Thrips parvispinus

Recognition data

Distinguishing features

Both sexes fully winged; body brown, head and thorax paler than abdomen, head commonly with cheeks darker than median area; legs mainly yellow; antennal segment III yellow, also basal half of IV & V; forewings brown with base sharply pale. Antennae 7-segmented, III - IV with sensorium forked. Head wider than long, ocellar setae pair III small and arising on anterior margins of ocellar triangle; postocular setae pairs I & III slightly longer than ocellar setae III, postocular pair II minute. Pronotum with 2 pairs of long posteroangular setae; posterior margin with 3 pairs of setae. Metanotum reticulate medially, reticles varying in shape and sometimes with faint internal sculptured markings; median setae long, arising behind anterior margin; campaniform sensilla absent. Forewing first and second veins with complete rows of setae; clavus with 5 marginal setae. Tergite II with 3 lateral marginal setae; tergite VIII posterior margin with comb almost absent; pleurotergites without discal setae. Sternites II & VII without discal setae, III � VI with about 6 to 12 discal setae in an irregular row. Male yellow; tergite VIII with no posteromarginal comb; sternites III � VII each with small transverse glandular area, discal setae arising laterally.

Related and similar species

T. parvispinus has not been found in California. It is included here because it is a potential invader of mainland USA since it is abundant on Hawaii. It is one of a small group of Asian Thrips species, including Thrips orientalis , in which discal setae are present on abdominal sternites III to VI but not on sternite VII. Thrips is the second largest genus in the Thysanoptera, and currently includes, worldwide, about 280 species. All members of the genus lack ocellar setae I on the head, and they all have ctenidia on tergite VIII posteromesad to the spiracles. Other characters, such as number of antennal segments, number of setae on the forewing veins, and number of discal setae on the sternites are variable between species (Palmer, 1992; Mound & Masumoto, 2005).

Taxonomic data

Current valid name

Thrips parvispinus (Karny)

Original name and synonyms

Isoneurothrips parvispinus Karny, 1922: 106
Isoneurothrips jenseni Karny, 1925: 7
Isoneurothrips pallipes Moulton, 1928: 296
Thrips (Isoneurothrips) taiwanus Takahashi, 1936: 440

Family placement

Thripidae, Thripinae

Biological data

Life history

Feeding and breeding in flowers and on young leaves

Host plants

Highly polyphagous

Tospoviruses vectored

None

Crop damage

Serious damage to plantations of pawpaw (Carica papaya) in Hawaii, damage to various food crops in S.E. Asia, also to greenhouse Gardenia plants in Greece (Mound & Collins, 2000).