The Experts below are selected from a list of 180 Experts worldwide ranked by ideXlab platform
Nils Møller Andersen - One of the best experts on this subject based on the ideXlab platform.
-
Fossil water striders in the Eocene Baltic amber (Hemiptera, Gerromorpha)
Insect Systematics & Evolution, 2020Co-Authors: Nils Møller AndersenAbstract:Water striders (Hemiptera, Gerromorpha) live on the surface film of freshwater. Adults are often flightless and therefore not prone to be caught in resin exuded by trees on land and subsequently preserved as amber inclusions. Nevertheless, a small number of gerromorphan bugs have so far been reported from Baltic amber. The present paper reports on eight species of Gerromorpha in the Eocene Baltic amber, describing Electrogerris kotashevichi gen. et sp. n. (Gerridae, Gerrinae), Succineogerris larssoni gen. et sp. n. (Gerridae, Gerrinae), and Balticovelia weitschati gen. et sp. n. (Veliidae, Veliinae) and redescribing Electrovelia baltica Andersen (Veliidae, Veliinae) and Metrocephala anderseni Popov (Hydrometridae, Hydrometrinae) based upon additional and better preserved specimens. Finally, the phylogenetic, palaeobiological, and biogeographic significance of these amber fossils are discussed.
-
mesoveliidae hebridae and Hydrometridae of australia hemiptera heteroptera gerromorpha with a reanalysis of the phylogeny of semiaquatic bugs
Invertebrate Systematics, 2004Co-Authors: Nils Møller Andersen, Tom A WeirAbstract:The semiaquatic bugs (Hemiptera : Heteroptera, infraorder Gerromorpha), comprising water striders and their allies, are familiar inhabitants of water surfaces in all continents. Currently, the world fauna has more than 1900 described species classified in eight families and 165 genera. A phylogenetic analysis using maximum parsimony was performed on a dataset comprising 56 morphological characters scored for 24 exemplar genera covering all families and subfamilies of Gerromorpha. The phylogenetic relationships found concur with those presented by Andersen (1982) except that the relationships between some subfamilies of Veliidae and Gerridae are unresolved. The Australian fauna of Gerromorpha comprises six families, 30 genera, and 123 species. One-third of the genera and more than 80% of the species are endemic to Australia. Previously, we have covered all Australian species of the families Gerridae, Hermatobatidae and Veliidae. The present paper deals with the families Hebridae, Hydrometridae, and Mesoveliidae. We offer redescriptions or descriptive notes on all previously described species, describe Mesovelia ebbenielseni, sp. nov. (Mesoveliidae), Austrohebrus apterus, gen. et sp. nov., and Hebrus pilosus, sp. nov. (Hebridae), and synonymise Hebrus woodwardi Lansbury, syn. nov. (Hebridae) and Hydrometra halei Hungerford and Evans, syn. nov. (Hydrometridae). We present keys for the identification of genera and species, and map the distribution of all species. We also give a key for the identification of the families of Gerromorpha known from Australia.
-
a fossil water measurer from the mid cretaceous burmese amber hemiptera gerromorpha Hydrometridae
Insect Systematics & Evolution, 2001Co-Authors: Nils Møller Andersen, David A GrimaldiAbstract:Semiaquatic bugs (Hemiptera: Gerromorpha) comprise about 1,800 extant species classified in eight families. So far, 38 fossil species belonging to six families have been described or recorded, most of Cenozoic age. Knowledge about the evolutionary history of the major groups of Gerromorpha is seriously hampered by the scarcity of well-preserved Mesozoic fossils, especially from the Cretaceous. The present paper reports on a well-preserved semiaquatic bug from amber collected in the northern part of Myanmar (Burma). The source of this fossiliferous amber was previously considered to be Eocene in age, but recent evidence indicates that it originated in the Middle Cretaceous (Turonian-Cenomanian), or 100-90 Ma. The fossil species is described as Carinametra burmensis gen. et sp. n. The presence of three pairs of cephalic trichobothria, a prolonged head, long slender antennae and legs, reduced wing venation, etc., places the fossil in the gerromorphan family Hydrometridae or water measurers. Other characters suggest a close relationship with the two extant genera of the most basal of the hydrometrid subfamilies, Heterocleptinae. We present and discuss the available evidence used in the dating of Burmese amber. Finally, we discuss the phylogenetic, paleobiological, and biogeographic significance of the new fossil.
-
Cladistic inference and evolutionary scenarios: Locomotory structure, function, and performance in water striders
Cladistics, 1995Co-Authors: Nils Møller AndersenAbstract:Abstract A research methodology that aims to reveal how historical changes in environmental conditions (or selective regimes) have shaped the adaptive evolution of clades is applied to the adaptive evolution of water striders and their allies (Hemiptera-Heteroptera, Gerromorpha), a group of semiaquatic insects which includes species that are conspicuously adapted to life on the surface film of water. Based upon reconstructed phylogenies for the higher gerromorphan taxa, the hypothesis that the hygropetric zone is the ancestral one is confirmed for the Mesoveliidae, Hebridae and the clade comprising the Paraphrynoveliidae, Macroveliidae and Hydrometridae, but not for the Hermatobatidae and Veliidae. There is no support for the hypothesis that the intersection zone was a sort of transitional zone during the ecological evolution of pleustonic bugs. It is shown that the unique morphological and behavioural traits of the most derived members of this group evolved after inferred historical changes in environmental conditions and therefore qualify as adaptations in the sense of Gould and Vrba (1982) , Coddington (1988) and Baum and Larson (1991) . Other predictions about the adaptive evolution of gerromorphan bugs do not pass the cladistic test. The study illustrates that cladistic inference is a valuable tool in clarifying and sharpening retrospective explanations of complex evolutionary scenarios.
Tom A Weir - One of the best experts on this subject based on the ideXlab platform.
-
mesoveliidae hebridae and Hydrometridae of australia hemiptera heteroptera gerromorpha with a reanalysis of the phylogeny of semiaquatic bugs
Invertebrate Systematics, 2004Co-Authors: Nils Møller Andersen, Tom A WeirAbstract:The semiaquatic bugs (Hemiptera : Heteroptera, infraorder Gerromorpha), comprising water striders and their allies, are familiar inhabitants of water surfaces in all continents. Currently, the world fauna has more than 1900 described species classified in eight families and 165 genera. A phylogenetic analysis using maximum parsimony was performed on a dataset comprising 56 morphological characters scored for 24 exemplar genera covering all families and subfamilies of Gerromorpha. The phylogenetic relationships found concur with those presented by Andersen (1982) except that the relationships between some subfamilies of Veliidae and Gerridae are unresolved. The Australian fauna of Gerromorpha comprises six families, 30 genera, and 123 species. One-third of the genera and more than 80% of the species are endemic to Australia. Previously, we have covered all Australian species of the families Gerridae, Hermatobatidae and Veliidae. The present paper deals with the families Hebridae, Hydrometridae, and Mesoveliidae. We offer redescriptions or descriptive notes on all previously described species, describe Mesovelia ebbenielseni, sp. nov. (Mesoveliidae), Austrohebrus apterus, gen. et sp. nov., and Hebrus pilosus, sp. nov. (Hebridae), and synonymise Hebrus woodwardi Lansbury, syn. nov. (Hebridae) and Hydrometra halei Hungerford and Evans, syn. nov. (Hydrometridae). We present keys for the identification of genera and species, and map the distribution of all species. We also give a key for the identification of the families of Gerromorpha known from Australia.
Felipe Ferraz Figueiredo Moreira - One of the best experts on this subject based on the ideXlab platform.
-
descriptions records and key to the hydrometra latreille 1796 hemiptera heteroptera Hydrometridae from colombia
Zootaxa, 2019Co-Authors: David Camilo Martinez, Ximena Alejandra Galindomalagon, Fredy Molano, Felipe Ferraz Figueiredo MoreiraAbstract:Hydrometra colombiana Martinez and Galindo-Malagon, sp. nov., H. tayrona Martinez and Galindo-Malagon, sp. nov., and H. quimbaya Martinez and Galindo-Malagon, sp. nov. are described and compared with congeners. Furthermore, the female of H. williamsi Hungerford & Evans, 1934 and the male of H. adnexa Hungerford & Evans, 1934 are described. New records from Colombia and a key to the species of Hydrometra Latreille, 1796 recorded from the country are presented.
-
Gerromorpha (Hemiptera: Heteroptera) of eastern Mato Grosso State, Brazil: checklist, new records, and species distribution modeling
Zootaxa, 2013Co-Authors: Karina Dias-silva, Felipe Ferraz Figueiredo Moreira, Nubia França Da Silva Giehl, Caroline Correa Nóbrega, Helena Soares Ramos CabetteAbstract:The infraorder Gerromorpha comprises semiaquatic bugs, most of which spend much of their lifetime on the water surface, between floating plants, or on the margins of water bodies. Based on literature and collections made on streams and lakes on municipalities of eastern Mato Grosso, Brazil, a list has been elaborated with 52 species, including several new records. Out of the recorded species, 26 belong to the family Veliidae, 20 to Gerridae, three to Hydrometridae, two to Mesoveliidae, and one to Hebridae. The modeling of the potential geographical distribution is also presented for the 20 species that have been recorded for the first time from the state.
-
a new hydrometra hemiptera heteroptera Hydrometridae from northeastern brazil with a key to the species recorded from the country
Zootaxa, 2013Co-Authors: Felipe Ferraz Figueiredo Moreira, Julianna Freires BarbosaAbstract:Hydrometra sapiranga sp. nov. is described, illustrated, and compared with similar species. An identification key to the species of Hydrometra recorded fromBrazil is also presented.
-
New distributional records of Gerromorpha Popov, 1971 (Insecta: Hemiptera: Heteroptera) from Cuba
Check List, 2012Co-Authors: Senén Muñoz Riviaux, Carlos Naranjo López, Felipe Ferraz Figueiredo MoreiraAbstract:Distributional records of fourteen species of Gerromorpha, belonging to the families Gerridae, Hebridae, Hydrometridae, Mesoveliidae, and Veliidae, are reported from Cuba. The following species are recorded for the first time from eastern Cuba: Rheumatobates clanis Drake and Harris, 1932, R. meinerti Schroeder, 1931, Trepobates pictus (Herrich- Schaffer, 1848) (Gerridae), Hydrometra australis Say, 1832 (Hydrometridae), and Platyvelia brachialis (Stal, 1860) (Veliidae).
-
New records and distribution expansions for Neotropical water-striders (Insecta: Heteroptera: Gerromorpha)
Check List, 2011Co-Authors: Felipe Ferraz Figueiredo Moreira, José Ricardo Inacio Ribeiro, Jorge Luiz Nessimian, M. M. Itoyama, M. M. U. Castanhole, Luis Lenin Vicente PereiraAbstract:Based on material from several collections, summarized distributions and new records are presented for selected Neotropical species of Gerromorpha of the families Gerridae ( Brachymetra albinervis albinervis , B. furva , B. lata , B. shawi , Cylindrostethus erythropus , C. linearis , C. palmaris , C. regulus , Halobatopsis platensis , Limnogonus aduncus aduncus , L. hyalinus , L. ignotus , L. profugus , L. recurvus , Neogerris lubricus , N. magnus , N. lotus , N. visendus , Ovatametra gualeguay , Rheumatobates crassifemur crassifemur , R. c. esakii , Tachygerris adamsoni , T. celocis and T. surinamensis ), Hydrometridae ( Hydrometra guianana and H. sztolcmani ) and Mesoveliidae ( Mesovelia amoena , M. mulsanti and Mesoveloidea williamsi ).
Jakob Damgaard - One of the best experts on this subject based on the ideXlab platform.
-
Evolution of the semi-aquatic bugs (Hemiptera: Heteroptera: Gerromorpha) with a re-interpretation of the fossil record
2020Co-Authors: Jakob DamgaardAbstract:The fossil history of semi-aquatic bugs (Gerromorpha) is reviewed in light of the many important recent records and new developments in our under- standing of the phylogeny of the group. Based on the age of its sister group, the Panheteroptera, the Gerromorpha probably extends back into the Triassic, even though the oldest fossil forms assigned to the group are dubious. The recent dis- covery of Cretogerris albianus Perrichot, Nel & Neraudeau, 2005 from the Lower Cretaceous shows that all families were present in the Mesozoic, and phylogenetic and biogeographic evidence suggest that most - perhaps all - extant subfamilies were also present at that time. By comparison, the fossil record of the families Hydrometridae and Gerridae is far richer than that of any other family, which allows a more detailed interpretation of the phylogenetic relationships among extinct and extant taxa of these two groups.
-
The water bugs (Hemiptera-Heteroptera: Gerromorpha & Nepomorpha) of New Caledonia: Diversity, ecology and biogeographical significance
2020Co-Authors: Jakob Damgaard, Herbert ZettelAbstract:La faune neo-caledonienne des punaises d'eau (Hemipteres-Heteropteres: Gerromorpha et Nepomorpha) est examinee et presentee dans une liste. La faune est tres diversifiee avec 35 especes decrites et quelques especes non decrites. Les especes pour environ leur moitie sont endemiques a l'ile principale, la Grande Terre et les iles environnantes et les recifs coralliens. Malgre sa petite taille et sa position isolee, la Nouvelle-Caledonie est habitee par des representants de la plupart des familles de punaises semi-aquatiques (Gerromorpha) - Mesoveliidae, Hebridae, Hydrometridae, Hermatobatidae, Veliidae et Gerridae. La faune des punaises aquatiques (Nepomorpha) est moins diversifiee et comprend des representants des Belostomatidae, Corixidae, Notonectidae, Ochteridae et Gelastocoridae. La plupart des especes appartiennent a des genres repandus, voire cosmopolite comme Mesovelia, Hebrus, Hydrometra, Hermatobates, Microvelia, Rhagovelia, Halovelia, Xenobates, Halobates et Limnogonus (Gerromorpha) et Lethocerus, Sigara, Ochterus, Nerthra, Anisops, Enithares et Paraplea (Nepomorpha). De nombreuses especes ne se trouvent que sur les iles environnantes tandis que d'autres sont largement distribuees dans la region du Pacifique occidental et au-dela. Trichocorixa verticalis verticalis Fieber, 1851 a probablement ete introduite a partir de l'Amerique du Nord pendant la Seconde Guerre mondiale. La plupart des nouvelles especes neo-caledoniennes de Nepomorpha vivent dans des habitats d'eau douce lentiques et lotiques mais certains Gelastocoridae et Ochteridae vivent dans des habitats terrestres humides. La majorite des nouvelles especes neo-caledoniennes de Gerromorpha se trouve egalement dans les habitats d'eau douce lentiques et lotiques, mais autant que 36% des especes sont presentes uniquement dans les milieux marins. Les membres des genres de mesoveliides Austrovelia et Phrynovelia se trouvent dans les milieux terrestres et humides sur les sommets des montagnes et peuvent etre particulierement interessants pour comprendre la biogeographie historique de la region qui est actuellement debattue.
-
Phylogeny of the semiaquatic bugs (Hemiptera-Heteroptera, Gerromorpha)
Insect Systematics & Evolution, 2020Co-Authors: Jakob DamgaardAbstract:The phylogeny of semi-aquatic bugs (Hemiptera-Heteroptera: Gerromorpha) was tested in parsimony analyses of 64 morphological characters and approximately 2.5 kb of DNA sequence data from the mitochondrial genes encoding COI+II and 16SrRNA and the nuclear gene encoding 28SrRNA. The taxon sample included representatives of all families and most subfamilies of Gerromorpha and a selection of outgroup taxa representing the two basal infraorders of Heteroptera, Enicocephalomorpha and Dipsocoromorpha, and two families of Nepomorpha. A simultaneous analysis (SA) of all data, and with gaps scored as fifth state characters, gave a single most parsimonious tree with all families resolved as monophyletic, except the Veliidae, where Microveliinae + Haloveliinae, Veliinae, Rhagoveliinae, Perittopinae, and Ocelloveliinae were resolved as successive sister groups to the Gerridae, thus confirming earlier statements about paraphyly of this family. The Gerridae + Veliidae clade was strongly supported, but otherwise only the Gerridae + Veliidae less Ocelloveliinae and the Gerridae itself had support. These three clades could all be diagnosed on apomorphic morphological characters, although no characters diagnosing the Gerridae were without convergences or present in all included taxa. While the Ocelloveliinae, Veliinae and Haloveliinae could not be diagnosed on convincing apomorphies, the Microveliinae + Haloveliinae, and their sister group relationship with the Gerridae, could be diagnosed on rather strong morphological synapomorphies, suggesting that Gerridae could be expanded to include these two veliid subfamilies, while Ocelloveliinae, and perhaps the remaining veliid subfamilies, could be elevated to new families. In Gerridae, the Ptilomerinae + Halobatinae was sister group to all other subfamilies, while the Rhagadotarsinae + Trepobatinae was sister group to a clade comprising the Gerrinae, Eotrechinae, Cylindrostethinae and Charmatometrinae. Most relationships in this clade were poorly supported and diagnosed, and Cylindrostethinae was surprisingly found to be paraphyletic. The sister group to the Gerridae + Veliidae clade was a strongly supported clade comprising the Paraphrynoveliidae and Macroveliidae, and this, and the lack of convincing synapomorphies for Paraphrynoveliidae, suggest that these two small families could be synonymized. For the basal relationships of Gerromorpha, the Mesoveliidae was strongly supported sister group to all other families, while the Hebridae, Hermatobatidae and Hydrometridae formed a poorly supported and poorly diagnosed sister group to the Gerridae + Veliidae + Paraphrynoveliidae + Macroveliidae clade. The unexpected sister group relationship between Hermatobatidae and Hydrometridae was moderately supported, and could be diagnosed on two synapomorphies, thus giving a new hypothesis about the relationships of these very divergent families. Phylogenetic analyses of individual character partitions gave less resolved and less supported relationships, and the mitochondrial genes COI+II and 16SrRNA contributed negative hidden partitioned Bremer support (HPBS) to the simultaneous analysis tree, probably due to homoplasy caused by saturation effects.
-
A surprisingly derived hydrometrid (Hemiptera, Gerromorpha) from the Crato Formation, Early Cretaceous of Brazil
Historical Biology, 2017Co-Authors: Rodrigo V. Pêgas, Maria E. C. Leal, Jakob DamgaardAbstract:AbstractIn the present paper, we review the fossil record of the Hydrometridae (Hemiptera, Gerromorpha) and present a new species from the Early Cretaceous Crato Formation of Northeastern Brazil, Christometra paradoxa gen. et sp. nov. This species is based on a new specimen (a female), as well as a previously figured one (a male), providing a rare case of preservation of sexually dimorphic features in the fossil record. This is the third species coming from this deposit, which is Aptian-Albian in age and the oldest deposit to have yielded hydrometrids so far. Only five other Mesozoic species are known, being slightly younger in age (Cenomanian). So far, phylogenetic analyses have recovered Cretaceous hydrometrids as basal relative to Cenozoic genera but, Christometra paradoxa exhibits several advanced characteristics that unite it in a clade together with the extant genera Hydrometra and Bacillometroides, in a more derived position than any previously known fossil hydrometrid.The present publication is re...
Antonio Arillo - One of the best experts on this subject based on the ideXlab platform.
-
the first water measurers from the lower cretaceous amber of spain heteroptera Hydrometridae heterocleptinae
Cretaceous Research, 2016Co-Authors: Alba Sanchezgarcia, Antonio ArilloAbstract:Abstract Two fossils belonging to a new genus and species of water measurer (Gerromorpha, Hydrometridae), Alavametra popovi Sanchez-Garcia and Nel gen. n., sp. n., are described as first definitive record of the family in Lower Cretaceous (upper Albian) amber from the Utrillas Group (Penacerrada I site) in Spain. Although several parts of the specimens are obscured due to preservation, a sufficient number of taxonomical characters are visible to consider adequate placement within Heterocleptinae, including the very long posterior pair of cephalic trichobothria inserted on tubercles and the preapical articulation between the first and second antennal segments. The new fossil taxon is included into a cladistic analysis with extinct and extant hydrometrids, and it results putatively basal among the subfamily Heterocleptinae, suggesting that this clade was already present 105 Ma ago.
