Phylum-Arthropoda (general characters)

 👉phylum- Arthropoda🦞🦐🦐🦀🦋🦗🦂

👉Gereral Characteristics of Phylum Arthropoda👇👇👇👇

1 Arthros; Jointed, podos; Foot)

2 Kingdom: Animalia

3 Habitat: mostly terrestrial, also aquatic

4 Insects are the most successful life form on the planet: they make up more than half of all living things on Earth

5 Body has Three-part: head, thorax, abdomen.

6 Body is metamerically segmented

7 Three pairs of jointed legs (6 legs).

8 Compound eyes which contain several thousand lenses leading to a larger field of vision.

9 They possess two antenna.

10 Symmetry: bilateral

11 Germ layer: triploblastic

12 Grade of organization: organ system grade

13 Coelom: hoemocoel

14 Chitinous (hard) exoskeleton, no bones or a skeleton

15 Respiratory system: by general body surface, by gills, tracheae or book lungs

16 Circulatory system: open type with dorsal heart.

17 Excretion: malpighian tubules or green gland

18 Nervous system: dorsal brain with ventral nerve cord

19 Sexes are separate. Sexually dimorphism is present

20 Fertilization: internal.

21 Development: direct or indirect with larval stages.

Eg.- Aramea (Spider), Palamnaeus (Scorpion), Limulus (King Crab),Julus (Millipede), Scolopendra (Centipede), SpirobolusPieris (Butterfly), Periplaneta (Cockroach), Tabernus (Housefly), Mosquiotes, Ants, Cancer (crab), Palaemon (Prawn), Daphnia (water flea) 

Type of arthropoda 

A large majority of arthropods belong to the three main groups:

• Insects

• Arachnids

• Crustaceans

Insects (Subphylum Hexapoda)

Since there are three-quarters of a million insect species, it's best to just look at some of the common ones. They include:

• Ants

• Aphids

• Beetles

• Butterflies

• Cicadas

• Cockroaches

• Dragonflies

• Fleas

• Flies

• Grasshoppers

• Leaf hoppers

• Lice

• Mayflies

• Praying mantis

• Stink bugs

• Silverfishes

• Termites

• Walking sticks

All insects have six legs which are arranged in pairs. They also have two antennae and most of them have two compound eyes. Typically you will find two pairs of wings on insects, with some of them having only one pair, like flies. A few insects have no wings, like ants, fleas, and lice. Insects are the only invertebrates that can fly.

Arachnids(Subphylum Chelicerata)

 three main orders of arachnids are:

• Scorpionida (scorpions)

• Acarina (ticks and mites)

• Araneae (spiders)

There are over 100,000 species of arachnids. Common ones include:

• Black widow spider

• Brown recluse

• Chiggers

• Crab spiders

• Daddy longlegs

• Harvestmen

• Mites

• Orb weavers

• Scorpions

• Spiders

• Ticks

• Vinegaroons

• Whip tailed scorpions

• Wind scorpions

Arachnids are eight-legged arthropods with no wings or antennae. Most arachnids live on land; but, a few species can be found in fresh and salt water habitats.

Crustaceans (Subphylum Crustacea)

The number of species of crustaceans is over 40,000. Some of the common ones include:

• Barnacles

• Brine shrimp

• Crabs

• Crayfish

• Fish

• Lice

• Horseshoe shrimp

• Krill

• Lobsters

• Seed shrimp

• Shrimp

All crustaceans have ten legs or more and most of them are found living in water. The majority of aquatic crustaceans live in salt water; but, a few live in lakes and rivers. Woodlice are one of the small numbers of crustaceans who live on land.