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(invertebrate zoology)
A subclass of Crustacea erected to include the primitive crustacean Hutchinsoniella macracantha.



a subclass of small primitive crustaceans. The body is elongate, measuring as much as 3 mm in length. It consists of a head, a ten-segmented thorax with legs, and a nine-segmented legless abdomen. At the end of the body is a ramus with two long bristles. The legs are used for locomotion and respiration, as well as for directing food toward the mouth opening. There are two pairs of antennae on the head, small upper jaws, and two pairs of lower jaws, which are practically indistinguishable from the thoracic limbs. The animals lack eyes, a condition related to their burrowing way of life. The female lays eggs into an egg sac located on the last segment of the thorax. Nauplii are hatched from the eggs and become adults only after 18 molts.

The subclass Cephalocarida was discovered in 1957. Its first identified representative, Hutchinsoniella macracantha, was found on the Atlantic coast of the USA. Other species have been found on the eastern and western coasts of North America and near Japan. Three genera, embracing four silt-dwelling species, are known.


Zhizn’ zhivotnykh, vol. 2. Moscow, 1968.
Dogel’, V. A. Zoologiia bespozvonochnykh, 6th ed. Moscow, 1975.


References in periodicals archive ?
Biologia reproductiva durante un ciclo anual de la lagartija vivipara Mabuya brachypoda (Reptilia: Scincidae) del estado de Tabasco, Mexico (Tesis de Maestria).
Dimeric flavonoids from Arrabidaea brachypoda and assessment of their mti-Trypanosoma cruzi activity.
La subespecie brachypoda se distribuye entre Brasil, Paraguay y Bolivia; en tanto que las subespecies disadena, nictitans y patellaria crecen desde el centro de Mexico y las Indias Occidentales hasta Argentina.
En la descripcion original de Lantana brachypoda, Hayek cita erroneamente el ejemplar Fiebrig 2032, cuando los ejemplares estudiados de la especie llevan en su etiqueta original el numero 2432.