Posterior cephalic foramen see foramen magnum

posterior cribellum (ARTHRO: Chelicerata) In Arachnida, the posterolateral spinnerets in Stenochilidae.

posterior cross vein (ARTHRO: Insecta) In Diptera, a wing cross vein at the apex of the discal cell.

posterior flange (MOLL: Bivalvia) In oysters, the flange posterior to the left valve separated from the main body of the valve by the posterior radial groove.

posterior gastric pit (ARTHRO: Crustacea) In Decapoda, one of two small dorsal depressions midline on the exterior of carapace identifying the point of insertion of the stomach muscle.

posterior lateral tooth (MOLL: Bivalvia) In heterodonts, the lateral tooth situated posterior to the beaks and ligament.

posterior notch (MOLL) An indentation in the outer lip near the suture.

posterior orbit (ARTHRO: Insecta) In Diptera, part of the head behind the eyes.

posterior ridge (MOLL: Bivalvia) A ridge passing over or originating near the umbo and running diagonally towards the posteroventral area of the valve.

posterior respiratory process (ARTHRO: Insecta) In Diptera, among Syrphidae larvae, caudal respiratory organ composed of two fused tubes.

posterior sinus (MOLL: Polyplacophora) A recess in the posterior median line of a tail valve, formed by the tegmentum or in some forms by the articulamentum.

posterior slope (MOLL: Bivalvia) The surface sector running posteroventrally from the umbo of the valve.

posterior spiracle (ARTHRO: Insecta) Spiracles on the caudal segment or the most caudal pair of segments.

posterior spiracular plate (ARTHRO: Insecta) In Diptera, the flattened tip of each tube that bears the posterior spiracles of Syrphidae larvae.

posterior stigmatal tubercle (ARTHRO: Insecta) In caterpillars, tubercles on the thoracic and abdominal segment.

posterior tentorial arms (ARTHRO: Insecta) The apodeme extending anteriad from the posterior tentorial pits of the head.

posterior tooth (ARTHRO: Crustacea) In Decapoda, a midline carapace tooth between the posterior margin and the marginal groove.

posterobiprostatic a. [L. posterus, following; bis, twice; Gr. prostates, stands before] (ANN: Oligochaeta) With reference to male terminalia, prostates in segment xix after loss of a pair in segment xvii of an acanthodrilin set.

posterodorsal margin (MOLL: Bivalvia) The margin of the dorsal part of the shell posterior to the beaks.

posterolateral a. [L. posterus, following; latus, side] Posteriorly and toward the side.

postesophageal commissure (ARTHRO: Insecta) The commissure that joins the tritocerebral lobes of the brain and passes beneath the stomodeum; tritocerebral commissure.

postesophageal loop (SIPUN) An extra loop in the foregut of species of Sipunculus and some Xenosiphon.

post-fibers (ARTHRO: Crustacea) In Decapoda, giant nerve fibers in crayfish that supply the deep parts of the abdominal flexors and are responsible for escape reaction. see pre-fi-bers.

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