Pentamera lissoplaca is a small, white species up to 3.5 cm long. Its body may be straight or curved, and tapers to the posterior end, at least in relaxed animals. The long, non-retractile tube feet are in five distinct, crowded double rows and are slightly straw-coloured. The skin between the rows is smooth or wrinkled. It has ten smallish tentacles, including two much smaller ventral ones, that are usually brown or darker than the body.
Skin ossicles: mostly larger, elongate diamond-shaped plates, and a less-common delicate table with a small spire; also curved supporting rods in tube feet.
Similar SpeciesAll the Pentamera are similar, and difficult to tell apart. To be sure, you will have to check the ossicles and compare them with other species in this book. As with other Pentamera species, Pentamera lissoplaca can also be confused with Eupentacta quinquesemita and Eupentacta pseudoquinquesemita. The skin ossicles of these latter two are distinct.