinoids, which include sea lilies and feather-stars, are marine invertebrates that make up the class Crinoidea of the echinoderms (phylum Echinodermata). Crinoids are characterized by a mouth on the top surface that is surrounded by feeding arms. They have a U-shaped gut, and their anus is located next to the mouth.
ADW: Crinoidea: INFORMATION
Crinoidea is a small class of echinoderms with around 600 species. Many crinoids live in the deep sea, but others are common on coral reefs. In most extant crinoids, primarily the shallow-water ones, there are two body regions, the calyx and the rays .
Phylogenetic taxonomy and classification of the Crinoidea ...
2017年2月22日 · The Crinoidea (Echinodermata) is one of the five major clades of living echinoderms and has a rich fossil record spanning nearly a half billion years. Using principles of phylogenetic taxonomy and recent phylogenetic analyses, we provide the first phylogeny-based definition for the Clade Crinoidea and its constituent subclades.
Crinoids | AMNH - American Museum of Natural History
These creatures look like flowering plants from a garden, but as their "petals" wave through the water, they catch food as it passes. These animals have been living in Earth's oceans for over 500 million years. And some types are still alive today!
Crinoids: Deep-sea Lily-like Animals - NOAA Ocean Exploration
2017年12月7日 · Their formal name, crinoid, means lily-like (thus, one of their common names), and although they appear superficially plant-like, they are animals, complete with digestive and nervous systems. Their closest relatives are the sea …
Feather star | Crinoid, Brittle Star & Sea Lilies | Britannica
Feather star, any of the 550 living species of crinoid marine invertebrates (class Crinoidea) of the phylum Echinodermata lacking a stalk. The arms, which have feathery fringes and can be used for swimming, usually number five. Feather stars use their grasping “legs” (called cirri) to perch on.
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