EVERYDAY SCIENCE

Detailed explanation-1: -The phylum Arthropoda is commonly divided into four subphyla of extant forms: Chelicerata (arachnids), Crustacea (crustaceans), Hexapoda (insects and springtails), and Myriapoda (millipedes and centipedes).

Detailed explanation-2: -Insects and arachnids are both arthropods-invertebrate animals with exoskeletons (that they shed, or molt, to grow), segmented bodies, and paired jointed limbs.

Detailed explanation-3: -The phylum Arthropoda contains a wide diversity of animals with hard exoskeletons and jointed appendages. 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.

Detailed explanation-4: -The Arthropoda includes insects and crustaceans. Only two groups of arthropods are common as fossils in the Cretaceous of the C&D Canal area, and both are types of crustaceans: the Malacostraca (crabs, lobsters, and shrimp) and the microscopic Ostracoda.

Detailed explanation-5: -insects; myriapods (including centipedes and millipedes); arachnids (including spiders, mites and scorpions); crustaceans (including slaters, prawn and crabs).