Isopoda, Valvifera, Arcturidae: A Idarcturus allelomorphus (after Menzies and Barnard 1959) B Idarcturus hedgpethi (after Menzies 1951b) C Neastacilla californica (after Menzies and Barnard 1959). Thermoarcturidae: D Califarcturus tannerensis (after Schultz 1966). Holognathidae: E Cleantioides occidentalis E1 dorsal view (after Brusca and Wallerstein 1979a) E2 lateral view of C. verecundus from Florida showing reduced size of pereopod 4 characteristic of Cleantioides (after Kensley and Clark 1998).