Architectonica trochlearis

The diameter of the shell attains 40 mm.

(Original description in Latin) The shell is orbiculato-conoidal (with a conical spire but a rounded, almost disc-like base) and is somewhat depressed. The whorls are somewhat swollen. The whorls of the spire are longitudinally folded (plicate), while the body whorl is smooth. They are divided superiorly by a single groove. The uppermost area is banded with dark-brown, and it is encircled below with quadrate dark-brown spots. It is keeled at the periphery and articulately ornamented with white and dark-brown spots. The base is a little swollen. The umbilicus is large and wide-open, possessing somewhat acute brown crenations.^[2]

This marine species can be found off East Asia and Southeast Asia (Japan, China, the Philippines); East Africa, the Red Sea and Australia (Northern Territory, Queensland)

• Bieler, R. (1993). Architectonicidae of the Indo-Pacific (Mollusca, Gastropoda). Abhandlungen des Naturwissenschaftlichen Vereins in Hamburg. NF. 30: 1–376.
• Liu, J.Y. [Ruiyu] (ed.). (2008). [Checklist of marine biota of China seas]. China Science Press. 1267 pp.

Wikimedia Commons has media related to Architectonica trochlearis.