Zoology lecture notes and study materials

Classification of Arthropoda with Identification Characters for Each Sub-Phylum and Class

How Arthropods further classified


Arthropods are classified into five sub-phylum and each then subdivide into classes (a total of 16 classes according to recent classification of animal taxa).

Phylum Arthropoda:

I.   Sub-phylum: Trilobitomorpha (extinct arthropods)

Class 1: Trilobita

II.   Sub-phylum: Chelicerata (spiders, horseshoe crabs)

Class 1: Arachnida
Class 2: Merostomata
Class 3: Pycnogonida

III.  Sub-phylum: Myriapoda (centipedes, millipedes)

Class 1: Chilopoda
Class 2: Diplopoda
Class 3: Pauropoda
Class 4: Symphyla

IV.  Sub-phylum: Crustaceae (crabs, prawns, shrimps)

Class 1: Branchiopoda
Class 2: Remipedia
Class 3: Cephalocarida
Class 4: Maxillopoda
Class 5: Ostracoda
Class 6: Malacostraca

V.   Sub-phylum: Hexapoda (insects)

Class 1: Insecta
Class 2: Entognatha

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Zoology lecture notes and study materials

Phylum Arthropoda : General Characters

what are the general characters of phylum arthropoda

Arthropoda is a largest Phylum of Kingdom Animalia, includes about 80% of all known animal species in the biosphere including terrestrial and aquatic biomes. The phylum includes insects, crustaceous, centipedes, millipedes, spiders etc. The word Arthropoda is derived from two Greek words, ‘arthro’ = joint and ‘podo’ = foot. Phylum Arthropoda is characterized by:

@. Segmented body plan

@. Paired jointed appendages

@. Chitinaceous exoskeleton


General characters of Phylum Arthropoda:

@. Cosmopolitan distribution

@. Presence of exoskeleton, made of chitin

@. Chitin= a structural homo-polysaccharide of N-acetylglucosamine linked by β-1, 4 glycosidic bond

@. Segmented appearance of body

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