Crustacean | Definition, Characteristics, Evolution, & Facts | Britannica
2024年9月24日 · crustacean, any member of the subphylum Crustacea (phylum Arthropoda), a group of invertebrate animals consisting of some 45,000 species distributed worldwide. Crabs, lobsters, shrimps, and wood lice are among the best-known crustaceans, but the group also includes an enormous variety of other forms without popular names.
Characteristics of crustaceans | Britannica
crustacean , Any member of the 45,000 arthropod species in the subphylum Crustacea. Distributed worldwide, crustaceans are distinguished by having two pairs of antenna-like appendages in front of the mouth and other paired appendages near the mouth that act like jaws.
Crustacean - Anatomy, Adaptations, Diversity | Britannica
2024年9月24日 · National Center for Biotechnology Information - PubMed Central - Terrestrial crustaceans (Arthropoda, Crustacea): taxonomic diversity, terrestrial adaptations, and ecological functions; Cell - Crustaceans
list of crustaceans - Encyclopedia Britannica
This is a list of significant crustaceans, which are members of the subphylum Crustacea. They are grouped taxonomically by class, with notable members of each class ordered alphabetically. (See also invertebrate; shellfish.) class Branchiopoda
Crustacean - Aquatic, Arthropod, Exoskeleton | Britannica
2024年9月24日 · The Crustacea as a whole shows great variation in the number of somites and the amount of fusion that has taken place. In the class Malacostraca , which includes the decapods, there is a consistent body plan: the trunk (which follows the head) is divided into two distinct regions, an anterior thorax of eight somites and a posterior abdomen of ...
Malacostracan | Definition, Characteristics, Examples, Classification ...
malacostracan, any member of the more than 29,000 species of the class Malacostraca (subphylum Crustacea, phylum Arthropoda), a widely distributed group of marine, freshwater, and terrestrial invertebrates. Lobsters, crabs, hermit crabs, shrimp, and …
Crustacean - Evolution, Paleontology, Adaptations | Britannica
2024年9月24日 · In classifying the Crustacea, a variety of characters are important: the form and extent of the carapace, if present; the number of trunk somites, or segments, and how many fuse with the head or with the telson; the number and degree of specialization of the trunk limbs; the presence or absence of paired eyes and of a caudal furca—i.e., a ...
Crustaceans Portal | Britannica
Crustaceans are a group of invertebrate animals consisting of some 45,000 species worldwide. Crabs, lobsters, and shrimps are all counted among the subphylum Crustacea. Crustaceans are found primarily in water, as noted by Sebastian the crab in Disney’s “The Little Mermaid” (1989).
crustacean - Kids | Britannica Kids | Homework Help
Crustaceans are animals that usually have a hard covering, or exoskeleton, and two pairs of antennas, or feelers.People around the world eat many types of crustacean—for example, crabs, lobsters, shrimps (or prawns), and crayfish. Barnacles, water fleas, and pill …
Decapod | Anatomy, Classification & Adaptations | Britannica
Decapod, (order Decapoda), any of more than 8,000 species of crustaceans (phylum Arthropoda) that include shrimp, lobsters, crayfish, hermit crabs, and crabs. The presence of five pairs of thoracic legs (pereiopods) is the basis for the name decapod (from the …