animal kingdom
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191 Terms
Fundamental basis of animal classification
Level of organisation, symmetry, germ layers, coelom, segmentation, notochord
Cellular level of organisation seen in
Porifera
Tissue level of organisation seen in
Coelenterata and Ctenophora
Organ level of organisation first seen in
Platyhelminthes
Organ-system level of organisation seen from
Annelida onwards
Incomplete digestive system has
Single opening
Complete digestive system has
Mouth and anus
Open circulatory system means
Blood directly bathes tissues
Closed circulatory system means
Blood flows through vessels
Asymmetry seen in
Sponges
Radial symmetry seen in
Coelenterates, Ctenophores and adult Echinoderms
Bilateral symmetry seen in
Annelids onwards
Diploblastic animals have
Ectoderm and Endoderm
Mesoglea is present in
Coelenterates
Triploblastic animals have
Three germ layers
Coelom is
Body cavity lined by mesoderm
True coelom seen in
Annelida onwards
Pseudocoelom seen in
Aschelminthes
Acoelomate animals
Platyhelminthes
Metamerism first seen in
Annelida
Notochord is
Mesodermal rod-like structure
Animals with notochord
Chordates
Non-chordates range from
Porifera to Echinodermata
Water canal system present in
Porifera
Ostia are
Minute pores in sponges
Spongocoel is
Central cavity of sponge
Osculum is
Opening of sponge
Choanocytes are
Collar cells
Digestion in sponges
Intracellular
Sponge skeleton made of
Spicules or spongin
Cnidoblasts contain
Nematocysts
Cnidocytes function
Defence and prey capture
Coelenterates show
Diploblastic organisation
Body forms in Cnidaria
Polyp and Medusa
Alternation of generation called
Metagenesis
Comb plates present in
Ctenophora
Bioluminescence seen in
Ctenophores
Flatworms are
Platyhelminthes
Flame cells function in
Excretion and osmoregulation
Roundworms are
Aschelminthes
Aschelminthes are
Pseudocoelomates
Annelids possess
True coelom and segmentation
Nephridia function
Excretion
Closed circulation first seen in
Annelida
Largest phylum
Arthropoda
Arthropod exoskeleton made of
Chitin
Excretion in arthropods
Malpighian tubules
Respiration in arthropods
Gills, book lungs or trachea
Second largest phylum
Mollusca
Mantle cavity contains
Gills