Definitions Flashcards
Coelomate
Having a body cavity fully lined with mesoderm
Coelom
True body cavity, tube within a tube
Pseudocoelomate
Having a body cavity not completely lines with mesoderm
Protostomate
“First mouth”, mouth developed first
Heterotroph
Gets its food from another source
Germ tissue
Embryonic tissue that gives rise to other tissues (ectoderm, mesoderm, endoderm)
Eukaryotic
Having cells with organelles and a membrane-bound nucleus
Filter feeder
Obtains food particles by filtering water or soil
Hermaphrodite
Has both male and female parts
Gastrovascular cavity
Not a true digestive system found in Cnidaria and Platyhelminthes
Radula
Scraping device used in snails for digestion
Amoebocyte
Cell functioning in digestive, reproductive, and spicule formation in sponges
Choanocyte
“Collar cells”
Functioning in feeding and reproduction in sponges
Spincule
Skeletal element of a sponge
Cnidocyte
Stinging cells on the tentacles of Cnidaria
Medusa
Free-swimming stage of Cnidaria, reproduces sexually
Polyp
Stalk-like stage of Cnidaria, reproduces asexually
Metanephridia
Found in Annelida for excretion, open into the coelom
Protonephridia
Found in Platyhelminthes and Nematoda for excretion, closed by a terminal cell
Mantle (Mollusca)
Surrounding membrane of visceral mass
Spiracle and trachea
Used for respiration in Anthropa, spiracle = pores
Chitinous excoskeleton
Found in arthropods, hard outer layer made of chitin
Cephalization
Tendency to develop a head (anterior)
Tube feet
Used for movement in echinoderm as well as suction in predation
