GENERAL HISTOLOGY

Detailed explanation-1: -Crustaceans are named after the Latin word crusta, which means “shell.” Crustaceans are a complex group of invertebrates that includes active animals like crabs, lobsters, shrimp, krill, copepods, amphipods, and barnacles, as well as more sessile species like barnacles.

Detailed explanation-2: -Many familiar species belong to the phylum Arthropoda-insects, spiders, scorpions, centipedes, and millipedes on land; crabs, crayfish, shrimp, lobsters, and barnacles in water (Fig. 3.72). Arthropods are considered the most successful animals on Earth.

Detailed explanation-3: -The land forms of arthropods include scorpions, spiders, and most insects while the marine forms are divided into three distinct groups – Horseshoe crabs, Sea Spiders, and Crustaceans.

Detailed explanation-4: -insects; myriapods (including centipedes and millipedes); arachnids (including spiders, mites and scorpions); crustaceans (including slaters, prawn and crabs).