Fig. 6 in Direct development in African squeaker frogs (Anura: Arthroleptidae: Arthroleptis) reveals a mosaic of derived and plesiomorphic characters

Fig. 6 Different discrete developmental events subsumed within TS 4 in Arthroleptis. a Early TS 4 of A. wahlbergii, left: close-up of head region, right: lateral view with head facing left. b Mid-TS 4 of A. wahlbergii, left: close-up of head region; right: lateral view, arrow indicates somites. c Late TS 4 of A. xenodactyloides, left: close-up of head region, forelimb buds clearly defined, right: lateral view, arrow indicates somites. Scale bars = 1 mm