Ancillista ngampitchae is a species of sea snail, a marine gastropod mollusk in the family Ancillariidae.

nov. is described trawled from 70 to 100 m in the Arafura Sea between the northern part of Australia and Indonesia by a Thai trawler.

Introduction During approximately the last ten years, bilateral fishing concessions between Thailand and countries in the region have expanded.

Thai trawlers have been a major source of molluscan specimens from the deep sea from various locations around the region.

Rare species have shown up in the dredging, including Volutoconus bednalli, Lyria kurodai, etc.

During dredging, these small fragile shells can easily pass through the net or break into pieces and get lost in the very deep sea before they can be brought up to the surface.

The reason to support this assumption is that the body of the shell is clean white with no trace of mud on the shell surface, as opposed to species dredged from deep muddy bottoms such as Zidona dufresnei Donovan, 1823 in the family Volutidae.

Between the solid white stripe and the whorl, there is a narrow shallow groove running parallel with it.

There are two deep narrow channels running parallel on the solid white base callus.

nov. is smooth, semiglossy, but by using a magnifying glass, very fine vertical ribs are visible on the body whorl.

Type Locality 70–100 meters deep in the Arafura Sea between the northern part of Australia and Indonesia.

L/W=1.923; W/L=0.52; preserved in the collection of the Phuket Marine Biological Center (PMBC) with the code number PMBC-16013.

nov. is most closely related to Ancillista lineata Kiener, 1844 and Ancilista fusiformis Petterd, 1886.

Ancillista lineata Kiener, 1844 is cream, the spire callus on the apex is sometimes yellow.

Ancilista fusiformis Petterd, 1886 is slender, with light cream-brown coloring on the body with a white stripe at the suture.

Locality: Arafura Sea, between the northern part of Australia and southern Indonesia, west of Irian Jaya.

Central area of the whorl covered with faint light brown zigzag axial lines.