Homonomous metamerism - answersegments that look the same
Heteronomous metamerism - answersegments that look different
Setae - answer= chaetae
hair like sticky projections used for movement
made of chitin
Parapodia - answerlike feet
,on sides of organism
what setae attach too
Annelida circulatory system - answerclosed
5 hearts
blood w/ hemoglobin (stores & traps oxygen)
Metanephridia - answerkidney
one in each segment of annelida
Annelida movement - answercrawling & swimming
move in circular & longitudinal fashion
longitudinal is shortening
contract sphincter muscle which makes them narrow
shortening + getting narrow allows movement
same land and water movement
Trochophore larva - answerboth annelids & mollusks have trochophore larva which indicates that they
may be closely related
link to annelids & mollusks
found in all mollusks and some annelids (polychaeta & marine)
Annelida classes - answer1. class polychaeta
2. class oligochaeta
3. class hirudinea
Class Polychaeta
,Phylum Annelida - answermany setae
well developed head
pharynx that can be extended outwards w/ jaws of chitin
parapodia
ex. sandworm, tubeworm, palalo worm, & fireworm
Tubeworm - answerchristmas tree worm
build tubes to live in
can close off tubes w/ operculum
class polychaeta
Palalo worm - answersegments filled w/ eggs
look like tapeworms
people in 3rd world countries eat them
reproductive orgies
come together during spawning periods (mass spawning over several nights)
tubeworm
class polychaeta
Fireworms - answerhave setae that sting
class polychaeta
Class Oligochaeta
Phylum Annelida - answerfew setae
earthworms
terrestrial
, can be 2 meters long
hermaphrodite
poorly developed head & sensory structure
clitellum
don't produce larvae
no parapodia
crop & gizzard (decomposing material)
Oligochaeta respiration - answertakes place via diffusion which is why skin is moist
Class Hirudinea
Phylum Annelida - answerfacilitated by anesthetic and anticoagulants
preserve their food
clitellum for reproduction
setae usually absent; no head or parapodia
some are carnivorous
open circulatory system (hemocoel & hemolymph)
coelom filled w/ mesenchyme (tissue)
leeches
blood sucking parasites
Hirudinea anesthetic & anticoagulants - answerleeches have chemicals in their mouths when they latch
onto host
apply an aesthetic to numb area
release anticoagulants to prevent blood from clotting
Hirudinea anticoagulant - answerhyrudin
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