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Aptinothrips stylifer
Fig. 1


Fig. 2


Fig. 3


Fig. 4


Fig. 5


Fig. 6

Sternites 5-6

Fig. 7

Tergites 4-5

Fig. 8



Fig. 1: Antenna
Fig. 2: Head dorsal
Fig. 3: Pronotum
Fig. 4: Meso- and metanotum
Fig. 5: Metasternum and 1st and 2nd abdominal sternite
Fig. 6: Sternites V and VI
Fig. 7: Tergites IV and V
Fig. 8: Tergites VIII-X

Taxonomic Information

Aptinothrips stylifer Trybom, 1894

Aptinothrips rufous f. stylifer Priesner, 1922
Aptinothrips stylifer
Trybom, 1894

Common name:
Grass thrips

Present taxonomic position:
Family: Thripidae Stephens, 1829
Subfamily: Thripinae (Stephens) Karny, 1921
Genus: Aptinothrips Haliday, 1836


Species Recognition

General information about the genus Aptinothrips:
There are only five species in this genus and all are wingless, they do not have ocelli, and they have 6 or 8 segmented antennae with simple sense cones on segments III and IV. All of the Aptinothrips species are found living in grasses.

Typical character states of Aptinothrips stylifer:

Body color
Mainly pale or yellow, with some darker markings

Number of antennal segments: 8
Segments II and III shape: more or less symmetric
Segments III & IV sensoria: emergent and simple
Base of sensorium on antennal segment VI: no more than 2 times as wide as base of nearest seta
Terminal antennal segments: rarely elongate

Head shape between compound eyes: not prolonged
Major postocular setae: less than half as long as ocellar setae III - more than half as long as ocellar setae III
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: 0
Pronotum shape: rectangular

Mesothoracic endofurca: with median spinula

Metanotum: without campaniform sensilla
Metanotum major sclerite: with only one major sclerite, this is at least twice as wide as long
Metanotum median area: with at least some equiangular reticulation
Metanotum sculpture: without dominant sculptured triangle medially
Metathoracic endofurca: transverse, sometimes with simple median spinula

Wings: absent

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 discal setae present on median area
Abdominal sternite VII median marginal setae: arising in front of margin
Abdominal sternites IV , V and VI: with discal setae present medially as well as marginal setae
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
Number of discal setae on sternite V: 10-20 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: absent



Life history:
As with other thrips species the life cycle from egg to adult is dependent on temperature. The full cycle can take less than one week to over a month and adults may live for more than one month producing several generations in one year depending on seasonal weather.

Host plants:
Grasses, Poaceae, prefers Dechampsia sp. and Dactylis sp. (Mound et al. 1976, Mound and Walker, 1982).

Vector capacity:
None identified

Current known distribution:
In temperate climates throughout the world.

Additional notes:
Aptinothrips stylifer is not encountered as often as A. rufus. All life forms are found living in grasses in temperate regions. The two species included in this key have also been found in bird nests. Since they are wingless it is believed that they traveled to the nests by hitchhiking on the birds.


Moritz G, Morris DC, Mound LA (2001): ThripsID - Pest thrips of the world. ACIAR and CSIRO Publishing Collingwood, Victoria, Australia, CDROM ISBN 1 86320 296 X.
Moritz G, Mound LA, Morris DC, Goldarazena A
(2004): Pest thrips of the world - an identification and information system using molecular and microscopial methods. CBIT, University of Queensland,CDROM ISBN 1-86499-781-8.
Mound, LA & Marullo, R (1996): The thrips of Central and South America: An Introduction (Insecta: Thysanoptera). Associated Publishers, Gainesville.
Mound, LA & Walker AK (1982): Terebrantia (Insecta: Thysanoptera). Fauna of New Zealand (Number 1). Science Information Division, DSIR Wellington, New Zealand.
Mound, LA, Morison, GD, Pitkin, BR & Palmer, JM (1976): Thysanoptera- Handbooks for the identification of British Insects. - Royal Entomol. Soc. 1 (11): 1-79.
Palmer, JM (1975): The grass-living genus Aptinothrips Haliday (Thysanoptera: Thripidae). Journal of Entomology (B) 44: 175-188.
Stannard, LJ (1968): The thrips, or Thysanoptera, of Illinois. Illinois Natural History Survey Bulletin 29: 215-552.

Mound, LA (2005): Thysanoptera (Thrips) of the World - A Checklist. http://www.ento.csiro.au/thysanoptera/worldthrips.html