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223 results for “Libellulidae”
The mechanistic origin of amber pigmentation of Perithemis tenera (Say, 1840) wings (Anisoptera: Libellulidae)
<p>Animal coloration serves various signaling and non-signaling functions. In damselflies and dragonflies (Odonata), such colors may not only play photoprotective and/or thermoregulatory roles but also serve as visual signals during courtship and/or agonistic interactions. Here, we analyzed the coloration of <em>Perithemis tenera</em> wings, a potential secondary sexual ornament, applying spectrophotometry and visual modeling to gain a deeper understanding of their color mechanisms and functions. The amber coloration of the <em>P. tenera</em> wings results from the interaction of light with both the melanized chitin matrix and possibly ommochrome pigments. This coloration stands out significantly against the dry Brazilian savannah, the natural habitat of <em>P. tenera</em>, making it easily detectable by conspecifics. Additionally, by fitting the absorbance curve of <em>P. tenera</em> wings to the extinction coefficient of different melanins, we deduced that pheomelanin is likely the pigment embedded in the wing’s chitinous matrix. If the presence of pheomelanin is confirmed, a pigment predominantly found in vertebrates and known to be associated with an increased risk of melanoma and Parkinson’s disease, <em>P. tenera</em> could become a valuable species for studying these diseases and their potential links to pigmentation, as well as its roles in insects’ immune systems and cuticle sclerotization.</p>
FIGURES 13–20 in The larva of the genus Misagria Kirby, 1889 (Odonata: Libellulidae)
FIGURES 13–20. Misagria parana: (13) male distal part of the abdomen, dorsal view (exuvia in ethanol); (14) male distal part of the abdomen, lateral view (exuvia in ethanol); (15) female distal part of the abdomen, dorsal view (exuvia in ethanol); (16) male distal part of the abdomen, lateral view (exuvia in ethanol); (17) male anal pyramid, dorsal view; (18) male anal pyramid, lateral view; (19) female anal pyramid, dorsal view; (20) female anal pyramid, lateral view.
FIGURES 11–12 in The larva of the genus Misagria Kirby, 1889 (Odonata: Libellulidae)
FIGURES 11–12. Misagria parana: (11) male abdomen, dorsal view (exuvia in ethanol); (12) female abdomen, dorsal view (exuvia in ethanol).
FIGURES 1–6 in The larva of the genus Misagria Kirby, 1889 (Odonata: Libellulidae)
FIGURES 1–6. Misagria parana: (1) general habitus of last instar larva; specimen in ethanol with end of abdomen contracted anteroposteriorly and slightly up-turned, head also slightly up-turned; (2) anterior part of thorax and head, dorsal view; (3) frons and antennae, dorsal view; (4) head, frontal view; (5) mandibles (oriented as in Watson 1956), a) right mandible, b) left mandible; (6) left maxillae, posteroventral view.
FIGURE 2 in A new species of Micrathyria Kirby, 1889 from México and Central America (Anisoptera: Libellulidae), with a key to Mexican species
FIGURE 2. Micrathyria paulsoni sp. nov., male paratype: a) pterothorax, b) hamuli lateral view, c) hamuli ventral view, d) cerci, lateral view, e) cerci, dorsal view, f) epiproct.
FIGURE 1 in A new species of Micrathyria Kirby, 1889 from México and Central America (Anisoptera: Libellulidae), with a key to Mexican species
FIGURE 1. Micrathyria paulsoni sp. nov., male and female in tandem, Parque Javier Clavijero, Xalapa.
FIGURE 9 in A new species of Orthetrum Newman, 1833 (Odonata: Libellulidae) from the Andaman Islands, India
FIGURE 9. Habitat of Orthetrum andamanicum sp. nov.—Chidiyatapu; South Andaman island; 01-vii-2017. Photo: M. Bedjanič.
FIGURE 8 in A new species of Orthetrum Newman, 1833 (Odonata: Libellulidae) from the Andaman Islands, India
FIGURE 8. Currently known distribution of Orthetrum andamanicum sp. nov. on the Andaman Islands— yellow squares: localities of holotype and paratype; green circles: photographic records by M. Bedjanič and K.A. Subramanian.
FIGURES 1–2 in A new species of Orthetrum Newman, 1833 (Odonata: Libellulidae) from the Andaman Islands, India
FIGURES 1–2. Orthetrum andamanicum sp. nov. [holotype male]—(1) whole specimen, lateral view [abdomen broken; S5 missing]; (2) head, frontal view. Photo: V.J. Kalkman.
FIGURE 11. Map depicting localities where B in Description of Bradinopyga konkanensis sp. nov. (Odonata: Anisoptera Libellulidae) from the coastal region of Maharashtra, India
FIGURE 11. Map depicting localities where B. konkanensis has been observed so far, which includes: type locality, two localities where paratype males were collected, & additional seven localities where this species has been photographed.
FIGURE 6 in A new species of Orthetrum Newman, 1833 (Odonata: Libellulidae) from the Andaman Islands, India
FIGURE 6. Male of Orthetrum andamanicum sp. nov.—Chidiyatapu; South Andaman island; 01-vii-2017. Photo: M. Bedjanič.
FIGURE 9 in Description of Bradinopyga konkanensis sp. nov. (Odonata: Anisoptera Libellulidae) from the coastal region of Maharashtra, India
FIGURE 9. Compilation of B. konkanensis and morphologically similar species. (a-b) B. konkanensis; male: Vijaydurg (not collected), female: Devgad, (c-d) B. geminata; male: Devgad, female: Talebazar, Sindhudurg District, (e-f) Indothemis carnatica; male and female: Devgad, and (g) I. limbata sita; male: Dhamapur, Sindhudurg District, Maharashtra (Photo: Parag Rangnekar), & (h) I. limbata limbata female: Thailand (Photo: Dennis Farrell).
FIGURE 8. B in Description of Bradinopyga konkanensis sp. nov. (Odonata: Anisoptera Libellulidae) from the coastal region of Maharashtra, India
FIGURE 8. B. konkanensis photographed in situ. (a) holotype (NCBS-BE493)- Vijaydurg, (b) allotype female (NCBS-BE495)- Vijaydurg, (c) male- Gawhe (Photo: Omkar Damle), (d) female- Murud-Janjira fort, (e) male- Ovalekar wadi, & (f) female- Ramdharneshwar.
FIGURE 7 in Description of Bradinopyga konkanensis sp. nov. (Odonata: Anisoptera Libellulidae) from the coastal region of Maharashtra, India
FIGURE 7. Vertex of head: (a) Bradinopyga geminata (NCBS-QA107)- male, (b) B. geminata (NCBS-QA106)- female, (c) Indothemis carnatica (NCBS-BH975)- male, & (d) I. carnatica (NCBS-BH976)- female. & (d) I. carnatica (NCBS-BH976)- female.
FIGURE 3 in Description of Bradinopyga konkanensis sp. nov. (Odonata: Anisoptera Libellulidae) from the coastal region of Maharashtra, India
FIGURE 3. Diagnostic characters of B. konkanensis. (a) pterostigma, (b) caudal appendages- lateral, (c) anterior hamule, (d) caudal appendages- lateral (e) caudal appendages- dorsal, (f) caudal appendages- ventral, (g) V4 of penis- lateral, & (h) V4 of penis- ventral. (a–c): NCBS-BE494, (d–f): NCBS-BM108
FIGURE 2 in Description of Bradinopyga konkanensis sp. nov. (Odonata: Anisoptera Libellulidae) from the coastal region of Maharashtra, India
FIGURE 2. Holotype male (NCBS-BE493). Caudal appendages: (a) caudal appendages- lateral (b) caudal appendages- dorsal, (c) hamuli- lateral, & (d) caudal appendages- ventral.
FIGURE 1 in Description of Bradinopyga konkanensis sp. nov. (Odonata: Anisoptera Libellulidae) from the coastal region of Maharashtra, India
FIGURE 1. Holotype male (NCBS-BE493). Habitus: (a) dorsal, (b) lateral, (c) base of left HW, & (d) vertex of head.
FIGURES 13–20 in Orthetrum erythronigrum sp. nov. (Odonata: Libellulidae) from the Great Nicobar Island, India
FIGURES 13–20. Orthetrum erythronigrum sp. nov. holotype male: (13) terminal abdominal segments, ventral view; 14–20 anal appendages: (14) ventral view; (15) dorsal view; (16) lateral view; (17) dorsal view; (18) ventral view; (19) lateral view; (20) secondary genitalia, lateral view.
FIGURES 7–12 in Orthetrum erythronigrum sp. nov. (Odonata: Libellulidae) from the Great Nicobar Island, India
FIGURES 7–12. Orthetrum erythronigrum sp. nov. holotype male: (7) head, frontal view; (8) thorax, lateral view; (9) secondary genitalia, lateral view; (10) pterostigma of forewing; (11) left hindwing; (12) abdomen lateral view.
FIGURES 1–6. 1–5 in Orthetrum erythronigrum sp. nov. (Odonata: Libellulidae) from the Great Nicobar Island, India
FIGURES 1–6. 1–5. Habitus of Orthetrum erythronigrum sp. nov.: (1) holotype male field photograph; (2) holotype male, lateral view; (3) paratype male (RMNH); (4) paratype female (RMNH); (5) photograph from Vijayanagar, Great Nicobar by Rajesh Kumar. (6) Type locality showing habitat, East-West Forest path, GNBR.
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