These are large day-flying or night-flying moths, usually tailed and similar to Uraniidae in general appearance(except for the generaApoprogones, Anuropteryx and Lonchotura) . The position of this family is not certain amongst the Macrolepidoptera but it is usually considered to belong to the superfamilyGeometroidea, whilst the identity of its closest extant relative is under investigation using DNA sequencing. Until recently very little has been known of sematurid biology (but see Sematurinae). The "chaetosemata" of Sematuridae have long setae overhanging the compound eyes, the antennae are thickened towards the often rather clubbed or hooked tip whilst a tympanal organ for hearing is always absent and there are other diagnostic characters in the abdomen (Minet and Scoble, 1999: 305-307; Holloway et al., 2001).
Holloway, J.D., Kibby, G and Peggie, D. (1997). The families of Malesian moths and butterflies. Fauna Malesia Handbooks. 455 pp. Brill Academic Publishers, Leiden.
Minet, J. and Scoble, M. J. (1999) . The Drepanoid/Geometroid Assemblage. Pp. 301–320 in Kristensen, N.P. (Ed.), Lepidoptera, Moths and Butterflies. Volume 1, Evolution, Systematics, and Biogeography. Handbook of Zoology, vol. IV, Arthropoda: Insecta, Part 35: 491 pp. Walter de Gruyter, Berlin and New York.