Hyphydrus lyratus

Hydrovatus lyratus, is a species of predaceous diving beetle widespread in South Asia, South East Asia and Australian region.[1][2]

Hydrovatus lyratus
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Insecta
Order:
Coleoptera
Suborder:
Adephaga
Superfamily:
Dytiscoidea
Family:
Dytiscidae
Genus:
Hydrovatus
Species:
H. lyratus
Binomial name
Hydrovatus lyratus
Sharp, 1882
Synonyms
  • Hyphydrus (Apriophorus) flavicans Régimbart, 1892
  • Hyphydrus (Apriophorus) lyratus flavicans Regimbert, 1892
  • Hyphydrus flavicans Régimbart, 1892
  • Hyphydrus bisulcatus Clark, 1863
  • Hydroporus fossulipennis W.J.Macleay, 1871
  • Hyphydrus nigronotatus Clark, 1863

Subspecies

Four subspecies have been identified.[3]

  • Hyphydrus lyratus flavicans Régimbart, 1892 - India, Pakistan, Sri Lanka
  • Hyphydrus lyratus foveolatus Régimbart, 1892 - Papua New Guinea[4]
  • Hyphydrus lyratus lyratus Swartz, 1808 - India, Andaman & Nicobar Islands, Myanmar, Sri Lanka; China, Indonesia, Japan, Taiwan, Thailand, Vietnam; Australian region.
  • Hyphydrus lyratus xanthomelas Régimbart, 1877 - Malaysia[5]

Biology

Third instar has a fusiformate body with elongated frontoclypeus. Lateral notches are absent and gular sutures are fused. Siphon elongated, acute apically, with secondary spines. Head length is 1.03 to 1.29 mm. Cephalic capsule pear-shaped, and tapering posteriorly. Cephalic capsule is mainly creamy white to pale yellow i color dorsally, with a longitudinal brownish stripe laterally. Antenna with four-segments, and slightly shorter than head capsule. Mandibles are falciform, and narrow. Pronotum trapezoidal dorsally, and ovate laterally. Pronotum creamy white to pale yellow. Legs are with five segments and pale yellow to pale brown in color. Abdomen consists with eight segments.[6]

Adult beetle has longer smooth-edged metatibial spine. The second sternite of male has a sharp, backwardly projecting process. In female, disc of elytron has a distinct, longitudinal groove.[7] Protarsi and mesotarsi are similarly expanded. Ventrite 2 consists with a midline large spine. Elytron lacks a macula.[8]

References
  1. "Catalogue of the diving beetles of India and adjacent countries (Coleoptera: Dytiscidae)". Skörvnöpparn, Umeå Supplement 3, 2012: 1-77. Retrieved 2021-08-07.
  2. Biström, O.; Balke, M.; Hendrich, L. (1993-11-01). "A new species of Hyphydrus Illiger 1802 (Coleoptera Dytiscidae) from West New Guinea, and notes on other species of the genus". Tropical Zoology. 6 (2): 287–298. doi:10.1080/03946975.1993.10539229. Retrieved 2021-08-10.
  3. "Hyphydrus lyratus Swartz, 1808". www.gbif.org. Retrieved 2021-08-10.
  4. Biström, O.; Balke, M.; Hendrich, L. (1993-11-01). "A new species of Hyphydrus Illiger 1802 (Coleoptera Dytiscidae) from West New Guinea, and notes on other species of the genus". Tropical Zoology. 6 (2): 287–298. doi:10.1080/03946975.1993.10539229. Retrieved 2021-08-10.
  5. "New species and new records of Hyphydrus ILLIGER, 1802 from South-East Asia (Coleoptera: Dytiscidae)" (PDF). Koleopterologische Rundschau 77 67–80 Wien, Juli 2007. Retrieved 2021-08-07.
  6. Alarie, Yves; Watts, Chris H S (August 2005). "Larvae of four species of the Hyphydrus lyratus species-group (Coleoptera: Dytiscidae: Hydroporinae)". Australian Journal of Entomology. 44 (3): 244–251. doi:10.1111/j.1440-6055.2005.00481.x. Retrieved 2021-08-10.
  7. "DYTISCIDAE: III. The Hyphydrus ILLIGER species of China (Coleoptera)" (PDF). M.A. JACH & L. Ji (cds.): Water Beetles of China Vol. II 93 - 100 Wien, December 1998. Retrieved 2021-08-07.
  8. "Notes on Australian Hyphydrus ILLIGER, including taxonomy, key to the species and sexual dimorphism (Coleoptera: Dytiscidae)" (PDF). Koleopterologische Rundschau 76 15–21 Wien, Juli 2006. Retrieved 2021-08-07.


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