cnidarian body parts Flashcards
Hydrozoa tentacles
defense and prey capture
Hydrozoa mouth
ingestion of food, elimination of indigestible particles (egestion)
Hydrozoa cnidocytes
cells located in epidermal layer of tentacles and body wall, discharge barbs for capturing prey or deterring predators
hydrozoa gastrovascular caviity
chamber where extracellular digestion occurs, only opening is mouth
hydrozoa bud
product of asexual reproduction
hydrozoa gonads
organs for sexual reproduction; individuals are dioecious, have either testes or ovaries
hydrozoa basal disk
attach to substrate
hydrozoa epidermis
outer tissue layer, protection
hydrozoa gastrodermis
inner tissue layer, digestion
hydrozoa mesoglea
inert gelatinous substance for supporting the body
hydrozoa feeding polyp (hydranth)
polyp for food acquisition
hydrozoa hypostome
mound of tissue to regulate size of mouth opening
hydrozoa gonangium
polyp for reproduction
hydrozoa medusa buds
product of asexual reproduction; released from gonangium
hydrozoa perisarc
translucent outer covering
scyphozoa marginal tentacles
provide sensory information, defense and locomotion
scyphozoa oral arms
defense and prey capture
scyphozoa gonads
organs for sexual reproduction (testes and ovaries), gametes released into gastric pouches and exit body through mouth
scyphozoa gastric pouch
one of four divisions of gastrovascular cavity for digestion
scyphozoa radial canals
extensions of gastric pouches and distribute nutrients throughout body
scyphozoa circular canals
circular extension of gastric pouches that distributes nutrients to outer rim
scyphozoa rhopalium
sensory organ that responds to gravity and sometimes light to maintain equilibrium
anthozoa oral disk
raised portion of mouth
anthozoa gonads
gametes released into gastric pouches and exit through mouth
anthozoa ostium
pore that allows circulation of fluids between adjacent body sections
anthozoa pharynx
muscular portion of gastrovascular cavity for pulling prey inward and expelling particles
anthozoa retractor muscles
expand and contract body
anthozoa primary septum
one of six thin walls that divide body into sections; provides support and increased surface area
anthozoa secondary septum
further subdivides the body
anthozoa pedal disk
fleshy base that attaches organism to substrate
anthozoa acontia
contain cnidocytes and extend through mouth to subdue prey or deter predators
