Leptochilodiscus punctulatus Rasetti, 1966, from the Late Lower Cambrian of New York State.

], is part of a trilobite faunule that was collected from limestone beds which form several outcrops in a hillside on Griswold farm, about 1 mile southeast of North Chatham, Columbia County, New York State, USA; the faunule is referred to as the Acimetopus bilobatus faunule after one of the most common and characteristic trilobites.

The Acimetopus bilobatus faunule is notable for the number and variety of trilobites of the family Eodiscidae.

11 a - c) was collected from the upper part of the Hells Mouth Formation, 16.5 m below the base of the overlying Trwyn y Fulfran Formation at Trwyn Carreg-y-tir (grid reference SH 2876 2402), Llŷn Peninsula, North West Wales .

The fauna is of late lower Cambrian age and falls within the upper part of the protolenid-strenuellid Zone of the Comley Series of British nomenclature.