The word arthropod is a combination of two Greek words – arthro meaning jointed and pod meaning foot. All arthropods have jointed legs, claws, and body segments! Arthropods have segmented bodies. Each body segment usually has a pair of appendages.
Many of the terms used for arthropod leg segments (called podomeres) are of Latin origin and can be confused with terms for bones: coxa (meaning hip, plural coxae), trochanter, femur (plural femora), tibia (plural tibiae), tarsus (plural tarsi), ischium (plural ischia), metatarsus, carpus, dactylus (meaning fingers), …
Although arthropods grow, their exoskeletons do not grow with them. As such, they must periodically shed, or “skin” their exoskeletons in favor of a new one. Arthropods (“arthro” means joint and “pod” means leg) also have articulated appendages. Lost limbs can be gradually regenerated after successive molts.
Articulated limbs allowed arthropods much greater flexibility and range of motion. Benefits of a hard outer layer include protection, water retention, structural support (especially on land) and resistance to muscle attachment and contraction.
Most arthropods move by means of their segmental appendages, and the exoskeleton and muscles that attach to the inside of the skeleton work together like a lever system, as do vertebrates. The arthropod exoskeleton is a highly efficient small animal system.
Tip: Arthropods have articulated bones and their cuticle consists of chitin, which is also mineralized with calcium carbonate. The body plan of an arthropod consists of segments, each with a pair of appendages.
The word arthropod means “jointed legs”. Insects, spiders, crabs, shrimp, butterflies, centipedes, centipedes and scorpions belong to this phylum. The body plan is clear from the segmentation – head, chest and abdomen.
Arthropods are articulated animals and you must have encountered quite a few of these animals. Some prominent ones are insects, spiders, ants, bees, crabs, shrimp, centipedes, centipedes etc. Scientifically, they all fall under the animal kingdom under the phylum Arthropoda.
The main groups of arthropods are arachnids, centipedes, crustaceans, insects and centipedes. Spiders, mites, ticks and scorpions are arachnids. These arthropods only have two body segments, eight legs but no antennae.
The term “jointed appendages” refers to appendages that have joints. Articulated appendages are characteristics of the phylum Arthropoda. Legs, wings, and mouthparts are examples of arthropod appendages.
All insects have six legs (three pairs of jointed legs) and usually four wings (two pairs).
Definition: Insect Leg: Legs of insects (adults and larvae) are articulated and consist of five parts: hip, trochanter, femur, tibia and tarsus. The plural forms of these words are coxae, trochanters, femora, tibiae, and tarsi. The tarsus is the part furthest from the insect’s body and typically ends in a claw or pair of claws.
Spiders typically have eight walking legs (insects have six). They don’t have antennas; The pair of appendages in front of the legs are the pedipalps (or just palps). Spiders have seven segments in their legs. Starting from the end of the body, these are the coxa, trochanter, femur, patella, tibia, metatarsus and tarsus.
Overview. The lower leg consists of two bones, the tibia and the smaller fibula. The thigh bone or femur is the large thigh bone that connects the lower leg bones (knee joint) to the pelvic bone (hip joint).
Insects only have six legs. Spiders, scorpions, mites, ticks, whippersnakes, and pseudoscorpions are all arachnids found in Everglades National Park. Unlike insects, arachnids have eight legs and no antennae, and their body is divided into two main segments: a cephalothorax and an abdomen.