The Subboreal marly facies of the Lower Jurassic (Upper Pliensbachian) Amaltheenton Formation in southern Germany contains a reduced association of belemnite species. Based on their rostra, we here describe three new taxa, Enigmabelus doppelsteini n.g. n. sp., E. micros n. sp., and E. leptos n. sp. included in a new family Enigmabelitidae, which is assigned to the suborder Belemnitina. All specimens come from the few centimetres thick echinid-pectinid horizon, uppermost Pliensbachian, of the clay pit south of Buttenheim (Germany, northern Bavaria). The moderately slender to slender and small rostra (between 8 and about 25 mm) exhibit uncommon and unique features, for instance the reduction of the ventral part of the rostrum resulting in an open alveolus. Most unusual is the apical line of the Enigmabelitidae n.f., which runs along the ventral surface of the rostrum solidum causing a fan-like arrangement of calcite crystals (instead of a concentric arrangement). We therefore introduce the perilineate apical line.
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