Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

812Maggenti and Gardnerfrom a thin layer of resistant endochorion and a thick amberlayer that joins the cap to the rest of the chorion.seam n. [A.S. seam] A visible line of juncture between parts; asuture.seam cells (NEMATA) The central cell row in the lateral chordsthat have no membranous extension beneath the cuticle.sebaceous a. [L. sebaceus, tallow] Pertaining to secretion, orcomposed of oily or fatty substances.sebific duct/gland Tubes of the collaterial glands.Secernentea, secereneteans n.; n.pl. [L. secernere, toseparate] One of the two major classes of the PhylumNemata, including most of the plant- and animal-parasiticnematodes; formerly Phasmidia. see Adenophorea.second antennae (ARTHRO: Crustacea) 1. Antennae of thesecond cephalic segment. 2. Antennae of some males areuniramous; two-jointed structures used to clasp femalesduring mating.secondary fiber (PORIF) A fiber that connects primary fibersand is not oriented to the surface.secondary host see intermediate hostsecondary intergradation The intergradation or hybridizationof two distinct and previously isolated populations thathave reestablished contact. see primary intergradation.secondary iris cells see accessory pigment cellssecondary ocelli (ARTHRO: Insecta) Ocelli of the larvae ofholometabolous insects; lateral ocelli.secondary pigment cells see accessory pigment cellssecondary pleometrosis (ARTHRO: Insecta) In Hymenoptera,a process in a colony in which a founding queen is laterjoined by others to form a pleometrotic association. seepleometrosis.secondary reproductive see nymphoid reproductivesecondary riblet (MOLL: Bivalvia) A riblet appearing later indevelopment, however, weaker than primary riblets.secondary segmentation Any form of body segmentation notconforming with the embryonic metamerism.