Campichoetidae, Griffiths, 1972

McAlpine, David, 2011, Observations on Antennal Morphology in Diptera, with Particular Reference to the Articular Surfaces between Segments 2 and 3 in the Cyclorrhapha, Records of the Australian Museum 63 (2), pp. 113-166 : 140

The Campichoetidae and Diastatidae

The antennae of Campichoeta punctum (Meigen) and Diastata fuscula (Fallén) have been studied.

In Campichoeta the distal articular surface of segment 2 ( Fig. 74 ) is extensively concave, more deeply so on its lateral part, but there is no defined cup. The conus is located towards the medial side of this surface and is very asymmetrical. While the medial part of the conus is quite prominent, the part lateral to the foraminal ring is obsolete, so that the foramen and foraminal ring face laterally. The foraminal ring is crenulate laterally, but this condition is probably not homologous with the caestus of Neurochaetidae etc. The button is located on the articular surface a little laterally to the foraminal ring. Segment 3 ( Fig. 75 ) has not a typical basal stem, but is more prominent dorsobasally than ventrobasally. The basal hollow is moderately large; the basal foramen is situated just beyond its medial margin and faces laterally. The sacculus is located slightly before mid length and has the usual lateral pore. The arista is three-segmented, with short annular segment 4 and long cylindrical segment 5.

The antenna of Diastata ( Fig. 73 ) agrees in all essential details with that of Campichoeta as given above, the main differences being in proportions.

Figures

Figures 73–75. Antennae of Diastatidae and Campichoetidae. (73) Left antennal seg. 2 of Diastata fuscula (Fallén) (fam. Diastatidae), lateral view, seg. 3 removed. (74) Campichoeta punctum (Meigen) (fam. Campichoetidae), lateral view of seg. 2, seg. 3 removed. (75) The same, medial view of seg. 3. bf, basal foramen; bh, basal hollow; bu, pedicellar button; sc, sacculus.