Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

832Maggenti and Gardnera. In Polyplacophora, an abrupt indentation in the insertionplate. b. In Gastropoda, a shallow incision to deep fissue inthe outer margin of the aperture.slit band see selenizoneslit ray (MOLL: Polyplacophora) A shallow groove or row ofpores or pits beginning at a slit and extending to the apexof the valve on the ventral side.slit sense organs see lyriform organsslit sensilla (ARTHRO: Crustacea) In Decapoda, small pits lyingjust distal to the walking leg joints; insertions of the dendritesof the joint proprioceptors of Homarus.slope-faced (MOLL: Bivalvia) Referring to the face of the shell,i.e., central, anterior or posterior slope.snout n. [ME. snoute, snout] (MOLL: Gastropoda) In Prosobranchia,a non-retractable, short, mobile eminence at theanterior end on which the mouth is formed.social facilitation (ARTHRO: Insecta) An increase of activityfrom seeing or hearing others engaged in the same activity.social hierarchy see hierarchysocial homeostasis (ARTHRO: Insecta) The steady statemaintenance either by control of microclimate in the nest,or the control of population density, behavior and physiologyof the society members.social hormones see pheromonessocial insects (ARTHRO: Insecta) 1. The ants, termites andsome bees and wasps in which individuals of the same speciescooperate in caring for the young, a reproductive divisionof labor is present, and an overlap of at least two generationsin life stages contributing to the colony; eusocialinsects. 2. A social insect that belongs to either a presocialor eusocial species.social interaction (ARTHRO: Insecta) Relationships among individualsof a colony in which the behavior of one or a fewindivduals influences others in the colony; social facilitationand social homeostasis are two interactions.social parasite (ARTHRO: Insecta) A symbiont found in the