•
L. carinatus is found in the Upper Ordovician of the United States (Lower Member and Botetourt limestone Member, of the
Edinburgh Formation, Shenandoah County, Virginia, 39.0° N, 78.4° W Blackriveran 460.9 - 449.5 Ma) •
L. clavulus is present in the Middle Ordovician of Newfoundland, Canada (
Histiodella kristinae conodont zone,
Table Cove Formation; Table Point, "Middle Table Head" and Table Cove). •
L. mcgeheei is present in the Upper Ordovician of Oklahoma, United States (
Bromide Formation, Sandbian). •
L. retrolatus was collected from the Ordovician of Nevada (Eureka Quartzite, sandy limestone, 60–90 ft above base, Ranger Mountains, Nevada Test Site)) •
L. rostratus is known from the Upper Ordovician of Estonia (Narva open pit, and Lasnamägi, Kukruse Stage, Sandbian) and Latvia (Remte 3 borehole, and Adze 6 borehole, Kukruse Stage,
Sandbian). •
L. suriensis was excavated from the Middle Ordovician of Argentina (Portillo del Cajón, Cerro Morado; Cerro Suri; Puesto El Despacho; Las Pircas; all
La Rioja) •
L. volborthi occurs in the Lower Ordovician of the Russian Federation (Volkhovian level,
Syas River,
Putilovo and Babino quarries, St.Petersburg region). == Description ==