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453 results for “diving beetles”
FIGURE 1 in Limbodessus skalei sp. nov., a new diving beetle species from the west Papuan Archipelago (Coleoptera: Dytiscidae, Bidessini)
FIGURE 1. The Limbodessus species known from New Guinea and adjacent islands. Dorsal habitus of L. skalei sp. nov., holotype, male (a); L. alexanderi (b), L. baliem (c) and L. compactus (d). Scale bar = 1 mm.
FIGURE 9 in A review of Peruvian diving beetles of the genus Hydaticus Leach, 1817, with description of Hydaticus (Prodaticus) panguana sp. nov. and notes on other Neotropical species (Coleoptera: Dytiscidae)
FIGURE 9. Habitats of H. panguana sp. nov. and H. lateralis (A), and H. subfasciatus and H. lateralis (B) in Panguana, Huànuco, Peru. Shallow and temporary forest pool with rotten leaves and wooden debris (A), and Aguajal forest pond (B).
FIGURES 4–7 in A review of Peruvian diving beetles of the genus Hydaticus Leach, 1817, with description of Hydaticus (Prodaticus) panguana sp. nov. and notes on other Neotropical species (Coleoptera: Dytiscidae)
FIGURES 4–7. Median lobe of aedeagus in dorsal (A) and lateral view (B): H. panguana sp. nov. (4), H. lateralis (5), H. subfasciatus (6), and H. xanthomelas (7). Scale bar = 1 mm.
FIGURE 17 in Hamadiana chapadensis, a new genus and species of diving beetle from Brazil (Coleoptera, Dytiscidae, Laccophilinae, Laccophilini)
FIGURE 17. Habitat of Hamadiana chapadensis sp. n. Brazil: Goiás State, Alto Paraíso de Goiás County, "Rio dos Couros".
FIGURES 12–15 in Hamadiana chapadensis, a new genus and species of diving beetle from Brazil (Coleoptera, Dytiscidae, Laccophilinae, Laccophilini)
FIGURES 12–15. Hamadiana chapadensis sp. n.: 12) median lobe, dorsal view; 13) median lobe, left lateral view; 14) left paramere, left lateral view; 15) right paramere, left lateral view.
Evidence for speciation underground in diving beetles (Dytiscidae) from a subterranean archipelago
<p class="MsoCommentText">Most subterranean animals are assumed to have evolved from surface ancestors following colonisation of a cave system, however very few studies have raised the possibility of 'subterranean speciation' in underground habitats (i.e. obligate cave-dwelling organisms (troglobionts) descended from troglobiotic ancestors). Numerous endemic subterranean diving beetle species from spatially-discrete calcrete aquifers in Western Australia (stygobionts) have evolved independently from surface ancestors; however, several cases of sympatric sister species raises the possibility of subterranean speciation. We tested this hypothesis using vision (phototransduction) genes that are evolving under neutral processes in subterranean species and purifying selection in surface species. Using sequence data from 32 subterranean and five surface species in the genus <i>Paroster</i> (Dytiscidae), we identified deleterious mutations in: long wavelength opsin (<i>lwop</i>), arrestin 1 (<i>arr1</i>), and arrestin 2 (<i>arr2</i>)<i> </i>shared by a sympatric sister-species triplet, <i>arr1</i> shared by a sympatric sister-species pair, and <i>lwop</i> and <i>arr2</i> shared among closely related species in adjacent calcrete aquifers. In all cases, a common ancestor possessed the function-altering mutations, implying they were already adapted to aphotic environments. Our study represents one of the first confirmed cases of subterranean speciation in cave insects. The assessment of genes undergoing pseudogenisation provides a novel way of testing modes of speciation and the history of diversification in blind cave animals.</p>
FIGURE 2 in A Baltic amber species of the diving beetle genus Coptotomus Say, 1830 (Coleoptera Dytiscidae: Coptotominae)
FIGURE 2. † Coptotomus balticus sp. n., female, paratype: A) habitus (dorsal side, total length = 5.9 mm); B) habitus ventral side; C) elytron with strioles (scale bar = 1 mm); D) ventral side with pronotal process and apical palpomere of both the maxillary and labial palps bifid (scale bar = 1 mm); E) metasternum and metaventrite (scale bar = 1 mm).
FIGURE 1 in A Baltic amber species of the diving beetle genus Coptotomus Say, 1830 (Coleoptera Dytiscidae: Coptotominae)
FIGURE 1. † Coptotomus balticus sp. n., male, holotype: A) habitus (dorsal side); B) habitus ventral side, scale bar = 1 mm; C) Pro- and mesotarsus, and apical palpomere of both the maxillary and labial palps distinctly bifid (red arrows); D) Metatarsomeres 1 to 4 with externoapical angles lobed.
FIGURE 3. Coptotomus longulus lenticus Hilsenhoff, 1980 in A Baltic amber species of the diving beetle genus Coptotomus Say, 1830 (Coleoptera Dytiscidae: Coptotominae)
FIGURE 3. Coptotomus longulus lenticus Hilsenhoff, 1980, USA, Ohio, Holmes (scale bar = 1 mm): A) habitus (dorsal side); B) Metasternum and metaventrite of C. longulus longulus (USA, Montana).
FIGURE 53 in Four new species of the diving beetle genus Laccophilus Leach, 1815 from Madagascar (Coleoptera, Dytiscidae, Laccophilini)
FIGURE 53. Map showing the distribution of known localities of the newly described species. Red dot: L. leguyaderi; Blue dots: L. bergsteni; Magenta dot: L. bergsteni and L. rakouthae; yellow dot: L. makay. Names of corresponding protected areas or massifs indicated in italics above dots.
FIGURES 47–52 in Four new species of the diving beetle genus Laccophilus Leach, 1815 from Madagascar (Coleoptera, Dytiscidae, Laccophilini)
FIGURES 47–52. Habitats of Laccophilus makay sp. nov. (47–49) and Laccophilus rakouthae sp. nov. (50–52). (47) Spring on sandy bank of river Andranomanitsy (Makay massif, 500 m); (48) Large pool with clear water, sandy bottom and masses of tree roots (Makay massif, 550 m). (49) Shadowed pool with sandy bottom and lots of orange deposit, beneath rock wall in a canyon (Makay massif, 540 m; type locality of L. makay); (50) Small uncultivated rice paddy field, in agricultural landscape (Ankaratra massif, Manjakatompo, 1,650 m); (51) Large eutrophic pond full of helophytes, surrounded by degraded forest (Ankaratra massif, Manjakatompo, Étang des Tilapia, 1,700 m; type locality of L. rakouthae); (52) Close-up view of the margin of the same pond.
FIGURES 43–46 in Four new species of the diving beetle genus Laccophilus Leach, 1815 from Madagascar (Coleoptera, Dytiscidae, Laccophilini)
FIGURES 43–46. Habitats of Laccophilus leguyaderi sp. nov. (43–44) and Laccophilus bergsteni sp. nov. (45–46). (43) Shallow brooklet with peaty bottom in subalpine grassland (Andringitra massif, 2,000 m); (44) Rather deep brook with peaty bottom, slowly flowing among subalpine shrubs (Andringitra massif, 1,970 m; type locality of L. leguyaderi); (45) Slowly flowing stream in natural forest with muddy bottom and lots of tree leaves (Ankaratra massif, Tavolotara, 2,000 m); (46) Slowly flowing stream on flat area in subalpine grassland (Ankaratra massif, 2,400 m; type locality of L. bergsteni).
FIGURES 35–42 in Four new species of the diving beetle genus Laccophilus Leach, 1815 from Madagascar (Coleoptera, Dytiscidae, Laccophilini)
FIGURES 35–42. Median lobe of aedeagus in lateral (35, 37) and ventral (36, 38) view and left (39, 41) and right (40, 42) parameres of: (35, 36, 39, 40) Laccophilus rakouthae sp. nov. (holotype); (37, 38, 41, 42) Laccophilus transversovittatus (specimen from Isalo massif). Scale bar: 0.1 mm.
FIGURES 31–34 in Four new species of the diving beetle genus Laccophilus Leach, 1815 from Madagascar (Coleoptera, Dytiscidae, Laccophilini)
FIGURES 31–34. Habitus (31, 32) and ventral surface (33, 34) of: (31, 33) Laccophilus rakouthae sp. nov. (31, holotype; 33: male paratype); (32, 34) Laccophilus transversovittatus (male specimens from Isalo massif). Scale bar: 1 mm.
FIGURES 23–30 in Four new species of the diving beetle genus Laccophilus Leach, 1815 from Madagascar (Coleoptera, Dytiscidae, Laccophilini)
FIGURES 23–30. Left (23, 25, 27, 29) and right (24, 26, 28, 30) parameres of: (23, 24) Laccophilus leguyaderi sp. nov. (holotype); (25, 26) Laccophilus bergsteni sp. nov. (holotype); (27, 28) Laccophilus makay sp. nov. (holotype); (29, 30) Laccophilus alluaudi (male specimen from Isalo massif). Scale bar: 0.1 mm.
FIGURES 9–22 in Four new species of the diving beetle genus Laccophilus Leach, 1815 from Madagascar (Coleoptera, Dytiscidae, Laccophilini)
FIGURES 9–22. Median lobe of aedeagus in lateral (9–15) and ventral (16–22) view of: (9, 16) Laccophilus leguyaderi sp. nov. (holotype); (10, 17) Laccophilus bergsteni sp. nov. (holotype); (11, 18) Laccophilus makay sp. nov. (holotype); Laccophilus alluaudi, male specimens from (12, 19) Montagne d'Ambre, (13, 14, 20, 21) Isalo massif, and (15, 22) Ibity massif. Scale bar: 0.1 mm.
FIGURES 5–8 in Four new species of the diving beetle genus Laccophilus Leach, 1815 from Madagascar (Coleoptera, Dytiscidae, Laccophilini)
FIGURES 5–8. Ventral surface of: (5) Laccophilus leguyaderi sp. nov. (holotype); (6) Laccophilus bergsteni sp. nov. (holotype); (7) Laccophilus makay sp. nov. (holotype); (8) Laccophilus alluaudi (male specimen from Isalo massif). Scale bar: 1 mm.
FIGURES 1–4 in Four new species of the diving beetle genus Laccophilus Leach, 1815 from Madagascar (Coleoptera, Dytiscidae, Laccophilini)
FIGURES 1–4. Habitus in dorsal view of: (1) Laccophilus leguyaderi sp. nov. (holotype); (2) Laccophilus bergsteni sp. nov. (holotype); (3) Laccophilus makay sp. nov. (holotype); (4) Laccophilus alluaudi (male specimen from Isalo massif). Scale bar: 1 mm.
FIGURE 13 in Taxonomic revision of Australasian diving beetles in the genus Leiodytes Guignot 1936 (Coleoptera: Dytiscidae, Bidessini)
FIGURE 13. (A) Shallow and exposed pools on a forest clearing near Kali Bumi, Wanggar, Nabire, W New Guinea, habitat of L. migrator; (B) Rest pool, bottom with very thick layer of leaves (up to 70 cm), and margins with area of wet leaves that form small open water once stepped on, open savanna forest in Wasur, S New Guinea, habitat of L. migrator and L. wattsi sp. nov.
FIGURE 12 in Taxonomic revision of Australasian diving beetles in the genus Leiodytes Guignot 1936 (Coleoptera: Dytiscidae, Bidessini)
FIGURE 12. (A) Creek at Manton Dam, Northern Territory (NT 1), habitat of L. wattsi sp. nov. and L. migrator; (B) Queensland, Forest swamp near Cape Tribulation Road, south of Daintree ferry station (QLD 35), habitat of L. surianiae sp. nov., L. wattsi sp. nov. and L. migrator (B).
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