Classes of Arthropoda ppt

Classification of Animals
Nonchordates
Phylums
 Protozoa Amoeba
 Porifera Sponge
 Coelenterata Hydra
 Platyhelminthes Planaria
 Nemathelminthes Nematodes
 Annelida Earthworms
 Arthropoda Insects, mites, millipedes
 Mollusca Snails
 Echinodermata Starfish
 Hemichordata Balanoglossus
 Chordata Class (Pieces, Amphibia,
Aves, Reptilia, Mammalia)
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Arthropoda
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 Segmented body is divided into head, thorax and abdomen.
Sometimes head and thorax are united together to form
cephalothorax. Segments grouped into 2 or 3 regions (tagma)
known as Tagmosis.
 Renewable chitinous exoskeleton - a hard protective covering
around the outside of the body (divided by sutures into plates
called sclerite
 Grow by molting. Bilateral symmetry of body. Body cavity filled
with blood and called as haemocoel.
 Tubular alimentary canal with mouth and anus at anterior and
posterior ends. Dorsal heart and Dorsal brain with ventral nerve
cord. No cilia (hair like vibratile structure on the surface of the cell).
 Paired, segmented appendages.
 Insects are invertebrates
grouped in the phylum
Arthropoda and subphylum
Uniramia.
 Arthropoda (from Greek
words arthros = jointed,
podos = foot)

Classification of Arthropoda
7 Classes
 Onychophora (Claw bearing) Peripatus
 Crustacea (crusta-shell) Prawn, Crab, Woodlouse
 Arachnida (Arachine-spider) scorpion, spider, ticks, mites
 Chilopoda (chilo-lip,poda-legs) Centipedes
 Diplopoda (diplo-two,poda-legs) Millipedes
 Trilobita (Extinct group)
 Hexapoda (hexa-Six; poda-legs)
Insecta (in-internal; sect-cut)
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1. Onychophora
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 Gives birth to live young rather than laying eggs
 Nocturnal carnivore (appearance of a caterpillar with its many
pairs of legs, while its structure has many similarities to
arthropods, but it also has many similarities to annelids.
 No external segmentation; the legs are not jointed with
claws. The outer covering is a cuticle, which is covered in
unique microscopic projections known as papillae
 Body is composed of segments like annelids
 Respiration through tracheae. Antennae are present on the
head. Excretion is through nephridia, which are found in each
of the legs

2. Crustacea
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 Mostly aquatic, free living parasites.
 Two body regions – Cephalothorax and
abdomen.
 Pairs of antennae.
 Varied number of legs (usually five).
 Respiration is done by skin or by gills.
 Excretion is done by green glands.

3. Arachnida
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 Terrestrial habitat.
 2 body segments: cephalothorax and abdomen.
 4 pairs of legs, simple eyes.
 Respiration is done by gills or lungs
 No antennae
 It has 4 sub classes:
a) Scorpinida: E.g. Scorpion
b)Phalangida: E.g. Harvest man or
c) Araneida; E.g. Spiders
d) Acarina: E.g. Ticks and Mites.

4. Chilopoda
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 Chilopods are quick moving predators with
poison glands
 Terrestrial in habitat, body is long, flattened
and multi-segmented.
 1 pair of legs per body segment.
 1 pair of antennae.
 1st pair of legs modified into venomous
“fangs”
 Animals are unisexual.

5. Diplopoda
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 But their body is rounded and the segments
are internally fused in twos.
 The antennae are short and there are no
poison claws.
 The reproductive organs open on anterior
end of the body close to the head.
 They generally feed on decaying vegetable
matters.
 Generally have two pairs of legs on each
body segment, are nonpoisonous, move
slowly and generally feed on soil, bacteria
and fungi.

6. Insecta / Hexapoda
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 Body divided in to head, thorax and abdomen. Three pairs
of legs, one or two pairs of wings
 A pair of antennae and one pair of compound eyes with a
variable number of simple eyes or ocelli.
 Respiration by trachea. Excretion by malpighian tubules.
 Genital opening situated at the posterior end of the body.
The females generally lays eggs and the young that hatch
are different from the adults in body form.
 Development by metamorphosis (incomplete/complete).
 Possess exoskeleton made up of hard cuticle.

Classes of Arthropoda ppt

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Classes of Arthropoda ppt