¿Qué es pellicle en inglés?

In some systems ofbiological classification, theProtozoaare defined as a diverse group ofunicellulareukaryoticorganisms.

Historically, protozoawere defined as single - celled animals or organisms withanimal - like behaviors, such asmotilityandpredation.

The group was regarded as the zoological counterpart to the "protophyta", which were considered to be plant - like, as they are capable ofphotosynthesis.

The termsprotozoaandprotozoansare now mostly used informally to designate single - celled, non - photosyntheticprotists, such as theciliates, amoebaeandflagellates.

The term Protozoa was introduced in 1818 by German paleontologist and zoologistGeorg August Goldfußfor ataxonomicclass, but in later classification schemes the group was elevated to higher ranks, includingphylum, subkingdomandkingdom.

In several classification systems proposed byThomas Cavalier - Smithand his collaborators since 1981, Protozoa is ranked as a kingdom.

The seven - kingdom scheme proposed by Ruggiero et al.

In 2015, places eight phyla under Protozoa : Euglenozoa, Amoebozoa, Metamonada, Choanozoa, Loukozoa, Percolozoa, MicrosporidiaandSulcozoa.

This kingdom does not form aclade, but anevolutionary gradeorparaphyleticgroup, from which the fungi and animals are specifically excluded.