PHYLUM ARTHROPODA

PHYLUM ARTHROPODA
Geologic Range: Cambrian - Recent
Kingdom: Animalia
Deriviation of name: "jointed" (arthro) + "foot" (pod).

- Segmented body with a hard exterior skeleton composed of chitin (calcium carbonate) and protein (organic material).

- Paired, jointed legs.

- Highly developed nervous system and sensory organs.
SUB-PHYLUMS AND ITS CLASSES
TRILOBATA
Geologic Range: Precambrian - Permian
- This includes trilobites.

- Its skeleton is composed of chitin, with CaCO3.

- Its body is divided into three lobes: rigid head segment (cephalon), thorax and rigid tail piece (pygidium).
CRUSTACEA
- They are free living aquatic animals, but some are terrestrial and parasitic because of adaptation.

- Its body is divided into three segments: cephalon, thorax, and pleon (abdomen).
CLASS OSTRACODA
Geologic Range: Cambrian - Recent
This includes seed shrimps and alike.
CLASS BRANCHIOPODA
Geologic Range: Devonian - Recent
- This class is small in size (1/8").

- This includes brine shrimps, etc.
CLASS MALACOSTRACA
Geologic Range: Cambrian - Recent
This includes lobsters, crabs, shrimp and alike.
CLASS MAXILLOPODA
Geologic Range: Cambrian - Recent
- This includes barnacles, copepods, fish lice, and alike.

- They often have short bodies, with the abdomen reduced in size, and generally lacking any appendages
CLASS CELAPHALORACIDA
Geologic Range: Unidentified
- No traces of fossils of this class have been found, but scientist believed them to be primitive among crustaceans.

- This class is found by Howard Sanders and regrouped it with Class Remipedia.
CLASS REMIPEDIA
Geologic Range: Pennsylvanian - Recent
This includes blind crustaceans; and commonly found in the ocean basins of explored oceans of Australia, Caribbean Sea and Atlantic.
CHELICERATA
PRESENTED BY:
FORYASEN, KINJO & FRANCISCO, ROBIN
A REPORT IN GEO112P - PALEONTOLOGY
- Like all arthropods, cheliceratas have segmented bodies with jointed limbs, all covered in cuticle made of chitin and proteins.
CLASS ARACHNIDA
Geologic Range: Silurian - Recent
- This includes spiders, scorpions, ticks and mites.

- This class is the most diverse in phylum arthropoda.
CLASS MEROSTOMATA
Geologic Range: Ordovician - Permian (Most are Silurian - Devonian)
- This includes eurypterids and horse shoe crabs.

- Eurypterids are extinct scorpion-like or lobster-like arthropods; predators. Their mode of life: Inhabited brackish estuaries
CLASS PYCNOGONIDA
Geologic Range: Cambrian - Recent
- This includes sea spiders.
-They can be found at the depth of 2000 ft and below.
MYRIAPODA
- Subphylum of arthropods containing millipedes, centipedes, and others. The group contains over 13,000 species, all of which are terrestrial.

- Deriviation: "myriad" meaning 10000 legs, but myriapods has only legs ranging from 750 to fewer than 10.
CLASS CHIPOLODA
Geologic Range: Silurian - Recent
- This includes centipedes.
- Deriviation: Latin prefix "centi" - hundred, and "pes, pedis" - foot.
CLASS DIPLOPODA
Geologic Range: Silurian - Recent
- This includes centipedes.
- Deriviation: Latin prefix "milli"- hundred, and "pes", "pedis" - foot. But the only known specie with maximum legs are with 750 of it.
CLASS PAUROPODA
Geologic Range: Eocene - Recent
They look like centipedes, but they are rather sister group of millipedes.
CLASS SYMPHYLA
Geologic Range: Eocene - Recent
They are also known as garden centipedes.
HEXAPODA
PHYLUM ARTHROPODA
- Constitutes the largest number of species of arthropods

- They are named for their most distinctive feature: a consolidated thorax with three pairs of legs.
CLASS INSECTA
Geologic Range: Devonian - Recent
They constitute a large percentage of arthropods and their population is much larger than the population of human race.
CLASS ENTOGNATHA
Geologic Range: Devonian - Recent
They are classified as wingless insects.
CLASS CAMPTOPHYLLIA
Geologic Range: Moscovanian - Kasimovanian
- Small to average size arthropod of uncertain affiliation, that lived during the Upper Carboniferous in what is today England.

- It has been found exclusively in coal deposits. It is only known from its dorsal exoskeleton.
CLASS MARELLOMORPH
Geologic Range: Cambrian - Devonian
They lacked mineralised hard parts, so are only known from areas of exceptional preservation, limiting their fossil distribution.