Echinoderm Flashcards
Echinoderm-
a marine invertebrate of the phylum Echinodermata, such as a starfish, sea urchin, or sea cucumber.
Endoskeleton-
an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates.
Pedicellariae-
a defensive organ like a minute pincer present in large numbers on an echinoderm.
Madreporite-
a perforated plate by which the entry of seawater into the vascular system of an echinoderm is controlled.
Radial canal-
ne 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.
Ring 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.
Arm / Ray-
anappendage on the starfish
Radial Symmetry-
symmetry around a central axis, as in a starfish or a tulip flower.
Bilateral Symmetry-
the property of being divisible into symmetrical halves on either side of a unique plane.
Water Vascular System-
(in an echinoderm) a network of water vessels in the body, the tube feet being operated by hydraulic pressure within the vessels.
Ambulacral Groove-
s an ambulacral ridge on the aboral side of each ray, known as an ambulacrum. These have interambulacra between them.
Ossicles-
a small piece of calcified material forming part of the skeleton of an invertebrate animal such as an echinoderm.
Pyloric Caecum-
one of the tubular pouches opening into the alimentary canal in the pyloric region of most fishes
Cardiac Stomach-
connects the stomach to the duodenum. 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).
Ampullae-
a cavity, or the dilated end of a duct, shaped like a Roman ampulla.
Gonads-
an organ that produces gametes; a testis or ovary.
Central Disc-
Central region of sea stars & brittle stars from which rays or arms radiate; contains madreporite, mouth, & anus
Tube Feet-
used for feeding, movement, and a little for respiration; located on ambulacral groove
External Fertilization-
is a strategy of fertilization in which a sperm cell unites with an egg cell in the open, rather than inside specialized organs within the bodies of the parents. In contrast, internal fertilization takes place inside the female after insemination through copulation.
Regeneration-
is the process of renewal, restoration, and growth that makes genomes, cells, organisms, and ecosystems resilient to natural fluctuations or events that cause disturbance or damage.
Sea star-
a starfish
Brittle star-
any echinoderm of the class Ophiuroidea, having the body composed of a central, rounded disk from which radiate long, slender, fragile arms.
Sea urchin-
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.
Sand dollar-
a flattened sea urchin that lives partly buried in sand, feeding on detritus.
Sea lilies-
a sedentary marine echinoderm that has a small body on a long jointed stalk, with featherlike arms to trap food.
Feather stars-
an echinoderm with a small disklike body, long feathery arms for feeding and movement, and short appendages for grasping the surface.
Sea daisies-
Sea daisies have been discovered in three localities, including deep-sea habitats
Sea Cucumbers
echinoderms from the class Holothuroidea. They are marine animals with a leathery skin and an elongated body containing a single, branched gonad. Sea cucumbers are found on the sea floor worldwide
