Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology 881sylleibid n. [Gr. syllektos, gathered together] (PORIF) An aquiferoussystem transitional between syconoid and leuconoidconditions, with elongate choanocyte chambers groupedaround a common exhalant channel.sylvan, silvan a. [L. sylva, silva, forest] Pertaining to or inhabitingthe forests or woodland areas.sylvatic, silvatic a. [L. sylva, silva, forest] In disease ecology,a parasite existing normally in the wild and not in the humanenvironment. see synanthropism.symbiology n. [Gr. symbiosis, life together; logos, discourse]The study of symbioses.symbion(t) n. [Gr. symbiosis, life together; on, being] Anyorganism that exists in a relationship of mutual benefit withanother organism; a symbiote.symbiosis n. [Gr. symbiosis, life together] 1. The mutuallybeneficial living together of individuals of two different species.2. Interrelationship of different species of organisms,ranging from beneficial, to neutral, to dehabilitating. symbiotica. see mutualism, commensalism, parasitism.symbiote n. [Gr. symbiosis, life together] An organism living insymbiosis; symbiont.symmetry n. [Gr. symmetria, due proportion] The mode ofbody organization. symmetical a. see bilateral symmetry,radial symmetry.sympathetic system 1. That portion of the autonomic nervoussystem directly connected with the brain and innervatingthe fore and middle intestine, heart and certain other parts.2. (ARTHRO: Insecta) see stomogastric nervous system,ventral sympathetic nervous system.sympatric hybridization The production of hybrid individualsbetween two sympatric species.sympatric speciation Speciation with geographic isolation;the reproductive isolation occurring between segments of asingle population.sympatry n. [Gr. syn, together; patria, native country] Theoccurrence of two or more populations in the same area;usually referring to areas of overlap in species distributions.