Lamprey-Agnatha
Shark-Chond rich thyes
Turtle-Amphibia
Lizard-Reptilia
Shipworm
Glowworm
Earthworm
Tapeworm
leech
tapeworm
earthworm
slug
Fishes
Reptilia
Echinodermata
Mammalia
Insecta
Arachnida
Crustacea
Polychaeta
allopatric
sibling species
morphospecies
sympatric
Echinodermata
Annelida
Chordata
Aschelminthes
Insecta
Myriapoda
Arachnida
Onychophora
Gills
Spiracles
Post anal tail
Chitious skeleton
Saw fish
Silver fish
Dogfish
Pipefish
shark
whale
frog
lizard
mollusca
cephalopoda
anneilida
arthropoda
Earthworm
Hydra
Ascaris
Scolopendra
moles, shrews and hedgehogs
monkeys, apes and man
whales and dolphins
kangaroo, lions and wolves
parasitic flatworms
free living flatworms
parasitic tapeworms
free living tapeworms
Archaeopteryx is a connecting link between mammals and aves
Duck-bill platypus is a connecting link between reptiles and mammals
Sea horse is a connecting link between fish and horse
Hydra is a connecting link between protozoa and metazoa
Scales
Eggs
Shelled eggs
Gills
dinosaur
duck
fossil bird
monotreme mammal
Annelida
Mollusca
Echinodermata
Arthropoda
Insecta
Protozoa
Mammalia
Aves
flat worms
roundworms
tapeworms
blind worms
fishes with a sinlge gill aperture
insects with a single pair of functional spiracles
mammals with a single common cloacal opening
protozoans with single flagellum
annelida
peripatus
insects
acolopendra
Fishes and Echinodermata
Coelentrata and Echinodermata
Porifera and Coelentrata
Echinodermata and Protochordata
primitive burrowing egg laying mammal
advanced egg laying reptile
primitive egg laying reptile
primitive aquatic egg laying animal
Lizard
Frog
Rabbit
Cuttlefish
Protozoa and Metazoa
Invertebrata and Vertebrata
Chordata and Non-chordata
Anaima and Enaima
Echidna
Kangaroo
Pangolin
Panda
Cestoda
Trematoda
Sporozoa
Suctoria
Hystrin
Tachyglossns
Diadelphyes
None of these