Chimarra

Stephens, 1829

Little Black Caddisflies

Species Guides

Chimarra aterrima(fingernet caddisfly)
Chimarra obscura(fingernet caddisfly)
Chimarra texana(Texas fingernet caddisfly)

Chimarra is a large of caddisflies (Trichoptera: Philopotamidae) containing more than 630 described . are commonly known as "little black caddisflies" due to their characteristic dark coloration. The genus has undergone extensive radiation, with species distributed across multiple continents including North America, South America, Europe, Africa, and Asia. Molecular studies have investigated the evolutionary history and biogeographic patterns of diversification within this genus.

Chimarra aterrima larva by Stroud Water Research Center. Used under a CC BY 3.0 license.

Pronunciation

How to pronounce Chimarra: //kɪˈmɑːrə//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

are distinguished from similar caddisfly by their small to medium size and predominantly blackish body and wing coloration. The combination of prominent maxillary and labial palps, lack of a coiled , and hairy (rather than scaled) wings separates them from superficially similar (Lepidoptera). Male genitalic characters, particularly the structure of IX and tergum X and the form of the phallotheca, are required for -level identification. Some species groups deviate from the typical black coloration; for example, the Chimarra lehibemavo species-group in Madagascar is characterized by large size and yellow coloration.

Images

Habitat

occupy lotic freshwater environments, primarily rivers and streams. The Chimarra lehibemavo species-group in Madagascar is restricted to rivers in eastern pristine rainforests.

Distribution

Widespread distribution across multiple continents including North America (documented from Missouri, Vermont), South America (Colombia: Antioquia, Chocó, Cundinamarca, Tolima, Magdalena), Europe, Africa (including Madagascar, where the lehibemavo -group occurs), and Asia. Individual species often have restricted geographic ranges.

Behavior

have been observed resting on foliage of shrubs alongside streams.

Similar Taxa

Lepidoptera (moths)Superficially similar resting posture and body form; distinguished by presence of scaled wings (vs. hairy), coiled (vs. prominent palps and chewing mouthparts), and different wing venation
Other Philopotamidae generaRequire examination of male genitalic characters for definitive separation; Chimarra typically recognized by characteristic blackish coloration in most

Misconceptions

are frequently mistaken for due to their similar appearance and resting on vegetation; the absence of a coiled and presence of hairy wings are key distinguishing features.