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Fig. 1. Oligonychus orthius adult female non-type (The Philippines) - detail of claws I, III, IV.

Fig. 2. Oligonychus orthius adult female non-type (The Philippines) - detail of pattern of pregenital striae.

Fig. 3. Oligonychus orthius adult female non-type (The Philippines) - detail of pattern of striae on prodorsum.

Fig. 4. Oligonychus orthius adult female non-type (The Philippines) - detail of pattern of dorsal stiae between setal pairs d1, e1, f1.

Fig. 5. Oligonychus orthius adult female non-type (The Philippines) - detail of pattern of dorsal stiae between setal pairs e1, f1, f2.

Fig. 6. Oligonychus orthius adult female non-type (The Philippines) - detail of peritreme.

Fig. 7. Oligonychus orthius adult female non-type (The Philippines) - detail of peritreme.

Fig. 8. Oligonychus orthius adult male holotype - detail of claw I (arrows indicate the tips of the claws; compare with line drawing Fig. 14).

Fig. 9. Oligonychus orthius adult male prodorsum, lateral habitus - a. holotype; b. non-type (The Philippines).

Fig. 10. Oligonychus orthius adult male holotype - detail of aedeagus.

Fig. 11.  Oligonychus orthius adult male holotype - detail of aedeagus, with outline of aedeagus shape (interpretation 1).

Fig. 12.  Oligonychus orthius adult male holotype - detail of aedeagus, with outline of aedeagus shape (interpretation 2).

Fig. 13.  Oligonychus orthius adult male holotype - detail of aedeagus, with outline of aedeagus shape (interpretation 3).  This is the shape presented in the original description by Rimando (1962).

Fig. 14. Oligonychus orthius adult male and female (non-type, The Philippines) - detail of aedeagus (at different focal points) and claws I and IV; detail of female claws I and IV.

Fig. 15. Oligonychus orthius adult male non-type (The Philippines) - detail of aedeagus.

Material examined

type; non-types

Taxonomy

Subfamily Tetranychinae

Tribe Tetranychini

Common Name

none

Distribution

^^NOT PRESENT IN AUSTRALIA

China, Japan, Korea, *The Philippines, Taiwan, Thailand

Taxonomy Changes

none

Diagnosis

Female

• empodia I-IV = sickle-shaped, curved claw, about as long as proximoventral hairs (three pairs) (Figs 1, 14)
•  pregenital striae longitudinal (Fig. 2)
• prodorsal striae longitudinal, forming broad U-shape (Fig. 3)
• dorsal striae mostly transverse, except longitudinal between setae f1 and f2, and wavy between f2-f2 (Figs 4-5)
• peritreme ending in slightly expanded bulb (Figs 6-7)
• tarsus I with the sockets of four tactile setae proximal to, and one solenidion proximal/overlapping, the socket of the proximal duplex seta (i.e. the solenidion is just proximal or just overlapping)
• tarsus II with the sockets of four tactile setae and one solenidion proximal to the socket of the duplex seta (or the sockets of three tactile setae and one solenidion proximal to, and one tactile seta overlapping, the socket of the duplex seta - i.e. one tactile seta is just proximal or overlapping)
• leg chaetotaxy:
  • femora 10, 6, 4, 4
  • genua 5, 5, 4, 4
  • tibiae 10(1), 7, 6, 7
  • tarsi 18(3+3), 16(2+3), 10(1+0), 10(1+0)

Male

• empodium I with short dorsal and ventral claws of similar length (Figs 8, )
• empodia II-IV similar to those of female (Figs 1, 14)
• prodorsum with longitudinal striae, forming a U-shaped posteriorly (Fig. 9)
• tarsus I with the sockets of four tactile setae and two solenidia proximal to, and one solenidion overlapping with, the socket of the proximal duplex seta
• tarsus II with the sockets of three tactile setae and one solenidion proximal to, and one tactile seta overlapping with, the socket of the duplex seta
• leg chaetotaxy:
  • femora 10, 6, 4, 4
  • genua 5, 5, 4, 4
  • tibiae 13(4), 7, 6, 7
  • tarsi 20(5+3), 16(2+3), 10(1+0), 10(1+0)
• the shape of the tip of the aedeagus changes with the focal point (Figs 11-13 represent three different focal points).  The shape presented by Rimando (192) in the original description is presented in Figure 13.  However, the shape is interpreted differently here - see below.
  • aedeagus dorsally directed, sinuous finger with blunt tip; no anterior projection; posterior projection is a sinuous finger of almost even width (slightly tapering distally), with blunt tip directed posteriorly; dorsal margin of shaft at 15° angle to ventral margin, with strong right-angle to acute bend forming the dorsal projection; ventral margin of shaft more or less straight (Figs 10-15) 

Hosts

**Imperata cylindrica (Poaceae), Musa spp. (Musaceae), Pandanus odoratissimus (Pandanaceae), *Saccharum officinarum, Sorghum bicolor, Zea mays (Poaceae)

* - holotype and paratypes; ** - paratypes

Similar Taxa

Oligonychus oryzae (Hirst, 1926)

References

Migeon, A. and Dorkeld, F. (2006-2017) Spider Mites Web: a comprehensive database for the Tetranychidae. http://www.montpellier.inra.fr/CBGP/spmweb

*Rimando, L.C. (1962b)  The tetranychoid mites of The Philippines.  University of The Philippines College of Agriculture Technical Bulletin 11: 1-52 

Notes

^^ of concern to Australia; on economic hosts in southeast Asia