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There are several notable non-sensory uses of antennae in crustaceans. Many crustaceans have a mobile larval stage called a nauplius, which is characterized by its use of antennae for swimming. Barnacles, a highly modified crustacean, use their antennae to attach to rocks and other surfaces. [2]
Crustacean appendages are typically biramous, meaning they are divided into two parts; this includes the second pair of antennae, but not the first, which is usually uniramous, the exception being in the Class Malacostraca where the antennules may be generally biramous or even triramous.
Isopoda is an order of crustaceans.Members of this group are called isopods and include both aquatic species and terrestrial species such as woodlice.All have rigid, segmented exoskeletons, two pairs of antennae, seven pairs of jointed limbs on the thorax, and five pairs of branching appendages on the abdomen that are used in respiration.
No eyes have been observed in either the adult or larval stages, presumably because of their muddy natural habitat. The second pair of antennae is located behind the mouth; in all other crustaceans the antennae are in front of the mouth at the adult stage, and only their larvae have antennae that have the same location as adult cephalocaridans ...
Emerita is a small genus of decapod crustaceans, [3] known as mole crabs, sand fiddlers, sand fleas or sand crabs. These small animals burrow in the sand in the swash zone and use their antennae for filter feeding. [4] [5]
Previous research has hinted at the likelihood of crustaceans feeling pain when subjected to mechanical impact, electric shocks or noxious acids touching their soft tissues such as the antennae.
Dieter Waloszek and colleagues have offered a rather different account [33] of Cambrian arthropod head structure. They do not necessarily accept the primary antenna theory of the onychophoran antennae; and they reject the idea that Fuxianhuia or any of its close relatives possessed a great appendage. Rather, they place the "great appendage ...
The exopodites can sometimes be missing in some crustacean groups (amphipods and isopods), and they are completely absent in insects. [5] The legs of insects and myriapods are uniramous. In crustaceans, the first antennae are uniramous, but the second antennae are biramous, as are the legs in most species.