Inquisitor sterrha, common name the formidable turrid, is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae.
The length of this species is 39 mm, its diameter13 mm.
The body whorl contains in one specimen fourteen ribs, in another specimen seventeen ribs.
This marine species occurs in the Central Indo-West Pacific; the Gulf of Carpentaria, off Queensland, Australia; off the Philippines; southern Indonesia and southern Papua New Guinea.
- Watson, R.B. 1881. Mollusca of "H.M.S. Challenger" expedition. Parts VIII-X. Pleurotomidae. Journal of the Linnean Society of London, Zoology 15: 388–475
- Smith, E.A. 1884. Mollusca. pp. 34–116, 487–508, 657–659, pls 4–7. In, Report on the Zoological Collections made in the Indo-Pacific Ocean during the voyage of the H.M.S. 'Alert ' 1881-2. London : British Museum Trustees, printed by Taylor & Francis.
- Schepman, M.M. 1913. Toxoglossa. pp. 384–396 in Weber, M. & de Beaufort, L.F. (eds). The Prosobranchia, Pulmonata and Opisthobranchia Tectibranchiata, Tribe Bullomorpha, of the Siboga Expedition. Monograph 49. Siboga Expeditie 32(2)
- Rippingale, O.H. & McMichael, D.F. 1961. Queensland and Great Barrier Reef Shells. Brisbane : Jacaranda Press 210 pp.
- Powell, A.W.B. 1968. The Turrid shellfish of Australian waters. Australian Natural History 1 16: 1–6
- Coleman, N. 1975. What Shell is That? Sydney : Lansdowne Press 298 pp.
- Wells, F.E. 1994. A revision of the Recent Australian species of the turrid genera Inquisitor and Ptychobela. Journal of the Malacological Society of Australasia 15: 71–102
- Wilson, B. 1994. Australian Marine Shells. Prosobranch Gastropods. Kallaroo, WA : Odyssey Publishing Vol. 2 370 pp.