Rhynchocinetidae

The family Rhynchocinetidae are a group of small, reclusive red-and-white shrimp. This family typically has an upward-hinged foldable rostrum, hence its taxon name Rhynchocinetidae, which means movable beak; this gives these shrimps their common name of hinge-beak shrimps. The family contains only two genera, Cinetorhynchus and Rhynchocinetes.

==Taxonomy== Rhynchocinetidae has historically been considered to include the single genus Rhynchocinetes, which was subdivided into two sub-genera. However, in 1995, Holthuis elevated the subgenus Cinetorhynchus to full generic status based on morphology. Members of Rhynchocinetes have two acute teeth on the central carina of the carapace, a supraorbital spine and no spine on the margins of the fourth and fifth abdominal somites. Cinetorhynchus differs in having three teeth on the carapace, no supraorbital spine and a single spine each on the margins of the fourth and fifth abdominal somites.