Hippolytidae

Distinguished from related shrimp families by a combination of morphological characters including rostrum structure, carapace features, and pleopod morphology. The common name 'broken-back shrimp' refers to a characteristic body posture or carapace shape, particularly notable in the genus Hippolyte. Former members now in Lysmatidae and Thoridae were historically confused with Hippolytidae; these families are now recognized as distinct based on molecular and morphological data.

Marine environments; primarily coastal and continental shelf waters. Documented from tropical to temperate regions including Santa Marta Bay (Colombia), Young Island Channel (Saint Vincent, Lesser Antilles), British Columbia, California, and Baja California.

Widespread in marine waters of the Atlantic and Pacific Oceans. Records include: Caribbean Sea (Colombia, Saint Vincent, Mexico), eastern Pacific (British Columbia to Baja California), and northeastern Atlantic (Denmark, Norway, Sweden).

• fish - cleaning symbiosisDiurnal Hippolytidae species clean mouth and gill cavities; nocturnal species clean external body surfaces. Fish clients show distinct poses suggesting tactile recognition of cleaner stimuli.

Cleaning symbiosis with fish is the best-documented behavior. Diurnal cleaners preferentially clean mouth and gill regions of fish clients, while nocturnal cleaners focus on external body surfaces. Fish hosts appear to distinguish between diurnal and nocturnal cleaners through tactile cues, adopting different poses accordingly. Some species associate with sea anemones.

Fish-cleaning symbiosis provides parasite removal and hygiene services to fish clients. The family contributes to marine biodiversity as both free-living and symbiotic components of coastal ecosystems.

Some species are popular in the marine aquarium trade, particularly those with cleaning behaviors. The common name 'cleaner shrimp' drives demand, though this term is sometimes applied exclusively to Lysmata amboinensis (now in family Lysmatidae).

• LysmatidaeFormerly included in Hippolytidae; distinguished by molecular and morphological characters. Contains popular aquarium 'cleaner shrimp' including Lysmata amboinensis.
• ThoridaeFormerly included in Hippolytidae; now recognized as separate family. Contains species such as Thor floridanus.
• BythocariidaeFormerly included in Hippolytidae; transferred based on revised family circumscription.
• MerguiidaeFormerly included in Hippolytidae; now separate family based on phylogenetic revision.

The term 'cleaner shrimp' is sometimes applied exclusively to Lysmata amboinensis, which is no longer in Hippolytidae but in family Lysmatidae. Similarly, 'broken-back shrimp' specifically refers to genus Hippolyte rather than the entire family. Historical literature may use 'Hippolytidae' to include taxa now placed in four other families.

• cleaner shrimp
• broken-back shrimp
• marine
• caridea
• symbiosis
• cleaning symbiosis
• revised taxonomy 2023
• fish association
• diurnal
• nocturnal
• coastal
• Crustacea
• Decapoda
• Alpheoidea

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Heptacarpus Pictus (Stimpson) Synonymized With Heptacarpus Sitchensis (Brandt) (Decapoda, Hippolytidae)
• Relationships of the branchial parasite Bopyrinella thorii (Isopoda, Bopyridae) and its host Thor floridanus (Decapoda, Hippolytidae)
• ASPECTOS ETOLOGICOS Y ECOLOGICOS DE CAMARONES LIMPIADORES DE PECES (Natantia: Palaemonidae, Hippolytidae, Stenopodidae).
• Changes in Secondary Sexual Characters of Males of Thor Floridanus (Decapoda, Hippolytidae), Infested by Bopyrinella Thorii (Isopoda, Bopyridae)