list of species keys home help

gigantic shieldback

Aglaothorax giganteus (Rentz and Birchim 1968)

icon map for aglaothorax giganteus      
map      
10 s of calling song and waveform. Inyo County, California; 25.0°C. JCR08LO-03.
waveform for Aglaothorax giganteus
Group species: Ovatus.
Song: Loud song with frequently repeated echemes. Pulse trains 60±20 ms in length are repeated at a rate of 9.52±0.88 s-1. Mean peak frequency is 12.26±3.41 kHz, with peak frequencies as high as 19.46 kHz. Echemes group 2–6 (mean 3±1) pulse trains with 0.79–3.02 (mean 1.88±0.64) s and silent intervals between echemes.
Identification: Coloration
Abdomen
A. giganteus, red-brown middorsal abdominal stripe.
A. gurneyi, unstriped abdomen.

Tegmina
A. giganteus, white.
A. gurneyi, brown.

Pronotal disk
A. giganteus, abundant longitudinal black streaks on disk. No broad white longitudinal stripes.
A. armiger and A. tinkharmorum, reduced black streaking on disk.
A. ovatus, broad white longitudinal stripes.

Morphology
Body size
A. giganteus, male pronotum 14-15 mm long, a size range beginning at the maximum size of male A. ovatus.
Female body size overlaps with A. ovatus, but A. ovatus' ovipositor tends to be longer than the hind femur.

Male paraproct processes
A. giganteus, heavy, subapical, ventrally directed tooth.
A. segnis and A. strobilion, apical mesally directed tooth.

Pronotum
A. giganteus, heavily and irregularly rugose on prozona.
A. tinkhamorum, prozona similar to A. giganteus but appears warty rather than wrinkled.

See Key to Aglaothorax species.
Range: Eastern Sierra Nevada at moderate to high elevations.
Habitat: Desert scrub and pinyon-juniper woodland. Taken from big sagebrush (Artemisia tridentata), crucifixion thorn (Castela emoryi), singleleaf pinyon (Pinus monophylla), and stansbury cliffrose (Purshia stansburiana). Inhabits elevations between 1500 and 2000 m.
Season: Summer through fall.
References: Cole et al. 2025
Cole et al. 2025 (Ovatus Group) pp. 16-38
Cole et al. 2025 (species pages) pp. 17 and 23-25
Nomenclature: OSF (Orthoptera Species File Online).
previous species next species