Description of larvae of Herophydrus musicus (Klug) and analysis of relationships with members of the genus Hygrotus Stephens (Coleoptera : Dytiscidae, Hydroporinae)

Description of the larvae of Herophydrus musicus (Klug, 1833) is presented including a detailed chaetotaxic and porotaxic analysis of the cephalic cap sule, head appendages, legs, last abdominal segment and urogomphi. Compared to other genera of the tribe Hydroporini, it is postulated that Herophydru s Sharp is more closely related to members of the genus Hygrotus s. lat. St ephens based on the following synapomorphies: (i) absence of the primary po re ANf; (ii) absence of the primary seta TR2; (iii) absence of a ventroapic al spinule on antennomere 3; and (iv) more proximal position of the primary seta UR8 on urogomphomere i. Larvae of Herophydrus musicus are very simila r morphologically to members of Hygrotus s. let. lacking natatory setae on legs.