Creature:Petrasects

They say that you shouldn't judge a book by its cover; in few cases is this more true than with the pre-spaceflight Petrasects.

Biology and Physiology
Still confined to their rocky Homeworld of Almoetes, these insectoid individuals appear to be outright walking masses of stone at first glance, and it is only when their insides are made visible by some means that one realizes they merely have a set of natural granite fully-body armor-plating, similar somewhat to Earth's prehistoric placoderms.

Their smooth, domed heads appear entirely lacking in any means of vision, although removal of the particularly reflective plate covering their craniums reveals four fully-formed whiteless eyes; these eyes presumably operate using wavelengths to which the "visor-helmet" is designed to have glasslike transparency, with out eyes just happening to operate at wavelengths to which it is entirely opaque.

Analysis of their beartrap-like grins reveals that what appear at first glance to be external teeth are in fact sharpened extensions of their facial plates, also like some of Earth's placoderms. Behind these lie their true teeth, which are composed of titanium and affixed to a set of protrusile jaws. observation of their behavior reveals that eating is actually done purely with the faceplate pseudoteeth, their true teeth being instead used for speaking, digging, and fighting.

Behavior
The Petrasects are a primarily subterranean species, and digging is accomplished by locking their titanium teeth into a conical shape and rapidly projecting their jaws in and out of their heads with significant force, very similarly to Earth's jackhammers (they also employ a single-strike version of this maneuver when in weaponless combat with others of their kind, somewhat equivalent to the human punch).