- Metazoans
- Metazoan Met`a*zo"an, n.; pl. {Metazoans}. (Zo["o]l.) One of the Metazoa. [1913 Webster]
The Collaborative International Dictionary of English. 2000.
The Collaborative International Dictionary of English. 2000.
metazoans — n.; n. pl. [Gr. meta, after; zoon, animal] 1. A small phylum of endoparasitic, ciliated, multicellular organisms composed of two layers, lacking skeletal, muscular, nervous, digestive, respiratory or excretory elements. 2. Often regarded as… … Dictionary of invertebrate zoology
Cambrian explosion — The Cambrian explosion or Cambrian radiation was the seemingly rapid appearance of most major groups of complex animals around Ma|530, as evidenced by the fossil record. [http://www.ucmp.berkeley.edu/cambrian/camb.html The Cambrian Period] ]… … Wikipedia
phylogeny — phylogenetic /fuy leuh jeuh net ik/, phylogenetical, phylogenic, adj. phylogenetically, adv. phylogenist, n. /fuy loj euh nee/, n. 1. the development or evolution of a particular group of organisms. 2. the evolutionary history of a group of… … Universalium
Plankton — For other uses, see Plankton (disambiguation). Photomontage of planktonic organisms Plankton (singular plankter) are any drifting organisms (plants … Wikipedia
Sponge — This article is about the aquatic animal. For the porous cleaning tool, see Sponge (material). For other uses, see Sponge (disambiguation). Sponge Temporal range: Ediacaran–Recent … Wikipedia
Choanoflagellate — Choanoflagellates Scientific classification Domain … Wikipedia
Precambrian time — Interval of geologic time from с 3. 8 billion years ago, the age of the oldest known rocks, to 544 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important… … Universalium
Life Sciences — ▪ 2009 Introduction Zoology In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… … Universalium
MicroRNA — The stem loop secondary structure of a pre microRNA from Brassica oleracea. A microRNA (abbreviated miRNA) is a short ribonucleic acid (RNA) molecule found in eukaryotic cells. A microRNA molecule has very few nucleotides (an average of 22)… … Wikipedia
Trichoplax adhaerens — Taxobox name = Trichoplax adhaerens image caption = Light microscope image of Trichoplax (specimen ca. 0.5 mm across) regnum = Animalia subregnum = Metazoa superphylum = Parazoa phylum = Placozoa genus = Trichoplax species = adhaerens binomial =… … Wikipedia