Abstract
Abstract The life histories of Zealeuctra claasseni (Frison) and Zealeuctra hitei (Ricker and Ross) (Plecoptera: Leuctridae) were determined from observations and sampling on a Red River tributary in Cooke County, and N. Pecan Creek, Wise County, Texas, Dec., 1974‐June, 1978. Both species showed peak emergence when daily temperature was ca. 12°. Emergence was diurnal, with teneral adults and mating pairs found from dawn—late evening. Male‐female drumming signals were successfully recorded for both species. Incubation experiments at simulated stream temperatures indicated rapid embryonic development, so that larvae were visible through the chorion within ca. 4 weeks after deposition. Both species have highly flexible seasonal development patterns. Four types of life cycles seem possible, depending on field conditions: (1) slow univoltine, (2) fast univoltine, (3) slow semivoltine, and (4) fast semivoltine.
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