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Issue: Vol. 5646 No. 2: 9 Jun. 2025
Type: Article
Published: 2025-06-09
DOI: 10.11646/zootaxa.5646.2.1
Page range: 151-198
Abstract views: 54
PDF downloaded: 3

Revision of the soft scale genus Platylecanium (Hemiptera: Coccomorpha: Coccidae), with descriptions of eight new species

Department of Biodiversity and Biological Systematics; The National Museum of Wales; Cardiff; CF10 3NP; U.K.
Hemiptera new species new synonymy new lectotype designation nymphal descriptions

Abstract

The soft scale insect genus Platylecanium Cockerell & Robinson (Hemiptera: Coccomorpha: Coccidae) is member of a group of genera in the tribe Paralecaniinae that have “clear areas” located mediolaterally on the abdomen and polygonal plates on the dorsum delineated by lines of setae and microducts, namely, Paralecanium Cockerell, Discochiton Hodgson & Williams, Insularicoccus Hodgson & Williams and Platylecanium. The species in Platylecanium have never been revised and their character-states are mostly poorly understood as most were described a long time ago and are currently unrecognisable. The purpose of this revision is to: (i) clarify the morphological boundaries of the genus, and (ii) outline how it differs from the other closely similar genera. The present revision, based on the morphology of the adult females, redescribes and illustrates 7 of the 10 species previously included in the genus; unfortunately, type material of three species (P. cyperi Takahashi, P. elongatum Takahashi and P. riouwense Takahashi) was not available. Eight species are described as new, namely: P. coelogyne Hodgson, P. dendrobii Hodgson, P. eastopi Hodgson, P. faveolatum Hodgson, P. palmae Hodgson, P. sarawakense Hodgson, P. vanda Hodgson and P. watsoniae Hodgson spp. nov. The second-instar male and second-instar female of P. vanda are also described and illustrated. In addition, it is argued that asymmetry should not be used as a species diagnostic character in the Coccidae, so P. cocotis Laing is here considered to be a junior synonym of P. asymmetricum Morrison syn. nov. as it appears to be otherwise identical. Keys are provided for separating: (i) Platylecanium from the closely related genera Discochiton, Insularicoccus and Paralecanium, based on adult female morphology; and (ii) the 17 species now recognised in the genus. A lectotype is designated for P. fusiforme Green.

 

References

  1. Ali, S.M. (1971) A catalogue of the Oriental Coccoidea. Part V. Insecta: Homoptera: Coccoidea (with an index). Indian Museum Bulletin, 6, 7‒82.
  2. Brummitt, R.K. (1992) Vascular Plant Families and Genera. Royal Botanic Gardens, Kew, 804 pp.
  3. Buchner, P. (1965) Endosymbiosis of animals with plant-like microorganisms. John Wiley & Sons, New York, 909 pp.
  4. Cockerell, T.D.A. & Robinson, E. (1915) Descriptions and records of Coccidae. Bulletin of the American Museum of Natural History, 34, 105‒113.
  5. Cockerell, T.D.A. & Robinson, E. (1915a) Descriptions and records of Coccidae. Bulletin of the American Museum of Natural History, 34, 423‒428.
  6. Danzig, E.M. & Konstantinova, G.M. (1990) [On coccid (Homoptera, Coccinea) fauna of Vietnam.] Trudy Zoologicheskogo Instituta Akademiya Nauk SSSR. Leningrad, 209, 38‒52.
  7. García Morales, M., Denno, B.D., Miller, D.R., Miller, G.L., Ben-Dov, Y. & Hardy, N.B. (2016) ScaleNet: a literature-based model of scale insect biology and systematics. Database. Available from: http://scalenet.info/ (accessed 4 March 2025) https://doi.org/10.1093/database/bav118
  8. Green, E.E. (1922) Supplementary notes on the Coccidae of Ceylon. Part IV. Journal of the Bombay Natural History Society, 28, 1007‒1020.
  9. Green, E.E. (1937) An annotated list of the Coccidae of Ceylon, with emendations and additions to date. Ceylon Journal of Science Section B. Zoology and Geology, 20, 277‒334.
  10. Gruwell, M.E., von Dohlen, C., Patch, K. & Normark, B.B. (2005) Preliminary PCR survey of bacteria associated with scale insects (Hemiptera: Coccoidea). Proceedings of the X International Symposium on Scale Insect Studies, held at Plant Protection Research Institute, Adana/ Turkey, 19‒23 April 2004. Adana Zirai Muscadele Arastirma Enstitusu. Adana, Turkey, 408 pp.
  11. Gruwell, M.E., Morse, G.E. & Normark, B.B. (2007) Phylogenetic congruence of armored scale insects (Hemiptera: Diaspididae) and their primary endosymbionts from the phylum Bacteroidetes. Molecular Phylogenetics and Evolution, 44, 267‒280. https://doi.org/10.1016/j.ympev.2007.01.014
  12. Gullan, P.J. & Cook, L.G. (2007) Phylogeny and higher classification of the scale insects (Hemiptera: Sternorrhyncha: Coccoidea). Zootaxa, 1668 91), 413‒425. https://doi.org/10.11646/zootaxa.1668.1.22
  13. Gullan, P.J. & Kosztarab, M.P. (1997) Adaptations in scale insects. Annual Review of Entomology, 42, 23‒50. https://doi.org/10.1146/annurev.ento.42.1.23
  14. Hodgson, C.J. (1994) The Scale Insect Family Coccidae: an identification manual to genera. CAB International, Wallingford, 639 pp.
  15. Hodgson, C.J. (2014) Phenacoleachia, Steingelia, Pityococcus and Puto–Neococcoids or Archaeococcoids? An intuitive phylogenetic discussion based on adult male characters. Acta Zoologica Bulgarica Supplement, 6, 41‒50.
  16. Hodgson, C.J. (2023) Redescriptions of five of Takahashi’s soft scale species (Hemiptera: Coccomorpha: Coccidae) with comments on their status and relationships. Zootaxa, 5230 (5), 549–564. https://doi.org/10.11646/zootaxa.5230.5.3
  17. Hodgson, C.J. & Williams, D.J. (2018) Revision of the soft scale genus Paralecanium (Hemiptera: Coccomorpha: Coccidae) with the introduction of three new genera and twenty new species. Zootaxa, 4443 (1), 1–162. https://doi.org/10.11646/zootaxa.4443.1.1
  18. Joshi, S. & Firake, D.M. (2019) First record of Platylecanium nepalense Takagi (Hemiptera: Coccomorpha: Coccidae) from India, with redescription and a key to the species of Platylecanium Cockerell & Robinson. Phytoparasitica, 48, 35–41. https://doi.org/10.1007/s12600-019-00767-6
  19. Laing, F. (1925) Descriptions of some new genera and species of Coccidae. Bulletin of Entomological Research, 16, 51‒66. https://doi.org/10.1017/S0007485300056157
  20. Miller, D.R. & Davidson, J.A. (1990) 3.1.1 A List of the Armored Scale Insect Pests. In: Rosen, D. (Ed.), Armored Scale Insects, Their Biology, Natural Enemies and Control [Series title: World Crop Pests, Vol. 4B]. Elsevier, Amsterdam, pp. 299‒306.
  21. Miller, D.R., Miller, G.L., Hodges, G.S. & Davidson, J.A. (2005) Introduced scale insects (Hemiptera: Coccoidea) of the United States and their impact on U.S. Agriculture. Proceedings of the Entomological Society of Washington, 107 (1), 123‒158.
  22. Miller, G.L. & Williams, M.L. (1997) 1.1.2.3 The male test. In: Ben-Dov, Y. & Hodgson, C.J. (Eds,), Soft Scale Insects: Their Biology, Natural Enemies and Control. Vol. 7A. Elsevier, Amsterdam and New York, pp. 49‒54. https://doi.org/10.1016/S1572-4379(97)80043-7
  23. Morrison, H. (1921) Some non-diaspine Coccidae from the Malay peninsula, with descriptions of apparently new species. The Philippine Journal of Science, 18, 637‒677.
  24. Normark, B.B. (2003) The evolution of alternative genetic systems in insects. Annual Review of Entomology, 48, 397‒423. https://doi.org/10.1146/annurev.ento.48.091801.112703
  25. Nur, U. (1980) Evolution of unusual chromosome systems in scale insects (Coccoidea: Homoptera). Insect Cytogenetics. Royal Entomological Society, London, 278 pp.
  26. Ross, L., Pen, I. & Shuker, D.M. (2010) Genomic conflict in scale insects: the causes and consequences of bizarre genetic systems. Biological Reviews of the Cambridge Philosophical Society, 85, 807‒828. https://doi.org/10.1111/j.1469-185X.2010.00127.x
  27. Takagi, S. (1975) Coccoidea collected by the Hokkaido University expedition to Nepal, Himalaya, 1968 (Homoptera). Insecta Matsumurana, New Series, 6, 1‒33.
  28. Takahashi, R. (1942) Some injurious insects of agricultural plants and forest trees in Thailand and Indo‐China. II. Coccidae. Report. Government Research Institute. Department of Agriculture. Formosa, 81, 1‒56.
  29. Takahashi, R. (1950) Paralecanium and Platylecanium from the Malay Peninsula (Coccidae, Homoptera). Transactions of the Kansai Entomological Society, 15, 48‒60.
  30. Takahashi, R. (1951) Some species of Coccidae from the Riouw Islands - Part II. Insecta Matsumurana, 17, 103‒112.
  31. Tang, F.T. (1991) [The Coccidae of China.] Shanxi United Universities Press, Taiyuan, P. R. China, 377 pp. [in Chinese with English summary]
  32. Williams, D.J. & Hodgson, C.J. (2014) The case for using the infraorder Coccomorpha above the superfamily Coccoidea for the scale insects (Hemiptera: Sternorrhyncha). Zootaxa, 3869 (3), 348–350. https://doi.org/10.11646/zootaxa.3869.3.9
  33. Williams, D.J. & Watson, G.W. (1990) The Scale Insects of the Tropical South Pacific Region. Pt. 3. The Soft Scales (Coccidae) and Other Families. CAB International, Wallingford, 267 pp.

How to Cite

Hodgson, C. (2025) Revision of the soft scale genus Platylecanium (Hemiptera: Coccomorpha: Coccidae), with descriptions of eight new species. Zootaxa, 5646 (2), 151–198. https://doi.org/10.11646/zootaxa.5646.2.1