Description of the first- and third-instar larvae of Hydrocanthus levigatus (Brullé, 1837) (Coleoptera: Noteridae)

Abstract

We describe the first and third larval instars of Hydrocanthus levigatus (Brullé, 1837), including morphometric and chaetotaxic analyses of the cephalic capsule, head appendages, legs, last abdominal segment, and urogomphus. Larvae of this species have many dark dorsal maculae on the body, similar to those of H. socius Sahlberg, 1844 and H. debilis Sharp, 1882. First instar larvae of H. levigatus can be separated from those of H. socius and H. debilis by the following combination of characters: large size and seta TI5 somewhat longer than tibial length on mesothoracic and metathoracic legs. Conversely, the third instar of H. levigatus differs from those of H. socius and H. debilis in the greater number of secondary setae on the legs.

Keywords:

• Adephaga
• burrowing water beetle
• morphometry
• chaetotaxy
• Argentina

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The work of J.I.U. was supported by a postgraduate scholarship from CONICET. M.C.M., J.I.U., and M.R.U. were supported by ANPCyT under Grant PICT–2017–1177 and by University of Buenos Aires under Grant UBACyT–20020190100240BA.