Chapter 33 Flashcards
Invertebrates
- lack a back bone
- account for over 95% of known animal species
Sponges are in the phylum ____
Porifera
Sponges _____ (name some common characteristics of them)
- are sessile
- lack tissues
- live in marine water or fresh water
- are filter feeders
filter feeders _____
capture food particles that are suspended in the water that passes through their body
In sponges water is drawn through pores into the _____
spongocoel
In sponges water that is in their body goes out through the _____
osculum
Sponges ____ have germ layers
DO NOT
The type of cell in sponges that generate a water current through the sponge in order to ingest suspended food
Choanocytes
Sponges consist of a gelatinous noncellular ____ layer between two cell layers
mesohyl
the type of cells in sponges that are totipotent and help digestion and to manufacture skeletal fibers
amoebocytes
Sponges ___ function as hermaphrodites
DO
sequential hermaphroditism
function first as one sex and then function as the ther
diploblastic - a sac with a central digestive compartment (the gastrovascular cavity)
body plan of cnidarians
The phylum that cnidarians belong to
eumetazoans
the gastrovascular cavity of cnidarians act as a _____ and contractile fibers can work against it to cause movement
hydrostatic skeleton
the cells on tentacles that can help to capture prey
cnidocytes
the cells that are specialized within cnidocytes that eject a stinging thread
nematocysts
the clade that includes all cnidarians that produce a medusa
medusozoans
organism that exists only as a polyp and reproduces asexually by budding
hydra
organism that alternates between polyp and medusa form
hydrozoans
organism that resembles a jelly but is a colony of hydrozoa polyps
man-o-war
clade that includes corals and sea anemones and occur only as polyps
anthozoa
corals form with algae to secrete an ____
exoskeleton
segmented body, hard exoskeleton, jointed appendages
body plan of arthropods
