Research Article |
Corresponding author: Hang Chen ( stuchen6481@gmail.com ) Academic editor: Roger Blackman
© 2021 Nawaz Haider Bashir, Weiwei Wang, Juan Liu, Wei Wang, Hang Chen.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Bashir NH, Wang W, Liu J, Wang W, Chen H (2021) First record of the lac-producing species Kerria nepalensis Varshney (Hemiptera, Kerriidae) from China, with a key to Chinese species. ZooKeys 1061: 1-9. https://doi.org/10.3897/zookeys.1061.73114
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Lac insects include astonishing species responsible for lac production. Lac is composed of resins, dyes, and shellac wax with significant economic importance. Previously, 11 species of the genus Kerria were reported from China, with the highest species diversity in Yunnan province. Another lac-producing species of the genus Kerria, namely Kerria nepalensis Varshney, is recorded for the first time in Yunnan province, China, on Dalbergia cochinchinensis Pierre ex Laness. (Fabaceae), a new host plant. In addition, a key to the 12 Kerria species recorded in China is also given.
Coccoidea, lac insects, Oriental China, taxonomy
Scale insects (Hemiptera, Coccoidea) are classified into 35 extant families, with more than 8300 described species to date (
No. | Species | Distribution | Reference |
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1 | Kerria albizziae (Green, 1911) | India, Myanmar, Sri Lanka |
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2 | Kerria brancheata Varshney, 1966 | India |
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3 | Kerria canalis Rajgopal, 2021 | India |
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4 | Kerria chamberlini Varshney, 1966 | Bhutan, China, India, Myanmar, Nepal, Thailand |
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5 | Kerria chinensis (Mahdihassan, 1923) | Bhutan, Cambodia, China, India, Myanmar, Nepal, Thailand, Vietnam |
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6 | Kerria communis (Mahdihassan, 1923) | India |
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7 | Kerria destructor Talukder & Das, 2020 | India |
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8 | Kerria dubeyi Ahmad & Ramamurthy, 2013 | India |
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9 | Kerria ebrachiata (Chamberlin, 1923) | India, Myanmar, Nepal, Pakistan |
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10 | Kerria fici (Green, 1903) | China, India, Pakistan, Thailand |
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11 | Kerria greeni (Chamberlin, 1923) | China, Philippine, Thailand |
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12 | Kerria indicola (Kapur, 1958) | India |
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13 | Kerria javana (Chamberlin, 1925) | India, Indonesia, Malaysia |
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14 | Kerria lacca (Kerr, 1782) | Azerbaijan, Bangladesh, China, Georgia, Guyana, India, Malaysia, Myanmar, Nepal, Pakistan, Sri Lanka, Thailand |
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15 | Kerria maduraiensis Ahmad & Ramamurthy, 2013 | India |
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16 | Kerria manipurensis Ahmad & Ramamurthy, 2013 | India |
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17 | Kerria mengdingensis Zhang, 1993 | China |
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18 | Kerria meridionalis (Chamberlin, 1923) | China, Philippines, Thailand |
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19 | Kerria nagoliensis (Mahdihassan, 1923) | Bangladeshi, India, Pakistan |
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20 | Kerria nepalensis Varshney, 1976 | China, India, Myanmar, Nepal |
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21 | Kerria pennyae Ahmad & Ramamurthy, 2013 | India |
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22 | Kerria pusana (Misra, 1930) | India, Indonesia, Malaysia, Myanmar |
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23 | Kerria rangoonensis (Chamberlin, 1925) | China, India, Indonesia, Myanmar, Thailand |
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24 | Kerria ruralis (Wang, Yao, Teui & Liang, 1982) | China |
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25 | Kerria sharda Mishra & Sushil, 2000 | India |
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26 | Kerria sindica (Mahdihassan, 1923) | Bangladesh, China, India, Pakistan |
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27 | Kerria thrissurensis Ahmad & Ramamurthy, 2013 | India |
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28 | Kerria varshneyi Ahmad & Ramamurthy, 2013 | India |
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29 | Kerria yunnanensis (Ou & Hong, 1990) | China |
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Lac insects are fully depending on their host plant and till now, more than 400 host plants have been recorded (
Herein, we redescribe and illustrate K. nepalensis Varshney, a species recorded for the first time from Yunnan province and China. We also provide a key to the 12 Chinese species of Kerria.
Twigs bearing K. nepalensis (new record) were collected by Dr Juan Liu from roadside Dalbergia cochinchinensis trees at Mengzi city (22°56'N, 103°32'E), Yunnan province, China, on 15 September 2020. Fresh samples of adult females were preserved in 75% ethanol. Specimens were placed in 10% KOH for few hours and rinsed in 5–8 changes of distilled water for preparation of permanent slides as described previously (
More than 10 individuals were selected for observation under electron microscope. The dehydration of specimens was accomplished by passing through a series of increasing alcohol concentrations as 30%, 50%, 70%, 80%, 90%, and 95% alcohol (
Order Hemiptera Linnaeus, 1758
Suborder Sternorrhyncha Amyot & Audinet-Serville, 1843
Superfamily Coccoidea Handlirsch, 1903
Family Kerriidae Lindinger, 1937
China: Yunnan: Mengzi city, 22°56'N, 103°32'E, 15.IX.2020, coll. Juan Liu, Dalbergia cochinchinensis (Fabaceae), 5 slides (10 adult ♀♀).
Adult female: body generally large globular to elongate in shape, 1.7–3.87 mm long, 1.16–2.42 mm wide (Fig.
Dorsum. Anal tubercle well developed, elongate, 320–1100 µm long, 170–680 µm wide, apparently two-segmented (Figs
Venter. Antennae very small, conical shaped, probably one segmented, with 4 fleshy and 2 short hair-like setae (Fig.
Kerria nepalensis scanning electron micrographs A anal ring setae B anal tubercle and dorsal spine C perivulvar pore cluster D magnified single perivulvar pore E brachia F brachial plate with dimples G anterior spiracle H a marginal duct cluster I a magnified marginal duct cluster J antenna K dorsal spine L mouthparts. Scale bars: 10 µm (D), 30 µm (I, J), 100 µm (A, F, L), 200 µm (G, H, K), 300 µm (E), 500 µm (B, C).
India, Myanmar, Nepal (
Dalbergia cochinchinensis (specimens collected in this study), Litchi chinensis (
1 | Anal tubercle (supra anal plate) elongate, distinctly longer than broad | 2 |
– | Anal tubercle (supra anal plate) abbreviated, length subequal to width or broader than long | 6 |
2 | Canellar pore bands present as a chitinous extension below anterior spiracles | 3 |
– | Canellar pore bands absent | 4 |
3 | Canellar pore bands below anterior spiracles short, 150–300 µm long; dorsal spine 170–190 µm long | K. nepalensis Varshney |
– | Canellar pore bands below anterior spiracles very long, 300–500 µm long; dorsal spine 190–240 µm long | K. chinensis (Mahdihassan) |
4 | Length of brachia subequal or shorter than length of supra anal plate | K. chamberlini Varshney |
– | Length of brachia distinctly greater than length of supra anal plate | 5 |
5 | Supra anal plate smooth; brachial plate with 10–12 distinct dimples; each marginal duct cluster with 25–30 ducts | K. lacca (Kerr) |
– | Supra anal plate hispid; brachial plate with 8–15 indistinct dimples; each marginal duct cluster with 30–36 ducts | K. yunnanensis (Ou & Hong) |
6 | Each marginal duct cluster with 70–75 ducts; distance between anterior spiracle and brachial plate 17–34 μm | K. mengdingensis Zhang |
– | Each marginal duct cluster with more than 20 ducts; distance between anterior spiracle and brachial plate greater than 34 μm | 7 |
7 | Brachial plate diameter equal or greater than length of supra anal plate | 8 |
– | Brachial plate diameter distinctly less than length of supra anal plate | 10 |
8 | Brachial tube 65–90 µm long; anterior spiracles 180–260 µm long | K. ruralis (Wang, Yao, Teui & Liang) |
– | Brachial tube 170–340 µm long; anterior spiracles 130–180 µm long | 9 |
9 | Brachial crater not in center of plate, found near the margin; dimples obscure and small; crater rim open | K. sindica (Mahdihassan) |
– | Brachial crater in center of plate; dimples large and distinct; crater rim closed | K. fici (Green) |
10 | Brachial crater not well defined; number of perivulvar pore clusters 68–70 | K. rangoonensis (Chamberlin) |
– | Brachial crater well defined; number of perivulvar pore clusters less than 60 | 11 |
11 | Marginal duct clusters duplex, with large nuclear ducts; number of perivulvar pore clusters 58 | K. greeni (Chamberlin) |
– | Marginal duct clusters simplex, no large nuclear ducts present; number of perivulvar pore clusters less than 50 | K. meridionalis (Chamberlin) |
Kerria nepalensis was identified and described on host Litchi chinensis from India and Nepal by
The presence of K. nepalensis in Yunnan province increases the number of known Kerria species in China that could be used for lac production. The natural lac-plant resources are abundant in Yunnan Province (
This project is funded by the National Natural Science Foundation of China (grant no. 31772542) and the Program of Innovative Team of Yunnan Province (202005AE160011).