Taxonomical
Category
Porifera
Coelenterata/
Cnidaria
Ctenophora
Platyhelminthes Aschelminthes
Annelida
Arthropoda
Mollusca
Echindoremata
Sex
Separation
NO
Variable
NO
NO
Yes
Yes- Nereis
No-Earthworm,
leeches
Mostly yes
Mostly
yes
Yes
Fertilisation
Internal
Variable
External
Internal
Internal
External
Usually
internal
Variable
External
Development
Indirect
Indirect
Indirect
Many larval
stages
Variable
Monoeciousdirect
Variable
Indirect
Indirect
Dioeciousindirect
Nereis- posses
parapodia
which
aid in
swimming
Statocystsbalance
organ
Radula
Excretory
system absent
Pheretima,
Hirudinaria
Limulus,
Culex
Loligo,
Aplysia,
Dentalium,
Chaetopleura
Ophiura,
Antedon,
Cucumaria
Key Feature
Digestion is
intracellular
Medusajellyfish,
Aurelia
Polyp- Hydra,
Adamsia
Digestion is
intracellular &
extracellular
Flame cellosmoregualtion
and excretion
Pseudocoelomate
Example
Sycon
Meandrina,
Gorgonia,
Pennatula
Pleu
robrachia
Taenia
Ancyclostoma
Hemichordata
Cyclostomata
Condrichthyes Osteichthyes
Amphibia
Reptilia
Aves
Mammalia
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
External
Internal
Internal
External
External
Internal
Internal
Internal
Indirect
Variable
Viviparous
Oviparous,
Direct
Oviparous,
Variable
Oviparous,
Direct
Oviparous,
Direct
Direct
Ectoparasite,
closed
circulation
Marine
animals
4 pair of gills
Cloaca
Epidermal
scales or scutes
Hindlimbs
have scales
Pinnae present
Petromyzon,
Myxine
Pristis,
Scoliodon,
Trygon,
Torpedo
Pterophyllum
, Betta,
Clarias,
Exocoetus
Bufo,
Icthyophis
Bangarus,
Hemidactylus,
Chelone
Pavo,
Struthio,
Neophron,
Corvus
Balaenoptera,
Macaca,
Pteropus
Open
circulatory
system
Saccoglossus
Protochordata
Notochord:
Urochordatalarval tail
Cephalochordatahead to tail
(lifelong)
UrochordataAscidia, Salpa,
Doliolum
CephalochordataBranchiostomata