Characteristic traits, all apomorphies, are perichaetine setae, tubulo-racemose prostates, avesiculate meroic nephridia and opisthogastry (the development of intestinal gizzards, which in this genus are multiple in the region of segments 20–26).

block + -head → blockhead

Keller, the first woman to be granted tenure at Princeton, is one of a small but growing number of professors emeritae.

There is the absolute essentiability of collective action if we are to conserve the industry and temper this competition, which means the ruination of industry, if we are going to survive.