Download This diagram shows all the Levels of Classification in biology.

THE PHYLUM ARTHROPODA
(TASK 12) 4 POINTS
Connor Wright
The Phylum Arthropoda (Task 12) Slide 1
WHAT IS THE PHYLUM
ARTHROPODA?
In biology, phylum is a taxonomic rank. There are 9 Levels of Classification
that sort all living things. The phylum groups together all the classes of
organisms that have the same body plan.
Being an arthropod means that you are apart of the phylum Arthropoda.
Arthropods don’t have a spine (they have external skeletons). They also have
a segmented body and jointed appendages. Appendages are like wings or
limbs.
This diagram shows all the
Levels of Classification in
biology.
Connor Wright
The Phylum Arthropoda (Task 12) Slide 2
THE CLASSES WITHIN THE PHYLUM
The classes within the phylum Arthropoda:
•
Arachnida
•
Chilopoda
•
Diplopoda
•
Crustacea
•
Epiclass Hexapoda
•
Entognatha
•
Insecta
Connor Wright
This crab is apart of the Crustacea
class in the phylum Arthropoda.
The Phylum Arthropoda (Task 12) Slide 3
DESCRIBE EACH CLASS IN WORDS
AND PICTURES
Arachnida
In the class Arachnida, there are four orders in the class. There are the orders Araneae, Acari,
Opiliones and Scorpiones.
Araneae consists of spiders. They have two body regions(the cephalothorax and the abdomen).
They also have fangs with venom glands, most of them make webs and have poor eye sight but
compensate with special eyes that do the same as eyes.
Acari is the mite species. They only have one noticeable body region. When the mites are babies,
most of them are microscopic and some are close to it.
Opiliones are like the daddy long legs: they are common, some of them are predators, most are
harmless and commonly encountered.
Scorpiones is the scorpion order. They are venomous, they have long tails ending in a stinger and
they are the nocturnal predators of some animals.
Connor Wright
The Phylum Arthropoda (Task 12) Slide 4
Chilipoda
Chillipoda’s common species is the centipede. They have many body segments and one pair of
legs per body segment. They also have one pair of antennae. Their1st pair of legs are modified
so that they are venomous fangs. Centipedes are predators.
An Australian centipede.
Diplopoda
Diplopoda’s common species is the millipede. The millipede has many body segments. It has two
pairs of legs per body segment and one pair of antennae.
A millipede in some leaf
litter.
Connor Wright
The Phylum Arthropoda (Task 12) Slide 5
Crustacea
Crustacea is commonly made up of crayfish, shrimps and crabs. They have several body regionsthe head, thorax and abdomen. The number of legs they have varies. They have two pairs of
antennae.
A giant lobster.
Epiclass Hexipoda
Organisms that are apart of the Epiclass Hexipoda are special types of insects. There is a certain
type of criteria that establishes whether they are a true insect or whether they are apart of
Epiclass Hexipoda. They have three distinct head regions: thorax, head and abdomen. They must
have one pair of antennae, one pair of mandibles and one pair of Maxilla (two bones that are
fused together along the fissure that forms the upper jaw).
They also must have three pairs of legs on the thorax and a system composed of tubes that have
holes that admit air through the body.
Connor Wright
The Phylum Arthropoda (Task 12) Slide 6
Entognatha
Entognatha means the insect’s mouth is retracted into it’s head. There are three orders in the class
sub-phylum Entognatha: Protura, Collembola and Diplura.
Protura are apart of the apertygota sub-class. An insect that is wingless, small and agile is apart
of the apertygota sub-class. Insects that are apart of Protura don’t metamorphosis. They have no
eyes, no antennae. Adults don’t have wings but their young (nymphs) do. They are detrivores. This
means that they eat decomposing plant matter and faeces, like earthworms.
Collembola, like Protura, is apart of the apertygota sub-class. They don’t metamorphosis. Insects
that are apart of the Collembola order have fork-like springing bodies, simple eyes and
antennae. Adults don’t have wings but their young(nymphs) do. They are also detrivores
Diplura, like Protura and Collembola, is apart of the apertygota sub-class. They don’t
metamorphosis. They have compound eyes and antennae. Adults don’t have wings but their young
(nymphs) do. There is a difference in size between the nymphs and the adults. Like Protura and
Entognatha, insects in Diplura are detrivores.
An example of a detrivore.
Connor Wright
The Phylum Arthropoda (Task 12) Slide 7
Insecta
All insects in Insecta have a exoskeleton, a thorax, head and abdomen, three pairs of jointed
legs, compound eyes and one pair of antennae. They are one of the most diverse animal groups in
the world with there being over a million of the species which makes up half of all known
organisms.
A grasshopper. This insect is apart of
the Insecta class.
Connor Wright
The Phylum Arthropoda (Task 12) Slide 8
WHAT CHARACTERISTICS DO
SCIENTISTS USE TO CLASSIFY THE
CLASSES IN ARTHROPODA?
Scientists use the following information to determine which class in Arthropoda an organism
belongs to. They base it on:
• Body shape and how the organism works
• Size
• Evolution history
• Diet
• Similarities between organisms
• Habitat
• Species it is in
• Whether it metamorphosis or not
Connor Wright
The Phylum Arthropoda (Task 12) Slide 9