Chelicerae: The first pair of appendages. These are usually claw-like in structure but may be reduced to small knobs or absent altogether in some species.
Chelophores or Chelifores: Older names for chelicerae. These names were used instead of chelicera by earlier pycnogonid workers so as to avoid implying a homology (with arachnids) where one may or may not exist. A recent paper (Bain, in press) has established that pycnogonids are an order of arachnids and so the term chelicera should be used instead of chelophore or chelifore.
Crurigers: An older name for lateral processes.
Decapodous condition: with five pairs of walking legs.
Dodecapodous condition: with six pairs of walking legs.
Lateral Process: The walking legs articulate with the body at the lateral processes.
These are short extensions of the body proper which superficially resemble the first
coxal segment in many cases. The lateral process may be smooth or may be covered
with tubercles or spines of various sorts.
Octopodous condition: with four pairs of walking legs.
Ovigers or Ovigerous legs: The third pair of appendages. Used by both sexes for
grooming and by the males for both courtship and mating and for carrying the eggs
and (sometimes) the larvae.
Ovigerous Leg Spines or Compound Spines: These are the spines present in single or
multiple rows on segments 7-10 of the ovigerous leg.
Palps: Older term for second pair of appendages; replaced by pedipalp