Table 2.

Morphological comparison of I. vespertilionis, I. ariadnae sp. nov. and I. simplex female

Trait	I. vespertilionis*	I. ariadnae sp. nov.	I. simplex*
Max. engorged size	10	7	4.5
Length of legs	long (tarsus I: 1.6)	long (tarsus I: 1.5)	moderately long (tarsus I: 0.73)
Basis capituli	- dorsally posterolaterally flange	- dorsally posterolaterally flange	- dorsally no flange (ventrolaterally triangular ridge)
			- posteriorly sinuous
	- posteriorly straight
		- posteriorly slightly curved with dorsal ridge
Palps (II+III segments)	long, narrow (0.39 + 0.22)	short, broad (0.28 + 0.16)	short (0.16 + 0.14)
Joining of II-III segments	distinct	distinct	indistinct
Hypostome	long, 15 rows of slender teeth, ventrally in 6-8 lines	medium, 10 rows of broad teeth, ventrally in 4 lines	short, 8 rows of broad teeth, ventrally in 4-6 lines
Areae porosae	large, oval, interval broad	large, oval, interval slightly broad	large, oval, interval narrow
Scutal setae	anterolaterally prominent	anterolaterally very few	anterolaterally prominent
Scutal length per width	1.76/1.08 (approx. 1.6)	1.15/0.95 (approx. 1.2)	1.13/0.8 (approx. 1.4)
Idiosoma hair covering	dense	sparse	dense
Coxae	posteroexternally concave, surface flat	posteroexternally convex, surface rounded	posteroexternally concave
Anal groove	parallel	posteriorly slightly divergent	posteriorly markedly divergent
Spiracle opening	oval, regular outline	oval, irregular outline	(sub)circular, broad

*Descriptions according to Arthur (1956), Babos and Janisch (1958), Nosek and Sixl (1972).

Sizes are given in mm.