Fig. 4 in Oldest mickwitziid brachiopod from the Terreneuvian of southern France

Fig. 4. Ventral valve of mickwitziid Kerberellus marcouensis Devaere, Holmer, and Clausen gen. et sp. nov. from the Terreneuvian Heraultia Member, Montagne Noire (southern France). A. USTL2859-6; A1, external view; A2, detail of A1, apical area, upper arrow pointing median furrow crossing internal mould of apex, lower arrow pointing new row of pores inserted between existing rows; A3, posterior view; A4, detail of A3, interarea with triangular sinus of the subapical margin; A5, anterior view. A6. Lateral view of highly conical ventral valve. B. USTL1234-5 (holotype); B1, external view; B2, lateral view of highly conical ventral valve; B4, detail of B2, partially preserved external coating with variable of tubes distal end and long, radial, straight and thin phosphatic sheets running from the apex to the anterior margin between rows of radial tubes; B3, posterior view, interarea with triangular sinus of the subapical margin. C. USTL2860-6; C1, external view; C2, detail of C1, apical area, upper arrow pointing median furrow crossing internal mould of apex, lower arrow pointing new row of pores inserted between existing rows; C3, postero-lateral view, interarea with triangular depression.