They emerge as flying adults in spring and summer, and can often be drawn to lights at night.

They are crawlers and can move quickly. In still water, no water moves over their gills, so they move their bodies up and down to keep oxygen flowing over them. They are engulfer-predators. They consume all types of invertebrates. Very young larvae are collector-gatherers.

Larvae are mostly small- to medium-sized stoneflies, which usually have distinctive patterns dorsally. They lack the thoracic gills of the similarly shaped and patterned larvae of Perlidae. The metathoracic wing-pads are divergent and the abdomen is rather elongate (Fig. 48).

Nov 8, 2011 · "A close-up view of the tip of the abdomen is often the best way to determine genus (and perhaps species). A dorsal view of the terminalia is probably best for males, and a ventral view of the last few abdominal segments is best for females." --Lloyd Gonzales.

In this study an additional association and description was made for the larva of Perlesta adena Stark, 1989. The pigment pattern of the larva is characterized by a distinct pale M-line on the …

Sep 1, 2024 · The larva was classified within the family Perlidae based on distinctive morphological traits, including toothed lacinia and sharp-cusped mandibles, slender palps, glossae shorter than rounded paraglossae, and highly branched gills on the sides and ventral surface of thoracic segments.

The larvae of the Perla is found in clear, rocky streams, where they live on the underside of the loose stones in the running water. The larvae may be found by taking a loose rock from the stream and looking on its under side, where they will appear as small, shrimp like objects, from ¼ inch to 1 ½ inches in length, and of a dark brown color.

Mar 1, 2024 · The larvae of K. petasus and N. tuberculata share typical diagnostic morphological characters of the family Perlidae. Specifically, they possess highly branched filamentous gills on the sides and venter of the thorax, as well as much longer paraglossae than glossae (Stewart & …

Cordulegastridae View genus Cordulegaster Corduliidae View genus Epitheca Gomphidae View genus Lanthus Ophiogomphus Lestidae View genus Lestes Libellulidae View genus Libellula Plecoptera “Stoneflies” View family Capniidae View genus Allocapnia Chloroperlidae View genus Alloperla Leuctridae View genus Leuctra Nemouridae View genus ...

Plecoptera larvae are almost exclusively found in running waters and they reach their greatest diversity in small cold streams. Plecoptera are the most sensitive order of aquatic insects and many species are restricted to habitats with high levels of dissolved oxygen.