Valid Names Results

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

Lecanium expansum quadratum Green 1904d: 236. Type data: SRI LANKA: Balangoda on cultivated nutmeg [=Myristica fragrans] and Kalutara on undetermined tree.. Syntypes, female, Type depository: London: The Natural History Museum, England, UK; accepted valid name
Paralecanium expansum quadratum (Green, 1904); Sanders 1906: 9. change of combination
Paralecanium quadratum (Green, 1904); Takahashi 1955f: 239. change in status (level)
Discochiton quadratum (Green, 1904); Hodgson & Williams 2018: 58-60. change of combination

Families: 5 | Genera: 5

Countries: 6

Systematics: Lectotype f and paralectotype ff designated in Hodgson & Williams, 2018. Adult female D. quadratum are superficially similar to those of D. expansum but differ as follows (character-states on D. expansum in brackets): (i) anal plates almost square, anal plate length to width ratio 1:0.9 (1:0.7 for D. expansum); (ii) a complete, darker ventral marginal band present (absent); (iii) legs entirely absent (present as leg stubs); (iv) each stigmatic cleft with only 3 stigmatic spines (3–7, frequently 4+), (v) preopercular pores present associated with anterior 3 clear areas, absent from CA4 (most abundant associated with CA4 but absent from CA1 and usually CA2), and (vi) dorsal setae longer, 13–16 μm long, and more setose (normally 10–13 μm long, parallel-sided and often capitate). (Hodgson & Williams, 2018)
Structure: Slide-mounted adult female. Body almost round. Length 4.0–5.5 mm, width 3.8–5.0 mm. (Hodgson & Williams, 2018)
General Remarks: Good description and illustration of adult female by Tao et al. (1983) and by tang (1991). Redescription and illustration in Hodgson & Williams, 2018.