Arca inermis G. Sandberger & F. Sandberger, 1854 [invalid]
Original source
Sandberger & Sandberger (1850–1856): pl. 28 fig. 11 [description on p. 274 appeared in 1856].
Type stratum and age
“Stringocephalenkalk”; upper Givetian, Middle Devonian.
Type locality
“ Villmar ”; Villmar near Limburg on the Lahn, Hesse, Germany.
Type material
Nine syntypes (MWNH-DEVO-000232) are stored at the Museum Wiesbaden, Hessisches Landesmuseum für Kunst und Natur. One of the shells is the type material of Macrodus villmarensis Beushausen, 1895.
Remarks
Sandberger & Sandberger (1856: 274) listed Arca michelini d’Archiac & Verneuil, 1842 in synonymy, but without explanation. We are not aware of any homonymy issue; therefore, their name is a junior objective synonym of A. michelini (today in Parallelodon). Sandberger & Sandberger distinguished a longer (fig. 11) and a shorter (fig. 11a) variety; Beushausen (1895) separated the latter as a new species, Macrodus villmarensis, and treated the elongated variety as M. michelini d’Archiac & de Verneuil, 1842.
Publication Date: 2026-06-04