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Invertebrates Cheat Sheet by

Invertebrates Intro Bio 2

Porifera

"­spo­nge­s"
basal animals
no true tissue
sedentary
marine or freshwater
suspension feeder

Bilate­rians

Lophot­roc­hozoa
bilateral sym
Ecdysozoa
triplo­blastic
Deuter­ostomia
true coelom
 
2 openings

Mollusca

gastro­pods, bivalves, cephal­opods
marine
coelomate
open circ system
soft bodied with hard shell
intell­igence in cephal­opods

Annelida

Polych­aetes
bristle worms
Oligoc­haetes
earthworm leeches
fused rings
coelomates
closed circ system

Echino­derms

sea stars/­urc­hins/ cucumbers, sand $, brittle stars
slow moving­/se­ssile
endosk­eleton of ossicles
external sex repro
 

Ctenophora

comb jellies
basal eumeta­zoans

Lophot­roc­hozoa

-proto­stomy
Platyh­elm­inthes
flatworms
Syndermata
rotifers
Mollusca
molluscs
Annelida
annelids

Plathe­lmi­nthes

flatworms
bilateral sym
acoelomate
aquatic
single opening
parasitic: tapeworm

Arthopoda

segmented body plan
cuticle
open circ system
specia­lized jointed appendages
- walking, feeding, sensory, reprod, defense

Arthopoda subphyla

Chelic­erate
horseshoe crab, scorpians, ticks, mites, spiders
Myriapod
centip­edes, millipedes
Crustacean
crab, lobster, shrimp, barnacles
Hexapod
insects and relatives

Chordates

Notochord
dorsal hollow nerve cord
pharyngeal slits
post anal tail
 

Cnidaria

jellyfish, anemones, corals, hydras
radial symmetry
diplob­lastic
sessil­e/m­otile
sac w/ central digestive compar­tment
single opening

Syndermata

rotifers
aquatic
pseudo­coe­lomate
two opening
parthe­nog­enesis

Ecdyso­zoans

most species rich animal group
protosomy
ecdysis
shedding of cuticle
cuticle
tough exoske­leton 4 support and protection

Nemotoda

roundworms
parasitic
live in body fluids
reproduce sexually
internal fertil­ization

Deuter­ostomia

Echino­derms and chordates
shared develo­pmental charac­ter­istics (deute­ros­tomy)
radial indete­rminate cleavage
anus from blastopore
 

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