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Prepared By: Maglasang, Mary Grace C.
What is Phylum Arthropoda?
From the greek (arthron, joint, +pous, podos, foot)
It includes spiders, scorpions, ticks, mites, crustaceans, millipedes, centipedes, insects and other less well-known groups.
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General Characteristics
The most species-diverse phylum in the animal kingdom.
60 cm in length and most are much smaller.
Usually active and energetic animals.
Eukaryotic phylumJointed legs
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Mode of NutritionThey utilize all modes of feeding.CarnivoryHerbivoryOmnivoryMost are herbivorousMany aquatic antropods are
omnivorous.
Reproductionmost arthropods are normally sexual and
gonochoristic, but can be parthenogenetic. fertilization may be external or internal in aquatic
arthropods always internal in terrestrial species
Sperm Transfer sperm transfer usually by mating or copulation females usually store the sperm in a seminal
receptacle
HabitatLive everywhere.AirLandFresh brackish and
marine water
Scientific classification
Classification
Phylum ArthropodaSubphylum Trilobita (extinct)
Subphylum ChelicerataSubphylum Crustacea
Subphylum Uniramia (insects)
Subphylum Trilobita
Trilobita refers to the trilobed shape of the body in cross section, caused by a pair of longitudinal grooves.
Most of them are scavengers.
General Description
Trilobites had three main body regions: Head apparently composed of four fused
segments, bearing a pair of antennae and, sometimes, compound eyes;
Thorax with a variable number of separate segments.
Abdomen consisting of several fused segments.
Everything we know about Trilobites therefore is derived from fossils, nobody has ever seen a live one.
2 to 7 cm in length. exclusively marine animals
General Description
Mode of Nutrition
Some trilobites were active predators, whereas others were scavengers, and still others probably ate plankton.
Habitatthe seas of the worldMarine animals
LocomotionSwimming
Crawling
Reproduction the female simply releases
its eggs into the open water and the male follows suit by releasing its sperm.
the male uses a specialized pair of appendages on its abdomen, the so-called "pleopods", to transfer its sperm to the female.
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