(Clark, 1914)
P. axiologus is a sea cucumber with bright red ambulacra and yellow to blue inter-ambulacra. It is a medium to large-sized species (length along the mid-ventral ambulacrum 2.5-3 x the length of the mid-dorsal interambulacrum, e.g. largest specimen of Clark (1946) was 125 mm dorsally, but 325 mm ventrally). The body is stout and cylindrical, with its oral end turned up and tapering, a pliable body, and a smooth and slippery tegument. Spicules are small perforated plates (P. axiologus spicules[/l], [l]p_axiologus_spicules_2.jpgP. axiologus spicules 2[/l]), sometimes absent in larger specimens. P. axiologus has been recorded from [l][m]Glossary[/m][r]Reef[/r]reefs and coastal areas, where it is found exposed on hard substrates below 1Om.
Remarks: Another species P. violaceus known from S.E. Asia has been reported - from collections in the British Museum - from northern Australia (Clark and Rowe, 1971).