Diagnosis Female macropterous; body color dark brown, with distal abdominal segments except tube darker; legs brown with apexes of femora paler; antennomere I light brown, II pale with extreme base light brown, III dark brown with lighter base, IV–VIII almost black; fore wings brown, darker on base and apex. Antennae 7-segmented, VII–VIII almost completely fused but with a visible suture between both; antennomere III with 2 and IV with 4 sense cones. Head as long as wide, without elongated setae on cheeks; maxillary stylets wide apart, forming a “V” shape. Prosternum with basantra. Metanotum weakly sculptured, with one pair of long median setae wide apart. Metathoracic sternopleural sutures present. Pelta reticulate, with the posterior margin potentially eroded; abdominal tergites II–VII with 1 pair of wing-retaining setae; tube cone-shaped, a wide base strongly tapering to the apex, covered in tubercles with short setae, about 1.4x as long as basal width. Median abdominal sternites are usually longer than tergites. Fore tarsi with a robust tooth. Fore wings without duplicated cilia.
Male micropterous. Similar in appearance to female, with thick fore legs and a large tarsal tooth. Abdominal pore plates absent.
Intraspecific variation Unknown.
Genus and similar species information Acallurothrips is a genus with over 20 species worldwide, of which three are recorded in Brazil. These thrips have a characteristic tube: short, with a thick base and strongly tapering to the apex, sometimes with short setae laterally. The head is about as wide as long, with maxillary stylets at least one third of head width apart; antennomeres VII and VIII are partially or completely fused; and abdominal sternites are usually longer than the tergite in the same segment. Acallurothrips fasciolatus is distinguished from A. conifer by its dark brown tube, instead of orange-ish; and from A. quadraticeps by its smaller size and tube relatively longer, about 1.4x as long as basal width (1.1x or less in A. quadraticeps). A key to Neotropical species of Acallurothrips is available in Mound & Marullo (1996).
Distribution around the world Described from Brazil.
