Table 2. Selected ratios of third instars of Hydrotarsus Falkenström (HDT), Hydroporus Clairville (HDR) and Sanfilippodytes Franciscolo (SAN); n = number of species studied. Features1GeneraHDT (n = 1)HDR (n = 15)SAN (n = 1)HL/HW1.11–1.131.06–1.271.27Ant L/HW0.56–0.610.61–0.740.64Ant L/Mx plp L1.17–1.261.15–1.491.13Mx plp L/Lb plp L1.14–1.241.00–1.291.20A2 L/A3 L0.98–1.040.84–1.180.91A3′ L/A4 L0.56–0.630.59–0.850.89MX2 L/MX1 L0.81–0.850.74–1.010.95LB2 L/LB1 L0.96–0.970.96–1.251.15FC L/HL0.76–0.770.75–0.800.75Metaleg L/HW2.172.37–2.642.51Siphon L/LASL0.170.25–0.410.37Uro1 L/LASL1.42–1.490.75–1.861.18Uro (1 + 2) L/LASL3.10–3.311.49–3.732.62Uro1 L/HW0.710.62–1.090.81Uro (1 + 2) L/HW1.55–1.571.18–2.191.79Uro1 L/Uro2 L0.82–0.840.88–1.290.81Uro1 L/Uro2′ L0.86–0.880.91–1.370.90LASL/HW0.47–0.500.54–0.830.68 1 Ant, antenna; FC, frontoclypeus; Lb plp, labial palpus; Mx plp, maxillary palpus; otherwise as defined in Alarie (1997) and Alarie et al. (1997).

Published as part of Alarie, Yves & Bilton, David T., 2001, Larval Morhology Of Hydrotarsus Falkenström: Generic Characteristics, Description Of H. Compunctus (Wollaston), And Analysis Of Relationships With Other Members Of The Tribe Hydroporini (Coleoptera: Dytiscidae, Hydroporinae), pp. 347 in The Coleopterists Bulletin 55 (3) on page 347, DOI: 10.1649/0010-065X(2001)055[0341:LMOHFM]2.0.CO;2, http://zenodo.org/record/10102577