Monotypic animal orders

Ricinulei is a small order of arachnids. Like most arachnids, they are predatory; eating small arthropods. They occur today in west-central Africa (Ricinoides) and the Americas (Cryptocellus and Pseudocellus) from Brazil to southern Texas, where they inhabit either leaf-litter or caves. As of 2022, 103 extant species of ricinuleids have been described worldwide, all in the single family Ricinoididae. Due to their obscurity they do not have a proper common-name, though in academic literature they are occasionally referred to as hooded tickspiders.

REDIRECT Minchinellidae

REDIRECT Cestidae

REDIRECT Beroidae

REDIRECT Benthopectinidae

Pedinoida is an order of sea urchins, containing the family Pedinidae with a single living genus, Caenopedina. The group was much more diverse during the Mesozoic, and represents the oldest surviving order of euechinoid sea urchins.

REDIRECT Salp

REDIRECT Desmoscolecoidea

REDIRECT Apororhynchus

REDIRECT Thalassocalyce

REDIRECT Polymastiidae

REDIRECT Ganesha (ctenophore)

REDIRECT Limidae

REDIRECT Moniliformidae

REDIRECT Cambodgia

REDIRECT Gastrochaenidae