securiform

“-- "Ears oval, with many distinct folds, naked except at the base; tragus securiform; fur thick, close, fuscous-black; or dark fuscous-brown above; beneath paler, except on the throat, the hairs being conspicuously tipped with grey, the upper hairs being all white at their base; face nude, and the membrane dark brownish-black" (_Jerdon_).”

Natural History of the Mammalia of India and Ceylon

“Megamerus "has an affinity to Sagra, but differs from that genus in having setiform antennae, porrect mandibles, and securiform palpi, its habit is also totally different, and more like that of some of those insects which belong to the heterogeneous magazine called Prionus; it is undoubtedly the most singular and novel form in Captain King's collection.”

Journals of Two Expeditions of Discovery in North-West and Western Australia, Volume 2

“Body black; antennae piceous, dull honey-yellow towards the tip, distinctly compressed; — joints, in profile a little narrowed to the base; palpi piceous, not at all securiform, terminal joint less dilated at tip than tiiat of the preceding joint; thorax with a slight pearlaceous re - flection, rather narrower at tip than at base; lateral margin depressed,”

Internet Archive: Transactions of the American Philosophical Society