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Megalurothrips usitatus
Fig. 1


Fig. 2


Fig. 3


Fig. 4


Fig. 5


Fig. 6

Sternite 7

Fig. 7

Tergites 3-4

Fig. 8

Tergites 8-9


Fig. 1: Antenna (inset: III. and IV. antennal segment)
Fig. 2: Head dorsal with ocellar triangle
Fig. 3: Pronotum
Fig. 4: Meso- and metanotum
Fig. 5: Fore- and hindwing
Fig. 6: Sternite VII
Fig. 7: Tergites III and VI
Fig. 8: Tergites VIII and IX

Taxonomic Information

Megalurothrips usitatus (Bagnall, 1913)

Taeniothrips distalis Karny, 1937
Taeniothrips longistylus Karny, 1922
Physothrips mjobergi Karny, 1920 
Physothrips cinctipennis Bagnall, 1916 
Frankliniella nigricornis Schmutz, 1913 
Frankliniella obscuricornis Schmutz, 1913 
Frankliniella vitata Schmutz, 1913 
Physothrips usitatus Bagnall, 1913

Common name:
Bean blossom thrips

Present taxonomic position:
Family: Thripidae Stephens, 1829
Thripinae (Stephens) Karny, 1921
Genus: Megalurothrips Bagnall, 1915


Species Recognition

General information about the genus Megalurothrips:
There are eight species known in this genus all of which live and breed in legume flowers. Two species are discussed within this key both have brown bodies with eight antennal segments, antennal segment III yellow, segments III and IV have constricted necks apically and forked sense cones, the pronotum contains four long setae, there are a pair of pores on the metanotum, and both have a complete comb of slender microtrichia on tergite VIII.

Typical character states of Megalurothrips usitatus:

Body color
Mainly brown

Number of antennal segments: 8
Segment IV - forked sensorium: extending to a point at least 30% distal to base of segment V
Segments II and III shape: more or less symmetric
Segments III & IV sensoria: emergent and forked
Base of sensorium on antennal segment VI: no more than 2 times as wide as base of nearest seta
Terminal antennal segments: rarely elongate

Distance between bases of ocellar setae III: greater than width of first ocellus
Head shape between compound eyes: not prolonged
Major postocular setae: less than half as long as ocellar setae III
Ocellar setae III on head: arising on anterior margin of, or in front of, ocellar triangle
Postocular setae I: present
Surface of head, pronotum and fore legs: without strong reticulate sculpture
Ocellar setae I in front of anterior ocellus:  present

Number of pairs of elongate pronotal setae: 0-3
Number of pairs of elongate posteroangular pronotal setae: 2
Pronotum shape: rectangular

Mesothoracic endofurca: with median spinula

Metanotal median area sculptured lines: transverse at anterior but scarcely sculptured postero-medially
Metanotal median setae length: longer than lateral metanotal setae
Metanotal median setae position: arising at anterior margin
Metanotum: without campaniform sensilla
Metanotum major sclerite: with two major sclerites, metascutum and metascutellum
Metanotum median area: with no equiangular reticulation
Metanotum sculpture: without dominant sculptured triangle medially
Metathoracic endofurca: transverse, sometimes with simple median spinula

Wings: present and more than half as long as abdomen
First vein of forewing: distinct from costal vein
Forewing anterior margin: with setae and cilia but cilia longer than setae
Forewing color: alternating bands of dark and light
Forewing costal fringe of cilia: arising at anterior margin of wing
Forewing costal setae at middle of wing: shorter than median width of wing
Forewing first vein setal row: incomplete, with setae not closely and uniformly spaced
Forewing posterior margin cilia: undulated near apex
Forewing second vein setal row: complete, with setae closely and uniformly spaced
Forewing surface: not reticulate
Forewings: with veins, setae and microtrichia

Fore tibial apex: not extending around fore tarsus
Mid and hind tarsi: with two segments

Abdominal pleurotergites:  not covered in microtrichia
Abdominal segment X: never tubular, longitudinally incomplete ventrally in both sexes
Abdominal sternite III of female:  without glandular areas
Abdominal sternite VII: with marginal setae but no discal setae
Abdominal sternite VII median marginal setae: arising in front of margin
Abdominal sternites IV , V and VI: with marginal setae but no discal setae
Number of lateral marginal setae on abdominal tergite II: 3
Abdominal tergites: without curved wing-retaining setae
Abdominal tergites IV & V median setal pair: much shorter than distance between their bases
Abdominal tergites V-VII: without paired ctenidia, sometimes with irregular microtrichia
Setae on abdominal tergite X: slender
Surface of lateral thirds of abdominal tergites: without regular rows of fine microtrichia
Ctenidia on tergite VIII: not present, but groups of microtrichia
Tergite VIII posteromarginal comb of microtrichia: present laterally, incomplete medially
Tergite VIII posteromarginal microtrichia: short and irregular in length



Life history:
As with other thrips species the life cycle from egg to adult is dependent on temperature. The full cycle can take about 15 days (Lewis, 1973) to over a month and adults may live for more than one month producing several generations in one year depending on seasonal weather. With greenhouse temperatures the developmental time from egg to adult can decrease to about one week.

Host plants:
Beans, flower feeding

Vector capacity:
None identified

Current known distribution:
Asia, Australia, New Zealand

Additional notes:
Megalurothrips usitatus is a pest of groundnut, mung bean and soybean. This species breeds in the flowers of these bean plant species reducing crop yields.


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