ch.7 part 2

23 cards·by kmikay

gonads

organ that contains germ tissue produced in gametes

broadcast spawning

release of gametes into water

metamorphosis

marked change in form during embryological development

encrusting

describing an organism that grows as a crust

glass sponges

deep water sponges with skeleton fused silica spicules

boring sponges

sponges that bore through skeleton and shell

sclerosponges

sponges with a massive calcareous skeleton

cnidarians

invertebrates with nematocysts and radial symmetry

radial symmetry

regular arrangement of similar body parts around a central axis

oral surgace

area of an animal located near the mouth

aboral surace

the area of the animal located by the anus

tentacles

a flexivle elongate appendage

gut

organ that absorbs nutrients

nematocysts

the stinging structure of cnidarians

polyp

the cnididrical typically attached stage of cynidarians

medusa

the bell shaped free swimming stage of cnidarians

planula

the ciliated larvae of cnidarians

epidermis

the outermost layer

gastrodermis

stomach lining

mesoglea

layer between epidermis and gastrodermis

class hydrozoa

cnidarians whose life cycle typically includes a colonial polyp and medusa

siphonophores

hydrozoans that exist as drifting colonies

class sycphozoa

cnidarians whose life cycle includes conspicous medusa and a reduced or absent polyp