Agraulos

Agraulos Hawle & Corda 1847, is a genus of trilobites that lived during the Middle Cambrian in North America and Europe, particularly the Czech Republic.
Etymology.
"Agraulos" is derived from the Greek , "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.
Familial status.
Family SOLENOPLEURIDAE (Angelin, 1854).
Subfamily AGRAULINAE Fletcher, 2017 emend. "nom. transl. ex" AGRAULIDAE Raymond. 1913.
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).
Remarks.
"Arionellus quadrangularis" Whitfield (1884, p. 147, pl. 14, ﬁg. 8), collected originally from the mid-Cambrian Braintree Formation at Old Hayward Quarry, Quincy, Massachusetts, USA, has previously been assigned to "Agraulos" by several authors, commencing with Walcott in 1884. MacMenamin (2002), however, erected "Skehanos" gen. nov. to accommodate the species "quadrangularis".
Scandinavian species attributed by Westergård (1953) to "Agraulos" [i.e. "difformis", "aculeatus", "acuminatus" (all Angelin, 1851), and "anceps" sp. nov.] were transferred by Ahlberg & Bergström (1978) to "Proampyx" Frech 1897, although several Lower Cambrian forms they also assigned to "Proampyx" would later be allocated to various other genera. 