Summary
The segmental organisation of the tail region in the embryo of Drosophila melanogaster, which is defined here as the epidermal region posterior to the boundary between abdominal segments A7 and A8, has been investigated by means of ultraviolet (UV) laser fate-mapping and phenotypic analysis of embryonic mutants that alter the segmental pattern of the larval cuticle. Wild-type embryos were irradiated in the presumptive tail region with a UV- laser microbeam of 20 μm diameter at the blastoderm stage. The ensuing defects were scored in the cuticle pattern of the tail region of the first-instar larva, which is described in detail in this paper. The spatial distribution of defect frequencies was used to construct a blastoderm fate-map of the cuticle structures of the larval tail region. The segmental origin of the larval tail structures was inferred from the phenotypic analysis of segmentation and homoeotic mutants, which revealed pattern repetition throughout the embryonic tail region corresponding to four segment anlagen, A8 to A11, and a non-segmental telson. These data enabled the transformation of the blastoderm fate-map of cuticle structures into a map of tail segment anlagen. The tail anlage occupies about 10% of the egg length (EL), bounded by segment A7 anteriorly at 20% EL and by the proctodaeum posteriorly at 10% EL, as measured from the posterior pole. The anlagen of segments A8 and A9 appear to be narrow dorso-ventral strips of blastoderm cells similar to the anlagen of the trunk segments, whereas the anlagen of A10 and A11 are smaller and produce fewer pattern elements. The telson is represented in the cuticle by the tuft which derives from a very dorsal posterior position. The antero-posterior axis of the entire tail anlage appears curved upward posteriorly. Differences in the mode of development between tail and trunk segments are discussed, as are similarities of larval and imaginal tail development in Drosophila. Comparison with tail development in other insects suggests that, during evolution, the transition from semi-long-germ to long-germ development modified the organisation of the tail region without affecting its primary subdivision into metameric units.
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Jürgens, G. Segmental organisation of the tail region in the embryo of Drosophila melanogaster . Roux's Arch Dev Biol 196, 141–157 (1987). https://doi.org/10.1007/BF00376308
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DOI: https://doi.org/10.1007/BF00376308