Senithrips Mound & Minaei

The single minute, usually wingless, species in this genus, S. psomus, is known only from Barrow Island, Western Australia (Mound & Minaei 2006). As in other small wingless thrips, many structural features are severely reduced, with resultant problems in suggesting any relationships (Figs 20, 37).

Diagnosis. Head longer than wide, without major setae; eyes reduced to 6 ommatidia in aptera and macroptera; mouth-cone short and rounded, stylets long, retracted to eyes, close together medially; antennae 6-segmented, morphological segments VI–VIII fused, III with no sensorium, IV with 2 sensoria; pronotal setae minute, notopleural sutures incomplete; basantra absent; mesopraesternum eroded into 2 lateral plates, mesoeusternum divided longitudinally; no sternopleural sutures; fore tarsal tooth absent; fore wing when present swollen at base, parallel-sided, without duplicated cilia; pelta broad but slender; tergites III–VII of macropterae each with 2 pairs of sigmoid wing retaining setae, with transverse row of more than 12 small setae; tergite IX postermaginal setae shorter than tube; tube shorter than head, anal setae much shorter than tube; male sternite VIII without pore plate.