Syngenic see isogenic

syngonic a. [Gr. syn, together; gone, seed] The production of both sperm and eggs by the same gonad; hermaphroditic reproduction. see digonic, amphigonic.

synhaploid n. [Gr. syn, together; haploos, single] A condition derived from the fusion of two or more haploid nuclei. see double haploid.

synhesmia n. [Gr. syn, together; hesmos, swarm] A group of organisms swarming together in consequence of a reproductive drive. see androsynhesmia, gynosynhesmia.

synistate a. [Gr. syn, together; histos, tissue] (ARTHRO: In-secta) In Neuroptera, referring to the ligula being reduced to the condition of a median and sometimes slightly bilobed process, or totally atrophied.

synizesis n. [Gr. syn, together; hizein, to sit] The clumping of chromosomes in early prophase of the first meiotic division; may be either normal or abnormal.

synkaryon n. [Gr. syn, together; karyon, nucleus] A zygote nucleus formed by fusion of two gametic nuclei.

synlophe n. [Gr. syn, together; lophos, crest] (NEMATA: Se-cernentea] In numerous Trichostrongylidae, an enlarged longitudinal or oblique cuticular ridge on the body surface that serves to hold the nematodes in place on the gut wall.

synoecius, synoecious a. [Gr. synoikos, living in the same house] Producing both male and female gametes.

synoecy n. [Gr. synoikos, living in the same house] 1. Com-mensalism involving social insects where the guests are indifferently tolerated by the hosts. 2. An association between two species where one is benefited without harm to the other. see symphily, synechthry.

synoekete n. [Gr. synoikos, living in the same house] A tolerated guest of a host colony.

synoenocytes n. [Gr. syn, together; oenos, wine colored; ky-tos, container] (ARTHRO: Insecta) In dipteran Chironomi-dae, localization of oenocytes as distinctive organs.

synomone n. [Gr. syn, together; omone, mimics the ending of hormone] A chemical substance produced or acquired by an organism, that upon contact with an individual of another species, evokes a behavioral or physiological re sponse favorable to both emitter and receiver. see al-lelochemic.

synonyms [Gr. syn, together; onyma, name] In nomenclature, two or more names for the same taxon. see senior, junior, objective, subjective synonym. synonymous a.

synonymy n. [Gr. syn, together; onyma, name] A chronological list of scientific names applied to a given taxon, including dates of publication and authors of the names.

synopsis n.; pl. -es [Gr. syn, together; opsis, view] In taxonomy, a general summary of current knowledge of a group.

synoptic a. [Gr. syn, together; opsis, view] Pertaining to structures that upon comparison, are virtually identical.

synoptical key The arrangement of the more essential characters in order to identify specific taxa by selecting only those that apply.

synscleritous a. [Gr. syn, together; skleros, hard] (ARTHRO) The joining of a tergite and a sternite to form a complete ring. see discleritous.

syntagma see tagma syntelic a. [Gr. syn, together; telos, fulfillment] In mitosis, centromeres of the two chromatids of each chromosome if they are oriented to the same spindle pole at the first mei-otic division.

synthesis n.; pl. -ses [Gr. syn, together; titheni, to place] The formation of a more complex substance from simpler ones.

synthetic a. [Gr. syn, together; titheni, to place] Combining the structural characters of two or more dissimilar groups or forms into one group or form.

synthetic lethals Lethal chromosomes derived from normally viable chromosomes by crossing over.

synthetic theory The evolutionary theory, with mutation and selection as the basic elements.

synthorax n. [Gr. syn, together; thorax, chest] (ARTHRO: In-secta) The meso- and metathorax fused as a single unit of wing-bearing insects; pterothorax.

syntrophy n. [Gr. syn, together; trophon, food] (ARTHRO: In-secta) In social insects, the accidental feeding of symphiles or synoeketes during normal brood care.

syntype n. [Gr. syn, together; typos, type] Every specimen in a type-series in which no holotype or lectotype was designated.

syntypic a. [Gr. syn, together; typos, type] Referring to the same type.

synxenic a. [Gr. syn, together; xenos, guest] The rearing of one or more individuals of a single species along with one or more known species of organisms. see axenic, dixenic, monoxenic, polyxenic, trixenic, xenic.

synzoea n. [Gr. syn, together; zoe, life] (ARTHRO: Crustacea) In Malacostraca, pelagic juvenile stages of Stomatopod larvae.

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