Aequispirella finlayi is a species of sea snail, a marine gastropod mollusc in the superfamily Seguenzioidea, currently unassigned to a family. The species is endemic to New Zealand, found in the Chatham Islands and off the northern coast of the North Island.
In the original description, Powell described the species as follows:
The holotype of the species measures in height and in diameter. The species has spiral threats that cross the whorls on the shell, with approximately 10 found on the penultimate whorl. Both the axials and spirals finish abruptly at the umbilicus. The umbilicus is narrow and deeply crescentic. Powell noticed similarities between the species and Aequispirella corula, but can be differentiated due to A. finlayi has more narrowly conical apical whorls, as well as fewer axial ribs and a much wider body-whorl. The species has a taller spire than A. enderbyensis.
A. finlayi was first described by A.W.B. Powell in 1933, using the name Brookula (Aequispirella) finlayi. The holotype was collected from a depth of off the coast of Owenga in the Chatham Islands by Powell himself in February 1933. Aequispirella, while originally a subgenus of Brookula, has been treated as a genus since at least 2009, after which the accepted name for the species became Aequispirella finlayi.
The species is endemic to New Zealand, found in the waters of the Chatham Islands, and off the coast of the northern North Island including ManawatÃÂwhi / Three Kings Islands to the northwest, and some areas of the west coast including Boulder Bay on the Manukau Harbour.
A. finyali is known to occur underneath rocks on shorelines, as well as areas further off the coast.