subchelate

3D) subchelate. Syncoxa elongate, with concave outer margin and 1 outer subdistal seta.

Gnathopod 1 subchelate to parachelate; coxa small; merus and carpus not rotated; carpus short; propodus large, palm straight to convex; dactylus slightly curved, not hidden by setae.

Geralinura carbonaria (Arachnida; Uropygi) from Mazon Creek, Illinois, USA, and the origin of subchelate pedipalps in whip scorpions.

Traits examined were (1) head length, which is correlated with total length and mass (Edwards and Cowell, 1992); (2) the sum of first and second antennal segments, which increases with instar (Geisler, 1944; Cooper, 1965); (3) length of tergite spines (mucronations) on the posterior margin of abdominal segments 1 and 2; (4) width of posterior gnathopods in males [these are subchelate thoracic appendages that are strongly sexually dimorphic and influence male mating success (Wellborn, 1993)]; (5) number of eggs in the marsupium, an index of fecundity; (6) egg size, and (7) size at maturity, which was estimated as the size of the smallest gravid female in the population sample.

2D) large, subchelate, 3-segmented, comprising long protopod (corpus) and subchela consisting of free endopodal segment (shaft) and claw.

The specimen is immediately identifiable as a species of Naushonia by the elongate, subchelate, and somewhat oversized chelipeds (approximately equal in length to the carapace in this species and in most others; Fig.