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). E1 2 larvae, parasitic on chironomids. Attribution by rearing from a female collected at site Lux Qu19 (E1).

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), Mp2­Amdp 62–71 (66), Mp1­Mp1 32–36 (34), Mp2­Mp2 35–40 (38), Lp1­Lp 1 14–18 (17), Lp2­Lp2 58–67 (61), Mp1­Lp 1 8–12 (10), Mp2­Lp2 46–53 (48), Mp1­Mp2 50–58 (54), Lp1­Lp 2 24–26 (25), Mp 1 17–18 (17), Mp 2 18–20 (19), Lp1 70–76 (72), Lp2 118–132 (126), Hu 106–114 (110), Mh1 124–134 (129), Mh2 110–126 (116), Mh3 94–103 (98), Mh4 73–79 (75), Lh1 74–115 (103), Lh2 103–106 (105), Lh3 85–88 (87).

Ventral idiosoma ( Fig. 36 ): All ventral setae smooth, except for the pinnate setae V1 and V2; 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), C1­C2 71–82 (74), C1­Mmcp 20–24 (22), C4­Pmcp 100–106 (102), C1­C4 52–64 (57), C1 70–74 (72), C2 94–95 (94), C3 106–115 (110), C4 102–108 (105), Exp equally trapezoid, anterior edges rounded, posteriorly slightly tapering; Expp slightly elongated and located centrally in the Exp, between setae E2. Length/width Expp 29–36 (34)/36–37 (37), E1­ E 1 14 –19 (16), E2­ E 2 22 –28 (25), E1­ E 2 11 –14 (12), E 1 25 –29 (28), E 2 25 –30 (28), V1 42 –47 (44), V2 49 –55 (52), V3 74 –79 (77), V4 134–150 (144).

Gnathosoma: base (measured from ventral) (n=4) 77–84 (80), chelicera 67–72 (70), chela 13–14 (14), length/width P2 (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 I­L1 (1se) 31–36 (34)/23–24 (24), I­ L2 (7se) 37–41 (39)/20–23 (22), I­L3 (4se, 1so) 46–48 (46)/22–23 (22), I­L4 (9se, 2so, 1eu) 54–56 (55)/19–20 (20), I­L5 (13se, 1so, 2eu) 56–60 (58)/17–18 (18).

Leg II: Total length 247–259 (252), length/height II­L1 (1se) 36–38 (37)/24–25 (24), II­L2 (7se) 37–40 (38)/22–24 (23), II­L3 (4se, 1so) 44–47 (46)/20–23 (22), II­L4 (9se, 2so, 1eu) 60–62 (61)/18–20 (19), II­L5 (13se, 1so, 2eu) 70–72 (71)/18–19 (18).

Leg III: Total length 284–299 (291), length/height III­L1 (1se) 42–44 (43)/20–22 (21), III­L2 (6se) 40–43 (42)/18–19 (19), III­L3 (4se, 1so) 52–53 (52)/17–18 (17), III­L4 (9se, 1so) 71–74 (72)/17–18 (17), III­L5 (11se, 1eu) 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.

Figures

FIGURES 34 – 37. Fig. 34: Bandakia concreta (from Martin 2003), Fig. 35: Lebertia holsatica, dorsal idiosoma, Fig. 36: L. holsatica, ventral idiosoma (Figs. 35 – 36 original), Fig. 37: L. glabra, ventral idiosoma (modified from Martin 2000). Scale bar: 100 µm.