Hyphydrus, Illiger, 1802

Ghosh, Sujit Kumar, 2021, A new species of genus Hyphydrus Illiger (Coleoptera: Dytiscidae: Hyphydrini) from Arunachal Pradesh, India, Records of the Zoological Survey of India 121 (4), pp. 441-445 : 444

Key to the species of genus Hyphydrus from India

1 Elytral punctation uniform of one type ( H. lyratus species group) ....................................................................... 2

– Elytral punctation of two types ( H. signatus species group) ................................................................................ 3

2 Markings on elytra as in Biström (1982, Figure 16a) ...................................................................... H. lyratus lyratus

– Markings on elytra as in Biström (1982, Figure 18) .............................................................. H. lyratus flavicans

3 Difference between two kinds of elytral punctures bigger...................................................................................... 4

– Difference between two kinds of elytral punctures smaller ................................................................................ 7

4 Lateral lobes of penis with sides posteriorly almost parallel.................................................................................... 5

– Lateral lobes of penis with sides posteriorly not parallel ............................................................................................. 6

5 Base of penis with hooked process straight aedeagus; incision of penis relatively narrow lateral lobe of penis slight elevated apically; spermatheca and aedeagus as in Biström (1982, Figure 91b-d, e)....................... H. sumatrae

– Base of penis with sharply curved hooked process; incision of penis relatively deep; lateral lobe of penis straight apically; spermatheca and aedeagus as in Figures 1 to 7......................................... H. biswasi sp. nov.

6 Tarsi pale; aedeagus as Biström (1982, Figure 97b-e) .................................................................................. H. renardi

– Tarsi partly darkened (in few specimens pale); aedeagus as Biström (1982, Figure 98b-e) ....................................................................... H. birmanicus

7 Elytra with very dense punctation, interstices between punctures smaller than diameters of punctures; lateral lobes of penis apically curved outwards; aedeagus as Biström (1982, Figure 94b-d) ...................... H. intermixtus

– Elytra with sparser punctation, interstices between punctures bigger than diameters of punctures; lateral lobes of penis apically not curved outwards; aedeagus as Biström (1982, Figure 89b-d) .................................................................. H. gschwendtneri

Figures

Figures 1-7. Hyphydrus biswasi Ghosh sp. nov. (holotype, male). (1) male habitus; (2) Protanchter; (3) Penis in ventral view (dry); (4) Apex of penis (in alcohol; arrow showing lateral seta); (5) Penis in lateral view (dry); (6) Right paramere; (7) Spermetheca.