Lyroda
Say, 1837
square-headed wasps, cricket hunters
Lyroda is a of solitary, square-headed in the Crabronidae. The genus contains at least 26 described , with most diversity occurring in Southeast Asia, Africa, Australia, and South America; one species, L. subita, is widespread in North America. Females are specialized hunters of and related , provisioning underground nests with paralyzed for their .
Pronunciation
How to pronounce Lyroda: //laɪˈroʊdə//
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Distinguished from the similar Liris by the presence of large (adhesive foot pads) on the ; Liris has small, inconspicuous foot pads. Lyroda possesses three well-developed , whereas Liris has only a single mid-ocellus with the ocelli reduced to longitudinal scars. The square shape separates both genera from other crabronid .
Images
Appearance
-sized with a distinctive square or rectangular shape. Body typically slate gray with silver highlights, sometimes appearing banded on the in certain lighting. present as three on the crown of the head between the . bear notably large (adhesive pads) on the final , a diagnostic feature distinguishing Lyroda from similar such as Liris. Females of L. subita range 10–13 mm in body length, males 6–10 mm.
Habitat
Found in diverse terrestrial including yards, fields, and stream banks. Nests are constructed in soil, typically 15–30 cm below the surface. Some occupy damp situations near water where or occur.
Distribution
Widespread globally: L. subita occurs throughout most of the United States (excluding Washington, Oregon, and southwestern states), southern Canada, northern Mexico, Cuba, and Hispaniola. The majority of (21+) are distributed in Southeast Asia, with additional species in Africa, Australia, and South America. Records also exist from Vermont.
Diet
are not described; are provisioned with paralyzed . L. subita primarily hunts ( ), including both adults and . At least one observation documents use of (), and other Lyroda are known to use ().
Host Associations
- Gryllidae - primary and paralyzed and provisioned in nests
- Tridactylidae - occasional Documented in at least one nest of L. subita in upstate New York
- Tetrigidae - Used by other Lyroda outside North America
Life Cycle
Solitary nesting with underground burrows containing one or two . Females provision each cell with multiple paralyzed , lay a single on the final item, and seal the cell. Developmental stages include egg, , , and , though specific timing is undocumented.
Behavior
Females are solitary nest builders. Nest construction method is debated: some individuals excavate burrows themselves, while others have been observed using abandoned burrows of other solitary . Hunting involves subduing with a paralyzing to nerve centers. Transport of bulky is accomplished by grasping the in the and slinging the prey beneath the body; the wasp can run, glide, or while carrying prey. Multiple crickets are stored per before .
Ecological Role
of and related ; control of these . Serves as for potential nest , though specific are not documented.
Human Relevance
Not considered economically significant. May contribute to of in residential and agricultural settings. are not reported as a concern.
Similar Taxa
More Details
Nest site flexibility
The degree to which Lyroda excavates its own burrows versus usurps existing cavities remains unresolved and may vary by individual or locality.
Host switching
The use of () by L. subita and () by other Lyroda suggests potential flexibility in selection based on availability, though remain the primary .