Nematocarcinoidea is a superfamily of shrimp, comprising four families – Eugonatonotidae, Nematocarcinidae, Rhynchocinetidae and Xiphocarididae. They share the presence of strap-like epipods on at least the first three pairs of pereiopods, and a blunt molar process.

Nematocarcinoidea. Retrieved November, 05 2021, from en.wikipedia.org/wiki/Nematocarcinoidea.

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.

Rhynchocinetidae. Retrieved November, 05 2021, from en.wikipedia.org/wiki/Rhynchocinetidae.