Coccus, Linnaeus, 1758

Cao, Tong, Watson, Gillian W., Hodgson, Chris J., Jing, Qi & Feng, Ji-Nian, 2022, The genera Coccus and Prococcus (Hemiptera: Coccomorpha: Coccidae) in China with two new combinations and descriptions of two new species, Zootaxa 5087 (1), pp. 112-128 : 126

Key to adult female Coccus species found in China

1(0) Entire ventral submargin with crowded tubular ducts......................................................... 2

- If ventral submargin with crowded tubular ducts, these present along only part of submargin.......................... 3

2(1) Antenna 6 segmented. Spiracular clefts each containing 3 spiracular setae. Tibio-tarsal sclerotizations present. Median areas of thoracic segments without ventral tubular ducts......................................... takanoi Takahashi, 1932

- Antenna 8 segmented. Spiracular clefts each containing 3‒8 spiracular setae. Tibio-tarsal sclerotizations absent. Ventral tubular ducts present on medial areas of pro-, meso- and metathorax.......................... multisetus Wang & Feng, 2012

3(1) Dorsal setae all slender, tapered and obviously curved. Multilocular disc pores mostly each with 7 loculi............................................................................................... longulus ( Douglas, 1887)

- Dorsal setae more robust, straight or only slightly curved near apex. Multilocular disc pores each with 7‒14 loculi........ 4

4(3) Dorsal submargin with tubular ducts around entire body, totaling 24‒31. Dorsal tubular ducts with outer ductules much wider than those of ventral tubular ducts..................................................... moestus De Lotto, 1959

- Dorsal submarginal tubular ducts absent or, if present, many fewer and confined to abdominal segments only. Dorsal tubular ducts with outer ductules narrower than those of ventral tubular ducts............................................ 5

5(4) Dorsal setae blunt, cylindrical or capitate or clavate.......................................................... 6

- Dorsal setae sharply or dully pointed, either conical or robust and slightly tapered distally............................ 9

6(5) Ventral tubular ducts each with inner ductule short and about as wide as, or much wider than outer ductule.............. 7

- Ventral tubular ducts each with inner ductule long and much narrower than outer ductule............................ 8

7(6) Ventral tubular ducts each with inner ductule short and inflated, much wider than outer ductule. Ventral tubular ducts absent from abdominal segments............................................................ asiaticus ( Green, 1896)

- Ventral tubular ducts each with long inner ductule almost as wide as outer ductule. Ventral tubular ducts present medially on abdominal segment II................................................................ viridis ( Green, 1889)

8(6) Dorsal setae cylindrical. Ventral tubular ducts present on mesothorax, on medial area and by mesocoxa, absent from abdominal submargin. Anal plates together slightly longer than wide.............. praetermissus Lin & Tanaka in Lin et al., 2017

- Dorsal setae capitate. Ventral tubular ducts absent from thorax, but a few present on abdominal submargin. Anal plates together obviously longer than wide, with posterolateral margins obviously longer than anterolateral margins................................................................................................... capparidis ( Green, 1904)

9(5) Preopercular pores absent.............................................................................. 10

- Preopercular pores present in a group anterior to anal plates.................................................. 11

10(9) Anal plates each with a discal seta. Ventral tubular ducts entirely absent. Multilocular disc pores each with mainly 7 loculi. Ano-genital fold with anterior margin setae numbering 3 pairs....................... nanningensis Cao & Feng , sp. n.

- Anal plates each without a discal seta. Ventral tubular ducts sparsely present laterad to each metacoxa. Multilocular disc pores each with mainly 10 loculi. Ano-genital fold with anterior margin setae numbering 2 pairs....... discrepans ( Green, 1904)

11(9) Ventral tubular ducts present, either submarginally on abdomen or medially on thorax.............................. 12

- Ventral tubular ducts usually absent, occasionally present on mesothorax............... cephalotaxus Cao & Feng , sp. n.

12(11) Ventral multilocular disc pores present on all abdominal segments. Ventral tubular ducts restricted to submedial areas on abdomen, absent from medial areas of thorax. Submarginal tubercles absent............ pseudomagnoliarum ( Kuwana, 1914)

- Ventral multilocular disc pores restricted to abdominal segment VII, or VI and VII. Ventral tubular ducts present medially on thorax. Submarginal tubercles present or absent............................................................ 13

13(12) Dorsal setae all sharply setose. Submarginal tubercles absent. Antennal segments all short, often shorter than segmental width. Ventral tubular ducts numerous near mouthparts and medially on pro- and mesothorax........... formicarii ( Green, 1896)

- Dorsal setae each with approximately parallel sides and a dully pointed apex. Submarginal tubercles present. Antennal segments all quite long, most clearly longer than segmental width. Ventral tubular ducts very few or absent from near mouthparts but present medially on mesothorax................................................. hesperidum Linnaeus, 1758