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What are the 4 major lineages of arthropods?

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What are the 4 major lineages of arthropods?

Today, there are four main lineages of arthropods: Hexapoda (insects), Myriapoda (centipedes, millipedes, and relatives), Crustacea (shrimps, crabs, lobsters, cray- fish, barnacles, etc.), and Chelicerata (sea spiders, horse- shoe crabs, and arachnids).

What are 4 examples of arthropods?

Within the above categories, there are four basic types of arthropods.

  • insects.
  • arachnids.
  • crustaceans.
  • myriapods.

What are the families of arthropods?

The following families of organisms are all examples of arthropods:

  • Insects such as ants, dragonflies, and bees.
  • Arachnids such as spiders and scorpions.
  • Myriapods (a term which means “many feet”) such as centipedes and milipedes.
  • Crustaceans such as crabs, lobsters, and shrimp.

What are the four main characteristics of arthropods?

Characteristics of arthropods include:

  • A segmented body (Figure below) with a head, a thorax, and abdomen segments.
  • Appendages on at least one segment.
  • A nervous system.
  • A hard exoskeleton made of chitin, which gives them physical protection and resistance to drying out.

What are the 5 groups of arthropods?

Arthropods are traditionally divided into 5 subphyla: Trilobitomorpha (Trilobites), Chelicerata, Crustacea, Myriapoda, and Hexapoda. Myriapoda is divided into four classes: Chilopoda (centipedes), Diplopoda (millipedes), Pauropoda, and Symphyla.

What are the 3 segments of arthropods?

Arthropod segments have also fused together into functional units called tagma. This process of segment fusion, or tagmosis, usually results in an arthropod body that consists of three major sections, a head, thorax, and abdomen. Sometimes the head and thorax are fused together into a cephalothorax.

Which arthropods have 4 pairs of legs?

Scorpions are relatively large arachnids. Like other arachnids, their body consists of a cephalothorax, which bears the mouthparts and legs, and an abdomen. They are characterized by having four pairs of legs, large clawlike pedipalps, and a five-segmented abdomen with a sting on the distal end.

What are 5 characteristics of Arthropoda?

5 Characteristics of an Arthropod

  • Exoskeleton. Arthropods are invertebrates, which means their bodies do not have internal bones for support.
  • Segmented Bodies. Arthropods have bodies that are internally and externally segmented.
  • Jointed Appendages.
  • Bilateral Symmetry.
  • Open Circulatory System.

What are 2 characteristics of arthropods?

All arthropods share these characteristics:

  • Exoskeleton. An exoskeleton is the supporting structure on the outside of the body of an arthropod.
  • Segmented bodies.
  • Jointed appendages such as mouthparts and antennae.
  • Bilateral symmetry.
  • Dorsal blood vessel.
  • Ventral nerve cord.

What are the characters of Arthropoda?

The important characteristics of arthropoda include:

  • They possess an exoskeleton.
  • They have jointed appendages.
  • Their body is segmented.
  • They are bilaterally symmetrical.
  • They possess an open circulatory system.

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