Lebertia holsatica K. Viets, 1920

Martin, Peter, 2006, On the morphology and classification of larval water mites (Hydrachnidia, Acari) from springs in Luxembourg, Zootaxa 1138, pp. 1-44 : 23-24

Lebertia holsatica K. Viets, 1920

Records ( Table 2): Benthos samples at six spring sites in Gutland and in Ösling, 17 individuals ( Gerecke et al. 2005). E 1 2 larvae, parasitic on chironomids. Attribution by rearing from a female collected at site Lux Qu 19 (E 1).

Description (qu 19, n = 5): Idiosoma ovate. Length/width 270–276 (273)/ 192–207 (198).

Dorsal idiosoma ( Fig. 35): Dorsal plate with distinct alveolar pattern, Dp reverse menhir­shaped, slightly tapering posteriorly. Length/width Dp 246–249 (247)/ 126–141 (134), Mp 2 ­Amdp 62–71 (66), Mp 1 ­Mp 1 32–36 (34), Mp 2 ­Mp 2 35–40 (38), Lp 1 ­Lp 1 14–18 (17), Lp 2 ­Lp 2 58–67 (61), Mp 1 ­Lp 1 8–12 (10), Mp 2 ­Lp 2 46–53 (48), Mp 1 ­Mp 2 50–58 (54), Lp 1 ­Lp 2 24–26 (25), Mp 1 17–18 (17), Mp 2 18–20 (19), Lp 1 70–76 (72), Lp 2 118–132 (126), Hu 106–114 (110), Mh 1 124–134 (129), Mh 2 110–126 (116), Mh 3 94–103 (98), Mh 4 73–79 (75), Lh 1 74–115 (103), Lh 2 103–106 (105), Lh 3 85–88 (87).

Ventral idiosoma ( Fig. 36): All ventral setae smooth, except for the pinnate setae V 1 and V 2; structure of the coxal plates alveolar. Median length (excluding the gnathosomal bay) CX­I 90–103 (98), maximal length/width CX­I 126–148 (141)/ 52–54 (53), length CX­II+III (up to the Expp) 82–94 (86), width 95–103 (99), C 1 ­C 2 71–82 (74), C 1 ­Mmcp 20–24 (22), C 4 ­Pmcp 100–106 (102), C 1 ­C 4 52–64 (57), C 1 70–74 (72), C 2 94–95 (94), C 3 106–115 (110), C 4 102–108 (105), Exp equally trapezoid, anterior edges rounded, posteriorly slightly tapering; Expp slightly elongated and located centrally in the Exp, between setae E 2. Length/width Expp 29–36 (34)/ 36–37 (37), E 1 ­ E 1 14 –19 (16), E 2 ­ E 2 22 –28 (25), E 1 ­ E 2 11 –14 (12), E 1 25 –29 (28), E 2 25 –30 (28), V 1 42 –47 (44), V 2 49 –55 (52), V 3 74 –79 (77), V 4 134–150 (144).

Gnathosoma: base (measured from ventral) (n= 4) 77–84 (80), chelicera 67–72 (70), chela 13–14 (14), length/width P 2 (n= 2) 29–30 (29)/ 23–24 (23), P 3 25–28 (26)/ 20–24 (22), length claw 8–10 (9).

Legs (n= 5): Empodial claw short, stout, simple and falciform; lateral claws less heavy and elongated.

Leg I: Total length 224–241 (232), length/height I­L 1 (1 se) 31–36 (34)/ 23–24 (24), I­ L 2 (7 se) 37–41 (39)/ 20–23 (22), I­L 3 (4 se, 1 so) 46–48 (46)/ 22–23 (22), I­L 4 (9 se, 2 so, 1 eu) 54–56 (55)/ 19–20 (20), I­L 5 (13 se, 1 so, 2 eu) 56–60 (58)/ 17–18 (18).

Leg II: Total length 247–259 (252), length/height II­L 1 (1 se) 36–38 (37)/ 24–25 (24), II­L 2 (7 se) 37–40 (38)/ 22–24 (23), II­L 3 (4 se, 1 so) 44–47 (46)/ 20–23 (22), II­L 4 (9 se, 2 so, 1 eu) 60–62 (61)/ 18–20 (19), II­L 5 (13 se, 1 so, 2 eu) 70–72 (71)/ 18–19 (18).

Leg III: Total length 284–299 (291), length/height III­L 1 (1 se) 42–44 (43)/ 20–22 (21), III­L 2 (6 se) 40–43 (42)/ 18–19 (19), III­L 3 (4 se, 1 so) 52–53 (52)/ 17–18 (17), III­L 4 (9 se, 1 so) 71–74 (72)/ 17–18 (17), III­L 5 (11 se, 1 eu) 80–84 (82)/ 16–17 (16).

Diagnostic characters of larvae: E.g., short legs, small Dp.

Remarks: The larva of Lebertia holsatica was previously unknown. An accurate documentation by means of the drawing of legs and gnathosomal characters was not possible with the few specimens available.