Avitomyrmex
... that of the three described species in the Eocene bulldog ant genus Avitomyrmex, one species is known only from worker caste individuals?
... that of the three described species in the <a href="./Eocene" id="mwBJM" rel="mw:WikiLink" title="Eocene">Eocene</a> bulldog ant genus <i id="mwBJQ"><b id="mwBJU"><a href="./Avitomyrmex" id="mwBJY" rel="mw:WikiLink" title="Avitomyrmex">Avitomyrmex</a></b></i>, one species is known only from worker caste individuals?