Echinoderm Flashcards
a marine invertebrate of the phylum Echinodermata, such as a starfish, sea urchin, or sea cucumber.
Echinoderm
an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates.
Endoskeleton
a defensive organ like a minute pincer present in large numbers on an echinoderm.
Pedicellariae
a perforated plate by which the entry of seawater into the vascular system of an echinoderm is controlled.
Madreporite
one of the numerous minute canals lined with choanocytes which radiate from the paragastric cavity in some sponges and end just below the surface of the sponge.
Radial canal
the circular water tube that surrounds the esophagus of echinoderms. 2 : the circular canal in the edge of the umbrella of a jellyfish that links the radial canals.
Ring canal
A mobile C-arm is a medical imaging device that is based on X-ray technology and can be used flexibly in various ORs within a clinic. The name is derived from the C-shaped arm used to connect the X-ray source and X-ray detector to one another.
Arm / Ray
symmetry around a central axis, as in a starfish or a tulip flower.
Radial Symmetry
the property of being divisible into symmetrical halves on either side of a unique plane.
Bilateral Symmetry
(in an echinoderm) a network of water vessels in the body, the tube feet being operated by hydraulic pressure within the vessels.
Water Vascular System
his ambulacral groove extends from the mouth to the end of each ray or arm. Each groove of each arm in turn has four rows of hollow tube feet that can be extended or withdrawn
Ambulacral Groove
a very small bone, especially one of those in the middle ear.
Ossicles
one of the tubular pouches opening into the alimentary canal in the pyloric region of most fishes.
Pyloric Caecum
The pylorus is considered as having two parts, the pyloric antrum (opening to the body of the stomach) and the pyloric canal (opening to the duodenum). The pyloric canal ends as the pyloric orifice, which marks the junction between the stomach and the duodenum.
Pyloric Stomach
…consists of a mouth; an esophagus; a two-chambered foregut; a midgut with outpocketings called digestive glands, or hepatopancreas; and a hindgut, or rectum. The large anterior foregut, or cardiac stomach, occupies much of the posterior aspect of the head and the anterior thoracic body cavity.
Cardiac Stomach
a roughly spherical flask with two handles, used in ancient Rome.
Ampullae
an organ that produces gametes; a testis or ovary.
Gonads
Central disc protrusion is a type of herniated or bulging disc that affects the spinal cord and could possibly result in nervous system disorders, such as radiating pain and muscle weakness as well as other symptoms stemming from nerve irritation. … Radiating or traveling pain along the nerve.
Central Disc
(in an echinoderm) each of a large number of small, flexible, hollow appendages protruding through the ambulacra, used either for locomotion or for collecting food and operated by hydraulic pressure within the water-vascular system.
Tube Feet
External fertilization is a male organism’s sperm fertilizing a female organism’s egg outside of the female’s body. Internal fertilization, on the other hand, is the occurrence of internal insemination as the mode of combining sperm and egg. … The release of eggs and sperm into the water is known as spawning.
External Fertilization
the action or process of regenerating or being regenerated, in particular the formation of new animal or plant tissue.
Regeneration
a starfish
Sea star
Brittle stars or ophiuroids are echinoderms in the class Ophiuroidea closely related to starfish.
Brittle star
a marine echinoderm that has a spherical or flattened shell covered in mobile spines, with a mouth on the underside and calcareous jaws. Many species are harvested for food.
Sea urchin
a flattened sea urchin that lives partly buried in sand, feeding on detritus.
Sand dollar
a sedentary marine echinoderm that has a small body on a long jointed stalk, with featherlike arms to trap food.
Sea lilies
an echinoderm with a small disklike body, long feathery arms for feeding and movement, and short appendages for grasping the surface.
Feather stars
an echinoderm that has a thick, wormlike body with tentacles around the mouth. They typically have rows of tube feet along the body and breathe by means of a respiratory tree.
Sea cucumbers
Sea daisies are small, circular animals related to sea stars. … Sea daisies have no arms, but the circle is rimmed with flat spines that look like daisy petals. The upper surface of the animal is delicately plated. The bottom surface has a mouth frame that leads to a shallow stomach and has a single ring of tube feet.
Sea daisies
