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The decapod (crustaceans such as a crab, lobster, shrimp or prawn) is made up of 20 body segments grouped into two main body parts: the cephalothorax and the pleon (). [1] [2] Each segment may possess one pair of appendages, although in various groups these may be reduced or missing.
Functions may variously include sensing touch, air motion, heat, vibration (sound), and especially smell or taste. [1] [2] Antennae are sometimes modified for other purposes, such as mating, brooding, swimming, and even anchoring the arthropod to a substrate. [2] Larval arthropods have antennae that differ from those of the adult.
Diptera setae are bristles present throughout the body and function as mechanoreceptors. Crustaceans have mechano- and chemosensory setae. [3] Setae are especially present on the mouthparts of crustaceans [3] and can also be found on grooming limbs. [4] In some cases, setae are modified into scale like structures. [4]
Somite 2 has a pair of pedipalps that in most sub-groups perform sensory functions, while the remaining four cephalothorax segments (somite 4 to 6) have pairs of legs. [10] In basal forms the ocular somite has a pair of compound eyes on the sides and four pigment-cup ocelli ("little eyes") in the middle. [ 12 ]
Setapedites translates to "foot with setae" and derives from the characteristic setae of the outer endopod segments. The specific name abundantis translates to "abundant", referring to how common the genus is within the Fezouata Formation.
Filter feeding crustaceans have setae on modified appendages that act as filters. Filter feeding may have developed in association with swimming, with early morphological adaptations occurring on the appendages of the body trunk. Subsequent adaptations appear to have favored forward filtering appendages.
Squat lobster mating was shown to be unrelated to the female molt period, unlike many other crustacean species; instead, mating occurs when most females are found to be ovigerous and there is no or only minor molting activity, i.e the intermolt period. [12]
Munida rugosa, commonly known as the rugose squat lobster or plated lobster, is a species of decapod crustacean found in the north east Atlantic Ocean and the Mediterranean Sea. Taxonomy [ edit ]