Trichoptera: Brachycentridae of Gunnison County, ColoradoMicrasema bactroRoss 1938Updated 19 January 2026
TSN 116967 Good LinksPhotos, Map, Taxon Identifier Numbers - from the Global Biodiversity Information Facility Micrasema bactro at GBIFUniversity of Alberta Entomology Collection Species page Has illustration of male genitalia, description, habitat information, range and more. Photos, Map, Museums, DNA - Barcode of Life Data System ReferencesBalistrieri,LS; Mebane,CA and Schmidt,TS 2020 Time-dependent accumulation of Cd, Co, Cu, Ni, and Zn in mayfly and caddisfly larvae in experimental streams: Metal sensitivity, uptake pathways, and mixture toxicity. Science of the Total Environment, 732. htmlChapin,JW 1978 Systematics of nearctic Micrasema (Trichoptera: Brachycentridae). Ph.D Dissertation, Clemson University. Abstract: "Larvae of 14 Nearctic spp. of Micrasema are described to include one new species in the vusticwn group, all known eastern species, and four western species. Additional descriptions are given for two larvae which have not been associated with adult stages. Literature, distribution records, and biological notes on habitat, life cycle and case building behavior are given for the above larvae. New larval characters are provided which support the separate generic status of Amiocentrus and Micrasema. Keys are provided for Nearctic larvae and adult males of the latter genus. The status of adult male taxonomy is reviewed and M. etra is considered a nomen dubium. The validity of M. alexanderi is questioned. Characters observed in adult and immature stages, as well as previous literature illustrations are used to construct a most parsimonious cladogram of the family and genus, Lateral phallic parameres are reported in Amiocentrus aspilus and M. dimicki, placing the latter species at the base of the Micrasema lineage. The sprulesi and rusticum groups are shown to be sister lineages. Within the latter group at least three distinct lineages are inferred." DeWalt,RE; Stewart,KW; Moulton,SR and Kennedy,JH 1994 Summer emergence of mayflies, stoneflies, and caddisflies from a Colorado mountain stream. Southwestern Naturalist 39 (3) 249-256. PDF Dodds,GS and Hisaw,FL 1925 Ecological studies on aquatic insects. IV. Altitudinal range and zonation of mayflies, stoneflies and caddisflies in the Colorado Rockies. Ecology 6(4)380-390. PDF Ellsworth,SD 2000 Influence of substrate size, Cladophora, and caddisfly pupal cases on colonization of macroinvertebrates in Sagehen Creek, California. Western North American Naturalist, pp.311-319. PDF Abstract: "Colonization of stream macroinvertebrates onto artificial substrates was examined in Sagehen Creek California, during 1993. Substrate size and presence or absence of pupal cases of the caddisfly Anagapetus (Glossosmatidae) were examined as possible influences on macroinvertebrate colonization. Macroinvertebrates were collected from substrates after 60 d of incubation and identified to the lowest feasible taxonomie unit. Dry weight of the filametous green alga Cladophora also was determined for each substrate. A general linear model indicated a significant positive relationship between both substrate size and presence pupal cases on richness (P < 0.001). There was no significant effect of cases on the E5 evenness index, which supports the passive sampling model as a mechanism giving rise to the effect of cases on richness. A multivariate general linear model indicated a significant positive effect of Anagapetus cases on Micrasema bactro, Epeorus, and Rhyacophila sp and of substrate size on Hydropsyche occidentalis and Epeorus. Neither cases nor substrate size had a significant effect on Cladophora density (P > 0.05). There were significant negative correlations between Cladophora density and both Shannon H' and J' indices. There were significant positive relationships between Cladophora density with Baetis, Simulium, and Chironomidae density. Combined main effects of substrate size, Anagapetus pupal cases, and Cladophora have dynamic influences on this macroinvertebrate fauna. This study demonstrates the complex interplay of biotic abiotic factors that determine macroinvertebrate distribution and abundance in this system." Ross, HH 1938 Descriptions of Nearctic Caddisflies. Bulletin of the Illinois Natural History Survey 21:101-183. PDF First description of Micrasema bactro.  
Schmid,F 1983 Revision des trichopteres Canadiens. III. Les Hyalopsychidae, Psychomyiidae, Goeride, Brachycentridae, Sericostomatidae, Helicopsychidae, Beraeidae, Odontoceridae, Calamoceratidae et Molannidae. Memoires de la Societe Entomologique du Canada. Volume 125, 109 pages. Zuellig,RE; Heinold,BD; Kondratieff,BC and Ruiter,DE 2012 Diversity and Distribution of Mayflies (Ephemeroptera), Stoneflies (Plecoptera), and Caddisflies (Trichoptera) of the South Platte River Basin, Colorado, Nebraska, and Wyoming, 1873-2010. U.S. Geological Survey Data Series 606, 257 p. PDF - caution 46MB Quote from page : "Micrasema bactro was represented in the SPRB by few records. Larvae typically occur among root wads along the banks of small streams (Wiggins, 1996)." The elevation range is 7,300-8,550 feet and the adults emerge from July-August. |