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A swimmeret is many legs on the ventral side of a crayfish used for skilled swimming. The male uses it to carry eggs to the female crayfish.
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How would arthopods move?
Arthropod mobility depends on appendage adaptations for the type of habitat of the species; all of them have jointed legs of some type, used for walking or perching. Many have wings (e.g., class Insecta), and some have swimmeretes or limbs adapted for water movement (shrimp, krill, some crabs). In some crustaceans, walking legs (-peds) have combined functions as pincers (chela) called chelipeds. Most insects have six legs, arachnids have eight, many crustaceans have ten; and in the case of myriapods like millipedes, they might have several hundred.
How many joints are in a crayfish's leg?
No - or, not "only" six. Lobsters belong to the order Decapoda (literally, 'ten feet'), an order of crustaceans within the class Malacostraca. Remember that the "legs" may have significant specialization and not necessarily resemble a process that the organism uses for walking - such as swimmeretes, or front claws; in this case it might seem the lobster has four pairs of legs for walking (pereiopods) and one pair for grasping and manipulating (chelipeds).
What is the locomotion in arthropods?
By walking, flying, swimming. Just about any method you can think of. As the largest phylum in the animal kingdom arthropods include crustaceans, Insects and arachnids. Most walk, but certain species can swim, hop, fly and even wiggle in some larval stages. Some species of spider are even transported by the wind using silk as a parachute
