« Previous |
1 - 10 of 76
|
Next »
Number of results to display per page
Search Results
2. A morphological, anatomical and isozyme study of Potamogeton ×schreberi: confirmation of its recent occurrence in Germany and first documented record in France
- Creator:
- Kaplan , Zdeněk and Wolff , Peter
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- anatomy, clone, dispersal, distribution, electrophoresis, France, Germany, hybridization, isozymes, morphology, Potamogeton, relic, taxonomy, and vegetative propagation
- Language:
- English
- Description:
- A combined study of morphology, stem anatomy and isozyme patterns was used to reveal the identity of sterile plants from two rivers on the Germany/France border. A detailed morphological examination proved that the putative hybrid is clearly intermediate between Potamogeton natans and P. nodosus. The stem anatomy had characteristics of both species. The most compelling evidence came from the isozyme analysis. The additive “hybrid” banding patterns of the six enzyme systems studied indicate inheritance from P. natans and P. nodosus. In contrast, other morphologically similar hybrids were excluded: P. ×gessnacensis (= P. natans × P. polygonifolius) by all the enzyme systems, P. ×fluitans (= P. lucens × P. natans) by AAT, EST and 6PGDH, and P. ×sparganiifolius (= P. gramineus × P. natans) by AAT and EST. All samples of P. ×schreberi are of a single multi-enzyme phenotype, suggesting that they resulted from a single hybridization event and that the present-day distribution of P. ×schreberi along the Saarland/Moselle border was achieved by means of vegetative propagation and long-distance dispersal. Neither of its parental species occur with P. ×schreberi or are present upstream, which suggests that this hybrid has persisted vegetatively for a long time in the absence of its parents. The total distribution of this hybrid is reviewed and a detailed account of the records from Germany is given. P. ×schreberi appears to be a rare hybrid. The risk of incorrect determination resulting from the identification of insufficiently developed or inadequately preserved plant material is discussed.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
3. A review of the European planthopper genus Trirhacus and related taxa, with a key to the genera of European Cixiidae (Hemiptera: Fulgoromorpha)
- Creator:
- Holzinger, Werner E.
- Type:
- article, model:article, and TEXT
- Subject:
- Trirhacus, Sphaerocixius gen. n., Neocixius, Nanocixius, Apartus gen. n., Simplicixius gen. n., Sardocixius gen. n., rirhacus peloponnesiacus sp. n., Cixiidae, taxonomy, and morphology
- Language:
- English
- Description:
- Ten species of Cixiidae, formerly placed in Trirhacus Fieber, 1875, are redescribed and one additional species is described. They belong to seven genera: Trirhacus s. str. with T. setulosus Fieber, 1876 (type species), T. dubiosus Wagner, 1959, T. biokovensis Dlabola, 1971 and T. peloponnesiacus sp. n., Apartus gen. n. with A. michalki (Wagner, 1948) comb. n. (type species) and A. wagnerianus (Nast, 1965) comb. n., Nanocixius Wagner, 1939 stat. n. with N. discrepans (Fieber, 1876) comb. n., Neocixius Wagner, 1939 stat. n. with N. limbatus (Signoret, 1862) comb. n., Sardocixius gen. n. with S. formosissimus (Costa, 1883) comb. n., Simplicixius gen. n. with S. trichophorus (Melichar, 1914) comb. n. and Sphaerocixius Wagner, 1939 stat. n. with S. globuliferus (Wagner, 1939) comb. n. The phylogenetic relationships of these genera to other Cixiidae are briefly discussed and a key to the genera of European Cixiidae is provided.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
4. Afromontane Coelocorynus (Coleoptera: Scarabaeidae: Cetoniinae): Larval descriptions, biological notes and phylogenetic placement
- Creator:
- Šípek, Petr, Gill, Bruce D., and Grebennikov, Vasily V.
- Type:
- article, model:article, and TEXT
- Subject:
- Coleoptera, Scarabaeoidea, Cetoniinae, Valgini, Trichiini, Cryptodontina, Coelocorynus, larvae, morphology, phylogeny, Africa, Cameroon, and Mt. Oku
- Language:
- English
- Description:
- This paper reports the collecting of adult beetles and third-instar larvae of Coelocorynus desfontainei Antoine, 1999 in Cameroon and provides new data on the biology of this high-altitude Afromontane genus. It also presents the first diagnosis of this genus based on larval characters and examination of its systematic position in a phylogenetic context using 78 parsimony informative larval and adult characters. Based on the results of our analysis we (1) support the hypothesis that the tribe Trichiini is paraphyletic with respect to both Valgini and the rest of the Cetoniinae, and (2) propose that the Trichiini subtribe Cryptodontina, represented by Coelocorynus, is a sister group of the Valgini: Valgina, represented by Valgus. The larvae-only analyses were about twofold better than the adults-only analyses in providing a phylogenetic resolution consistent with the larvae + adults analyses. Only one of the ten clades was consistently supported by the analyses of both the larval and adult datasets, while the remaining nine were invariably strongly supported by one but not the other analysis, thus highlighting the importance of employing different data sources.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
5. Berchmansus elegans (Neuroptera: Chrysopidae): Larval and adult characteristics and new tribal affiliation
- Creator:
- Tauber, Catherine A., Tauber, Maurice , and Albuquerque, Gilberto S.
- Type:
- article, model:article, and TEXT
- Subject:
- Chrysopidae, Belonopterygini, larvae, adults, and morphology
- Language:
- English
- Description:
- The genus Berchmansus Navás, which was previously assigned to the tribe Leucochrysini, consists of three very rare species, all described from the Neotropics and all poorly known. Our report (1) provides the first description of a Berchmansus larva, the first instar of Berchmansus elegans (Guérin Méneville), (2) illustrates and redescribes the B. elegans adult, with emphasis on male and female genitalia, and (3) examines the larval and adult characters vis-à-vis the tribal affiliation of the genus. Given that the B. elegans adult and first instar share many apomorphies with other belonopterygine genera, this species belongs in the cosmopolitan tribe Belonopterygini, rather than the New World tribe Leucochrysini. Although Berchmansus larvae have not been collected in the field, we suspect that, like other belonopterygines, they are associated with ant nests. B. elegans exhibits a number of highly modified and unusual structures, some of which (#1 to #5) are not reported for any other chrysopids. Specifically: Males have (1) a unique, quadrate, dome-like hood above the gonarcus and (2) large, coiled parameres on the gonosaccus. First instars have (3) a greatly enlarged subapical seta on the flagellum, (4) a transverse row of long, hooked setae along the dorso-anterior margin of the pronotum, and (5) setose laterodorsal tubercles on the meso- and metathorax, with (6) multi-pronged, hooked setae.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
6. Bioacoustics and systematics of the Poecilimon heroicus-group (Orthoptera: Phaneropteridae: Barbitistinae)
- Creator:
- Heller, Klaus-Gerhard, Korsunovskaya, Olga S., Sevgili, Hasan, and Zhantiev, Roustem
- Type:
- article, model:article, and TEXT
- Subject:
- Orthoptera, Poecilimon, morphology, systematics, bioacoustics, Tettigonioidea, bush-crickets, communication system, and evolution
- Language:
- English
- Description:
- The species of the Poecilimon heroicus-group occur around the Caucasus (from north-eastern Turkey to south-eastern Ukraine). We describe the diagnostic morphological characters of all these species and the male calling song of three of the four species. Based on this data the following phylogenetic relationship is derived (P. tschorochensis (P. tricuspis (P. heroicus, P. bifenestratus))). Within the genus Poecilimon, the species can be recognised by a relatively wide pronotum and large tegmina. In one species, Poecilimon tschorochensis Adelung, 1907 (type species of the monotypic genus Artvinia Karabag, 1962, syn. n.; P. rammei Miram, 1938, syn. n.), the tegmina are very large and the song has unusually low spectral components. This species produced di-syllabic echemes at intervals of about 10 s. In two other species of the group, P. heroicus and P. bifenestratus, the calling song of males consists of an uninterrupted dense sequence of long syllables (syllable duration around 0.5 s; ca. 1 syllable/s at 20°C). In these species the auditory spiracles are reduced in size in both sexes, and the females have extremely small tegmina and are unable to respond to the male song acoustically, which would be typical for Phaneropteridae. The change in communication from acoustically responding to mute females has not been previously documented within a group of closely related species.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
7. Biology and immature stages of the clam-killing fly, Renocera pallida (Diptera: Sciomyzidae)
- Creator:
- Horsáková, Jana
- Type:
- article, model:article, and TEXT
- Subject:
- Sciomyzidae, Renocera pallida, clam-killing fly, rearing, life-cycle, egg, larva, puparium, and morphology
- Language:
- English
- Description:
- The larva of the Palaearctic Renocera pallida (Fallén, 1820) is confirmed as a predator of small species of bivalve molluscs of the family Sphaeriidae. To date only the larvae of three Nearctic Renocera species (and larvae of two other species of Sciomyzidae in two genera) are known to have the same food preference. The life cycle, biology, larval feeding and behaviour are described for the first time and compared with that of the Nearctic Renocera. The systematic position and biology of Renocera in general are discussed. Descriptions of the egg, second and third larval instars and the puparium of R. pallida are presented, the main features of the egg and larvae are illustrated by scanning electron micrographs.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
8. Blaena tamasi sp. n. from Western Australia, the first species of Cydnidae (Hemiptera: Heteroptera) with staphylinoid wing modification
- Creator:
- Lis, Jerzy A.
- Type:
- article, model:article, and TEXT
- Subject:
- Heteroptera, Cydnidae, Blaena, Australia, new species, morphology, wing modification, and key
- Language:
- English
- Description:
- Blaena tamasi sp. n., the first species of Cydnidae with staphylinoid modification of wings, is described from Western Australia. The rare cases of wing modifications in Cydnidae and Pentatomoidea are briefly discussed. A key to all known species of the genus Blaena Walker is also provided.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
9. Cleorodes Warren, 1894 does not belong in the tribe Boarmiini (Lepidoptera: Geometridae)
- Creator:
- Wiidalepp, Jaan, Tammaru, Toomas, Snäll, Niina, Ruohomäki, Kai, and Wahlberg, Niklas
- Type:
- article, model:article, and TEXT
- Subject:
- Taxonomy, morphology, molecular phylogeny, direct optimisation, Geometridae, Ennominae, Gnophini, Boarmiini, Bistonini, and Cleorodes lichenaria
- Language:
- English
- Description:
- The geometrid genus Cleorodes is shown to belong in the tribe Gnophini (sensu lato) and not in Boarmiini as previously assumed. The conclusion is based on an analysis of morphological characters of a number of genera in these tribes. Moreover, the result is unambiguously supported by a phylogenetic analysis of DNA sequence variation in three nuclear gene regions (segments D1 and D2 of 28S rRNA, and elongation factor 1α) and a mitochondrial gene, cytochrome oxidase-1. The phylogenetic hypothesis is based on a combined sequence data set, which was analysed using direct optimisation.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
10. Comparative study of head structures of larvae of Sphindidae and Protocucujidae (Coleoptera: Cucujoidea)
- Creator:
- Beutel, Rolf Georg and Ślipiński, Stanislaw Adam
- Type:
- article, model:article, and TEXT
- Subject:
- Cucujoidea, Sphindidae, Protocucujidae, larvae, morphology, and phylogeny
- Language:
- English
- Description:
- Selected representatives of Cucujoidea, Cleroidea, Tenebrionoidea, Chrysomelidae, and Lymexylidae were examined. External and internal head structures of larvae of Sphindus americanus and Ericmodes spp. are described in detail. The data were analyzed cladistically. A sister group relationship between Sphindidae and Protocucujidae is suggested by the vertical position of the labrum. The monophyly of Cucujiformia is supported by the reduced dorsal and anterior tentorial arms, fusion of galea and lacinia, and the presence of tube-like salivary glands. Absence of M. tentoriopraementalis inferior and presence of a short prepharyngeal tube are potential synapomorphies of Cleroidea, Cucujoidea and Tenebrionoidea. The monophyly of Cleroidea and Cucujoidea is suggested by the unusual attachment of the M. tentoriostipitalis to the ventral side of the posterior hypopharynx. Cucujoidea are paraphyletic. The families Endomychidae, Coccinellidae and Nitidulidae are more closely related to the monophyletic Cleroidea, than to other cucujoid groups. Separation of the posterior tentorial arms from the tentorial bridge and presence of a maxillolabial complex are synapomorphic features of Cleroidea and these cucujoid families. For a reliable reconstruction of cucujoid interrelationships, further characters and taxa need to be studied.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public