Internuncial neuron see association neuron

internuncial process (PLATY) The cell processes (trabecula) connecting the perikarya of cestode and trematode tegumental cells with the distal cytoplasm.

interoceptors n. [L. inter, between; (re)capere, to take] Sense organs situated internally that respond to internal conditions, as opposed to exteroceptors.

interosculant a. [L. inter, between; osculari, to kiss] Having characters common to 2 or more species or groups.

interpetaloid a. [L. inter, between; Gr. petalon, leaf] (ECHI-NOD: Echinoidea) Area between ambulacral areas.

interphase n. [L. inter, between; Gr. phasis, state] The period between succeeding mitoses. see interkinesis.

interpleural suture (ARTHRO: Insecta) In Odonata, suture between the meso- and metapleura.

interpleurite n. [L. inter, between; Gr. pleuron, side] (ARTHRO: Insecta) An intersegmentalia between the pleurites.

interplical a. [L. inter, between; plicare, to fold] Lying between folds.

interradial plates (ECHINOD: Crinoidea) Additional calyx plates between the radial plates in stalked crinoids.

interradius n.; pl. -radii [L. inter, between; radius, ray, spoke] 1. Area between radii or perradii in radially symmetrical animals. 2. (CNID) The second radius.

interramal a. [L. inter, between; ramus, branch] Between two rami.

interramal cirrus (ANN: Polychaeta) Cirrus on the ventral side of the notopodium.

interrugal a. [L. inter, between; ruga, wrinkle] Between rugae.

interrupted a. [L. inter, between; rumpere, to break] Irregular; asymmetrical; broken in continuity.

interscutal a. [L. inter, between; scutum, shield] Between scuta.

intersegmental a. [L. inter, between; segmentum, part] Between segments.

intersegmental furrow (ANN: Oligochaeta) In pigmented species of earthworms, the boundary between two consecutive segments where epidermis is thinnest and color is lacking.

intersegmental groove (ANN: Oligochaeta) In earthworms, a circumferential depression of strongly contracted specimens that contains the intersegmental furrow.

intersegmentalia n.pl.; sing. -lium [L. inter, between; segmentum, part] (ARTHRO: Insecta) 1. Dorsal and ventral plates associated with narrow intersegmental sclerites which develop in the intersegmental folds. 2. Setiferous areas associated with the mesothoracic spiracles in scarab beetles.

intersegmental membrane (ARTHRO: Insecta) The flexible conjunctiva between two secondary segments where contraction of the longitudinal muscles produce telescoping of the segments.

interseptal a. [L. inter, between; septum, wall] Spaces between septa.

intersex n. [L. inter, between; sexus, sex] An individual possessing both male and female characteristics; sex mosaic. see hermaphrodite.

intersomitic a. [L. inter, between; Gr. soma, body] Between body segments or somites.

interspaces n. [L. inter, between; spatium, space] 1. Intervening time or space. 2. (moll) Spaces between costa of a shell.

interspicular a. [L. inter, between; spiculum, small point] Between spicules.

intersterility n. [L. inter, between; sterilis, unfruitful] Cross-sterility between groups.

intersternite n. [L. inter, between; Gr. sternon, chest] (AR-THRO: Insecta) An intersegmental sclerite, located on the ventral side of the thorax; the spinasternum.

interstices n.pl. [L. interstitium, space between] A narrow space between the parts of a body or things close together; a crack, crevice or chink. interstitial a.

interstitial cells (CNID) Small undifferentiated epidermal cells which may give rise to cnidoblasts or nematocysts.

interstrial a. [L. inter, between; stria, groove] 1. Between two striae. 2. (ARTHRO: Insecta) see elytral intervals.

intertentacular organ (BRYO: Gymnolaemata) A small ciliated tube beneath the tentacle bases of the lophophore through which fertilized eggs pass to the outside.

intertergite n. [L. inter, between; tergum, back] An intersegment between tergites.

intertidal zone The area bounded by the high and low tide lines; also known as the littoral.

intertrochanteric a. [L. inter, between; Gr. trochanter, runner] (ARTHRO) Between trochanters.

interval n. [L. inter, between; vallum, a wall] 1. The space between elevations or depressions. see interspace. 2. Distance between points. 3. The time between periods of development.

interzonal a. [L. inter, between; zona, belt] Connection between chromatids during separation at anaphase in mitosis.

interzooidal budding (BRYO: Stenolaemata) Budding that occurs outside of the living chambers of zooids producing a bud nonrelated to an individual parent zooid.

interzooidal growth (BRYO: Phylactolaemata) Growth of a wall between new polypides and parental polypides.

interzooidal polymorph (BRYO: Gymnolaemata) Polymorph between zooids communicating with two or more zooids in a space smaller than that occupied by an autozooid.

intestinal groove (ARTHRO: Crustacea) In Decapoda, marine lobsters with a short, transverse groove of the posterior carapace.

intestinal region (ARTHRO: Crustacea) In a decapod carapace, a short transverse area behind the cardiac region; posterior cardiac lobe.

intestinal siphon (ECHI) A narrow tube associated with the midgut; an accessory intestine.

intestine n. [L. intestina, entrails] The chief digestive portion of the enteron; gut.

intima n. [L. intimus, innermost] The internal membranous lining of an organ. intimal a.

intorted n. [L. in, in; torquere, to twist] A turning or twisting in any direction from the vertical.

in toto In its entirety; entirely; altogether.

intra-alar bristles (ARTHRO: Insecta) In Diptera, a row of two or three bristles between the supra-alar and dorsocentral bristle groups.

intracellular a. [L. intra, within; cellula, small cell] Occurring within a cell or cells.

intrachange n. [L. intra, within; cambiare, to barter] Exchange of segments within a chromosome resulting in chromosomal structural changes.

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