The peristomial plates of ophiuroids (Echinodermata: Ophiuroidea) highlight an incongruence between morphology and proposed phylogenies
Fig 4
Character states of peristomial plates (PEPs): Summary of results.
The cladogram is derived from O’Hara et al. [9] (slightly modified). Regarding fragmentation state, a = single, b = two parts, c = three parts, d = other; the values are the numbers of species showing each state; where a species shows two states, each state is assigned a value of 0.5. The numerals in parentheses refer to the following comments: (1) One species has small PEPs and one has large PEPs. (2) One species has small PEPs. (3) One species (Ophioplocus januarii) has inclined PEPs and two species (O. januarii and Sigsbeia murrhina) have small PEPs. (4) One species has small PEPs and one has large PEPs. (5) One species (Ophiocomella ophiactoides) has large horizontal PEPs. (6) One species (Ophiocten sericeum) has small PEPs. (7) One species (Ophiolipus agassizii) has small PEPs.