Table 2. Selected ratios of third instars of Hydrotarsus Falkenström (HDT), Hydroporus Clairville (HDR) and Sanfilippodytes Franciscolo (SAN); n = number of species studied.
Features1 Genera
HDT (n = 1) HDR (n = 15) SAN (n = 1)
1 Ant, antenna; FC, frontoclypeus; Lb plp, labial palpus; Mx plp, maxillary palpus; otherwise as defined in Alarie (1997) and Alarie et al. (1997).
HL/HW 1.11–1.13 1.06–1.27 1.27
Ant L/HW 0.56–0.61 0.61–0.74 0.64
Ant L/Mx plp L 1.17–1.26 1.15–1.49 1.13
Mx plp L/Lb plp L 1.14–1.24 1.00–1.29 1.20
A2 L/A3 L 0.98–1.04 0.84–1.18 0.91
A3′ L/A4 L 0.56–0.63 0.59–0.85 0.89
MX2 L/MX1 L 0.81–0.85 0.74–1.01 0.95
LB2 L/LB1 L 0.96–0.97 0.96–1.25 1.15
FC L/HL 0.76–0.77 0.75–0.80 0.75
Metaleg L/HW 2.17 2.37–2.64 2.51
Siphon L/LASL 0.17 0.25–0.41 0.37
Uro1 L/LASL 1.42–1.49 0.75–1.86 1.18
Uro (1 + 2) L/LASL 3.10–3.31 1.49–3.73 2.62
Uro1 L/HW 0.71 0.62–1.09 0.81
Uro (1 + 2) L/HW 1.55–1.57 1.18–2.19 1.79
Uro1 L/Uro2 L 0.82–0.84 0.88–1.29 0.81
Uro1 L/Uro2′ L 0.86–0.88 0.91–1.37 0.90
LASL/HW 0.47–0.50 0.54–0.83 0.68