Diplotaxis pubipes
Schaeffer, 1907
Hairy-footed Diplotaxis
Diplotaxis pubipes is a small scarab beetle in the Scarabaeidae, Melolonthinae. The was described by Schaeffer in 1907 and is known from the southern United States (Texas) and Mexico (San Luis Potosí, Tamaulipas, Veracruz). Like other members of the Diplotaxis, it is attracted to lights at night and has been observed congregating on low vegetation, presumably to detect trails of potential mates.
Pronunciation
How to pronounce Diplotaxis pubipes: //dɪpləˈtæksɪs ˈpjuːbaɪpiːz//
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
The can be distinguished from other Diplotaxis by the pubescent (hairy) that give it its name. Accurate identification to species level in this typically requires examination of genitalic structures. It is smaller than the rhinoceros beetles (Dynastinae) with which it sometimes co-occurs at lights, and lacks the prominent horns or enlarged of that group.
Appearance
Small scarab beetle. The specific epithet "pubipes" refers to hairy feet, a distinguishing characteristic of this . As a member of the ( Melolonthinae), it likely has the typical oval body shape and characteristic of scarab beetles, though specific morphological details distinguishing it from are not well documented in available sources.
Habitat
Arid and semi-arid environments including sand dune systems and open rangeland with mesquite (Prosopis glandulosa) and other desert scrub vegetation. In New Mexico and Texas, it has been collected in association with sandy and areas with recent rainfall that trigger insect .
Distribution
North America: United States (Texas). Central America/Mexico: San Luis Potosí, Tamaulipas, Veracruz. The spans the Nearctic and in the Chihuahuan Desert and adjacent regions.
Seasonality
Active during summer months, with observations in June and August. Activity appears triggered by rainfall events in otherwise drought-affected areas.
Behavior
Nocturnally active, attracted to blacklights and other artificial light sources. Has been observed congregating on low plants at night, a interpreted as "catching" trails to locate mates. This behavior has been documented in the Diplotaxis generally and specifically noted for D. pubipes in field observations from New Mexico and Texas.
Ecological Role
Member of the insect in desert and semi-desert . As a or root-feeder (typical of Melolonthinae larvae), the stages likely contribute to soil nutrient cycling, though specific ecological functions are not documented.
Human Relevance
Of minor interest to entomologists studying scarab beetle diversity in the Chihuahuan Desert region. Not known to be an agricultural pest.
Similar Taxa
- Diplotaxis spp.Other in the are similar in size and general appearance; D. pubipes is distinguished by its hairy and specific male genitalic structures.
- Xyloryctes thestalusThe rhinoceros beetle X. thestalus is much larger, with prominent horns in males, and co-occurs at lights in the same region but is easily distinguished by size and .
More Details
Taxonomic note
The epithet "pubipes" (hairy-footed) directly describes a key diagnostic character. The Diplotaxis is part of the tribe Diplotaxini within the Melolonthinae.
Field observations
In June 2018, D. pubipes was recorded from sand dune in southeastern New Mexico and west Texas during a collecting trip that documented its activity at lights and its of congregating on low vegetation.