No picture of the mandibular palps. THey are short appendages, usually three segments that extend out from the manible. You can rarely see them except in preserved specimens in which you can spread the mouth parts.
Haptosquilla fall into two major groups, those similar th H. glyptocercus and those similar to H. trispinosa. The latter all have polarized blue plates on the first maxillipeds. The former do not.
Roy