Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Calendar
Upcoming Events

Information, insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa


TaxonomyBrowseInfoImagesLinksBooksData
Photo#1380411
Timema - Timema nevadense - female

Timema - Timema nevadense - Female
Mt. Charleston, Spring Mts, Hwy 158 nr xing Hwy 157, Clark County, Nevada, USA
May 15, 2017

Images of this individual: tag all
Timema - Timema nevadense - female Timema - Timema nevadense - female Timema - Timema nevadense - female Timema - Timema nevadense - female

Bizarre "triple-triangular structure" here!
This appears to be an anomalous Timema female.

The ventral aspect of the terminalia seen here appears quite different from the norm for female Timema...in that there are three (rather than one) large, overlapping, and roughly distally-triangular structures.

From left to right: the first such structure is the subgenital plate, which appears as a single, somewhat-oval, undivided sclerite here. But the two remaining and more distal, long-triangular structures seem quite unusual to me. They appear to be divided mesially into two longitudinal, reflectionally-symmetric halves that are connivent (or fused?). Very strange!

For comparison with a more typical female, see the thumbnail images below showing: 1) the ventral shot here; and 2) the other female Martin posted from the McCullough Range just southeast of Las Vegas:

      1)
      2)

For context...as far as functionality goes, I believe the female's subgenital plate protects her internal genitalia. It is lifted and held out of the way during copulation...as illustrated in the two (clickable) thumbnail images below:

        Ken-ichi's 5th image    Ken-ichi's 4th image

...which come from Ken-ichi Ueda's iNat post here.

And the female's paddle-like lateral cerci are thought to be used, directly after egg-laying, to manipulate the egg by rolling it...together with a mixture of soil & the mother's feces...into a ball which is then placed in the soil. It's thought this is done to provide crypsis, reduce desiccation-stress on the egg, and perhaps transmit potential gut-flora symbionts for the future foliage-feeding larvae.

But it's a mystery to me what the origin and/or function may be for the two additional (and apparently anomalous) "triangular structures" in Martin's ventral image here? Perhaps one (or both) those two distal structures are normally shorter, and mostly hidden under the subgenital plate?

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.