Nemognatha sparsa

LeConte, 1868

Nemognatha sparsa is a blister beetle in the Meloidae, first described by LeConte in 1868. Like other members of its , it belongs to the Nemognathinae, which is characterized by elongated mouthparts adapted for feeding on flowers. The is known from North America, with specimen records from museum collections in the western United States.

Blister Beetle by Hudsells. Used under a CC BY-SA 3.0 license.

Pronunciation

How to pronounce Nemognatha sparsa: /nɛmoʊɡˈneɪθə ˈspɑːrsə/

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Identification

Members of Nemognatha can be distinguished from other Nemognathinae by features of the mouthparts and body structure. Within the , N. sparsa is one of approximately 20+ North American . Identification to species level requires examination of specific morphological characters established in Enns's 1956 revision of the genus. The species name "sparsa" (meaning scattered or sparse) may refer to pattern elements or distribution.

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Habitat

Specimen records indicate association with shortgrass prairie and oak-pine-juniper woodland in the western United States. have been collected on yellow composite flowers (Asteraceae), including Xanthisma spinulosum (spiny goldenweed).

Distribution

North America. Documented from the western United States, including Oklahoma and surrounding regions. GBIF records confirm presence in North America.

Seasonality

have been observed in May, suggesting spring activity. This timing aligns with flowering of composite plants in prairie .

Diet

feed on pollen and nectar from flowers. Like other Nemognatha , nectar uptake occurs via capillary action along bristles of the elongated maxillary , not through sucking. The larvae are likely or in the nests of ground-nesting bees, as is characteristic of the Nemognathinae.

Host Associations

Xanthisma spinulosum - feeding sitespiny goldenweed, a yellow composite flower

Behavior

are flower visitors, using their elongated mouthparts to access nectar from composite flowers. The greatly elongated , which may be half the body length or longer, are adapted for reaching nectar in flowers with deep corollas.

Ecological Role

function as while feeding on pollen and nectar. The larval stage likely acts as a or of ground-nesting bees, potentially influencing .

Human Relevance

Like other blister beetles, N. sparsa contains , a defensive compound that can cause skin blistering upon contact. However, this is not known to be of significant agricultural or medical concern.

Similar Taxa

Nemognatha nigripennisSimilar size, coloration, and preference; both occur in western prairie habitats and visit yellow composite flowers. Distinguished by specific pattern elements and structural features of the mouthparts.
Gnathium speciesShares the Nemognathinae and similar elongated mouthpart for nectar feeding. Gnathium typically differ in body form and are often associated with different floral .

More Details

Mouthpart morphology

Nemognatha sparsa possesses the characteristic elongated maxillary of Nemognathinae. Wilhelm & Krenn (2012) demonstrated that these structures do not form a food canal for sucking; instead, nectar is transported via capillary action along bristles covering the galeae, with musculature around the mouth aiding the process.

Taxonomic history

The was described by John Lawrence LeConte in 1868. The Nemognatha was revised by W.R. Enns in 1956 (University of Kansas Science Bulletin 37:685–909), which remains the primary reference for North American species identification.