Horse shoe Crab at Chandipur beach.
Brown, hard chitin carapace, joined in the middle. Telson. Mating on beaches in Delaware Bay.
single horseshoe crab, several Chelonibia barnacles
several horseshoe crabs bunker into the soft sand during low tide, the barnacle Chelonibia can be seen on closest.
I went back to the same spot on May 28 and there were several dozen pairs or sometimes 2 males on 1 female along the same stretch of beach.
100s of adults mating and egg-laying at waters at high tide
Merostomata is the name given to a grouping of the extinct Eurypterida (sea scorpions) and the Xiphosura (horseshoe crabs). The term was originally used by James Dwight Dana to refer to Xiphosura only, but was emended by Henry Woodward to cover both groups.