Hygrobia is a genus of aquatic beetles native to Europe, North Africa, China and Australia. It is the only genus in the family Hygrobiidae, also known as the Paelobiidae.[1] These are known commonly as squeak beetles[2] or screech-beetles.[3]

There are six known living species, with a highly disjunct distribution, and one extinct species, Hygrobia cretzschmari.

Hygrobia hermanni HabitusDors
Hygrobia hermanni
Scientific classification

Latreille, 1804
  • Hygrobia australasiae (Clark, 1862)
  • Hygrobia davidi Bedel, 1883
  • Hygrobia hermanni (Fabricius, 1775)
  • Hygrobia maculata Britton, 1981
  • Hygrobia nigra (Clark, 1862)
  • Hygrobia wattsi Hendrich, 2001


All species occur in lowland areas [4] and are mainly found in stagnant water.[5] They live in the mud, silt, and detritus of ponds.[4]

None of the species occur in sympatry, except for H. nigra and H. australasiae in south-eastern Australia.[6]

Both adults and larvae are predators, specialized on oligochaet worms. The adults feed for as long as 30 min, coming to the surface very briefly to renew the air-supply.[7]

Adults are able to stridulate, producing an audible sound,[8] which is why they are called squeak or screech beetles.


The body length ranges from 8.0 to 11.0 mm. Compound eyes are present, not divided into ventral and dorsal portions, strongly protruding. Labrum is short and transverse. The antennae are filiform, almost glabrous, with 11 segments.[5]

Phylogeny and evolution

The monophyly of the family is not in doubt.[6]

Hygrobiidae is thought to be the sister group to a clade comprising Dytiscidae (diving beetles), Amphizoidae (trout stream beetles) and Aspidytidae (cliff beetles), based on DNA sequence data.[6][9][10]

Regarding the relationships among the species of Hygrobia, a recent phylogenetic analysis suggested a sister group relationship between H. hermanni and a clade formed by the Australian species, with H. nigra sister to H. australasiae.[6]

Hygrobiidae probably diverged from other Hydradephagan clades around the time of the initial breakup of Pangea. The split between today’s Palearctic and Australian clades occurred later, possibly in the middle Mesozoic, by dispersal events.[6]

Species diversity and distribution

Hygrobia australasiae (Clark, 1862) - Australia

Hygrobia davidi Bedel, 1883 - Jiangxi, southeastern China

Hygrobia hermanni (Fabricius, 1775) - Europe, northern Africa (Morocco, Algeria and Tunisia), and Israel

Hygrobia maculata Britton, 1981 - Australia

Hygrobia nigra (Clark, 1862) - Australia

Hygrobia wattsi Hendrich, 2001 - Australia

Family name

There has been a controversy associated with deciding which is the valid family name of squeak beetles: Hygrobiidae or Paelobiidae.[1] Paelobiidae has priority over Hygrobiidae, but the latter name was until recently much more widely used.[11]


  1. ^ a b Nilsson, A. N. (2006). Which name is valid – Hygrobiidae or Paelobiidae? Latissimus 21 37-39.
  2. ^ Michat, M. C., et al. (2014). Description of the third instar of Hygrobia nigra (Clark, 1862) (Coleoptera: Paelobiidae), with a key for the identification of mature larvae of Hygrobia Latreille, 1804 and phylogenetic analysis. Zootaxa 3827(3) 318-30.
  3. ^ Watson, L. and M. J. Dallwitz. Hygrobia. British Insects: The Families of Coleoptera.
  4. ^ a b Dettner, K. (2005). Noteridae. Handbook of Zoology, 4, 72-90.
  5. ^ a b Holmen, M. (1987). Family Hygrobiidae. The aquatic Adephaga (Coleoptera) of Fennoscandia and Denmark. Brill, 136-142.
  6. ^ a b c d e Hawlitschek, O., Hendrich, L., & Balke, M. (2012). Molecular phylogeny of the squeak beetles, a family with disjunct Palearctic-Australian range. Molecular Phylogenetics and Evolution, 62(1), 550-554.
  7. ^ Balfour‐Browne, F. (1922, April). 5. The Life‐History of the Water‐Beetle Pelobius tardus Herbst. In Proceedings of the Zoological Society of London (Vol. 92, No. 1, pp. 79-97). Blackwell Publishing Ltd.
  8. ^ Jäch, M. (1995). Hygrobiidae (Coleoptera). In: Jäch, M.A., Ji, L. (Eds.), Water Beetles of China, vol. I. Zoologisch-Botanische Gesellschaft in Österreich und Wiener Coleopterologenverein, Wien, pp. 109–110.
  9. ^ Balke, M., Ribera, I., & Beutel, R. G. (2005). The systematic position of Aspidytidae, the diversification of Dytiscoidea (Coleoptera, Adephaga) and the phylogenetic signal of third codon positions. Journal of Zoological Systematics and Evolutionary Research, 43(3), 223-242.
  10. ^ Balke, M., Ribera, I., Beutel, R., Viloria, A., Garcia, M., & Vogler, A. P. (2008). Systematic placement of the recently discovered beetle family Meruidae (Coleoptera: Dytiscoidea) based on molecular data. Zoologica Scripta, 37(6), 647-650.
  11. ^ Lawrence, J. F., & Newton, A. F. (1995). Families and subfamilies of Coleoptera with selected genera, notes, references and data on family-group names.[pp. 779-1006].[in:] Biology, Phylogeny and Classification of Coleoptera. Papers celebrating the 80th birthday of Prof. Roy A. Museum i Instyut Zoologii PAN, Warzawa.

External links

Checklist of UK recorded Ichneumonidae

Checklist of UK recorded Ichneumonidae.

In this checklist are presented all wasp species of family Ichneumonidae.

H. maculata

H. maculata may refer to:

Haemanota maculata, a South American moth

Haplonerita maculata, a Venezuelan moth

Heteroscodra maculata, an African tarantula

Hippobosca maculata, a parasitic fly

Holbrookia maculata, a phrynosomid lizard

Horia maculata, a blister beetle

Hydroptila maculata, a purse-case caddisfly

Hygrobia maculata, an aquatic beetle

Hyla maculata, a tree frog

Hyperplatys maculata, a longhorn beetle

Hypochaeris maculata, a cat's ear

Hygrobia hermanni

Hygrobia hermanni the screech beetle is a species of beetle in family Hygrobiidae. It is found in the Palearctic (South Europe, West Europa, North Africa )

and is found in stagnant and muddy waters.It able to make a strident grating noise hence the name screech beetle.The sound is produced when the sharp edge of the 7th abdominal tergite is rubbed against a subapical median file on the elytral undersurface.


Hyptis is a genus of flowering plant in the family Lamiaceae. These plants, known commonly as bushmints, are widespread in tropical North and South America, as well as parts of West Africa. There are 300 to 400 species, which may be annual or perennial, and small herb to large shrub.

Selected species:

Hyptis alata - clustered bushmint, musky mint

Hyptis argutifolia

Hyptis atrorubens - marubio oscuro

Hyptis brevipes

Hyptis capitata - false ironwort, wild hops

Hyptis crenata - Brazilian mint

Hyptis diversifolia

Hyptis emoryi

Hyptis escobilla - bayamon

Hyptis florida

Hyptis goyazensis

Hyptis hirsuta

Hyptis hygrobia

Hyptis lantanifolia - island bushmint

Hyptis lappacea

Hyptis lorentziana

Hyptis pseudoglauca

Hyptis recurvata

Hyptis suaveolens

Hyptis velutina


Indigofera is a large genus of over 750 species of flowering plants belonging to the pea family Fabaceae. They are widely distributed throughout the tropical and subtropical regions of the world.

List of Justicia species

Justicia is a large, broadly distributed genus of flowering plants in the family Acanthaceae. As of January 2019, there are over 900 accepted species in Kew's Plants of the World Online.

List of beetles of Ireland

There are over 2,154 species of beetles species of Coleoptera native to Ireland. These are disposed in 84 families. By contrast there are 4,034 species of Coleoptera in the British Isles, consisting of 106 families . The largest beetle families in Ireland are the rove beetles (Staphylinidae) with 641 species, the weevils (Curculionidae) with 214 species, and the ground beetles (Carabidae) with 210 species.

List of rove beetle (Staphylinidae) species recorded in Britain

The following is a list of the rove beetles recorded in Great Britain. For other beetles, see List of beetle species recorded in Britain.


Tubuaia is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Achatinellidae.

Wiedemannia (fly)

Wiedemannia is a genus of flies in the family Empididae.

Extant Coleoptera families


This page is based on a Wikipedia article written by authors (here).
Text is available under the CC BY-SA 3.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.