Pterospoda nigrescens

(Hulst, 1898)

Pterospoda nigrescens is a small geometrid with a wingspan of approximately 24 mm, distributed across arid regions of the southwestern United States and northern Mexico. The exhibits patterns with primary activity periods in April and August in Arizona. Larvae have been successfully reared on Condalia species, specifically Condalia warnockii var. kearneyana, indicating a specialized relationship with this shrub .

Pronunciation

How to pronounce Pterospoda nigrescens: /tɛroʊˈspoʊdə nɪˈɡrɛsɛnz/

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

Identification

Distinguished from other Pterospoda and similar geometrids by its occurrence in arid scrub and open woodland at moderate elevations across its specific geographic range. The pattern with peaks in April and August may aid in identification timing. Definitive identification requires examination of genitalic or molecular analysis.

Appearance

Small with wingspan approximately 24 mm. Detailed morphological description not available in sources.

Habitat

Arid scrub and open woodland at moderate elevations. Associated with plants in the Condalia, specifically Condalia warnockii var. kearneyana.

Distribution

Southwestern North America: south-eastern Arizona, Edwards Plateau of west-central Texas, south to at least Durango, Mexico. Expected but not confirmed in New Mexico.

Seasonality

with at least two periods. Primary activity in April and August in Arizona. Flight timing may vary across the geographic range.

Diet

Larvae feed on Condalia , specifically Condalia warnockii var. kearneyana (Rhamnaceae). feeding habits unknown.

Host Associations

  • Condalia warnockii var. kearneyana - larval Confirmed through rearing
  • Condalia - larval -level association

Life Cycle

with two per year. Detailed developmental stages and strategy not described in available sources.

Ecological Role

Herbivore in larval stage, consuming foliage of Condalia shrubs. Role in as prey for not documented.

Human Relevance

No documented economic or cultural significance. Potential interest for lepidopterists and conservation biologists monitoring arid land .

Similar Taxa

  • Other Pterospoda speciesCongeneric may overlap in range; identification requires detailed morphological examination
  • Other Ennominae geometrids in arid SouthwestSimilar preferences and periods; genitalic dissection typically required for definitive identification

More Details

Taxonomic History

Originally described as Selidosema nigrescens by Hulst in 1898, later transferred to Pterospoda.

Collection and Observation

210 observations recorded on iNaturalist as of source date, indicating moderate detectability by observers familiar with the .

Tags

Sources and further reading