Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/18

Click to flip

18 Cards in this Set

  • Front
  • Back
-fluid-filled internal body cavity
-organisms having this characteristic
-coelom
-coelomates
"first mouth"--animals in which the mouth arises from the blastopore--includes molluscs, annelids, and arthropods
protostomes
"second mouth"--animals in which the anus arises from the blastopore--includes echinoderms, protochordates, and chordates
deuterostomes
dividing embryo cellds are offset from one another
spiral cleavage
dividing embryo cells are aligned
radial cleavage
--process in which the ball of cells indents and grows inward
--opening of the indentation
-gastrulation
-blastopore
--the body cavity is formed from a solid sheet of mesodermal cells splitting
--the body cavity is formed from outpocketings of the gut that pinch off
--schizocoely
--enterocoely
mechanical structure in which the outer wall encloses a fluid core
hydrostatic organ
remnant of the notochord in adult mammals with a full vertebral column--a small core of gel lying between vertebrae
nucleus pulposus
part of digestive tract immidiately posterior to the mouth
pharynx
blocks of muscle
myomeres
aquatic, free floating lifestyle, often planktonic
pelagic
life on marine substrate, adult protochordates consist mostly of this type
benthic
retention of larval characteristics in the adult (two terms)
paedomorphosis (neoteny)
branch of protochordates with pharyngeal slits, dorsal nerve cord, but no notochord or postanal tail
--includes enteropneusta (acorn worms) and pterobranchia
hemichordates
group that includes hemi-, uro-, and cephalo-chordates
protochordates
larvae of hemichordates
tornaria
sexual characteristic in which sperm and eggs are produced in the same gonad
protandrous