FIGURE 4 in A new bathyal ophiacanthid brittle star (Ophiuroidea: Ophiacanthidae) with Caribbean affinities from the Plio-Pleistocene of the Mediterranean

FIGURE 4. Lateral arm plates of various extant species of Ophiacanthidae (black-rimmed area) and Ophiotomidae, all shown with dorsal edges upwards, and with external view (left), internal view (middle) and the same internal view with the vertebral articular structures marked in red (right) for every species. Colours of background correspond to clade colours in Fig. 5. White background means the species are not included in the tree on Fig. 5. Scale bars equal 0.25 mm.