Fig. 4 in Understanding the color variability and resolving taxonomic confusion in the sea cucumber Isostichopus badionotus (Echinodermata, Holothuroidea): a revision of the genus Isostichopus

Fig. 4. Comparison of the calcareous rings of species and subspecies of Isostichopus Deichmann, 1958. A. I. badionotus (Selenka, 1867). B. I. maculatus phoenius (Clark, 1922) (A–B showing calcareous rings from specimens of different sizes). C. I. maculatus maculatus (Greeff, 1882). D. I. fuscus (Ludwig, 1875). E. I. macroparentheses (Clark, 1922). Dimensions of the individuals from which each ring was obtained are shown next to their museum catalog number. Abbreviations: ip = interradial plate; rp = radial plate. Scale bar = 4 mm.