The document summarizes the characteristics of the phylum Arthropoda. It belongs to the animal kingdom and includes spiders, insects, crustaceans and others. Arthropods have jointed legs and segmented bodies. They are the most diverse phylum and live everywhere, including on land, in water and air. They exhibit various modes of nutrition from carnivory to herbivory. Reproduction is usually sexual, and locomotion methods include flying, swimming and crawling. The extinct subphylum Trilobita is also discussed, describing their trilobed body shape and existence as marine scavengers and predators over 500 million years ago.
2. 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.
4. Mode of Nutrition
They utilize all modes of feeding.
Carnivory
Herbivory
Omnivory
Most are herbivorous
Many aquatic antropods are omnivorous.
4
5. Reproduction
most 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
13. 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.
14. 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.
15.
16. 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
17. Mode of Nutrition
Some trilobites were
active predators,
whereas others were
scavengers, and still
others probably
ate plankton.
20. 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.