Agraulos is a genus of Solenopleuridae trilobites that lived during the Middle Cambrian in North America and Europe, particularly the Czech Republic. The genus was named by Hawle & Corda in 1847.

Etymology

Agraulos is derived from the Greek Ἄγραυλος, "country woman", wife of Kekrops.

Type species

Type species (designated by Miller 1889). Arion ceticephalus Barrande, 1846 from the Cambrian Eccaparadoxides pusillus Zone in the Skryje Member of the Buchava Formation, within the Skryje–Tyrovice Basin, Bohemia.

Diagnosis

Agraulinae with cephala generally domed; glabella isosceles-trapezoidal, i.e. with truncate front and base angles of the forward-converging lateral margins/flanks more than 15°; occipital ring mesially swollen backwards, with or without a medial node or spine; preglabellar field relatively long (sag.); posterolateral projection of fixigena narrow (tr.); librigenal spines short to long, with some deflected outwards. Thorax of up to 16 segments with first anterior axial rings marked by terrace lines immediately succeeded in some species by rings bearing incipient median nodes or incipient/prominent spines; thoracic segments finely punctate or granulate. Pygidium, small and transverse (Fletcher, 2017, pp, 9,10).

Distribution

Remarks

Arionellus quadrangularis Whitfield (1884), originally collected from the mid-Cambrian Braintree Formation at Old Hayward Quarry, Quincy, Massachusetts, US, had previously been assigned to Agraulos by Walcott and others. McMenamin (2002), however, erected Skehanos to accommodate the species as Skehanos quadrangularis. Scandinavian species attributed by Westergård (1953) to Agraulos [i.e. A. difformis, A. aculeatus, A. acuminatus (all Angelin, 1851), and A. anceps] were transferred by Ahlberg & Bergström (1978) to Proampyx although several Lower Cambrian forms they also assigned to Proampyx would later be allocated to various other genera.