Hyphydrus lyratus explained

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

Subspecies

Four subspecies have been identified.[3]

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]

Notes and References

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

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