Taxonomy

Chelonethida (Pseudoscorpionida)

Taxonomy

IDENTIFYING THE ORDER PSEUDOSCORPIONIDA

Order: Pseudoscorpionida (Simple Classification)

Arachnida in which the prosoma is covered by an undivided carapace, bearing not more than two pairs of lateral eyes. The opisthosoma consists of twelve distinguishable somites the last reduced to a circumanal ring. The chelicerae are of two segments and are chelate; they bear on the distal segment a spinneret from which procedes silk secreted by prosomatic glads. The pedipalpi are very large, are of six segments and are chelate; venom glands within open near the tip of the metatarsus or tarsus or both. The legs are of seven segments the first two pairs distinguishable from the last two. There are terminal claws with an arolium between them. There is no pedicel and no telson. The manducatory apparatus is complex: the sternum is usually absent. Two pairs of spiracles are found on the third and fourth ophistosomatic somites.

Classification (Chamberlin, 1931)

Chamberlin made a clasiffication based on:
Two groups:
Heterosphyronida, and Homosphyronida.
Three sub-orders:
Heterosphyronida, Diplosphyronida, and Monosphyronida.
Six superfamilies:
Chthonioidea, Neobisioidea, Garypoidea, Feaelloidea, Cheiridioidea, and Cheliferoidea.

Eighteen families:
Dithidae, Chthoniidae, Syarinidae, Neobisiidae, Hyidae, Ideoroncidae, Menthidae, Olpiidae, Garypidae, Faellidae, Pseudogarypidae, Cheridiidae, Pseudocheridiidae, Sternophoridae, Myrmochernetidae, Chernetidae, Atemnidae, and Cheliferidae.

(THE TABLE IS LISTED BELOW)

GROUP

GROUP	HETEROSPHYRONIDA				HOMOSPHYRONIDA
SUB-ORDER	HETEROSPHYRONIDA	DIPLOSPHYRONIDA			MONOSPHYRONIDA
SUPER-FAMILY	CHTHONIOIDEA	NEOBISIOIDEA	GARYPOIDEA	FEAELLOIDEA	CHEIRIDIOIDEA	CHELIFEROIDEA
FAMILY	DITHIDAE	SYARINIDAE	MENTHIDAE	FEAELLIDAE	CHERIDIIDAE	MYRMOCHERNETIDAE
	CHTHONIIDAE	NEOBISIIDAE	OLPIIDAE	PSEUDOGARYPIDAE	PSEUDOCHEIRIDIIDAE	CHERNETIDAE
		HYIDAE	GARYPIDAE		STERNOPHORIDAE	ATEMNIDAE
		IDEORONCIDAE				CHELIFERIDAE