Morphology of a limulus (horseshoe
crab): marine arthopod which lives near the shore.
Frontal organ: organ of the horseshoe crab situated at face-level.
Chelicera: a pair of venomous hooks situated on the head of a
Walking leg: floating appendage.
Genital operculum: structure covering the opening to the genital
Transverse auricular groove: shallow impression related to the
Appendages modified to serve as gills: leaf-shaped leg.
Auricular cavity of the tail spine: cavity related to the flexibility
and movement of the telson.
Telson (tail spine): barb at the end of the horseshoe crabs tail.
Abdomen: posterior part of the body of a horseshoe crab.
Mobile spine: movable tail of the horseshoe crab.
Cephalothorax: head and thorax of the horseshoe crab, which together
form one section of the body.
Eye: sight organ of a horseshoe crab.
Ocelli: rudimentary eye.