Phylum Porifera (Sponge)

– Water enters through porocytes & flow out through osculum.

 

Phylum Cnidaria (Obelia, jellyfish)

– Diploblastic

– Acoelomate

– No excretory cells (through mouth)

– Nerve nets

– Polymorphism –polyps reproduce medusa

Obelia: mesoglea layer, enteron

 

Phylum Platyhelminthes (Taenia, flatworms)

– Triploblastic

– Acoelomate

– Bilateral symmetry

– Unsegmented

– Has excretory & osmoregulatory system

– No circulatory system

– Hermaphrodite

Taenia: proglottid (repetitive units)

 

Phylum Nematoda (Ascaris, roundworms)

– Triploblastic

– Pseudocoelomate

– Bilateral symmetry

– Unsegmented

– Complete digestive system (mouth & anus)

– Longitudinal muscle

– Cuticle

– Separate sexes (unisexual)

 

Phylum Annelida (Class Oligochaeta(few setae per segment)—Pherethima, segmented worms)

– Triploblastic

– Coelomate

– Segmented

– Complete digestive system

– Closed circulatory system with haemoglobin

– Excretory system with nephridia

– Longitudinal & circular muscles

– Setae/chatae to aid movement

– Hermaphrodites

__________________________________________

Phylum Arthropoda

– Triploblastic

– Bilateral symmetry

– Chitinous exoskeleton

– Jointed appendages

– Open circulatory system (lymph)

 

Class Arachnida (Lycosa, spider)

– No antenna

– Protosoma & opisthosoma

– Lungs/trachae

– Simple eyes

 

Class Insecta (Periplaneta, cockroach)

-1 pair of antenna

– Head, thorax, abdomen

 

Class Crustacea (Penaeus, prawn)

– 2 pairs of antenna

– Cephalothorax, abdomen

– Gills

– 1 pair of stalked eyes

_____________________________________________

Phylum Mollusca (Class Gastropoda–Helix, snail)

– Triploblastic

– Bilateral symmetry

– Ventral muscular foot

– Dorsal visceral mass

– Open circulatory system with haemolymph

– Excretion through nephridia

– Radula to scrape food

– Separate sexes

– Trochophore larva

 

Phylum Echinodermata (Holothuria, sea cucumber)

– Triploblastic

– Coelomate

– Bilateral symmetry (larva) ; Pentametric symmetry (adult)

– Water vascular system – tube feet

______________________________________________________

Phylum Chordata

– Pharyngeal gill slits

– Post-anal tail

– Dorsal hollow nerve cord

– Notochord

 

Class Chondrichthyes (Carcharodon, shark)

– Cartilaginous skeleton

– Heterocercal fins

– Paired fleshy fins

– No operculum

– Lateral line system

– Placoid scales

– Internal fertilisation

 

Class Osteichthyes (Tilapia, fish)

– Bony skeleton

– Homocercal fins

– Paired bony/cartilagous fins

– Have operculum

– Have swim bladders

– Cycloid scales

– External fertilisation

– Oviparous

 

Class Reptilia (Naja, cobra)

– Amniotic & leathery egg

– No external ears

– Ectothermic

– Three chambered heart

– Internal fertilisation

– Dry scaly skin

Advertisements