first maxillae (ARTHRO: Insecta) The second pair of appendages belonging to the mouth, posterior to the mandibles or jaws; the maxillae.
first phragma (ARTHRO: Insecta) A transverse apodeme of Diptera, under the anterior promontory of the mesonotum and internally connecting the antepronota.
first reviser The first author to publish a definite choice of one among two or more conflicting names or zoological inter pretations that are equally available under the ICZN.
first segment The nearest segment of any segmented appendage nearest the body at point of attachment.
first species rule Authors that specify the first species named in a new genus to be the type of that genus; generally the works of older authors in which no generic type was specified.
first thoracic spiracle (ARTHRO: Insecta) The mesothoracic spiracle, sometimes dislocated into the posterior part of the prothorax.
first trochanter (ARTHRO: Insecta) The first segment of a telo-podite; the basipodite.
fissate a. [L. fissus, cleft] Cleft or split; having fissures or cracks.
fissile a. [L. fissus, cleft] Capable of being divided or separated into layers; divided into parallel lamellae.
fission n. [L. fissus, cleft] The splitting of a single chromosome into two chromosomes; splitting of one organism into two organisms. see fusion.
fissiparous a. [L. fissus, cleft; parere, to produce] Reproduction or propagation by fission.
fissure n. [L. fissura, cleft] A narrow opening, slit, furrow or groove separating adjacent tissues, parts or organs.
fistula n.; pl. -las [L. fistula, pipe] 1. A reed, pipe or tube. 2. (ARTHRO: Insecta) The proboscis of Lepidoptera. fistular a.
fix v. [L. fixus, bind] To kill and preserve specimens for observation and retention.
fixation n. [L. fixus, bind] (MOLL: Bivalvia) The process of animals permanently attaching themselves to the substrate.
fixative n. [L. fixus, bind] A chemical compound which has the quality of fixing and preserving specimens for observation and retention.
fixed finger (ARTHRO: Crustacea) The distal immovable part of the propodus of the chela; the pollex.
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