phylum of marine worms

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• Phylum — For other uses, see Phyla …   Wikipedia

• phylum Chaetognatha — noun arrowworms: a group of small active transparent marine worms • Syn: ↑Chaetognatha • Derivationally related forms: ↑chaetognathous (for: ↑Chaetognatha), ↑chaetognathan (for: ↑ …   Useful english dictionary

• marine ecosystem — Introduction       complex of living organisms in the ocean environment.       Marine waters cover two thirds of the surface of the Earth. In some places the ocean is deeper than Mount Everest is high; for example, the Mariana Trench and the… …   Universalium

• Annelid — Temporal range: Early Ordovician–Recent[1] …   Wikipedia

• animal — animalic /an euh mal ik/, animalian /an euh may lee euhn, mayl yeuhn/, adj. /an euh meuhl/, n. 1. any member of the kingdom Animalia, comprising multicellular organisms that have a well defined shape and usually limited growth, can move… …   Universalium

• annelid — /an l id/, n. 1. any segmented worm of the phylum Annelida, including the earthworms, leeches, and various marine forms. adj. 2. belonging or pertaining to the Annelida. Also, annelidan /euh nel i dn/. [1825 35; see ANNELIDA] * * * Any member of… …   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

• circulation — circulable /serr kyeuh leuh beuhl/, adj. /serr kyeuh lay sheuhn/, n. 1. an act or instance of circulating, moving in a circle or circuit, or flowing. 2. the continuous movement of blood through the heart and blood vessels, which is maintained… …   Universalium

• arthropod — /ahr threuh pod /, n. 1. any invertebrate of the phylum Arthropoda, having a segmented body, jointed limbs, and usually a chitinous shell that undergoes moltings, including the insects, spiders and other arachnids, crustaceans, and myriapods. adj …   Universalium

• Chaetognatha — Arrow worms Temporal range: Lower Cambrian–Recent …   Wikipedia

• ribbon worm — any of various slender, unsegmented marine worms of the phylum Nemertea, being able to contract and stretch to an extreme extent. [1850 55] * * * ▪ invertebrate also called  bootlace worm, proboscis worm, nemertine, or nemertean        any member …   Universalium