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Duffy Emmett - One of the best experts on this subject based on the ideXlab platform.
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FIGURE 25. Synalpheus thele n in The sponge-dwelling snapping shrimps (Crustacea, Decapoda, Alpheidae, Synalpheus) of Discovery Bay, Jamaica, with descriptions of four new species
2018Co-Authors: Iii, Kenneth S Macdonald, Hultgren Kristin, Duffy EmmettAbstract:FIGURE 25. Synalpheus thele n. sp. Holotype non-ovigerous individual CL: 2.93 mm (USNM 1126373, original VIMS 08 JAM 891402) from Agelas cf. clathrodes, Columbus Park, Discovery Bay, Jamaica: A, Chela of minor first pereopod, setae removed, anterior region, in mesial view; B, same, lateral view. Allotype ovigerous female CL: 3.32 mm (USNM 1126374, original VIMS 08 JAM 891401) from A. cf. clathrodes, Columbus Park, Discovery Bay, Jamaica: C, Chela of minor first pereopod, anterior region, mesial view. Non-ovigerous individual CL: 2.97 mm (VIMS 08 JAM 891002) from A. cf. clathrodes, Columbus Park, Discovery Bay, Jamaica: D, Chela of minor first pereopod, anterior region, dorsal view. Non-ovigerous individual CL: 3.13 mm (VIMS 08 JAM 891003) from A. cf. clathrodes, Columbus Park, Discovery Bay, Jamaica: E, Chela of minor first pereopod, setae removed, anterior region, lateral view. Ovigerous female CL: 3.32 mm (VIMS 08 JAM 6117) from A. cf. clathrodes, Columbus Park, Discovery Bay, Jamaica: F, Chela of minor first pereopod, setae removed, mesial view. Scale bar = 0.15 mm for A, B; 0.25 for C, D, E, F
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FIGURE 10 in The sponge-dwelling snapping shrimps (Crustacea, Decapoda, Alpheidae, Synalpheus) of Discovery Bay, Jamaica, with descriptions of four new species
2018Co-Authors: Iii, Kenneth S Macdonald, Hultgren Kristin, Duffy EmmettAbstract:FIGURE 10. Synalpheus elizabethae. Non-ovigerous individual CL: 2.29 mm (08 JAM 070102) from canals of H. intestinalis, Columbus Park, Discovery Bay, Jamaica: A, ventral region of abdomen, lateral view; B, Chela of major first pereopod, anterior region, ventral view. S. regalis. Non-ovigerous individual CL: 2.09 mm (08 JAM 620202) from canals of H. intestinalis, Columbus Park, Discovery Bay, Jamaica: C, ventral region of abdomen, lateral view; D, Chela of major first pereopod, anterior region, ventral view. Scale bar = 0.4 mm for A, B; 0.5 mm for C, D
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FIGURE 5. Synalpheus corallinus n in The sponge-dwelling snapping shrimps (Crustacea, Decapoda, Alpheidae, Synalpheus) of Discovery Bay, Jamaica, with descriptions of four new species
2018Co-Authors: Iii, Kenneth S Macdonald, Hultgren Kristin, Duffy EmmettAbstract:FIGURE 5. Synalpheus corallinus n. sp. Holotype non-ovigerous individual CL: 3.40 mm (USNM 112363, original VIMS 08 JAM 7002) from Hyattella intestinalis, Dairy Bull Reef, Jamaica: A, carapace, anterior region, and cephalic appendages, dorsal view; B, Chela of major first pereopod, anterior region, ventral view; C, telson, dorsal view. Allotype Ƥ CL: 3.93 mm (USNM 112364, original VIMS 08 JAM 7001) from H. intestinalis, Dairy Bull Reef, Jamaica: D, carapace, anterior region, and cephalic appendages, dorsal view; E, Chela of major first pereopod, anterior region, ventral view; F, telson, dorsal view. Scale bar = 0.5 m
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FIGURE 22. Synalpheus thele n in The sponge-dwelling snapping shrimps (Crustacea, Decapoda, Alpheidae, Synalpheus) of Discovery Bay, Jamaica, with descriptions of four new species
2018Co-Authors: Iii, Kenneth S Macdonald, Hultgren Kristin, Duffy EmmettAbstract:FIGURE 22. Synalpheus thele n. sp. Holotype non-ovigerous individual CL: 2.93 mm (USNM 1126373, original VIMS 08 JAM 891402) from Agelas cf. clathrodes, Columbus Park, Discovery Bay, Jamaica: A, carapace, anterior region, and cephalic appendages, dorsal view; B, Chela of major first pereopod, ventral view; C, same, anterior region. Allotype ovigerous female CL: 3.32 mm (USNM 1126374, original VIMS 08 JAM 891401) from A. cf. clathrodes, Columbus Park, Discovery Bay, Jamaica: D, carapace, anterior region, and cephalic appendages, dorsal view; E, telson and uropods, dorsal view; F, Chela of major first pereopod, anterior region, ventral view. Scale bar = 0.5 mm for A, C, D, F; 0.75 mm for B, E
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FIGURE 17. Synalpheus plumosetosus n in The sponge-dwelling snapping shrimps (Crustacea, Decapoda, Alpheidae, Synalpheus) of Discovery Bay, Jamaica, with descriptions of four new species
2018Co-Authors: Iii, Kenneth S Macdonald, Hultgren Kristin, Duffy EmmettAbstract:FIGURE 17. Synalpheus plumosetosus n. sp. Holotype non-ovigerous individual CL: 2.55 mm (USNM 1126369, original VIMS 08 JAM 2706), from Auletta cf. sycinularia, Dairy Bull Reef, Jamaica: A, carapace, anterior region, and cephalic appendages, dorsal view; B, Chela of major first pereopod, ventral view; C, telson and left uropods, dorso-lateral view. Allotype ovigerous female CL: 2.62 mm (USNM 1126370, original VIMS 08 JAM 2704) from Auletta cf. sycinularia, Dairy Bull Reef, Jamaica: D, carapace, anterior region, and cephalic appendages, dorsal view; E, Chela of major first pereopod, anterior region, ventral view; F, telson, dorsal view. Scale bar = 0.4 mm for A, C, D, E, F; 0.75 for B
Marin Ivan - One of the best experts on this subject based on the ideXlab platform.
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FIGURE 2 in A review of the pontoniine shrimp genus Rapipontonia Marin, 2007 (Decapoda: Caridea: Palaemonidae), with the description of a new species from the Indo-West Pacific
2018Co-Authors: Marin IvanAbstract:FIGURE 2. Rapipontonia platalea (Holthuis, 1951), female (A, E - H), male (B - D) (RMNH, D 51044): A—Chela of first pereiopod; B, C—second pereiopods of male; D—same, Chela; E—major second pereiopod; F—same, Chela; Gminor second pereiopod; H—same, Chela. Scale bar: 1 mm
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FIGURE 6. Rapipontonia hydra n in A review of the pontoniine shrimp genus Rapipontonia Marin, 2007 (Decapoda: Caridea: Palaemonidae), with the description of a new species from the Indo-West Pacific
2018Co-Authors: Marin IvanAbstract:FIGURE 6. Rapipontonia hydra n. sp., paratype female, (RMNH, D 48164): A—first pereiopod; B—same, Chela; Cmajor second pereiopod; D—same, Chela; E—minor second pereiopod; F—same, Chela; G—third pereiopod; H—same, grasping mechanism. Scale bar: 1 mm
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FIGURE 5 in Crinoid-associated shrimps of the genus Laomenes A. H. Clark, 1919 (Caridea: Palaemonidae: Pontoniinae): new species and probable diversity
2018Co-Authors: Marin IvanAbstract:FIGURE 5. Laomenes amboinensis (De Man, 1888), male. A, distal part of carapace and rostrum. B, major pereiopod II. C, same, Chela. D, minor pereiopod II. E, same, Chela. Scale 1 mm
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FIGURE 13 in Crinoid-associated shrimps of the genus Laomenes A. H. Clark, 1919 (Caridea: Palaemonidae: Pontoniinae): new species and probable diversity
2018Co-Authors: Marin IvanAbstract:FIGURE 13. Laomenes clarki sp. nov., male. A, distal part of carapace and rostrum. B, major pereiopod II. C, same, Chela. D, minor pereiopod II. E, same, Chela. F, pleopod I. G, appendix masculina. Scale 1 mm; F, G, without scal
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FIGURE 3 in A review of the pontoniine shrimp genus Rapipontonia Marin, 2007 (Decapoda: Caridea: Palaemonidae), with the description of a new species from the Indo-West Pacific
2018Co-Authors: Marin IvanAbstract:FIGURE 3. Rapipontonia galene (Holthuis, 1952), female (RMNH, D 48423): A—carapace and rostrum, lateral view; B—antennular peduncle, dorsal; C—basal segments of third maxilliped; D—Chela of first pereiopod; E, G—second pereiopods; F, H—same, Chela; I—grasping mechanism of third pereiopod; J—ventral spines on propodus of third pereiopod. Scale bar: 1 mm
Rahayu, Dwi Listyo - One of the best experts on this subject based on the ideXlab platform.
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FIGURE 4. Pteropagurus inermis n in A new genus with two new species of hermit crabs (Crustacea, Decapoda, Paguroidea, Paguridae) from an unique habitat
2018Co-Authors: Mclaughlin, Patsy A., Rahayu, Dwi ListyoAbstract:FIGURE 4. Pteropagurus inermis n. sp., holotype ovig. female (sl = 1.6 mm) (MNHN Pg 7633). a, carpus and Chela of right cheliped (dorsal view); b, carpus and Chela of right cheliped (lateral view); c, carpus and Chela of left cheliped (lateral view); d, Chela of left cheliped (dorsal view); e, left second pereopod (lateral view, setae omitted); f, right second pereopod (mesial view); g, left third pereopod (lateral view, setae omitted). Scale equals 1 mm
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FIGURE 5. Paguristes lewinsohni n in Two new species of Paguristes sensu stricto (Decapoda: Anomura: Paguroidea: Diogenidae) and a review of Paguristes pusillus Henderson
2018Co-Authors: Mclaughlin, Patsy A., Rahayu, Dwi ListyoAbstract:FIGURE 5. Paguristes lewinsohni n. sp., Dahlak Archipelago, stn 7, male paratype (shield damaged) (TAU 1827). a, Chela and carpus of left cheliped (dorsal view; setae omitted); b, dactyl of left Chela (mesial view, setae omitted); c, Chela and carpus of right cheliped (dorsal view, setae omitted); d, dactyl of right Chela (mesial view, setae omitted); e, right second pereopod (lateral view); f, dactyl, propodus and carpus of right second pereopod (mesial view, setae omitted); g, left third pereopod (lateral view); h, dactyl and propodus of left third pereopod (mesial view, setae omitted). Scales equal 2 mm
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FIGURE 5. Pteropagurus spina n in A new genus with two new species of hermit crabs (Crustacea, Decapoda, Paguroidea, Paguridae) from an unique habitat
2018Co-Authors: Mclaughlin, Patsy A., Rahayu, Dwi ListyoAbstract:FIGURE 5. Pteropagurus spina n. sp. holotype ovig. female (sl = 1.2 mm) (MNHN Pg 7637). a, shield and cephalic appendages (aesthetascs omitted); b, carpus and Chela of right cheliped (dorsal view); c, carpus and Chela of left cheliped (dorsolateral view); d, left second pereopod (lateral view); e, left third pereopod (lateral view); f, fourth pereopod (lateral view); g, sternites of second and third pereopods (thoracic sternites XI & XII) (ventral view); h, telson. Scales equal 0.5 mm
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FIGURE 2. Paguristes alcocki n in Two new species of Paguristes sensu stricto (Decapoda: Anomura: Paguroidea: Diogenidae) and a review of Paguristes pusillus Henderson
2018Co-Authors: Mclaughlin, Patsy A., Rahayu, Dwi ListyoAbstract:FIGURE 2. Paguristes alcocki n. sp., Western Australia: holotype male (7.8 mm) (WAM C 29554). a, Chela and carpus of left cheliped (dorsal view; setae omitted); b, dactyl of left Chela (mesial view, setae omitted); c, Chela and carpus of right cheliped (setae omitted); d, dactyl of right Chela (mesial view, most setae omitted); e, right second pereopod (lateral view, setae omitted); f, dactyl and propodus of left second pereopod (mesial view, setae omitted); g, left third pereopod (lateral view); h, dactyl and propodus of right third pereopod (mesial view). Scales equal 2 mm
Robbie S Wilson - One of the best experts on this subject based on the ideXlab platform.
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costs and benefits of increased weapon size differ between sexes of the slender crayfish cherax dispar
The Journal of Experimental Biology, 2009Co-Authors: Robbie S Wilson, Rob S James, C L Bywater, Frank SeebacherAbstract:Unreliable signals of weapon strength are considered to be problematic for signalling theory and reliable signals are predicted to be the dominant form of signalling among conspecifics in nature. Previous studies have shown that males of the Australian freshwater crayfish (Cherax dispar) routinely use unreliable signals of strength whereas females use reliable signals of weapon strength. In this study, we examined the performance benefits of increased weapon (Chela) size for both males and females of C. dispar. In addition, we investigated the possibility of functional trade-offs in weapon size by assessing the relationship between Chela size and maximum escape swimming performance. We found males possessed larger and stronger Chelae than females and the variance in Chela force was greater for males than females. By contrast, females possessed greater absolute and body length-specific escape swimming speeds than males. Swimming speed was also negatively correlated with Chela size for males but not females, suggesting that a functional trade-off exists for males only. Decreases in swimming speed with increases in weapon size suggest there could be important fitness costs associated with larger Chelae. Larger weaponry of males may then act as a handicap ensuring large Chelae are reliable signals of quality.
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weapon size is a reliable indicator of strength and social dominance in female slender crayfish cherax dispar
Functional Ecology, 2008Co-Authors: C L Bywater, Michael J Angilletta, Robbie S WilsonAbstract:Weapons are specialized structures that are commonly used by animals to signal fighting ability and resource holding potential during agonistic encounters. Current theory predicts weapon size should reliably indicate weapon strength and unreliable signals should only occur at very low frequencies in nature. However, a recent study found weapon size was an unreliable signal of strength during agonistic interactions among males of the slender crayfish (Cherax dispar). In this study, we investigated the relationship between morphology, performance and social dominance in females of C. dispar. Based on current theory, we predicted Chela size would reliably indicate Chela strength and would relate indirectly to dominance via its influence on strength. We found females that possessed large Chelae were more likely to possess stronger Chelae, and those individuals with stronger Chelae were more likely to win competitive bouts. The best predictive model of the relationships among morphology, performance and dominance indicated Chela size indirectly affected social dominance via its influence on strength, thus demonstrating displays of weaponry are reliable signals of fighting ability. Reliable signals of strength among females of C. dispar supports current theory predicting stable signalling systems should largely consist of honest displays of strength. However, this contrasts with previous work demonstrating that male C. dispar routinely uses unreliable signals of weapon strength during agonistic encounters.
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dishonest signals of strength in male slender crayfish cherax dispar during agonistic encounters
The American Naturalist, 2007Co-Authors: Robbie S Wilson, Michael J Angilletta, Rob S James, Carlos A Navas, Frank SeebacherAbstract:Abstract: Many animals resolve disputes without combat by displaying signals of potential strength during threatening displays. Presumably, competitors use each other's displays to assess their relative strengths, and current theory predicts that these signals of strength should generally be honest. We tested this prediction by investigating the relationships among morphology, performance, and social dominance in males of the slender crayfish Cherax dispar. Crayfish routinely use their enlarged front claws (Chelae) for both intimidation and fighting, making this species ideal for studying the honesty of weapon size. We evaluated five competing models relating morphological and physiological traits to dominance during paired competitive bouts. Based on the best model, larger Chelae clearly resulted in greater dominance; however, Chela strength had no bearing on dominance. Thus, displays of Chela size were dishonest signals of strength, and the enlarged Chelae of males seemingly function more for intimidati...
Frank Seebacher - One of the best experts on this subject based on the ideXlab platform.
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costs and benefits of increased weapon size differ between sexes of the slender crayfish cherax dispar
The Journal of Experimental Biology, 2009Co-Authors: Robbie S Wilson, Rob S James, C L Bywater, Frank SeebacherAbstract:Unreliable signals of weapon strength are considered to be problematic for signalling theory and reliable signals are predicted to be the dominant form of signalling among conspecifics in nature. Previous studies have shown that males of the Australian freshwater crayfish (Cherax dispar) routinely use unreliable signals of strength whereas females use reliable signals of weapon strength. In this study, we examined the performance benefits of increased weapon (Chela) size for both males and females of C. dispar. In addition, we investigated the possibility of functional trade-offs in weapon size by assessing the relationship between Chela size and maximum escape swimming performance. We found males possessed larger and stronger Chelae than females and the variance in Chela force was greater for males than females. By contrast, females possessed greater absolute and body length-specific escape swimming speeds than males. Swimming speed was also negatively correlated with Chela size for males but not females, suggesting that a functional trade-off exists for males only. Decreases in swimming speed with increases in weapon size suggest there could be important fitness costs associated with larger Chelae. Larger weaponry of males may then act as a handicap ensuring large Chelae are reliable signals of quality.
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dishonest signals of strength in male slender crayfish cherax dispar during agonistic encounters
The American Naturalist, 2007Co-Authors: Robbie S Wilson, Michael J Angilletta, Rob S James, Carlos A Navas, Frank SeebacherAbstract:Abstract: Many animals resolve disputes without combat by displaying signals of potential strength during threatening displays. Presumably, competitors use each other's displays to assess their relative strengths, and current theory predicts that these signals of strength should generally be honest. We tested this prediction by investigating the relationships among morphology, performance, and social dominance in males of the slender crayfish Cherax dispar. Crayfish routinely use their enlarged front claws (Chelae) for both intimidation and fighting, making this species ideal for studying the honesty of weapon size. We evaluated five competing models relating morphological and physiological traits to dominance during paired competitive bouts. Based on the best model, larger Chelae clearly resulted in greater dominance; however, Chela strength had no bearing on dominance. Thus, displays of Chela size were dishonest signals of strength, and the enlarged Chelae of males seemingly function more for intimidati...
