Crustacea etymology

Etymology:

The word "Crustacea" is derived from the Latin word "crusta," which means "shell" or "crust."

Meaning:

Crustacea is a class of arthropods that includes animals such as crabs, lobsters, crayfish, barnacles, and shrimp. They are characterized by their hard exoskeletons (shells), which are made of a substance called chitin.

Origin:

The earliest known crustaceans appeared in the oceans during the Cambrian period, around 541 million years ago. They are believed to have evolved from free-swimming ancestors that gradually developed hard exoskeletons for protection.

Key Characteristics:

• Hard exoskeleton made of chitin
• Jointed appendages used for feeding, locomotion, and reproduction
• Two pairs of antennae
• Compound eyes
• Gills for respiration

Classification:

Crustacea is a diverse class of arthropods, with over 50,000 known species. It includes the following subclasses:

• Branchiopoda (water fleas, fairy shrimp)
• Cephalocarida (horsehair worms)
• Malacostraca (crabs, lobsters, shrimp)
• Remipedia (blind cave shrimp)
• Maxillopoda (barnacles, copepods)
• Ostracoda (seed shrimp)

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