Flares do not know friend from foe and so illuminate both. Changes in wind direction can result in flare exposure of the attacker while defenders hide in the shadows.

This outcome certainly marks compound 2a as possessing a strong disilanide character.

We are synapsid tetrapods, a group of reptiles that almost went extinct 200 million years ago in competition with the better-designed dinosaurs.

A somewhat detailed, and largely innovative reconstruction of the groundplan of hexapod integumental structure has been worked out by Kukalova-Peck (1991, 1994, 1997, this volume).