摘要:

The adults and egg ofHabrophlebia antoninoisp. n. are described and illustrated from material collected in southern Spain. Although the genitalia of the new species is characteristic ofHabrophlebia, the chorionic sculpturing of the egg and the shape and venation of hind wings are unique among European members of the genus. A discussion of its relationships with other European species ofHabrophlebiais included and a key to male imagines of European species ofHabrophlebiais provided.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200001)22:1;1-Z;FT001

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

ISSN:0165-0424    

DOI:10.1076/0165-0424(200001)22:1;1-Z;FT008

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

The larva ofRhoenanthus(Rhoenanthus)distafurcusBae et McCafferty, 1991 is described for the first time from specimens taken in southern Vietnam. Critical characters distinguishing it from other species of the family Potamanthidae are keyed and figured. Distribution ofR. distafurcusis summarized, including a list of 14 new occurrence records from Vietnam. Some aspects of its biology (habitat, larval habits, emergence and life cycle) are discussed.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200001)22:1;1-Z;FT009

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

ISSN:0165-0424    

DOI:10.1076/0165-0424(200001)22:1;1-Z;FT018

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Eggs ofPteronarcys californicaNewport were incubated at fixed temperatures between 5 and 20°C in the laboratory and at field temperatures in the Crowsnest River, Alberta. The regression of rate of development on temperature between 5–15°C gave a developmental zero of 3.125°C. Within the range 10–20°C, highest hatching success and fewest days to median hatch occurred at 15.0 or 17.5°C, but physiological time (day-degrees) for egg hatching increased with temperature throughout, markedly so above 15°C. A minimum of 182 days was required for 50% hatch in the laboratory, with no observable development for approximately 80 days. Eggs placed in the river on 25 May 1993 started to hatch on 17 October 1993, and the pulse of larval recruitment in the field population occurred between April and August, 11 to 15 months after oviposition. Eggs hatched over periods of 130–322 days at different temperatures in the laboratory, and over an 11-month period in the field. The placement of diapause early in embryonic development is suggested as a cause of extended recruitment. The variety of embryonic development in Plecoptera is briefly reviewed.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200001)22:1;1-Z;FT019

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

The last instar larva and the pupa ofPtilocolepus extensusMcLachlan, 1884, an endemic of the Iberian Peninsula, are described for the first time. The final instar larva ofPt. extensusbears close resemblance to those ofPtilocolepus granulatus(Pictet, 1834), but the abdomen has a well-developed dorsal sclerotized plate on segment VIII; this is a morphological feature which has not been observed in any other Ptilocolepinae. Final instar larvae make dorsoventrally flattened, elongate-oval cases of leaf pieces from several moss and liverwort species; such cases are characteristic of the Ptilocolepinae. Some additional data on biology and geographical distribution are given.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200001)22:1;1-Z;FT027

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

The diet of an undescribed species ofKamimuriawas investigated in Tai Po Kau Forest Stream, Hong Kong, by comparing larval gut contents with the array of available prey living on and among cobble substrates. Diets were dominated by chironomids and philopotamid caddisflies, with Baetidae, Heptageniidae, Hydropsychidae and Simuliidae comprising secondary dietary items. These six taxa made up 94% of the prey individuals eaten byKamimuria. Data analysis using a selectivity index revealed that these stoneflies fed indiscriminately, eating individual prey taxa in proportion to their availability in the environment. Large and smallKamimuriaexploited essentially the same prey. A comparison of the diet ofKamimuriawith the diets of four sympatric Odonata indicated that the degree of interspecific similarity was determined by the extent of overlap in microhabitat use. Diets ofEuphaea decorata(Zygoptera) larvae, which live under cobbles, were most similar toKamimuria. This is the first – albeit limited – study of the gut contents of a tropical Asian stonefly. The results suggest that these predators have the potential to limit benthic invertebrate abundance but, becauseKamimurialarvae feed unselectively, community structure may not be affected by their activities.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200001)22:1;1-Z;FT039

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Bryophaenocladius imberbussp. n.,B. mazumbaiensissp. n., andB. usambarensissp. n. are described and figured as male imago, based on specimens collected in the Usambara Mountains in NE Tanzania. All three species lack setae on squama.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200001)22:1;1-Z;FT048

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Under SEM the silk weave in the snail-like cases ofHelicopsyche crispataandH. shuttleworthi, the two species present in Italy consist of several types of meshes. The silk which connects the sand grains of the external wall is made up of multi-layered threads forming irregular meshes. The sand grains of the vertical pillars in the wall of the centr al columella are held together by very loosely woven silk and are supported by thick silken threads. The pupal silken membrane consists of concentric threads and the pupal case is attached to the substrate by a disordered mass of silken threads. The two glands which secrete the silk are long, double folded tubes.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200001)22:1;1-Z;FT058

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

The paper presents a re-description of the poorly known larva ofMetanoea flavipennisPictet, 1834. Information for the identification of this species is given, and the most important diagnostic features are illustrated. Some zoogeographical and ecological notes are added.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200001)22:1;1-Z;FT066

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor