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 Major Groups | Insecta (insects) | Coleoptera (beetles) | Noteridae


Major Group: Insecta
Order: Coleoptera
Family: Noteridae

Descriptive Features:

  • head not exserted
  • eyes usually in contact with anterior edge of pronotum, not completely divided
  • antennae entirely or almost entirely glabrous, 11-segmented
  • prothorax with pair of notopleural sutures separating notum from externally visible pleuron on each side
  • elytra concealing abdominal tergites
  • dorsal surface strongly convex
  • scutellum not visible
  • ventral surface flattened
  • abdomen with ventrite 1 divided into 2 or 3 parts by hind coxae
  • mesocoxal cavities open laterally
  • metasternum without transverse suture, if metasternal suture present, then elytra without regular puncture rows
  • metacoxal lateral portions longer than metasternum, metacoxal plates absent
  • metacoxae extending laterally to meet elytra, so that junction of metepimera and first ventrite is not visible, metacoxae with longitudinal plates covering bases of trochanters
  • junction between metasternum and metacoxae angulate in middle
  • forelegs not long and raptorial, middle and hind legs longer and narrower
  • fore tibia without antenna cleaner
  • tarsi always 5-segmented
  • size: 1.5 - 7mm
  • head transverse and partly retracted into prothorax
  • antennae less than half as long as head width
  • mandible without mesal groove or internal perforation
  • labrum separated from head capsule by complete suture
  • body compact and fusiform
  • abdominal tergum 8 terminal, forming tapered process (siphon) bearing spiracles at apex, without ventral gills
  • urogomphi highly reduced and usually not visible
  • legs present
  • legs short and often concealed from above
  • size: 1.5mm

    Canthydrus bovillae larva


    Neohydrocoptus subfasciatus

    Taxonomic Checklist: Genera
    2 species
    Hydrocanthus 3 species
    Neohydrocoptus subfasciatus Sharp
    Notomicrus tenellus Clark (larva unknown)

    Distribution: NE Qld, NT, N WA, S NSW, N NSW, Vic, SA 

    Sensitivity Rating: SIGNAL grade 4

    Functional Feeding Group: predators (adults); larvae of Canthydrus and Hydrocanthus are predators, larvae of Neohydrocoptus and Notomicrus may be gathering collectors


    Billabong Creek on Old Coree nr Jerilderie, NSW

    Ecology: Instream habitat: Noterid beetles are found in the margins of shallow ponds, swamps and temporary puddles in woodlands. Adults and larvae usually live among the roots of floating or emergent aquatic plants.
    Feeding ecology: Previously both adults and larvae of all Noteridae species were thought to be detritus feeders (Lawrence & Britton 1991), with the larvae usually feeding on the bottom. However, it is now known that the adults are carnivores, as are the larvae of Canthydrus and Hydrocanthus species (Watts 2002) but little is known about the larvae of other genera
    Habit: Adults of most Noteridae species are capable of flight and are readily attracted to light. Some larvae obtain air using a spiracle-bearing siphon at the end of their abdomen to tap into hollow plants stems.
    Life history: There is no information on Australian species. In Singapore, noterid pupae are found in air-filled cocoons attached to the roots of aquatic plants.


    Information Sources: Lawrence & Britton 1991, Lawrence et al. 2002, Watts 2001, 2002, Toledo & Hendrich 2006, Hendrich et al. 2004
    Key to Genera: Watts 2002 (adults and larvae)
    Key to Species: Watts 2001 (adults partial)
    Toledo & Hendrich 2006 (Hydrocanthus adults, inc. Asian species)