Fig. 2 in The extent of the pterosaur flight membrane

Fig. 2. Various configurations of the pterosaur main wing. A. The traditional "bat−like" interpretation adopted by Sömmerring 1812 (1) and Marsh 1888 (2). B. The "bird−like" model where the membrane was free of the legs and attached to the body after Peters 2001(3), Padian and Rayner 1993 (4, 5), or tail Bennett 1987(6). C. The "Pterodactylus model" where the membrane, based on specimen NHMW 1975/1756, attached around the knee (7). D. A more recent "bat−like" wing model (8, 9) where the membrane attaches to the ankle (Unwin and Bakhurina 1994; Frey and Martill 1998; Frey and Tischlinger 2000; Tischlinger and Frey 2002; Frey et al. 2003).