. Bulletin of the British Museum (Natural History) Entomology. 222 L. LYNEBORG of the present material in 1958. The author has examined a number of Oriental species of the Psilocephala-group, but was unable to place any of them in Steno- pomyia. However, dissections of the male terminalia were not made. At present the author considers that Stenopomyia represents a monophyletic group. There are several characters which may be regarded as plesiomorphic; for example the rounded head with only slightly diverging facial margins resulting in facial indices between 0-32 and 0-47, the bare face, the p
. Bulletin of the British Museum (Natural History) Entomology. 222 L. LYNEBORG of the present material in 1958. The author has examined a number of Oriental species of the Psilocephala-group, but was unable to place any of them in Steno- pomyia. However, dissections of the male terminalia were not made. At present the author considers that Stenopomyia represents a monophyletic group. There are several characters which may be regarded as plesiomorphic; for example the rounded head with only slightly diverging facial margins resulting in facial indices between 0-32 and 0-47, the bare face, the presence of hairs only on the lateral parts of prosternum, the entirely bare sternopleuron, the bare posterior surface of cxx and cx2, the comparatively long and slender cell Rit and the open cell M3. As synapomorphic for the genus may be listed the entirely bare male frons, the strong modifications of the epandrium (especially its posterior margin), and the usually very slender and elongate aedeagus. The two large and more advanced Ethiopian Therevid genera, Irwiniella and Thereva, have the prosternum haired all over, an entirely haired sternopleuron, presence of hairs on posterior surface of cx1 and cx2, dorsocentral setae usually present, and cell Ri comparatively shorter and broader. The male frons of Irwiniella and Thereva may be bare, but is usually haired, the epandrium is usually simple or only slightly modified, and the aedeagus is basically broader and shorter. The small genus Stenosathe represents a transition between Stenopomyia and Irwiniella; see further on p. 247. The relationship between Stenopomyia and Schoiitedenomyia is less clear. Schou- tedenomyia possesses many of the plesiomorphic characters mentioned above for Stenopomyia, while others are present in a more apomorphic state in Schoiitedenomyia, such as the shortened antennal style, the usually petiolate cell Ms, and the partial reduction of the setae on tv Schoiitedenomyia has further apomorphies in the m
Size: 2746px × 910px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbritishmuseumnaturalhistory, bookcentury1900, bookcoll
