Valid Names Results

Discochiton rotundum (Green, 1904) (Coccidae: Discochiton)

Nomenclatural History

• Lecanium expansum rotundum Green 1904a: 206. Type data: INDONESIA: Java, on Rhizophora mucronata.. Syntypes, female, Type depository: London: The Natural History Museum, England, UK; accepted valid name
• Paralecanium expansum rotundum (Green, 1904); Sanders 1906: 9. change of combination
• Discochiton rotundum (Green, 1904); Hodgson & Williams 2018: 61. change of combination and rank

Common Names

Ecological Associates

Hosts:

Families: 1 | Genera: 1

Geographic Distribution

Keys

• HodgsoWi2018: pp.16-18 ( Adult (F) ) [species of Discochiton]

Remarks

• Systematics: Adult female D. rotundum are extremely similar to those of D. expansum but differ as follows (data for D. expansum in brackets): (i) preopercular pores present associated with only CA2 and CA3, rarely also CA1, but absent from CA4 (most abundant associated with CA4); (ii) complete absence of legs (present as small stubs), and (iii) only 3 stigmatic spines per cleft, each narrowing to a blunt apex, relatively short (sometimes more than 3 spines, each parallel sided and longer). Although these differences are small, it is here considered this represents a separate species, D. rotundum (Green), stat. n. The specimens from Malaysia are extremely similar to the type series but differ in (i) having far fewer spiracular disc-pores, and (ii) the presence of a few preopercular pores associated with the anteriormost clear areas on the abdomen. D. rotundum is somewhat similar to . metallicum but has narrow spiracular disc-pore bands, whereas D. metallicum has broad bands. D. rotundum is also similar to D. quadratum, but this latter species has setose dorsal setae. (Hodgson & Williams, 2018)
• Structure: “Smaller than type [P. expansum] and round in outline. Margin stippled as in metallicum.” (Green 1904, p. 206 in Hodgson & Williams)
• General Remarks: Detailed redescription and illustration in Hodgson & Williams, 2018.

Illustrations

Citations