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Crinoids are marine invertebrates that make up the class Crinoidea.Crinoids that remain attached to the sea floor by a stalk in their adult form are commonly called sea lilies, while the unstalked forms, called feather stars [3] [4] or comatulids, are members of the largest crinoid order, Comatulida.
Promachocrinus fragarius, commonly known as the Antarctic strawberry feather star, is a species of stemless, free-swimming crinoid. It was one of several new species of Promachocrinus to be described in 2023. [1] The discovery of the species gained significant media attention. [2] [3] [4]
Elegant feather stars may grow to 20 cm in total length. They are variably coloured in yellow to brown and are occasionally variegated in yellow and brown. They have ten long arms with ciliated side branches that taper to a point. They have 20-30 cirri per arm. [2] The cirri of the elegant feather star
Comatulida is an order of crinoids.Members of this order are known as feather stars and mostly do not have a stalk as adults. The oral surface with the mouth is facing upwards and is surrounded by five, often divided rays with feathery pinnules.
Five extant classes of echinoderms are generally recognized: the Asteroidea (starfish, with over 1900 species), Ophiuroidea (brittle stars, with around 2,300 species), Echinoidea (sea urchins and sand dollars, with some 900 species), Holothuroidea (sea cucumbers, with about 1,430 species), and Crinoidea (feather stars and sea lilies, with ...
As well as crawling around, this feather star can swim short distances by flapping its arms. [6] Antedon bifida is dioecious, each individual being either male or female. Gametes are produced, mostly between May and July, from the genital canals found at the base of some arms. The eggs stick to the outside of the pinnules where fertilisation ...
A. bennetti is widespread in the Indo-West Pacific, from Bay of Bengal and Maldives to the Marshall Islands and from China to Australia, Bali and Indonesia.It is most commonly found between 5 and 25 meters depth, but there is a less common deep water variety that lives between 15 and 45 meters depth.
Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea (/ ˌ æ s t ə ˈ r ɔɪ d i ə /). Common usage frequently finds these names being also applied to ophiuroids, which are correctly referred to as brittle stars or basket stars. Starfish are also known as asteroids due to being in the class