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The subdivisions of crustacean antennae have many names, including flagellomeres (a shared term with insects), annuli, articles, and segments. The terminal ends of crustacean antennae have two major categorizations: segmented and flagellate.
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.
Shrimp is characteristically used to refer to those crustaceans with long antennae, slender legs, and a laterally compressed, muscular abdomen that is highly adapted for both forward swimming and a backward (retrograde) escape response. Prawn is often used as a synonym of shrimp for penaeoidean and caridean shrimp, especially those of large size.
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 ...
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 ...
Because in Fuxianhuia the antennae lie anterior to the great appendages, they suggest that these antennae are the inherited primitive "primary" antennae; and that the great appendages are thus equivalent to the first antennae of crustaceans. Because the secondary antennae are not present in stem group arthropods such as Fuxianhuia, nor in the ...
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]