On the morphology and classification of larval water mites (Hydrachnidia, Acari) from springs in Luxembourg Author Martin, Peter text Zootaxa 2006 1138 1 44 journal article 10.5281/zenodo.172007 bd92c31d-534c-4bb2-a395-fb69e7ab01a9 1175­5326 172007 Hydryphantidae Piersig, 1896 Diagnosis: Dorsal plate (Dp) of unengorged larvae rather small, covering less than one third of the length of the idiosoma and bearing 2 or 4 pairs of propodosomal setae; lateral eyes on each side lying separately in the soft integument; humeral, hysterosomal and ventral setae often borne on platelets of different extent, the platelets sometimes being barely visible; coxal plates I to III rather small, separate and with 3 or 4 pairs of coxal setae; cheliceral bases separated from each other; palpal claw single or bifurcate; legs I to III six­segmented and each leg with three claws of which the lateral claws are extremely thin; distal segments of legs I to III very narrow distally. Remarks: Since the presence of the dorsal plate has obviously been overlooked in past descriptions of many hydryphantoid larvae (e.g. Lundblad 1927 ; Biesiadka & Cichocka 1984 ; Ullrich 1976 ; Martin 2000 ), it remains open whether the presence of a Dp is actually a family­specific character of the Hydryphantidae . Because of the few accurate descriptions of larvae within the family, at present, a diagnosis can be given neither for subfamilies nor for genera of the Hydryphantidae .