Bio Lab 6 (Chordata) Flashcards
(28 cards)
phyla
Echinodermata and Chordata
symmetry
echinodermata: as larvae, they are bilateral. ONLY ADULTS radially symmetrical
chardata have bilateral symmetry
germ layers
both are triploblastic
organs of echinodermata?
have ossicles (plates) embedded in their skin. have a water vascular system with tube feet
- have 5 repetitive parts (pentaradial) but larvae are bilaterally symmetrical
- 5 classes depend on arrangement of ossicles
coelom?
both are coelomates
mouth and anus?
both have mouth and anus
are they protostomes or deuterostomes?
deuterostomes
deuterostomes
Radial cleavage- aligned division
Indeterminate- individual cells can form whole embryo (identical twins)
Blastopore associated with anus
echinodermata
sea stars, sea urchins, sand dollars and sand cucumbers
- have ossicles
- have a unique vascular system that end in tube feet
chordata
mammals, fish, reptiles, birds, amphibians
class asteroidea
sea stars
- have a mouth on the oral surface an anus on the top (aboral surface)
- have dermal gills on aboral surface and pincers that help get things off of it that grow
- have a madreporite for water vascular system that connects to the water on the aboral surface
- have ambulacral grooves
- have pedicellariae to remove debris from the surface
class ophiuroidea
brittle stars
- arms detach easily
- grooves are closed and reduced feet are not used to move, the arms are
class crinoidea
sea Lillies and feather stars
(stalked sea stars)
- use their branched arms in filter feeding
- their oral surface faces up and are usually more sessile
class echinoidea
sea urchin and sea dollars
- ossicles are fused into a solid shell test
- have five teeth called Aristotle’s lantern that allow it to eat
- have barbed spines that can be toxic
class holothuroidea
sea cucumbers
- have modified tube feet called tentacles
- radial symmetry is less evident
- can rupture in defence
chordata organ
- have a dorsal hollow nerve chord
- have a notochord
- have pharyngeal gill slits
- post anal tail
subphyla cephalochordata
lancets
- has a buccal cavity and gill arches that water must wash over
- water enters through the atrium and leaves through the atriopore
- pretty cephalized
Agnatha, in subphyla cephalochordata
lampreys and hagfish
- ammocoete is the larvae
- mouth is at the centre of the buccal funnel
- parasitic
- jawless and limbless
- larvae is an ammocoete
subphyla vertebrata
Agnatha, chondrichthes, osteichtyes, amphibia etc.
Chondrichthyes in vertebrata
sharks, skates and rays
- endoskeleton is made of cartilage and the gill arches are modified into jaws
class Osteichthyes in vertebrata
bony fish
- very diverse
- gills are protected by an operculum
class amphibia in vertebrata
frogs, toads and salamanders, caecilians
- go through metamorphosis
- lay eggs in water but can still be out of water
class reptilia in vertebrata
crocodiles, alligators, turtles, snakes and lizards
- very hard skin, protected by scales
- have watertight eggs with 4 parts
class aves in vertebrata
birds
- maintain a body temp
- type of reptile!
- hollow bones
- came from Dinos!
- have a lightweight skeleton etc. to fly
