00504nas a2200109   4500008004100000245016800041210006900209300001200278490000700290100001800297856007900315       1985                        eng d00aDiel and seasonal variation in species composition and abundance of caridean shrimps ( Crustacea, Decapoda) from seagrass meadows on the north coast of Puerto Rico0 aDiel and seasonal variation in species composition and abundance  a150-1620 v361 aBauer, R., T.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-0022214549&partnerID=4000655nas a2200181   4500008004100000245013800041210006900179300001000248490000700258653002100265653002700286653001400313653001000327653001900337100001800356700001900374856008000393       2006                        eng d00aFlagellar setae of the second antennae in decapod shrimps: Sexual dimorphism and possible role in detection of contact sex pheromones0 aFlagellar setae of the second antennae in decapod shrimps Sexual  a51-600 v4910aCaridean shrimps10aContact chemoreception10aSensillae10aSetae10aSex pheromones1 aBauer, R., T.1 aCaskey, J., L.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-33747599865&partnerID=4002453nas a2200145   4500008004100000245010800041210006900149260000800218300001400226490000800240520199400248100001302242700001802255856003402273       2007                        eng d00aGonopore sexing technique allows determination of sex ratios and helper composition in eusocial shrimps0 aGonopore sexing technique allows determination of sex ratios and  cJun  a1875-18860 v1513 aAn evaluation of the social organization and sexual system of eusocial species of Synalpheus has been hindered because it has not been possible to determine the sexual composition of colony helpers (workers). The external sexual characters typically used to sex caridean shrimps are lacking in Synalpheus. We used SEM sexing technique to determine the sexual composition of helpers in colonies of Synalpheus regalis, S. rathbunae, S. chacei, S. rathbunae A (see Morrison et al. Mol Phylogen Evol 30:563-568, 2004), and S. filidigitus. Colonies consisted of both sexes and sex ratios of helpers generally conformed to 50:50 female to male. Females were characterized by gonopores with U-shaped slits on the coxae of the third pereopods (first walking legs) while males had oval gonopore openings on the coxae of the fifth pereopods (third or last walking legs). In S. chacei, S. filidigitus, and S. rathbunae A, a few helpers were found that had both male and female gonopores (intersexes). All three reproductive females (queens) of S. filidigitus examined were intersexes. Sexing of helpers allowed us to test some hypotheses about sexual differences in helper morphology that might indicate task specialization (division of labor). Male helpers were not different from female ones in body size (except in S. regalis: males somewhat larger) and in fighting chela size. The lack of sexual dimorphism in these characters suggests no male-female specialization in colony tasks such as defense. The presence of male and female helpers similar in size suggests that the sexual system of these eusocial species is gonochoristic, although protandry of some sort in S. filidigitus can not be ruled out. The intersexuality observed in a few individuals may be due to developmental anomalies, protandry, or even simultaneous hermaphroditism. Finally, the sexing technique allowed us to establish that new colonizers of unoccupied sponges in S. rathbunae are a single male and female of helper size.1 aToth, E.1 aBauer, R., T.  u<Go to ISI>://00024661430002501765nas a2200145   4500008004100000245015300041210006900194260000800263300001000271490000700281520126600288100001301554700001801567856003401585       2008                        eng d00aSynalpheus paraneptunus (Crustacea : Decapoda : Caridea) populations with intersex gonopores: a sexual enigma among sponge-dwelling snapping shrimps0 aSynalpheus paraneptunus Crustacea Decapoda Caridea populations w  cMay  a49-590 v513 aCaridean shrimp populations are usually gonochoristic, i.e., composed of separate sexes; however, some carideans are protandric sex changers or simultaneous hermaphrodites. In this contribution we investigated the sexual composition and its determination in two sponge-dwelling Synalpheus species with different degrees of sociality. Because the usual external sexing methods (presence or absence of appendices masculinae in males) can not be used in Synalpheus spp., we sexed individuals by observation of male and female gonopores using scanning electron microscopy (SEM). We found that populations of two species of the Synalpheus paraneptunus complex consist almost entirely of individuals with both male and female gonopores (termed herein "intersexes"). Such a high incidence of intersexes has not been previously reported in other decapods. We performed morphological and behavioral observations to test various hypotheses explaining the presence of intersex gonopores. Whereas protandry and simultaneous hermaphroditism are not likely to occur in these two species, capacity of immature helpers to mature as either sex, or developmental anomaly without adaptive significance could explain the presence of both female and male gonopores in these shrimps.1 aToth, E.1 aBauer, R., T.  u<Go to ISI>://000256323300005