Comments of Limulus
Distribution:-
limulus polyphemus, the American horse-shoe crab, is restricted to North-western Atlantic coast,Gulf of Mexico and West Indies. All the other membranes are found along the south east Asian pacific coasts,from Japan and Korea through the East Indies and philippines.
Habit and Habitat:-
limulus is a marine Form, found by rrowing in the sand. They live comparatively in shallow water along sandy and muddy shores of sheltered bays and estuaries.
General character:-
1) Limulus is commonly known as king-crab.
2) Prosoma is covered by an unsegmented, semicircular, or horse-shoe-shaped carapace.
3) Prosoma in conves above with sloping sides and bears three longitudinal ridges one median and two lateral.
4) The metasoma is much reduced.
5) Respiration by book-gills.
6) Larva trilobite.
7) Excretion by coxal or brick red glands.
Diagram of Limulus
