Skip to main content
Fig. 30 | Frontiers in Zoology

Fig. 30

From: New insights into the evolution of portunoid swimming crabs (Portunoidea, Heterotremata, Brachyura) and the brachyuran axial skeleton

Fig. 30

Examples showing character states concerned with the exterior of the 5th pereiopod. A, B Comparison between walking leg-shaped 5th pereiopod (A) and swimming leg-shaped 5th pereiopod (B). Note that character state 43(1) shown here which is concerned with the arrangement of long setae is not necessarily typical of a walking leg, and those concerning merus length (44(1)) and shape of the dactylus tip (49(1)) are not necessarily typical of a swimming leg (see also Figs. 34, 35, and “Characterising the P5-swimming crab morphotype” section). CF Examples showing character states concerned with the shape of the margin of the proximo-ventral dactylus of the 5th pereiopod (character 48). Note that when the dactylus is adducted (D, E) and the proximo-ventral dactylus margin is convex (or straight) (C), the dactylus is partly immersed in the arthrodial cavity of the propodus (D), while it is not immersed (E) when the proximo-ventral dactylus margin is concave (F). DactMarg proximo-ventral dactylus margin, ImmDact area of the dactylus that is immersed in the arthrodial cavity of the propodus when the dactylus is adducted

Back to article page