Kerria Targioni Tozzetti, 1884

Rajgopal, N. N., Mohanasundaram, Arumugam & Sharma, Kewal Krishan, 2021, A new species of lac insect in the genus Kerria Targioni Tozzetti (Hemiptera Coccomorpha: Tachardiidae) on Samanea saman (Fabaceae) from India, Zootaxa 4938 (1), pp. 60-68 : 65-66

Key to the species of Kerria Targioni Tozzetti, 1884 based on adult female

(emendation of earlier keys in Ahmad et al. 2013 b and Talukder & Das 2020). The key does not necessarily reflect phylogenetic relationships.

1(0) Anal tubercle (supra-anal plate) elongate, distinctly longer than wide............................................ 2

- Anal tubercle (supra-anal plate) abbreviated, length subequal to width or wider than long........................... 12

2(1) Each brachial plate situated on an elevated brachium......................................................... 3

- Each brachial plate sessile, situated on body surface..................................... K. ebrachiata (Chamberlin)

3(2) Trailing canellar band present as a sclerotised extension below each anterior spiracle................................ 4

- Trailing canellar bands absent........................................................................... 5

4(3) Distance of anterior spiracle from brachial plate 2x width of brachial plate. Anterior spiracle with apodeme shorter (137–172 μm) than length of brachial plate (172–206 μm). Dorsal spine 189–224 μm long.............. K. chinensis (Mahdihassan)

- Distance of anterior spiracle from brachial plate 1.2x width of brachial plate. Anterior spiracle with apodeme longer (258–310 μm) than length of brachial plate (103–137 μm). Dorsal spine 172–189 μm long................. K. nepalensis Varshney

5(3) Length of brachium distinctly greater than length of supra-anal plate............................................. 6

- Length of brachia subequal to or shorter than length of supra-anal plate......................................... 10

6(5) With 8 or 9 perivulvar pore clusters on each side. Posterior spiracle 75–90 μm long, without a sclerotised plate............................................................................... K. maduraiensis Ahmad & Ramamurthy

- With more than 10 perivulvar pore clusters on each side. Posterior spiracle>90 μm long, with a sclerotised plate......... 7

7(6) Each brachium club-shaped. Anterior spiracle with apodeme shorter than width of brachial plate............................................................................................. K. varshneyi Ahmad & Ramamurthy

- Each brachium cylindrical. Anterior spiracle apodeme longer than width of brachial plate............................ 8

8(7) Each brachial plate with 10–12 distinct dimples. Each marginal duct cluster containing 25–30 ducts. Supra-anal plate smooth........................................................................................ K. lacca (Kerr)

- Each brachial plate with 4–12 indistinct dimples. Each marginal duct cluster containing>30 ducts. Supra-anal plate hispid... ................................................................................................... 9

9(8) Each brachial plate with 5 or fewer indistinct dimples; brachial crater 200–245 μm wide. Each marginal duct cluster containing 49–53 ducts and surrounded by sclerotisation................................ K. thrissurensis Ahmad & Ramamurthy

- Each brachial plate with 10–12 indistinct dimples; brachial crater 110–175 μm wide. Each marginal duct cluster with <40 ducts and without any surrounding sclerotisation........................................... K. yunnanensis Ou & Hong

10(5) Dorsal spine shorter than width of brachial crater. Supra-anal plate hispid. Antennae each with 4 apical setae.................................................................................................. K. indicola (Kapur)

- Dorsal spine longer than width of brachial crater. Supra-anal plate smooth. Antennae each with 3 apical setae........... 11

11(10) Each marginal duct cluster containing 28–32 ducts. Anterior spiracle 65–165 μm from brachial plate. Pedicel of dorsal spine subequal in length to, or longer than spine....................................... K. pennyae Ahmad & Ramamurthy

- Each marginal duct cluster with 33–40 ducts.Anterior spiracle touching brachial plate. Pedicel of dorsal spine distinctly shorter than spine........................................................................ K. chamberlini Varshney

12(1) Distance of anterior spiracle from brachial plate 17–34 μm. Each marginal duct cluster containing 10–15 ducts on an ovate reticulate plate........................................................................ K. albizziae (Green)

- Distance of anterior spiracle from brachial plate>34 μm. Each marginal duct cluster containing more than 20 ducts, without an ovate reticulate plate.................................................................................. 13

13(12) Brachial plate diameter equal to or greater than length of supra-anal plate........................................ 14

- Brachial plate diameter distinctly less than length of supra-anal plate........................................... 19

14(13) Brachial plate with crater not situated centrally; crater rim open; dimples small and obscure...... K. sindica (Mahdihassan)

- Brachial crater situated at centre of plate; crater rim closed; dimples large and distinct............................... .................................................................................................. 15

15(14) Brachial plate large, 315–365 μm in diameter. Each marginal duct cluster containing 24–26 ducts surrounded by sclerotisation. Perivulvar pore clusters numbering 7 or 8 on each side.............................. K. dubeyi Ahmad & Ramamurthy

- Brachial plate smaller (<315 μm in diameter). Each marginal duct cluster containing>26 ducts, with or without sclerotisation. Perivulvar pore clusters numbering> 8 on each side......................................................... 16

16(15) Brachial plate 189–310 μm in diameter. Antenna 42–50 μm long..................................... K. fici (Green)

- Brachial plate <180 μm in diameter. Antenna less than 40 μm long............................................. 17

17(16) Each brachium elevated, cylindrical. Dorsal spine distinctly shorter than length of pedicel.............. K. pusana (Misra)

- Each brachium elevated, club-shaped. Dorsal spine subequal to or longer than pedicel.............................. 18

18(17) Length of brachium subequal to that of supra-anal plate. Distance of anterior spiracle from brachial plate 206–325 μm.................................................................................... K. sharda Mishra & Sushil

- Length of brachium distinctly greater than that of supra-anal plate. Distance of anterior spiracle from brachial plate 189–205 μm............................................................................... K. brancheata Varshney

19(13) Brachial crater not defined. Perivulvar pore clusters numbering 68–70 in total............. K. rangoonensis (Chamberlin)

- Brachial crater well defined. Perivulvar pore clusters numbering fewer than 60 in total............................. 20

20(19) Marginal duct clusters of duplex type, with large nuclear and small secondary ducts. Perivulvar pore clusters numbering 58 in total.............................................................................. K. greeni (Chamberlin)

- Marginal duct clusters of simplex type, without any large nuclear ducts. Perivulvar pore clusters numbering fewer than 50 in total............................................................................................... 21

21(20) Each marginal duct cluster situated on a weakly marked, oval, sclerotised plate. Many of the perivulvar pore clusters more-orless grouped together to form somewhat larger clusters, i.e. secondarily clustered............ K. meridionalis (Chamberlin)

- Marginal duct cluster not situated on a weakly marked, oval, sclerotised plate. Perivulvar pore clusters not grouped to form secondary clusters.................................................................................... 22

22(21) Marginal duct clusters surrounded by sclerotisation. Rough trailing canellar bands present as a chitinous extension below each anterior spiracle................................................................ K. canalis Rajgopal sp. nov.

- Marginal duct clusters not surrounded by sclerotisation. Rough trailing canellar bands, as a chitinous extension below each anterior spiracle, absent............................................................................... 23

23(22) Each brachial plate circular, with 6–9 dimples. Mouthparts not associated with any quinquelocular pores............................................................................................. K. destructor Talukder & Das

- Each brachial plate quadrate/rectangular, with 4 or 5 dimples. Mouthparts associated with quinquelocular pores......... 24

24(23) Length of dorsal spine equal to width of brachial plate. Anterior spiracle shorter than or equal to width of brachial plate. Antennae each 1 segmented, with 4 long setae on apex.......................................... K. javana (Chamberlin)

- Length of dorsal spine 1.16x longer than width of brachial plate. Anterior spiracle 1.3x longer than width of brachial plate. Antennae each 3 segmented, with 3 long setae on apex........................ K. manipurensis Ahmad & Ramamurthy