Phyllophaga zavalana
Reinhard, 1946
Zavala Phyllophaga
Phyllophaga zavalana is a of scarab beetle in the Scarabaeidae, Melolonthinae. It is one of several flightless species within the large Phyllophaga, which contains over 400 North American species. P. zavalana is restricted to Texas and closely resembles P. cribrosa and P. epigaea, differing primarily in the absence of distinct longitudinal elytral furrows.
Pronunciation
How to pronounce Phyllophaga zavalana: //ˌfɪloʊˈfeɪɡə ˌzævəˈlænə//
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Distinguished from the very similar P. cribrosa by the absence of distinct longitudinal elytral furrows on the . Separated from P. epigaea, another flightless , by geographic range and subtle morphological differences. As with most Phyllophaga , definitive identification may require examination of male and female genitalia.
Appearance
are oval, convex, and shining black in coloration. The body surface is cribrose (perforated like a sieve). are 10-segmented. The lack the distinct longitudinal furrows present in the closely related P. cribrosa. Adults are flightless, with reduced wings.
Habitat
Occupies dry grassland and prairie . Associated with former grassland environments that have been converted to agricultural use.
Distribution
to Texas, United States. Restricted to the southern Great Plains region.
Diet
Larvae feed on roots of grasses and other plants. feed on low vegetation.
Life Cycle
Complete with , larval, pupal, and stages. Larvae are subterranean "white " that feed on roots. Adults are flightless and ground-dwelling.
Behavior
are and flightless, crawling on the ground and clinging to low vegetation. Limited ability due to flightlessness.
Ecological Role
Larvae function as root herbivores in grassland . are prey for various . Larvae are parasitized by such as Pelecinus polyturator and Myzinum .
Human Relevance
Occasionally considered a pest of crops, particularly when new plantings occur in former grasslands, due to the limited abilities of flightless .
Similar Taxa
- Phyllophaga cribrosaVery similar flightless distinguished by distinct longitudinal elytral furrows; occurs in Oklahoma and adjacent areas rather than Texas
- Phyllophaga epigaeaAnother flightless, black, cribrose restricted to Texas; lacks elytral furrows like P. zavalana but separated by subtle morphological differences
More Details
Taxonomic Complexity
identification within Phyllophaga is notoriously difficult, with over 400 North American species. P. zavalana is one of the few species that can be identified with reasonable confidence without genitalia examination due to its distinctive combination of flightlessness, cribrose surface, shining black color, lack of elytral furrows, and restricted Texas range.
Conservation Implications
The flightless nature of P. zavalana makes vulnerable to local extinction when grassland are converted to intensive agriculture, as recolonization of disturbed areas is severely limited.