Icerya Signoret, 1876

Joshi, Sunil & Navik, Omprakash, 2021, A new species of Icerya Signoret (Hemiptera: Coccomorpha: Monophlebidae) and a key to species of the genus found in India, Zootaxa 4920 (2), pp. 200-210 : 209

Key to the adult females of species of Icerya Signoret found in India

Some couplets are adopted from the key by Unruh & Gullan (2008b).

1(0) Open-centre pores present.............................................................................. 2

– Open-centre pores absent.............................................................................. 8

2(1) Antenna with fewer than 11 segments..................................................................... 3

– Antenna with 11 segments.............................................................................. 4

3(2) Antenna with 8 or 9 segments. Ovisac band present. Open-centre pores with sclerotized outer rim and 6–8 small, widely spaced outer loculi.............................................................................. I. pilosa Green

– Antenna with 9 segments. Ovisac band absent. Open-centre pores each with a highly chitinised outer rim and 5 or 6 much smaller, widely spaced outer loculi........................................................... I. kumari (Rao)

4(2) Open-centre pores each with an internal triangular projection on rim. ...................... I. seychellarum (Westwood)

– Open-centre pores each without an internal triangular projection on rim.......................................... 5

5(4) With one cicatrix..................................................................................... 6

– With three cicatrices................................................................................... 7

6(5) Open-centre pores each with 14–16 outer loculi; ovisac band containing 5 types of pores........ I. formicarum Newstead

– Open-centre pores each with 18–24 loculi; ovisac band containing 2 types of pores...................... I. menoni Rao

7(5) Abdominal spiracles numbering 2 pairs.................................................... I. purchasi Maskell

– Abdominal spiracles numbering 3 pairs.. ...................................................... I. crocea Green

8(1) Ovisac band absent................................................................................... 9

– Ovisac band present.................................................................................. 10

9(8) Ventral margin and submargin of head and thorax with simple multilocular pores, each with a bilocular centre.............................................................................................. I. travancorensis Rao

– Ventral margin and submargin of head and thorax with simple multilocular pores, each with a trilocular centre................................................................................................... I. jaihind (Rao)

10(8) With only 1 cicatrix................................................................ I. aegyptiaca (Douglas)

– With 3 cicatrices.................................................................................... 11

11(10) Marginal region and dorsum with simple multilocular pores, each with a bilocular centre that is not dumbbell shaped... 12

– Only marginal region with simple multilocular pores, each with dumbbell-shaped bilocular centre.................... 14

12(11) Ovisac band containing multilocular pores each having a trilocular centre and 6 or 7 outer loculi with stalked profile.......................................................................................... I. assamensis (Rao)

– Ovisac band containing multilocular pores, each with either a quadrilocular or a quinquelocular centre and 8 outer loculi without stalked profile................................................................................... 13

13(12) Dorsal surface with many simple multilocular pores, each with a quinquelocular or hexalocular centre and 4–6 outer loculi......................................................................................... I. minor Green

– Dorsal surface with very few simple multilocular pores, each with a quinquelocular or hexalocular centre and 4–6 outer loculi................................................................................... I. pulchra (Leonardi)

14(11) Ovisac band 3–5 pores wide, containing 4 types of pore: larger simple multilocular pores with bilocular or rarely trilocular centres; and smaller simple multilocular pores with bilocular or trilocular centres. Venter of each thoracic segment with simple multilocular pores, similar to genital pores, forming a submarginal band and a transverse row across segment.............................................................................................. I. zimmermanni Green

– Ovisac band 6–8 pores wide, containing 5 types of pore: larger simple multilocular pores of 3 types, with unilocular or trilocular, or rarely quadrilocular centres respectively; and smaller simple multilocular pores with unilocular centers, of 2 types; one with 6 funnel-shaped outer loculi, and the other with 6 or 7 oval outer loculi. Simple multilocular pores similar to genital pores present only in genital and anal areas. Venter of each thoracic and abdominal segments with submarginal band of simple multilocular pores, each with an unilocular centre and 10 to 14 outer loculi; each segment without any transverse row of pores.............................................................................. I. viraktamathi Joshi sp. n.