Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

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Global Range: (250-20,000 square km (about 100-8000 square miles)) Datana diffidens has a range along the coast of South Texas from Refugio County south to the Rio Grande Valley and up the Rio Grande Valley to Zapata County (Dyar, 1917; Draudt, 1940; Opler, 2000b). There are no reports from Mexico, although it is very likely that it occurs on the south bank of the Rio Grande where suitable habitat exists.

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Physical Description

Type Information

Primary syntype for Datana diffidens Dyar, 1917
Catalog Number: USNM
Collection: Smithsonian Institution, National Museum of Natural History, Department of Entomology
Preparation: Pinned; Slide
Collector(s): K. Leffland
Year Collected: 1916
Locality: Victoria, Texas, United States
  • Primary syntype: Dyar, H. G. 1917. Insecutor Inscit. Menstr. 5: 67.
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Ecology

Habitat

Habitat Type: Terrestrial

Comments: Habitat not really known, but undoubtedly some sort of shrubby or wooded terrainand the foodplant is also unknown.

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Migration

Non-Migrant: No. All populations of this species make significant seasonal migrations.

Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).

Locally Migrant: No. No populations of this species make annual migrations of over 200 km.

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Trophic Strategy

Comments: Caterpillars were found feeding on oak at Victoria, Texas (Dyar, 1917). The only oak in this area is Live Oak (Quercus virginiana) (Opler, personal observation).

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N3 - Vulnerable

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NatureServe Conservation Status

Rounded Global Status Rank: G3 - Vulnerable

Reasons: Size of range, number of occurrences, threats from invasive grasses, and agricultral conversion of native habitats are the chief reasons for the rank.

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Threats

Comments: The moderate range is susceptible to stochastic events such as invasive alien plants, agricultural conversion, or inadvertent management actions that might be to the species' detriment. Lack of recent status information also contributes to potential threat. Invasive grasses noted as serious threats to habitat integrity in lower Rio Grande Valley (Opler, 2000c, personal observation in e-mail to ABI).

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