The nautiloids from the Early Carboniferous Dalle à Merocanites of Timimoun, western Algeria

Early Carboniferous coiled nautiloids from North Africa are virtually unknown. An assemblage of nine species, all the family Trigonoceratidae, Dalle à Merocanites (Tournaisian-Viséan boundary interval) Timimoun in western Algeria is described, being most diverse nautiloid known but much less than time-equivalent assemblages Belgium and Ireland. The consists species Maccoyoceras pentagonum sp. nov., Lispoceras orbis Thrincoceras devolvere Rineceras multituberculatum rectangulatum Vestinautilus padus concinnus Planetoceras destrictum nov. transforme A morphometric analysis shows that intraspecific variation these within rather narrow limits.