Diagnosis of the Orphninae (based on the adult characters)

 

Mandibles with 2-4 scissorial teeth and a well developed mola; labrum and mandibles protruding past the clypeus and can be seen from above (except for South American Onorius, which has mandibles feebly or not visible from above).

Orphninae mandibles
 

 

Antennae 10-segmented with a 3-segmented club.

Orphninae Triodontus antennae
 

 

Scutellum well developed in winged species, reduced but distinct in wingless species.

triodontus hybalus scutellum
 

 

Wings with a distinct anal area.

Orphninae mandibles
 

 

Apex of the anterior tibia in males without a spur but normally with a few robust setae.

Triodontus itremoi fore tibia male
 

 

Anterior coxa with a longitudinal hollow on the anterior surface.

Triodontus itremoi fore coxa
 

 

Tarsi of all legs with 2 similar claws.

Orphnus claws
 

 

Middle and hind tibiae with 2 apical spurs.

Triodontus itremoi hind middle tibia
 

 

Second abdominal sternite with a sub-triangular to rounded plectrum on each side.

Triodontus itremoi plectrum
 

 

Dorsal surface of hind coxae with a flat stridulatory file basally.

Pseudorphnus stridulation file
 

 

Parameres symmetrical (except for a few species of Aegidinus).

Orphnus parameres
 

 

Bursa copulatrix sacciform, membranous. Accessory vaginal glands developed.

Aegidium bursa copulatrix
 

 

Spermatheca C-shaped, not sclerotized.

Aegidium spermathaeca
 

 

Abdomen with 2 sclerotized tergites (VII-VIII) and 6 sternites visible in situ (III-VIII).

Triodontus itremoi abdomen
 

 

Males of most species may have clypeal horn and prothoracic ridges.

Orphninae males armature
 

Last modified: 

12/25/2016 - 18:27