Regularity: Regularly occurring
Type of Residency: Year-round
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.
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.
Habitat Type: Terrestrial
Comments: Habitat not really known, but undoubtedly some sort of shrubby or wooded terrainand the foodplant is also unknown.
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.
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).
National NatureServe Conservation Status
Rounded National Status Rank: N3 - Vulnerable
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.
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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