摘要:

Kamimuria tibialis(Pictet, 1841) in the current sense includes two species, which agree with two forms distinguished by Kohno (1947). A neotype ofKamimuria tibialisis designated for stability of nomenclature and the other one of Kohno's forms is elevated to the rank of a species,K. uenoiKohno, 1947, stat. n. The penes of the two species are described and the males, females, nymphs and eggs are redescribed.

ISSN:0165-0424    

DOI:10.1080/01650429109361426

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The relationship between total length and four other dimensions was investigated for seven southeastern Australian species of Ephemeroptera belonging to the families Siphlonuridae, Ameletopsidae Oniscigastridae and Coloburiscidae. Of the twenty‐eight relationships investigated, only nine cases of isometry were found. In most cases, there was a change in the allometric relationship late in nymphal life. However, within a given species, this change did not occur at the same total body length for all of the dimensions investigated, indicating that it was not associated with nymphs passing from an immature to a mature stage as suggested by Clifford (1970).

ISSN:0165-0424    

DOI:10.1080/01650429109361427

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Response curves for the abundance value of chironomid species against water temperature were analyzed and optimum, tolerance, skewness and kurtosis calculated. The data base consisted of 127 taxa and 991 sites in running waters in Italy. Optimum temperature was calculated as weighted mean temperature, tolerance as weighted standard deviation, skewness and kurtosis as 3rd and 4th moment statistics respectively. Species were sorted according to optimum temperature. Most species are cold stenothermal and show tolerance for a narrow temperature range, very few species have a clearly plurimodal response. Cold stenothermal species have an optimum near their minimum tolerance value, warm water species have an optimum near their maximum tolerance value. The warm water species are more or less eurythermal. Lack of data prevents the demonstration of a relationship between thermal tolerance and the position of a species in the evolutionary tree, but the problem is worthy of further study.

ISSN:0165-0424    

DOI:10.1080/01650429109361428

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Dispersion patterns exhibited by a population of larvae of black flies consisting ofCnephia dacotensis(Dyar and Shannon) andSimulium rostratum(Lundström) are described. Groups of larvae of 5.venustumSay/verecundumStone and Jamnback, the species complex to whichS. rostratumbelongs, are known to exhibit a spaced dispersion pattern when found in groups consisting of only that species complex. Groups of only larvae ofC. dacotensis areknown to exhibit a banded or clumped dispersion pattern. When larvae ofC. dacotensisandS. rostratumwere found together they exhibited a spaced or a clumped dispersion pattern. Groups exhibiting a spaced dispersion pattern were found in microhabitats with lower water velocities (46.5 ± 4.6 cm s‐1), and with a lower percentage ofC. dacotensis(14.9%). Groups exhibiting a clumped dispersion pattern were found in microhabitats with higher water velocities (78.5 ± 5.2 cm s‐1), and with a higher percentage ofC. dacotensis(80.5%). It could not be determined if water velocity or percentC. dacotensisdetermined dispersion pattern. Bands formed by groups of onlyC. dacotensisare also described. These bands were perpendicular to the mean direction of flow, two to three larvae thick, and up to 30 cm long. They were 1.9 ± 0.16 cm ([xbar] ± S.E.) (n = 18) apart. The arrangement of bands on the substratum changed from day to day.

ISSN:0165-0424    

DOI:10.1080/01650429109361429

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Prymnopsella bucculatagen. n., sp. n. from mountain brooks of Sardinia is described in both sexes. The new genus is compared to the most closely related taxa,Sumatralbia rugosaViets andHexaxonopsalbia lautieni(Motas). General problems of the definition of genera in theAxonopis‐like water mites are discussed.

ISSN:0165-0424    

DOI:10.1080/01650429109361430

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Stempellinella reissisp. n. is described from the male imago and pupa. The imago has bare eyes, lacks pulvilli and scutal tubercle; anal point with longitudinal crest and spinules, and short gonostylus; all characteristic of the genusStempellinella.The species shows important similarities to the African speciesStempellina truncataFreeman 1957 in the hypopygium, and is notably different from the other European species of the genus.

ISSN:0165-0424    

DOI:10.1080/01650429109361431

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Aglymbus bimaculatussp. n., is described based on a large series of adults collected from the leaf axils of three species of bromeliads, in Salcsopolis, State of São Paulo, Brazil. The habitus and the male genitalia are illustrated. Comparisons with other similar species are provided. The available biological data are summarized.

ISSN:0165-0424    

DOI:10.1080/01650429109361432

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

ISSN:0165-0424    

DOI:10.1080/01650429109361425

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor