Dytiscidae

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Kelly B. Miller - One of the best experts on this subject based on the ideXlab platform.

  • early burst in body size evolution is uncoupled from species diversification in diving beetles Dytiscidae
    Molecular Ecology, 2018
    Co-Authors: Aurelie Desamore, Kelly B. Miller, Benjamin Laenen, Johannes Bergsten
    Abstract:

    Changes in morphology are often thought to be linked to changes in species diversification, which is expected to leave a signal of early burst (EB) in phenotypic traits. However, such signal is rarely recovered in empirical phylogenies, even for groups with well-known adaptive radiation. Using a comprehensive phylogenetic approach in Dytiscidae, which harbours ~4,300 species with as much as 50-fold variation in body size among them, we ask whether pattern of species diversification correlates with morphological evolution. Additionally, we test whether the large variation in body size is linked to habitat preference and whether the latter influences species turnover. We found, in sharp contrast to most animal groups, that Dytiscidae body size evolution follows an early-burst model with subsequent high phylogenetic conservatism. However, we found no evidence for associated shifts in species diversification, which point to an uncoupled evolution of morphology and species diversification. We recovered the ancestral habitat of Dytiscidae as lentic (standing water), with many transitions to lotic habitat (running water) that are concomitant to a decrease in body size. Finally, we found no evidence for difference in net diversification rates between habitats nor difference in turnover in lentic and lotic species. This result, together with recent findings in dragonflies, contrasts with some theoretical expectations of the habitat stability hypothesis. Thus, a thorough reassessment of the impact of dispersal, gene flow and range size on the speciation process is needed to fully encompass the evolutionary consequences of the lentic-lotic divide for freshwater fauna.

  • higher level phylogeny of diving beetles coleoptera Dytiscidae based on larval characters
    Systematic Entomology, 2017
    Co-Authors: Mariano C. Michat, Yves Alarie, Kelly B. Miller
    Abstract:

    A comprehensive higher-level phylogeny of diving beetles (Dytiscidae) based on larval characters is presented. Larval morphology and chaetotaxy of a broad range of genera and species was studied, covering all currently recognized subfamilies and tribes except for the small and geographically restricted Hydrodytinae, where the larva is unknown. The results suggest several significant conclusions with respect to the systematics of Dytiscidae including the following: monophyly of all currently recognized subfamilies, although Dytiscinae when considered in a broad context is rendered paraphyletic by Cybistrinae; currently recognized tribes are monophyletic except for Agabini, Hydroporini and Laccornellini; inter-subfamily and inter-tribe relationships generally show weak support, except for a few well supported clades; three distinct clades are recognized within Dytiscinae [Dytiscini sensu lato (i.e. including the genera Dytiscus Linnaeus and Hyderodes Hope), Hydaticini sensu lato, and Cybistrini]; and recognition of Pachydrini as a distinct tribe. Other less robust results include: Methlini sister to the rest of Hydroporinae; relative basal position of Laccornini, Hydrovatini and Laccornellini within Hydroporinae; close relationship of Agabinae and Copelatinae; Matinae nested deep within Dytiscidae, as sister to a large clade including Colymbetinae, Coptotominae, Lancetinae and Dytiscinae sensu lato; the sister-group relationship of Agabetini and Laccophilini is confirmed. The results presented here are discussed and compared with previous phylogenetic hypotheses based on different datasets, and the evolution of some significant morphological features is discussed in light of the proposed phylogeny. All suprageneric taxa are diagnosed, including illustrations of all relevant synapomorphies, and a key to separate subfamilies and tribes is presented, both in traditional (paper) format and as an online Lucid interactive identification key.

  • review of the genus fontidessus miller spangler 2008 coleoptera Dytiscidae hydroporinae bidessini with description of four new species
    ZooKeys, 2014
    Co-Authors: Kelly B. Miller, Elizabeth T Montano
    Abstract:

    The genus Fontidessus Miller & Spangler, 2008 (Coleoptera: Dytiscidae: Hydroporinae: Bidessini) is reviewed. The genus now includes seven species with three previously described, and four new species described here: F. microphthalmus Miller & Montano, sp. n.; F. bettae Miller & Montano, sp. n.; F. christineae Miller & Montano, sp. n., and F. aquarupe Miller & Montano, sp. n. Each species is diagnosed and described, including the previously known species, based on new specimens and new information. Habitus, male genitalia and other diagnostic features are illustrated for each species. A key to the seven species is provided. Fontidessus species are unique to hygropetric habitats in the Guiana Shield craton of northern South American.

  • the diving beetle species hydrotrupes palpalis sharp 1882 coleoptera Dytiscidae
    Coleopterists Bulletin, 2012
    Co-Authors: Kelly B. Miller, Philip D Perkins
    Abstract:

    ABSTRACT The species Hydrotrupes palpalis Sharp is redescribed and its classification, natural history, and distribution reviewed. The species is compared with the only other species in the genus, Hydrotrupes chinensis Nilsson, from China. Hygropetric beetles are briefly discussed.

  • notation of primary setae and pores on larvae of dytiscinae coleoptera Dytiscidae with phylogenetic considerations
    Zootaxa, 2011
    Co-Authors: Yves Alarie, Mariano C. Michat, Kelly B. Miller
    Abstract:

    An analysis of the primary setae and pores of first instars of 13 species of Dytiscinae was performed to deduce the ancestral system of primary setae and pores of the head capsule, head appendages, legs, last abdominal segment and urogomphus. One hundred and thirty-one setae, 69 pores and three setal groups have been assigned to the ground-plan pattern of the dytiscine larva, 27 setae and 20 pores on the head capsule; 30 setae, 25 pores and three setal groups on the cephalic appendages; 51 setae and 18 pores on the legs; 15 setae and three pores on the last abdominal segment; and eight setae and three pores on the urogomphus. A hypothesis of the phylogeny of the tribes of Dytiscinae is presented on a cladistic analysis of first instar chaetotaxy characters conducted using the program TNT. All tribes of Dytiscinae were included with larger tribes represented by multiple genera. Our concept of the subfamily Dytiscinae as defined on the basis of first instar chaetotaxy was found separated into three distinct clades: (1) Cybistrini, (2) Dytiscini + Hyderodini, and (3) Aubehydrini + Hydaticini + Eretini + Aciliini. The proposed relationships of the tribes of Dytiscinae are ((Cybistrini + (Hyderodini + Dytiscini)) + (Aubehydrini + (Hydaticini + (Eretini + Aciliini)))). Characters useful for phylogenetic analysis of the subfamily are described and illustrated.

Zoltán Csabai - One of the best experts on this subject based on the ideXlab platform.

Anders N Nilsson - One of the best experts on this subject based on the ideXlab platform.

  • bayesian tests of topology hypotheses with an example from diving beetles
    Systematic Biology, 2013
    Co-Authors: Johannes Bergsten, Anders N Nilsson, Fredrik Ronquist
    Abstract:

    We review Bayesian approaches to model testing in general and to the assessment of topological hypotheses in particular. We show that the standard way of setting up Bayes factor tests of the monophyly of a group, or the placement of a sample sequence in a known reference tree, can be misleading. The reason for this is related to the well-known dependency of Bayes factors on model-specific priors. Specifically, when testing tree hypotheses it is important that each hypothesis is associated with an appropriate tree space in the prior. This can be achieved by using appropriately constrained searches or by filtering trees in the posterior sample, but in a more elaborate way than typically implemented. If it is difficult to find the appropriate tree sets to be contrasted, then the posterior model odds may be more informative than the Bayes factor. We illustrate the recommended techniques using an empirical test case addressing the issue of whether two genera of diving beetles (Coleoptera: Dytiscidae), Suphrodytes and Hydroporus, should be synonymized. Our refined Bayes factor tests, in contrast to standard analyses, show that there is strong support for Suphrodytes nesting inside Hydroporus, and the genera are therefore synonymized. (Bayes factor; Coleoptera; Dytiscidae; marginal likelihood; model testing; posterior odds; reversible-jump MCMC; stepping-stone sampling.)

  • world catalogue of Dytiscidae corrections and additions 3 coleoptera Dytiscidae
    Koleopterologische Rundschau, 2006
    Co-Authors: Anders N Nilsson
    Abstract:

    A third set of corrections and additions is given to the World Catalogue of Dytiscidae (NILSSON 2001) including the first and second sets of corrections and additions (NILSSON 2003 & 2004). Megadytes lherminieri (GUERIN-MENEVILLE, 1829) has priority over M. giganteus (LAPORTE, 1835). The species name Dytiscus silphoides P ONZA, 1805 is declared as a nomen oblitum, in order to ensure the continuous usage of its junior synonym Deronectes opatrinus (GERMAR, 1824) as a valid name (nomen protectum). The preoccupied name Hydroporus ruficeps A UBE, 1838 is replaced with Hydroporus pseudoniger nom.n. New taxa published before January 1, 2006 are added. The number of recent species of the family Dytiscidae is now 3959.

  • larval morphology of genus lancetes coleoptera adephaga Dytiscidae the hypothesis of sister group relationship with the subfamily dytiscinae revisited
    Canadian Entomologist, 2002
    Co-Authors: Yves Alarie, Miguel Archangelsky, Anders N Nilsson, Chris H S Watts
    Abstract:

    Descriptions of the larvae of Lancetes angusticollis (Curtis), L. lanceolatus (Clark), L. subseriatus Zimmermann, L. flavoscutatus Enderlein, L. delkeskampi ma, and L. nigriceps (Erichson) are provided. Characters from larval morphology are ana- lyzed to infer the phylogenetic relationships of the genus Luncetes Sharp with other genera of Dytiscidae. A parsimony analysis based on 51 informative larval charac- teristics was conducted with the program NONA. The most parsimonious tree sup- ports a sister-group relationship between the genus Lancetes and members of the subfamily Dytiscinae. The only unambiguous synapomorphy in support of this hy- pothesis is the secondary subdivision of some cephalic appendages. Other putative synapomorphies are the proximal articulation of the primary seta C07 both on meso- and meta-coxa and the presence of additional primary setae on the ventral margin of the tibiae. Based on several character states including the presence of multifragmented urogomphi, the genus Luncetes is monophyletic.

  • intraspecific variation and intersexual correlation in secondary sexual characters of three diving beetles coleoptera Dytiscidae
    Biological Journal of The Linnean Society, 2001
    Co-Authors: Johannes Bergsten, Anne Toyra, Anders N Nilsson
    Abstract:

    Intraspecific variation and intersexual correlation in secondary sexual characters of three diving-beetles (Coleoptera: Dytiscidae)

  • a new view on the generic classification of the agabus group of genera of the agabini aimed at solving the problem with a paraphyletic agabus coleoptera Dytiscidae
    Koleopterologische Rundschau, 2000
    Co-Authors: Anders N Nilsson
    Abstract:

    The generic classification of the Agabus-group of genera of the tribe Agabini (Coleoptera: Dytiscidae) is revised and presented as a checklist of the world species. In the new classification, the following six genera are recognized: Agabus LEACH, Hydronebrius JAKOVLEV, Hydrotrupes SHARP, Ilybius ERICHSON, Ilybiosoma CROTCH, and Platambus THOMSON. The concepts of Ilybius and Platambus have been expanded, and both genera now include additional species previously placed in Agabus. The genus Agabus is divided into the three subgenera: Agabus s.str., Acatodes THOMSON, and Gaurodytes THOMSON. The following new generic synonymies are given: Agabinus CROTCH, 1873, and Colymbinectes FALKENSTROM, 1936 = Platambus THOMSON, 1859; Carrhydrus FALL, 1922 = Agabus LEACH, 1817. Ilybius lenensis nom.n. is proposed as replacement name for /. aenescens POPPIUS, 1905.

Michael Balke - One of the best experts on this subject based on the ideXlab platform.

  • hydaticus prodaticus hauthi sp nov a new diving beetle from the cloud forest in the cordillera el sira peru coleoptera Dytiscidae
    Zootaxa, 2020
    Co-Authors: Lars Hendrich, Michael Balke
    Abstract:

    A new species of the genus Hydaticus Leach, 1817, subgenus Prodaticus Sharp, 1882 (Coleoptera: Dytiscidae) has been discovered in the mountains of Cerros del Sira, Peru. It is here described as Hydaticus (Prodaticus) hauthi sp. nov.. It is morphologically similar to the Peruvian H. panguana Megna, Balke, Apenborn Hendrich, 2019. The new species differs from H. panguana by its almost complete black dorsal surface and the shape of the median lobe. Diagnostic characters of both species, including illustrations of male genitalia and habitus, are presented, and a modified key for the 12 Neotropical species is provided.

  • 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
    Zootaxa, 2019
    Co-Authors: Yoandri S Megna, Michael Balke, Rico Apenborn, Lars Hendrich
    Abstract:

    We review the Peruvian Hydaticus Leach, 1817 (Coleoptera: Dytiscidae) and describe Hydaticus panguana sp. nov. from Huanuco Department. In the context of this work, we also provide new country records for several species: Hydaticus lateralis Laporte, 1835 (for Peru, Guyana, Venezuela, Suriname); H. xanthomelas (Brulle, 1837) (for Peru); H. subfasciatus Laporte, 1835 (for Colombia); H. fractivittis Guignot, 1951 (for Paraguay). Hydaticus riehli Wehncke, 1876 and H. verecundus Clark, 1864, described from “Cuba” and “South America”, respectively, were probably mislabelled specimens, and do not belong to the Neotropical fauna. Diagnostic characters, including illustrations of male genitalia and habitus, are presented for seven of the 11 Neotropical species, and a modified key is provided. Altogether four species of Hydaticus are now known from Peru.

  • status of japanese dytiscus species coleoptera Dytiscidae based on mitochondrial dna sequence data
    Entomological Science, 2012
    Co-Authors: Toshio Inoda, Michael Balke
    Abstract:

    We sequenced 628 base pairs of the mitochondrial cytochrome-c oxidase subunit 1 (cox1) gene to investigate the genetic differentiation among Japanese Dytiscus diving beetles (Coleoptera: Dytiscidae). Dytiscus beetles are a charismatic part of the fauna of lakes, ponds and swamps. Three species are known from Japan: D. dauricus Gebler, 1832; D. marginalis czerskii Zeitzev*, 1953; and D. sharpi Wehncke, 1875. Adults of D. sharpi collected in Chiba and Ishikawa Prefectures were morphologically highly similar, but here we found that they differed by 20 cox1 base pairs (3.18%). Our results imply that conservation strategies especially for Japanese D. sharpi sharpi and D. sharpi validus Regimbart, 1899 might need to be adjusted to address the presence of two evolutionarily significant units.

  • phylogeny and diversification of diving beetles coleoptera Dytiscidae
    Cladistics, 2008
    Co-Authors: Ignacio Ribera, Alfried P Vogler, Michael Balke
    Abstract:

    Dytiscidae is the most diverse family of beetles in which both adults and larvae are aquatic, with examples of extreme morphological and ecological adaptations. Despite continuous attention from systematists and ecologists, existing phylogenetic hypotheses remain unsatisfactory because of limited taxon sampling or low node support. Here we provide a phylogenetic tree inferred from four gene fragments (cox1, rrnL, H3 and SSU, � 4000 aligned base pairs), including 222 species in 116 of 174 known genera and 25 of 26 tribes. We aligned ribosomal genes prior to tree building with parsimony and Bayesian methods using three approaches: progressive pair-wise alignment with refinement, progressive alignment modeling the evolution of indels, and deletion of hypervariable sites. Results were generally congruent across alignment and tree inference methods. Basal relationships were not well defined, although we identified 28 well supported lineages corresponding to recognized tribes or groups of genera, among which the most prominent novel results were the polyphyly of Dytiscinae; the grouping of Pachydrini with Bidessini, Peschetius with Methlini and Coptotomus within Copelatinae; the monophyly of all Australian Hydroporini (Necterosoma group), and their relationship with the Graptodytes and Deronectes groups plus Hygrotini. We found support for a clade formed by Hydroporinae plus Laccophilini, and their sister relationship with Cybistrini and Copelatinae. The tree provided a framework for the analysis of species diversification in Dytiscidae. We found a positive correlation between the number of species in a lineage and the age of the crown group as estimated through a molecular clock approach, but the correlation with the stem age was non-significant. Imbalances between sister clades were significant for several nodes, but the residuals of the regression of species numbers with the crown age of the group identified only Bidessini and the Coptotomus + Agaporomorphus clade as lineages with, respectively, above and below expected levels of species diversity. � The Willi Hennig Society 2008.

  • the systematic position of aspidytidae the diversification of dytiscoidea coleoptera adephaga and the phylogenetic signal of third codon positions
    Journal of Zoological Systematics and Evolutionary Research, 2005
    Co-Authors: Michael Balke, Ignacio Ribera, Rolf G. Beutel
    Abstract:

    Characters of the newly discovered larvae of the South African Cliff Water Beetle Aspidytes niobe were examined and integrated into a data matrix including all families of Dytiscoidea as well as Haliplidae. Fifty-three morphological characters of adults and larvae were analysed separately and combined with molecular data from six nuclear and mitochondrial genes. The phylogeny of the group is reconstructed for the study of the evolution of swimming behaviour and larval feeding habits, as well as the shift in diversification rates leading to the two most speciose lineages. The parsimony analysis of all equally weighted morphological and molecular characters combined resulted in a single well supported tree with the topology (Noteridae (Hygrobiidae ((Aspidytidae, Amphizoidae) Dytiscidae))), in agreement with the molecular data alone, but in contradiction to the morphological data, which favoured a topology in which Hygrobiidae is sister to Dytiscidae. The exclusion of third codon positions of the three protein coding genes resulted in a topology identical to that obtained with the morphological data alone, but the use of Bayesian probabilities or the amino acid sequence resulted in the same topology as that of the tree obtained with parsimony using all equally weighted characters. We concluded that interactions of third codon positions with the other data are complex, and their removal is not justified. There was a significant increase in the diversification rate at the base of the richest families (Noteridae and Dytiscidae), which could be associated with the development of simultaneous stroke and higher swimming performance, although data on the swimming behaviour of some basal groups of Noteridae are incomplete. The presence of larval mandibular sucking channels may have contributed to the diversification of Dytiscidae and the species-rich noterid genera Hydrocanthus and Canthydrus.

Móra Arnold - One of the best experts on this subject based on the ideXlab platform.

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