The original description of the genus can be found at:
Life history
Nothing is known about the biology of the members of this genus. As is true of most members of the Pyramidellidaesensu lato, they are (were) most likely ectoparasites.
Hutton, F. W. (1886). "Mollusca". Zoological Record. 1885: 106 pp.
Laws, C. R. (1941). "Review of the Tertiary and Recent Neozelandic Pyramidellid Molluscs. No. 8. The Pyrgunillid genera and the genus Evalea". Transactions and Proceedings of the Royal Society of New Zealand. 71 (1): 6–22 + plates 1–2.