E-Fauna BC: Electronic Atlas of the Wildlife of British Columbia

Pentamera pseudocalcigera is V-shaped, and can grow up to 10 cm long. Its anterior end is bluntly pointed; the posterior end is longer and more tapered. This species is usually white or beige. In preserved specimens the tube feet are yellowish white, and on a slightly raised ridge above the smooth, pale purple skin. The bands of tube feet are made up of two to four rows each. Each tube foot has a broad base that tapers quickly to the tip. The introvert and 10 tentacles usually have peppery brown spots. The two ventral tentacles are about halfthe size of the others.

Skin ossicles: large triangular to star-shaped perforated plates; a few may have a minute spire in the centre; curved supporting rods in the tube feet with a large complex spire.

Compared to other Pentamera species, P. pseudocalcigera is larger. It has a long tapering tail rather than a nipple like tail; and it has conical, rather than thin, cylindrical tube feet.