slit sensilla (ARTHRO: Crustacea) In Decapoda, small pits lying just distal to the walking leg joints; insertions of the dendrites of 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 Proso-branchia, a non-retractable, short, mobile eminence at the anterior end on which the mouth is formed.
social facilitation (ARTHRO: Insecta) An increase of activity from seeing or hearing others engaged in the same activity.
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