Valid Names Results

Trionymus okiensis Tanaka, 2018 (Pseudococcidae: Trionymus)

Nomenclatural History

• Trionymus okiensis Tanaka 2018: 31-34. Type data: JAPAN: Shimane prefecture, Oki Islands, Dougo Island, Okinoshima-cho, Kaminagu, on Miscanthus sinensis, 10/24/2014, by H. Tanaka. Holotype, female, Type depository: Tsukuba: National Museum of Nature and Science, Japan; accepted valid name Notes: One paratype of the new species described here is deposited in the National Museum of Nature and Science, Tsukuba, Japan (NSMT), and two paratypes are deposited in the Ehime University Museum, Matsuyama, Japan (EUMJ). Illustr.

Common Names

Ecological Associates

Hosts:

Families: 1 | Genera: 1

Geographic Distribution

Keys

• Tanaka2018: pp.34 ( Adult (F) ) [Japanese Trionymus]

Remarks

• Systematics: Some species of the genus Trionymus are very close to several species belonging to Dysmicoccus Ferris, 1950 and the current definitions of these genera are probably arbitrary (Williams, 2004). Most researchers follow McKenzie (1967), who placed species with 6 or more pairs of cerarii in Dysmicoccus, and species with 5 or fewer pairs of cerarii in Trionymus. However, on this basis it was difficult for Tanaka to determine the generic position of T. okiensis because it has 4–6 cerarii. Therefore, T. okiensis was placed tentatively in Trionymus based on its morphological similarity to T. frontalis. T. okiensis is quite similar to T. frontalis McKenzie, 1967 so far only known from California, USA in having a pair of frontal cerarii, oral-collar tubular ducts of two different sizes on the dorsal surface, and a circulus divided by an intersegmental line. However, the new species is distinguishable from T. frontalis by the following characters (characters of T. frontalis are given in parentheses): cerarii numbering 4–6 pairs (3 pairs); relatively deep oral-collar tubular ducts on dorsum present in two distinctly different sizes (different types of dorsal ducts are difficult to distinguish from each other, and the ducts are so shallow that outer ductules can be hardly seen in slide-mounted specimens); legs short, with hind trochanter + femur 300–330 μm long (legs relatively long, with hind trochanter + femur 420–458 μm long). Trionymus okiensis is also similar to Dysmicoccus boninsis (Kuwana, 1909), the pantropical pest of sugarcane (Saccharum offi cinarum L.), in having a pair of frontal cerarii and oral-collar tubular ducts of two different sizes on the dorsal surface. However, it differs from D. boninsis in the following characters (characters of D. boninsis are given in parentheses): more than 10 auxiliary setae on each anal lobe cerarius (fewer than 10); multilocular pores on the dorsum (without dorsal multilocular pores); circulus divided by an intersegmental line (circulus not divided); and narrow and parallel-sided body with the ratio of its maximum length to maximum width 2.5–2.7 (body usually relatively broad, with ratio of maximum body length to maximum body width 1.7–2.0). (Tanaka, 2018)
• General Remarks: Detailed description and illustration in Tanaka, 2018.

Illustrations

Citations