Fig. 4From: Palaeospondylus as a primitive hagfishAlcian blue-stained specimen of the adult hagfish Eptatretus burgeri in ventral view. brb, branchial bascket; lm, lingual muscle (‘cyclostome tongue’); lp, lingual plate; mo, mouth; perp, perpendicular muscle cartilage (cartilage at the origin of the lingual muscle). Scale bar, 1 cmBack to article page