annelid
31arthropod — /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 …
32nervous system — Anat., Zool. 1. the system of nerves and nerve centers in an animal or human, including the brain, spinal cord, nerves, and ganglia. 2. a particular part of this system. Cf. autonomic nervous system, central nervous system, peripheral nervous… …
33photoreception — photoreceptive, adj. /foh toh ri sep sheuhn/, n. the physiological perception of light. [1905 10; PHOTO + RECEPTION] * * * Biological responses to stimulation by light, most often referring to the mechanism of vision. In one celled organisms such …
34reproductive system, animal — Introduction any of the organ systems by which animals reproduce. The role of reproduction is to provide for the continued existence of a species; it is the process by which living organisms duplicate themselves. Animals compete with… …
35Nuchal organ — The Nuchal organ (no). Source: doi:10.1007/s004350000022 The nuchal organ is a ciliated pit[1] or groove present at the posterior end of the prostomium of annelid worms …
36segmented worm — noun worms with cylindrical bodies segmented both internally and externally • Syn: ↑annelid, ↑annelid worm • Derivationally related forms: ↑annelid (for: ↑annelid) • Hypernyms: ↑ …
37Sipuncula — Taxobox name = Sipuncula fossil range = Cambrian Recent regnum = Animalia subregnum = Metazoa superphylum = Lophotrochozoa phylum = Sipuncula phylum authority = Rafinesque, 1814 subdivision ranks = Classes, Orders and Families subdivision =… …
38Mollusca — Temporal range: Cambrian–Recent …
39Vetustovermis — taxobox fossil range = fossil range|Mid Cambrian image caption = The very similar organism Nectocaris regnum=Animalia genus= Vetustovermis species= V. planus species authority = Glaessner 1979citation author = Glaessner, M. F. year = 1979 title …
40Convoluted tubule — is the compound of a metanephridium which is wrapped with capillaries. The process of reabsorption occurs in this part of the metanephridium. References This annelid related article is a stub. You can help Wikipedia by expanding it …
