Arthropods

 

The phylum of arthropods has the largest number of species known on earth today. It is the phylum of the ubiquitous insects and even trilobites. Arthropods belong to the superphylum Ecdysozoa. They are protostomians. They are bilaterally symmetrical animals with segmentation called somites. They have paired limbs, chitinous cuticle as an exoskeletal covering and a reduced coelom which extends into a haemocoele. They exhibit tagmatosis which is the formation of tagmata (divisions) of the limbs. There is also conspicuous cephalization.

They are usually divided into six classes:

a)      Onychophora e.g. Peripatus

b)      Trilobites which are fossil arthropods e.g. Olenus

c)      Crustacea e.g. Astacus

d)      Myriapoda e.g. Lulus

e)      Insecta e.g. Aedes aegypti

f)       Arachnida e.g. Spider Araneus diadematus

 

bullet Life taxonomy
bullet Evolution
bullet Alternative theory

There is nothing in medicine not found in this website

Electronic School of Medicine
Creator: Oluwole Ogunranti

    

Main Subject Course Links

Anatomy Anesthesia Biochemistry Chemical pathology Community Health
Dermatology ENT Gynecology Hematology Imaging
Medicine Medical microbiology Obstetrics Ophthalmology Pathology
Pediatrics Pharmacology Physiology Psychiatry    Surgery/Orthopedics
eLab eOSCE eProcedures eInvestigations eSchool
eOrgans eLocator Anatomy Museum eDissector eFractures
All diseases eClerking eTreatment eDoctor ePatient