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453 results for “diving beetles”
FIGURE 11 in Taxonomic revision of Australasian diving beetles in the genus Leiodytes Guignot 1936 (Coleoptera: Dytiscidae, Bidessini)
FIGURE 11. Habitat of L. migrator: (A) Northern Territory, Kakadu NP, Old Jim Jim Road, rest pool of Barramundi Creek (NT 19); (B) Queensland, Cardwell, sandy and exposed pool, without emergent vegetation near Ellerbeck Road (QLD 38).
FIGURE 10 in Taxonomic revision of Australasian diving beetles in the genus Leiodytes Guignot 1936 (Coleoptera: Dytiscidae, Bidessini)
FIGURE 10. Maximum likelihood tree for Australasian Leiodytes. Neighbour joining tree (p-distances) calculated with Geneious (11.0.4.) software. The stars mark those specimens distributed over two divergent clades of L. migrator, which, however, occur syntopically.
FIGURE 7 in Taxonomic revision of Australasian diving beetles in the genus Leiodytes Guignot 1936 (Coleoptera: Dytiscidae, Bidessini)
FIGURE 7. Leiodytes wattsi sp. nov.: Median lobe of aedeagus: (A) ventral view, (B) lateral view; right paramere (inner surface): (C) lateral view. (Scale bar = 0.15 mm)
FIGURE 5 in Taxonomic revision of Australasian diving beetles in the genus Leiodytes Guignot 1936 (Coleoptera: Dytiscidae, Bidessini)
FIGURE 5. Leiodytes migrator: Median lobe of aedeagus: (A) ventral view, (B) lateral view; right paramere (inner surface): (C) lateral view. (Scale bar = 0.15 mm)
FIGURE 6 in Taxonomic revision of Australasian diving beetles in the genus Leiodytes Guignot 1936 (Coleoptera: Dytiscidae, Bidessini)
FIGURE 6. Leiodytes surianiae sp. nov.: Median lobe of aedeagus: (A) ventral view, (B) lateral view; right paramere (inner surface): (C) lateral view. (Scale bar = 0.15 mm)
FIGURE 1 in Taxonomic revision of Australasian diving beetles in the genus Leiodytes Guignot 1936 (Coleoptera: Dytiscidae, Bidessini)
FIGURE 1. Body outline and colour pattern of: (A) L. migrator from North Queensland, near Cardwell; (B) L. migrator from Ubirr Rock, Kakadu NP, Northern Territory; (C) L. surianiae sp. nov.; (D) L. wattsi sp. nov. (Scale bar = 1 mm)
FIGURE 2 in Taxonomic revision of Australasian diving beetles in the genus Leiodytes Guignot 1936 (Coleoptera: Dytiscidae, Bidessini)
FIGURE 2. Ventral surface of: (A) L. migrator; (B) L. surianiae sp. nov.; (C) L. wattsi sp. nov. (Scale bar = 1 mm)
FIGURE 3 in Taxonomic revision of Australasian diving beetles in the genus Leiodytes Guignot 1936 (Coleoptera: Dytiscidae, Bidessini)
FIGURE 3. Dorsal surface of head of: (A) L. migrator; (B) L. surianiae sp. nov.; (C) L. wattsi sp. nov. (Scale bar = 0.5 mm)
FIGURE 4 in Taxonomic revision of Australasian diving beetles in the genus Leiodytes Guignot 1936 (Coleoptera: Dytiscidae, Bidessini)
FIGURE 4. Morphological details of: L. migrator (A–C): (A) Head, pronotum and basal part of elytra with striae und punctation; (B) Prosternal process; (C) Metacoxae and metacoxal lines with metacoxal processes. L. wattsi sp. nov. (D): Metacoxae with numerous quite strong punctures, and metacoxal lines with metacoxal processes. Clypeodytes larsoni (E): Epipleuron anteriorly with a basal cavity posteriorly limited by a transverse carina (yellow arrows). L. migrator (F): Epipleuron anteriorly lacking a basal cavity posteriorly limited by a transverse carina (yellow arrows).
Data from: Two new species of Limbodessus diving beetles from New Guinea - short verbal descriptions flanked by online content (digital photography, μCT scans, drawings and DNA sequence data)
Background: To date only one species of Limbodessus diving beetles has been reported from the Island of New Guinea, L. compactus (Clark, 1862), which is widerspread in the Australian region. New information: We describe two new species of microendemic New Guinea Limbodessus and use a compact descriptive format flanked by enriched online content in wiki powered species pages. Limbodessus baliem sp.n. is described from ca. 1,600 m altitude in the Baliem Valley of Papua and Limbodessus alexanderi sp.n. from >3,000 m altitude north of Sugapa, Papua. Based on our analysis, we also transfer three species from other genera to Limbodessus Guignot, 1939, with the following changes: Limbodessus deflectus (Ordish, 1966), new combination; Limbodessus leveri (J. Balfour-Browne, 1944), new combination; and Limbodessus plicatus (Sharp, 1882), new combination.
Data from: Male clasping ability, female polymorphism and sexual conflict: fine-scale elytral morphology as a sexually antagonistic adaptation in female diving beetles
During sexual conflict, males and females are expected to evolve traits and behaviours with a sexually antagonistic function. Recently, sexually antagonistic coevolution was proposed to occur between male and female diving beetles (Dytiscidae). Male diving beetles possess numerous suction cups on their forelegs whereas females commonly have rough structures on their elytra. These rough structures have been suggested to obstruct adhesion from male suction cups during mating attempts. However, some diving beetle species are dimorphic, where one female morph has a rough elytra and the other has a smooth elytra. Here, we used biomechanics to study the adhesive performance of male suction cups on the female morphs in two diving beetle species: Dytiscus lapponicus and Graphoderus zonatus. We compared adhesion on the rough and the smooth female morphs to infer the function of the rough elytral modifications. We found that the adhesive force on the rough structures was much lower than on other surfaces. These findings support the suggestion of sexual conflict in diving beetles and a sexually antagonistic function of the rough female structures. In addition, males differed in their adhesive capacity on different female surfaces, indicating a male trade-off between adhering to smooth and rough female morphs.
Data from: Opsin transcripts of predatory diving beetles: a comparison of surface and subterranean photic niches
The regressive evolution of eyes has long intrigued biologists yet the genetic underpinnings remain opaque. A system of discrete aquifers in arid Australia provides a powerful comparative means to explore trait regression at the genomic level. Multiple surface ancestors from two tribes of diving beetles (Dytiscidae) repeatedly invaded these calcrete aquifers and convergently evolved eye-less phenotypes. We use this system to assess transcription of opsin photoreceptor genes among the transcriptomes of two surface and three subterranean dytiscid species and test whether these genes have evolved under neutral predictions. Transcripts for UV,long-wavelength and ciliary-type opsins were identified from the surface beetle transcriptomes. Two subterranean beetles showed parallel loss of all opsin transcription, as expected under 'neutral' regressive evolution. The third species Limbodessus palmulaoides retained transcription of a long-wavelength opsin (lwop) orthologue, albeit in an aphotic environment. Tests of selection on lwopindicated no significant differences between transcripts derived from surface and subterranean habitats, with strong evidence for purifying selection acting on L. palmulaoides lwop. Retention of sequence integrity and the lack of evidence for neutral evolution raise the question of whether we have identified a novel pleiotropic role for lwop, or an incipient phase of pseudogene development.
Data from: Protein expression parallels thermal tolerance and ecologic changes in the diversification of a diving beetle species complex
Physiological changes associated with evolutionary and ecological processes such as diversification, range expansion or speciation are still incompletely understood, especially for non-model species. Here we study differences in protein expression in response to temperature in a western Mediterranean diving beetle species complex, using two-dimensional differential gel electrophoresis with one Moroccan and one Iberian population each of Agabus ramblae and Agabus brunneus. We identified proteins with significant expression differences after thermal treatments comparing them with a reference EST library generated from one of the species of the complex (A. ramblae). The colonisation during the Middle Pleistocene of the Iberian peninsula by A. ramblae, where maximum temperatures and seasonality are lower than in the ancestral north African range, was associated with changes in the response to 27 °C in proteins related to energy metabolism. The subsequent speciation of A. brunneus from within populations of Iberian A. ramblae was associated with changes in the expression of several stress-related proteins (mostly chaperons) when exposed to 4 °C. These changes are in agreement with the known tolerance to lower temperatures of A. brunneus, which occupies a larger geographical area with a wider range of climatic conditions. In both cases, protein expression changes paralleled the evolution of thermal tolerance and the climatic conditions experienced by the species. However, although the colonisation of the Iberian peninsula did not result in morphological change, the speciation process of A. brunneus within Iberia involved genetic isolation and substantial differences in male genitalia and body size and shape.
FIGURES 6–7 in 5100 m above sea level: Agabus joachimschmidti sp. n. and notes on other high altitude diving beetles from Tibet and Bhutan (Coleoptera, Dytiscidae)
FIGURES 6–7. Habitat of Ilybiosoma yeti, small brook of melting and source water in Buddha Valley (Tibet South Central) at 4750 m.
FIGURES 1–5 in 5100 m above sea level: Agabus joachimschmidti sp. n. and notes on other high altitude diving beetles from Tibet and Bhutan (Coleoptera, Dytiscidae)
FIGURES 1–5. Habitus of: 1) Agabus joachimschmidti sp. n., 2) A. tibetanus; median lobe of aedeagus in lateral view of: 3) A. joachimschmidti sp. n., 4) A. tibetanus; 5) right paramere of A. joachimschmidti sp. n.
FIGURES 8–11 in Kakadudessus tomweiri, a new genus and species of diving beetle from tropical northern Australia, based on molecular phylogenetic and morphological data (Coleoptera, Dytiscidae, Bidessini)
FIGURES 8–11. Kakadudessus tomweiri sp.n. 8) Gungurul lookout in Kakadu National Park (locality 11, 1996), the white arrow marks the small rest pool near the bank; 9) Bowerbird Creek at Mary River Roadhouse near main road; 10–11) Small rest pool in the almost dry river bed of the Bowerbird Creek, 200 m upstream from main road (locality 15a, 2006). All photos by Lars Hendrich.
FIGURE 7 in Kakadudessus tomweiri, a new genus and species of diving beetle from tropical northern Australia, based on molecular phylogenetic and morphological data (Coleoptera, Dytiscidae, Bidessini)
FIGURE 7. Phylogram of the tree obtained in both MrBayes runs, numbers above branches are posterior probabilities (if>0.5, x100), numbers below branches are maximum likelihood boostrap values obtained from GARLI (if>50%). Note: Clypeodytes migrator will be transferred to Leiodytes by Hendrich & Wang in a forthcoming generic review.
FIGURES 2–5 in Kakadudessus tomweiri, a new genus and species of diving beetle from tropical northern Australia, based on molecular phylogenetic and morphological data (Coleoptera, Dytiscidae, Bidessini)
FIGURES 2–5. Kakadudessus tomweiri sp.n., male genitalia: 2) median lobe lateral aspect, 3) median lobe ventral aspect, 4) left paramere, 5) right paramere (scale bar 0.4 mm).
FIGURE 1 in Kakadudessus tomweiri, a new genus and species of diving beetle from tropical northern Australia, based on molecular phylogenetic and morphological data (Coleoptera, Dytiscidae, Bidessini)
FIGURE 1. Kakadudessus tomweiri sp.n., habitus of paratype, total length 2.2 mm, drawing by D. Paramonov, Riga, Latvia.
FIGURES 44–47 in Taxonomic revision of the Neotropical diving beetles genus Laccodytes Régimbart, 1895 (Coleoptera: Dytiscidae)
FIGURES 44–47. Male genitals in Laccodytes species: 44) L. apalodes: a) median lobe of aedeagus in lateral view, b–c) right and left parameres; 45) L. rondonia: idem; 46) L. americanus: idem; 47) L. phalacroides: a) apical half of median lobe of aedeagus in dorsal view, b) median lobe in lateral view, c–d) right and left parameres;
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Annotated Behaviour and Observability Dataset (ABODe)
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