Thelyphonus

“Thelyphonus, one of the Pedipalpi. A, Ventral view. I, Chelicera (detached). II, Chelae. III, Palpiform limb. IV to VI, The walking legs. stc, Sterno-coxal process (gnathobase) of the chelae. st1, Anterior sternal plate of the prosoma. st2, Posterior sternal plate of the prosoma. pregen, Position of the pracgenital somite (not seen). l, l, Position of the two pulmonary sacs of the right side. 1 to 11, Somites of the opisthosoma (mesosoma plus metasoma). msg, Stigmata of the tergosternal muscles. an, Anus. B, Dorsal view of the opisthosoma of the same. pregen, The prae-genital somite. p, The tergal stigmata of the tergo-sternal muscles. paf, Post-anal segmented filament corresponding to the post-anal spine of Limulus.” — The Encyclopedia Britannica, 1910

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