Malacostraca families

Mysidae is the largest family of crustaceans in the order Mysida, with over 1000 species in around 170 genera.

Squillidae is a family of mantis shrimp, the only family in the superfamily Squilloidea. The type genus is Squilla. It is the stomatopod family with the most genera, as follows:

Nebaliidae is the largest of the three families of leptostracan crustaceans, containing 33 of the 40 described species. Its members may be distinguished from members of the other two families by the tapering form of the caudal furcae (which is broader in Nebaliopsididae), and by the callynophores of the antennae in mature males, which are swollen in Paranebaliidae but not in Nebaliidae.

Gonodactylidae is a family of mantis shrimp. It contains these genera: Gonodactylaceus Manning, 1995 Gonodactylellus Manning, 1995 Gonodactyloideus Manning, 1984 Gonodactylolus Manning, 1970 Gonodactylopsis Manning, 1969 Gonodactylus Berthold, 1827 Hoplosquilla Holthuis, 1964 Hoplosquilloides Manning, 1978c Neogonodactylus Manning, 1995

Bodotriidae is a family of crustaceans belonging to the order Cumacea. Bodotriids have a worldwide distribution in shallow and deep waters. There are over 380 described species in over 30 genera, being the most diverse cumacean family. Their external morphology differs from other cumaceans by a combination of traits that independently are not unique to the family: the telson is fused to the last abdominal segment (last pleonite), the dorsal part of the mandible has a boat shape (naviculoid), exopods exist on the third maxilliped and the first peraeopod, and there is a uropodal endopod with one

thumb|left|Parasquilla haani painted by [[Kawahara Keiga in the period 1823 - 1829. Siebold Collection.]] Parasquillidae is a family of mantis shrimp containing the three genera Faughnia, Parasquilla and Pseudosquillopsis. It was previously included in the superfamily Gonodactyloidea, but that group was found to be paraphyletic, and a new superfamily, Parasquilloidea was erected.

Bathynellidae is a family of crustaceans belonging to the order Bathynellacea, first described by Karl Grobben in 1905.

Lampropidae is a family of cold-water crustaceans belonging to the order Cumacea. Members of Lampropidae are relatively easily recognised because they all at have at least three terminal setae on the telson (rigid fibres on the end of the tail). The telson is medium to large and not fused with the last segment of the pleon. The endopods (interior branches) of the uropods are present on all three members. In the males the flagellum of the second antenna reaches beyond the carapace; moreover, they possess pleopods. In the females the second antenna is somewhat shorter than the first. There are e

Leuconidae is a family of marine hooded shrimp (order Cumacea). The family was established by Georg Ossian Sars in his 1878 study of Mediterranean cumaceans.

Pseudocumatidae is a family of crustaceans of the order Cumacea. Its members have a small, free telson. The uropods bear endopods (interior branch) on one segment. The males have two pairs of rather rudimentary pleopods and the flagella of the second antenna reach far beyond the pereon. In females the second antenna is much smaller than the first antenna.

Nannastacidae is a family of crustaceans belonging to the order Cumacea. They have no free telson. The endopods (interior branches) of the uropods are present on one segment. There are exopods (outer branches) on the maxillipeds and generally one on pereopods 1–4 in males and 1–2 in females. In the females the second antenna is much shorter than the first. It contains the following genera:

Petalophthalmidae is a family of marine crustaceans in the order Mysida, the opossum shrimps.

Nannosquillidae is a family of stomatopods, comprising the following genera:

Ceratocumatidae is a family of crustaceans of the order Cumacea. Ceratocumatidae have a small free telson. The endopods (interior branches) of the uropods are present on only one segment. Males have 5, 4 or 3 pairs of pleopods. All maxillipeds and some of the pereiopods bear exopods (outer branches). The gill apparatus has no supporting gill plates.

Parabathynellidae is a family of crustaceans belonging to the order Bathynellacea. These creatures are characterized by their slender bodies, reduced eyes, and elongated antennae. They are typically less than 1 mm in length, making them difficult to observe without the aid of a microscope. Parabathynellidae are found in freshwater habitats around the world, including streams, springs, caves, and aquifers.

The Lysiosquillidae or banded mantis shrimps are a family of mantis shrimp, comprising some of the largest known mantis shrimp species. The most common and best known species is Lysiosquillina maculata, the zebra mantis shrimp.

Diastylidae is one of the eight most commonly recognised families of crustaceans of the order Cumacea. They are marine creatures especially common around the 30th parallel north.

Bathysquillidae is a family of mantis shrimp. It contains two genera and three species. The family was described by Raymond Manning in 1967.

The Pseudosquillidae are a family of mantis shrimp containing four genera and 11 species.

Paratanaidae is a family of crustaceans belonging to the order Tanaidacea.

Lophogastridae is a family of crustaceans belonging to the order Lophogastrida.

Neotanaidae is a family of crustaceans belonging to the order Tanaidacea.

Nototanaidae is a family of crustaceans belonging to the order Tanaidacea.

Eurysquillidae is a family of mantis shrimp. Formerly placed in the superfamily Gonodactyloidea, it has since been recognised that eurysquillids are closer to families in the Squilloidea, and so Eurysquillidae has been placed in its own superfamily, Eurysquilloidea. The family was first described in 1977 by Raymond Manning.

Anarthruridae is a family of crustaceans belonging to the order Tanaidacea.

Koonungidae is a family of crustaceans belonging to the order Anaspidacea.

Nebaliopsididae is a family of leptostracan crustaceans. It contains only two species, the bathypelagic Nebaliopsis typica and the mesopelagic Pseudonebaliopsis atlantica.

Halosbaenidae is a family of crustaceans belonging to the order Thermosbaenacea.

Tetrasquillidae is a family of mantis shrimp containing eleven genera:

Agathotanaidae is a family of crustaceans belonging to the order Tanaidacea.

Gynodiastylidae is one of the eight most commonly recognised families of crustaceans of the order Cumacea. They are especially prevalent in the Southern Hemisphere, with some types described from Japan, Thailand and the Persian Gulf. Most are found at less than depth.

Protosquillidae is a family of mantis shrimp. It contains the following genera: Chorisquilla Manning, 1969 Echinosquilla Manning, 1969 Haptosquilla Manning, 1969 Protosquilla Brooks, 1886 Rayellus Ahyong, 2010 Siamosquilla Naiyanetr, 1989

Stygocarididae is a family of crustaceans belonging to the order Anaspidacea.

Apseudidae is a family of crustaceans belonging to the order Tanaidacea.

Hirsutiidae is a family of crustaceans, classified either as a separate order, Bochusacea, or as part of a wider Mictacea. It comprises five species in three genera: Hirsutia bathyalis Saunders, Hessler & Garner, 1985 Hirsutia saundersetalia Just & Poore, 1988 Thetispelecaris remex Gutu & Iliffe, 1998 Thetispelecaris yurigako Ohtsuka, Hanamura & Kase, 2002 Montucaris distincta Jaume, Boxshall & Bamber, 2006

Leptocheliidae is a family of malacostracans in the order Tanaidacea. There are more than 30 genera and 140 described species in Leptocheliidae.

Takuidae is a family of crustaceans belonging to the order Stomatopoda.

Pagurapseudidae is a family of crustaceans in the order Tanaidacea. Like hermit crabs, they inhabit empty gastropod shells, but can be told apart from hermit crabs by the lack of a carapace, revealing the segmentation of the thorax, and by the greater number of legs: hermit crabs have five pairs of legs, of which the first has large claws, and the last is highly reduced, while in Pagurapseudidae, there is one pair of claws, plus six further walking legs.

Typhlotanaidae is a family of crustaceans belonging to the order Tanaidacea.

Coronididae is a family of crustaceans belonging to the order Stomatopoda.

Psammaspididae is a family of crustaceans belonging to the order Anaspidacea.

Sphyrapodidae is a family of crustaceans belonging to the order Tanaidacea.

Akanthophoreidae is a family of crustaceans belonging to the order Tanaidacea.