What is an example of Ophiuroidea?
Basket starsOphiuridaOphiothrix fragilisOphiacant…OphiopholisOphiocano… fugiens
Brittle stars/Lower classifications
What characteristics are shared by all Ophiuroids?
Ophiuroids exhibit the three distinctive characteristics of the phylum Echinodermata: a body plan with five part symmetry (pentaradial), an internal calcium carbonate skeleton in the mineral form of calcite, and a water vascular system of fluid-filled vessels that end in tube feet.
How many species of Ophiuroidea are there?
Ophiuroids are a large group (over 1600 species) of echinoderms that includes the brittle stars (Ophiurida) and basket stars (Euryalida).
What is the larva of Ophiuroidea?
Indirect developing ophiuroids have three primary larval types: ophiopluteus, vitellaria, and doliolaria. In addition, some ophiuroids undergo direct development (reviewed in Hendler, 1991; Strathmann & Rumrill, 1987).
How do ophiuroids feed?
Ophiuroids are generally scavengers or detritivores. Small organic particles are moved into the mouth by the tube feet. Ophiuroids may also prey on small crustaceans or worms. Basket stars in particular may be capable of suspension feeding, using the mucus coating on their arms to trap plankton and bacteria.
What is the function of the dermal Branchiae?
papula; also occasionally papulla, papullae), also known as dermal branchiae or skin gills, are projections of the coelom of Asteroidea that serve in respiration and waste removal.
Why are brittle stars called brittle stars?
Brittle stars are named for their ability to break off an arm in order to escape predators; the arm will grow back. They move by articulating their long, flexible arms rather than using tube feet like sea stars. This species is sometimes called the tiger-striped brittle star.
What is the difference between Asteroidea and Ophiuroidea?
But within the phylum, sea stars and brittle stars are in different classes. Sea stars are in the class Asteroidea, where brittle stars are in Ophiuroidea, which also includes basket stars.
What is the main difference between starfishes and a brittle star?
The key difference between starfish and brittle star is the mode of movement; starfish uses tube feet for their movement whereas brittle star moves using their long arms. Additionally, the starfish has a complete digestive system with both mouth and anus.
What phylum is an Echinoid?
EchinodermSea urchins / Phylum
What is Holothuroid in biology?
Noun. 1. Holothuroidea – class of echinoderms including the sea cucumbers. class Holothuroidea. Echinodermata, phylum Echinodermata – radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers.
What does Pycnopodia do to some of its prey?
In Puget Sound this species excavates butter clams (Saxidomus gigantea) by picking up sediment particles over the clam, passing them out to the ends of the rays, and dropping them. Often eat urchins such as Strongylocentrotus purpuratus, whose spines may pierce through from the stomach to the aboral surface.
What does pedicellaria mean?
noun, plural ped·i·cel·lar·i·ae [ped-uh-suh-lair-ee-ee]. Zoology. one of the minute pincerlike structures common to starfish and sea urchins, used for cleaning and to capture tiny prey. GOOSES. GEESES.
What is the papula?
A papule is a solid or cystic raised spot on the skin that is less than 1 centimeter (cm) wide. It is a type of skin lesion.
What is the difference between starfish and brittle star?
Star fish and brittle star are exclusively marine echinoderms. The key difference between starfish and brittle star is the mode of movement; starfish uses tube feet for their movement whereas brittle star moves using their long arms. Additionally, the starfish has a complete digestive system with both mouth and anus.
What phylum is a sand dollar?
EchinodermSand dollar / Phylum