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80 results for “Sexual dichromatism”
FIGURE 5 in Ahaetulla nasuta anomala (Annandale, 1906) (Squamata: Colubridae), resurrected as a valid species with marked sexual dichromatism
FIGURE 5. Ahaetulla anomala; A. brown morph (♀) and green morph (♂), B. pattern less green morph (♂) head close-up C. brown morph (♀) head close-up, D. sub-adult(♂), E. sub-adult(♀), F. adult (♂). Note: A–E Specimens from around North Orissa University Campus, Baripada, Odisha, India; F. Specimen from Kamalgazi, Kolkata. West Bengal, India.
FIGURE 4 in Ahaetulla nasuta anomala (Annandale, 1906) (Squamata: Colubridae), resurrected as a valid species with marked sexual dichromatism
FIGURE 4. Hemipenis of Ahaetulla anomala (NCBS-AQ-185); A. Asulcal view, B. Sulcal view and C. lateral view. Scale bar = 2mm.
FIGURE 3 in Ahaetulla nasuta anomala (Annandale, 1906) (Squamata: Colubridae), resurrected as a valid species with marked sexual dichromatism
FIGURE 3. Phylogenetic relationships of the genus Ahaetulla, Dendrelaphis and Chrysopelea. A. Maximum likelihood tree with bootstrap support shown at each node, B. Bayesian phylogenetic tree posterior probability are shown at each node.
FIGURE 2 in Ahaetulla nasuta anomala (Annandale, 1906) (Squamata: Colubridae), resurrected as a valid species with marked sexual dichromatism
FIGURE 2. Map showing the distribution of Ahaetulla anomala in India and Bangladesh. Yellow triangle is the type locality of A. anomala.
FIGURE 6 in Ahaetulla nasuta anomala (Annandale, 1906) (Squamata: Colubridae), resurrected as a valid species with marked sexual dichromatism
FIGURE 6. Ahaetulla anomala (NCBS-AQ 183) collected from Takatpur, Baripada, Odisha. A. dorsal, B. ventral, C. Head lateral, D. head dorsal and E. head ventral. Scale bar = 5mm.
FIGURE 1 in Ahaetulla nasuta anomala (Annandale, 1906) (Squamata: Colubridae), resurrected as a valid species with marked sexual dichromatism
FIGURE 1.Holotype of Ahaetulla anomala (ZSI15463) collected from Santragachi on the Bengal-Nagpur Railway line, West Bengal state, India. A. dorsal, B. ventral, C. Head lateral, D. head dorsal and E. head ventral. Scale bar = 5mm.
Losses of sexual dichromatism involve rapid changes in female plumage colors to match males in New World blackbirds
<p>Differences in coloration between the sexes (sexual dichromatism) can increase or decrease in a species through evolutionary changes in either or both sexes diverging or converging in their colors. Few previous studies, however, have examined the relative rates of such changes, particularly when dichromatism is lost. Using reflectance data from 37 species of the New World blackbird family (<em>Icteridae</em>), we compared evolutionary rates of plumage color change in males and females when dichromatism was either increasing (colors diverging) or decreasing (colors converging). Increases in dichromatism involved divergent changes in both sexes at approximately equal rates. Decreases in dichromatism, in contrast, involved changes in females to match male plumage colors that were significantly more rapid than any changes in males. Such dramatic changes in females show how selection can differ between the sexes. Moreover, these evolutionary patterns support the idea that losses of dimorphism involve genetic mechanisms that are already largely present in both sexes, whereas increases in dimorphism tend to involve the appearance of novel sex-specific traits, which evolve more slowly. Our results have broad implications for how sexual dimorphisms evolve.</p>
FIGURES4–10 in A new sexually dichromatic species of Telenomus Haliday (Platygastroidea: Scelionidae) from India
FIGURES4–10.Bright field imagesof Telenomus chandishae sp.n.4,Vertex (male); 5,Frons (female,paratype); 6,Head and mesonotum (female); 7, Pleuron (female); 8, Metasoma (female); 9, Wings (female); 10, Frons (male)
FIGURES 13–18. Telenomus xanthosoma Johnson, female. 13 in A new sexually dichromatic species of Telenomus Haliday (Platygastroidea: Scelionidae) from India
FIGURES 13–18. Telenomus xanthosoma Johnson, female. 13, Head and mesosoma (dorsal view); 14, Head and mesosoma (lateral view); 15, Antennae; 16, Frons; 17, Wings; 18, Habitus (dorsal view) (Courtesy: Sophie Cardinal, CNCI, Ottawa)
FIGURES 1–3 in A new sexually dichromatic species of Telenomus Haliday (Platygastroidea: Scelionidae) from India
FIGURES 1–3. Bright field images of Telenomus chandishae sp. n. 1, Dorsal view of habitus (female); 2, Lateral view of habitus (female); 3, Dorsalview of habitus (male)
FIGURES 13–18. Telenomus xanthosoma Johnson, female. 13 in A new sexually dichromatic species of Telenomus Haliday (Platygastroidea: Scelionidae) from India
FIGURES 13–18. Telenomus xanthosoma Johnson, female. 13, Head and mesosoma (dorsal view); 14, Head and mesosoma (lateral view); 15, Antennae; 16, Frons; 17, Wings; 18, Habitus (dorsal view) (Courtesy: Sophie Cardinal, CNCI, Ottawa)
FIGURES 4–10 in A new sexually dichromatic species of Telenomus Haliday (Platygastroidea: Scelionidae) from India
FIGURES 4–10. Bright field images of Telenomus chandishae sp. n. 4, Vertex (male); 5, Frons (female, paratype); 6, Head and mesonotum (female); 7, Pleuron (female); 8, Metasoma (female); 9, Wings (female); 10, Frons (male)
FIGURES 1–3 in A new sexually dichromatic species of Telenomus Haliday (Platygastroidea: Scelionidae) from India
FIGURES 1–3. Bright field images of Telenomus chandishae sp. n. 1, Dorsal view of habitus (female); 2, Lateral view of habitus (female); 3, Dorsal view of habitus (male)
Data from: Mite load predicts the quality of sexual color and locomotor performance in a sexually dichromatic lizard
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Male-biased sexual selection, but not sexual dichromatism, predicts speciation in birds
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Data from: Reduced sexual dichromatism, mutual ornamentation, and individual quality in the monogamous Zenaida dove, Zenaida aurita
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Data from: Sexual dichromatism in wing pigmentation of New World dragonflies follows Rensch’s rule
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Losses of sexual dichromatism involve rapid changes in female plumage colors to match males in New World blackbirds
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Data from: Multiple origins of sexual dichromatism and aposematism within large carpenter bees
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Data from: Recent speciation and elevated Z-chromosome differentiation between sexually monochromatic and dichromatic species of Australian teals
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