Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

8Maggenti and Gardneraccessory pigment cells (ARTHRO: Insecta) As many astwenty-four cells that surround the retinulae of a compoundeye; in superposition eyes the pigment granules assumedifferent positions in light and darkness; also knownas secondary pigment cells, secondary iris cells, iris pigmentcells and outer pigment cells.accessory pulsatile organs (ARTHRO) Pulsating structuresconnected with the hemocoel that are concerned withmaintaining a circulation through the appendages, but pulsatingindependently from the heart.accessory sac (PLATY: Cestoda) A sac in the proglottid wallthat opens into the genital atrium.accessory spicule (PORIF) A category of megasclere, supplementalto the primary skeleton, may be located anywhere.accessory stylets (NEMER) Replacement stylets that arestored in reserve stylet sacs or pouches.accessory subcoastal vein (ARTHRO: Insecta) In Perlidae, thevein given off from the subcosta, branching toward theapex of the wing.accessory testis (ARTHRO: Insecta) In Coleoptera, the coiledmiddle section of the vas deferens serving as a reservoirfor mature sperm.accidental evolution A condition that occurs as a consequenceof mutation, but does not appear to improve survivalvalue.accidental host A host in which a pathogenic parasite is notcommonly found.accidental myiasis (ARTHRO: Insecta) In Diptera, the presencewithin a host of a fly larva that is not normally parasitic;pseudomyiasis.accidental parasite A parasite in other than its normal host;an incidental parasite.accidental transport Unintentional movement of a pathogenfrom one location to another by an animal not normally associatedwith the parasite or disease. see phoresis.