echinoids Flashcards
echinoid PHYLUM
echinodermata
echinoid CLASS
echinoidea
two types of echinoid
regular and irregular
what is ecnoid skeleton called
the test
what is the echinoid test made of
interlocking plates of calcite
what are the two areas of echinoid test called
ambulacra and interambulacra
how do you tell echinoid ambulacra and interambulacra apart?
ambulacra - pore pairs
interambulacra - tubercles
what way up were (reg) echinoids
mouth down booty up`
what was echinoid pore pair
allow tube feet to protrude
what were echinoid tube feet used for
movement, attachment and RESPIRATION
what was the echinoid madreporite for
taking in water for the water vascular system
what was the genital plate in echinoids used for
to release sperm and eggs into water column
what was the echinoid Aristotle lantern
5 chisel like teeth in mouth
did both types of echinoid ( reg and ireg) have an aristotole lantern
just regular
what makes an irregular ecinoid
PETALOID AMBULACRA - one lines up to mouth making heart shape
there are 5 petaliod ambulacra
what is the plastron (irregular echinoid)
area covered with tubercles for attachment of small spines to dig burrows
what is the labrum (irregular echinoid)
lip protruding over part of the mouth to block sediment
REG echinoid mode of life
benthonic, epifaunal
high energy
REG echinoid feeding
uses jaws (aristole lanterns) to graze algae on sea bed
reg echinoid symmetry
5 fold
REG echinoid ambulacra and interambluacra
run from the centre of the aboral (anus) surface to the oral surface
REG echinoid function of tube feet
respiration attachment and movement
do REG echinoid have fascioles?
NO!
IREGULAR echinoid mode of life
benthonic, infaunal
live in burrows
low energy
IREGULAR echinoid where are the cilia and what do they do?
in anterior groove, used to generate currents to waft waste from mouth to anal tube
IREGULAR echinoid wat is anterior groove?
where (one) petaloid ambulacra meets the mouth and makes a dent
IREGULAR echinoid feeding
particle feeding, extracts microrganisms from sea water
IREGULAR echinoid symmetry
bi lateral (1 PLANE)
IREGULAR echinoid ambulacra
run from the centre of the aboral surface but terminate forming petaloid ambulacra
IREGULAR echinoid interambulacra
modified over test surface
fused together over oral surface
one forms the plastron
IREGULAR echinoid function of tube feet
respiration, digging, burrowing and anal tube
IREGULAR echinoid fascioles
two present, one to direct water to mouth and one to direct waste away from the echioid
REGULAR echinoid what is apical system
10 plates in 2 rings around anus
5 genital plates (largest is madreporite)
REGULAR echinoid what is madreporite
largest gential plate, takes in water for the water vascular system
REGULAR echinoid what is a periproct
membrane surrounding anus
