Raymond T Bauer

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A B S T R A C T Previous studies on two species of the genus Rhynchocinetes (''hingebeak'' shrimps) have described mating systems in which large dominant ''robustus'' males, with hypertrophied cheliped and third maxilliped weaponry, guard and defend smaller females during copulation. The sexual system of these species is gonochoric (separate sexes). In this(More)
Although mating has been described in several hermit crab species, the mechanics of spermatophore transfer have not previously been demonstrated. Evidence from pleopod and gonopore morphology, video observations, and inseminated females indicates that in Clibanarius vittatus the male applies a spermatophoric mass directly onto the female via the gonopores(More)
Observations on functional morphology and results from experiments demonstrate that setiferous epipods compose the major gill-cleaning mechanism in a penaeoid shrimp, Rimapenaeus similis. Epipods on the second maxillipeds and on pereopods 1-3 are equipped with long setae bearing an array of digitate scale setules. These multidenticulate setae reach to most(More)
In the grass shrimp Palaemonetes pugio, evidence suggests that males respond to an insoluble substance (i.e., contact sex pheromone) in or on the exoskeleton of the postmolt parturial female. Cuticular hydrocarbons, glycoproteins, or other compounds present on the surface of the female might serve as recognition signals. Cuticular hydrocarbons are known to(More)
Many freshwater shrimps (Decapoda, Caridea) have amphidromous life histories, with extended planktonic larval development in the sea. Larvae either are hatched upstream to drift down to the sea or are carried and released there by females. After development, postlarvae (juveniles) must migrate back up to their adult freshwater habitat. An amphidromous life(More)
Hatching (Stage-1) larvae of amphidromous shrimps do not feed and must reach salt water within a few days to molt to Stage 2, the first feeding instar. Stage-1 larvae are transported from to the sea after upstream hatching by drifting in stream flow or are carried to estuaries for hatching by females migrating downstream. Hatching usually occurs during(More)
The role of surface glycoproteins in mate recognition of the shrimp Palaemonetes pugio was studied using mating bioassays and fluorescence microscopy. Our data indicate that a glycoprotein associated with female shrimp functions in mate recognition in P. pugio. This glycoprotein is likely to be a glucosamine or an N-acetylglucosamine-containing glycoprotein(More)
Interest in chemoreception of decapod shrimps has been stimulated by observations indicative of sex pheromones, such as frenzied male searching and copulatory activity in the presence of premolt or recently postmolt reproductive females. Review of previous studies on shrimp mating behavior led to the formulation of hypotheses about the variation of chemical(More)