Term
|
Definition
| Spiny skin, 5-part symmetry; Asteroidea (Sea stars), Ophiuroidea (brittle and basket stars), Holothuroidea (sea cucumbers), Echinoidea (sand dollars and sea urchins), Crinoidea (sea lilies, feather stars) |
|
|
Term
|
Definition
| Calcareous plate enclosing the body; may have gaps or pores for protruding gills |
|
|
Term
|
Definition
| Small jaws on the surface of urchins and stars for defense |
|
|
Term
| Circulatory/movement system |
|
Definition
| Echinoderms have a water vascular system, with no heart or blood vessels; instead they have a ciliated body cavity lining; An aboral madreporite connected to the ring canal, from which radial canals project, connected to ampullae with tube feet on the oral surface |
|
|
Term
|
Definition
| Sea stars; evert stomachs onto or into prey to digest outside the body |
|
|
Term
|
Definition
| Brittle stars and Basket stars; respire through bursal slits; viscera are within central disks |
|
|
Term
|
Definition
| Ophiuroideans; have vertebrae in removable arms allowing serpentine movement; gonads and guts in central disk |
|
|
Term
|
Definition
| Ophiuroideans; Arms branch dichotomously into many branchlets |
|
|
Term
|
Definition
| Sea cucumbers; use tentacles to feed; have calcareous spicules instead of ossicles; Respiratory trees branch off the cloaca |
|
|
Term
|
Definition
| Chewing mouth part in Echinoideans (Sea urchins and sand dollars) |
|
|
Term
|
Definition
| Sand dollars and Sea urchins |
|
|
Term
|
Definition
| Echinoideans; Ossicles form a globe-shaped test; full of yummy gonads |
|
|
Term
|
Definition
| Sea lilies and feather stars |
|
|
Term
|
Definition
| Crinoideans; can either hold onto a reef with aboral feet-like cirri, or swim around; Filter feed wiht feathery pinnule-covered arms |
|
|
Term
|
Definition
| "tiny feather" on featherlike arm of Crinoidean feather stars |
|
|
Term
|
Definition
| Crinoidean; sessile with a stalk; filter feeders |
|
|
Term
|
Definition
| A filter-feeding ancestral deuterosome gave rise to Echinoderms, Hemichordates, and Chordates |
|
|
Term
|
Definition
| Part chordate; have pharyngeal slits, dorsal hollow nerve chord and notochord; larvae resemble those of echinoderms; filter feed; Acorn worms and pterobranchs |
|
|
Term
|
Definition
| Hemichordate; worm-like; has a three-part body with proboscis, collar, and trunk; solitary mud-dwellers |
|
|
Term
|
Definition
| Hemichordates; Have three-part segmented body similar to acorn worms; colonial organisms |
|
|
Term
| Four features of Chordates |
|
Definition
1) dorsal hollow nerve chord
2) cartilage or bone notochord
3) post-anal tail
4) pharyngeal slits for respiration and filter-feeding |
|
|
Term
|
Definition
1)Urochordata
2)Cephalochordata,
3)Craniata |
|
|
Term
|
Definition
| Part of chordata; filter feed with pharyngeal slits and incurrent and excurrent siphon; most are tunicates |
|
|
Term
|
Definition
| Urochordates; sessile filter feeders; free-swimming tadpole larvae with a dorsal notochord and hollow nerve tube; Adult form turns nerve tube into ganglion |
|
|
Term
|
Definition
| Urochordates; free-swimming filter feeders; lose larval tail to form barrel shape, move by contraction of the digestive atrium |
|
|
Term
|
Definition
| Urochordates; Display neoteny, retaining free-swimming "tadpole" form as adults |
|
|
Term
|
Definition
| Retaining juvenile form in mature adults; according to Garstang's Hypothesis this was an important step in the evolution of chordates |
|
|
Term
|
Definition
| Subclade of chordates; look like small blind fish; example is the Lancelet or Amphioxus |
|
|
Term
|
Definition
| Cephalochordate; Lancelets; look like small blind fish; sand-dwelling filter-feeders |
|
|
