Phyla: Arthropoda
By Sandro Iossa Martí
Original NameArthropods (arthropoda): from
greek, ἄρθρον, árthron, means articulate
(or joint) and ποδός, podós, means “foot”.
Features and Most Important Characteristics
Belong to Animalia and contain: Trilobitomorpha, Chelicerata, Myriapoda, Crustacea and Hexapoda.
Invertebrate animals
a. Exoskeleton Segmented body Jointed appendages Limbs and cuticles (exoskeleton) made of chitin 80% of all described living animal species Open circulatory systems Respiratory and Excretory system vary depending on the environment Terrestrial species use internal fertilization, aquatic both internal and external
fertilization
Fossil recordExistence of small arthropods about 541 to 539 million years ago in China mostly Early Cambrian fossil beds.
Sensory SystemSensory organs:
Compound eyes
Antennae
Pheromone
Respiratory System Aquatic arthropods:
gills covered by exoskeleton
Terrestrial arthropods: tracheae, book lungs
Digestive System Mouth-gulet
Stomach
Intestine
Anus
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