Systematic position
Kingdom: Animalia
Sub-kingdom: Eumetazoa
Super-phylum: Ecdysosoa
Phylum: Arthropoda
Sub-phylum: Crustacea
Carapace of Penaeus (red) Source: Wikipedia
Crustaceans Characteristics
Ø Usually marine aquatic arthropods
Ø Head and thorax fused to form cephalothorax
Ø Cephalothorax usually covered by single large carapace
Ø Two pair of antennae (only arthropod with two pairs of antennae)
Carapace of Crab (Source Wikipedia)
Ø 5 pairs of cephalic appendages
Ø Cephalic appendages: first pair antennules, second pair antennae, third pair mandibles, fourth pair first maxillae and fifth pair second maxillae
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Ø Thoracic and abdominal appendages are biramous
Ø First pair of antennae (antennules) are uniramous
Ø Respiration through gills
Ø Excretion by green glands or antennal glands
Ø Sense organs: antennae, statocysts and eyes
Sally Lightfoot Crab (Malacostraca, Wikipedia)
Ø Eyes are compound
Ø Paired gonopores
Ø Development usually indirect (direct forms also present)
Ø Larval stage is called nauplius
Classification of Crustacea:
Sub-phylum Crustacea is divided into six classes:
Class 1 : Branchiopoda
Class 2 : Remipedia
Class 3 : Cephalocarida
Class 4 : Maxillopoda
Class 5 : Ostracoda
Class 6 : Malacostraca
Sub-phylum Crustacea and its Classes
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