ArthropodaArthropoda

By: Alexis Mamparo By: Alexis Mamparo

and and

Kelsey CollinsKelsey Collins

Quick FactsQuick Facts

No cell wallNo cell wall

Kingdom:Kingdom: AnimaliaAnimalia

Phylum:Phylum: ArthropodaArthropoda

Reproductive Mechanism:Reproductive Mechanism: sexual sexual reproduction, internal fertilizationreproduction, internal fertilization

MulticellularMulticellular

““Arthropoda” means “jointed foot”Arthropoda” means “jointed foot”

Feeding MechanismFeeding Mechanism

HeterotrophHeterotroph– Chelipeds or pedipalps capture food Chelipeds or pedipalps capture food – Mandibles chew foodMandibles chew food– Maxillae manipulate foodMaxillae manipulate food

Some arthropods like the crawfish have a Some arthropods like the crawfish have a stomach with chitin (teeth) to digest food.stomach with chitin (teeth) to digest food.

SubgroupsSubgroups

TrilobitesTrilobites extinct in the extinct in the Late Devonian extinctionLate Devonian extinction. . CheliceratesChelicerates include include spidersspiders, , mitesmites, , scorpionsscorpions and and related organisms. They are characterised by the related organisms. They are characterised by the presence of presence of cheliceraechelicerae, appendages just above / in front , appendages just above / in front of the mouth. Chelicerae appear in scorpions as tiny of the mouth. Chelicerae appear in scorpions as tiny claws that they use in feedingclaws that they use in feedingMyriapodsMyriapods ( (millipedesmillipedes, , centipedescentipedes) and their relatives ) and their relatives and have many body segments, each bearing one or and have many body segments, each bearing one or two pairs of legs. They are sometimes grouped with the two pairs of legs. They are sometimes grouped with the hexapods. hexapods. HexapodsHexapods ( (insectsinsects) three small orders of insect-like ) three small orders of insect-like animals with six thoracic legs. animals with six thoracic legs. CrustaceansCrustaceans are primarily aquatic and are characterised are primarily aquatic and are characterised by having biramous appendages. ( lobsters, crabs, by having biramous appendages. ( lobsters, crabs, barnacles, crayfish, shrimp)barnacles, crayfish, shrimp)

Distinguishing Distinguishing Characteristics/ComparisonCharacteristics/Comparison

Segmented bodySegmented body

Exoskeleton made of chitinExoskeleton made of chitin

Jointed limbsJointed limbs

Specialized mouth partsSpecialized mouth parts

Compound eyesCompound eyes

Examples of MembersExamples of Members

ArachnidsArachnids (scorpions, spiders, ticks) (scorpions, spiders, ticks)– have 8 legs,simple eyes, no wings, no antennae, no have 8 legs,simple eyes, no wings, no antennae, no

mandibles, cephalothorax & abdomen.mandibles, cephalothorax & abdomen.

InsectsInsects (butterflies, beetles, bees) (butterflies, beetles, bees)– have 6 legs, compound eyes, wings, one pair of have 6 legs, compound eyes, wings, one pair of

antennae, mandibles, head, thorax, and abdomen.antennae, mandibles, head, thorax, and abdomen.

CrustaceansCrustaceans (shrimp, crabs, snowbugs) (shrimp, crabs, snowbugs)– have 8+ legs, compound eyes, no wings, 2 pairs of have 8+ legs, compound eyes, no wings, 2 pairs of

antennae, and mandibles.antennae, and mandibles.

(Animal group facts)(Animal group facts)

ProtostomeProtostomeBilateralBilateral body symmetry body symmetryCirculatory System:Circulatory System: open, no blood vessels, open, no blood vessels, tubular dorsal blood vesseltubular dorsal blood vesselNervous System:Nervous System: Nerve cord linked to ganglia Nerve cord linked to ganglia throughout body, nerve ring surrounds pharynxthroughout body, nerve ring surrounds pharynxExcretion:Excretion: – Maliphigian tubules- Maliphigian tubules- hollow projections of digestive hollow projections of digestive

tract that collect waste and fluid.tract that collect waste and fluid. – Coxal glands- Coxal glands- remove wastes and discharge them remove wastes and discharge them

from the base of the legs. from the base of the legs.