Smithsonian miscellaneous collections . lender cibarial pump, from the end of which it turns upward like thebowl of a pipe from the stem (fig. 6 B, Phy). It is the Schlundkopfof Jusbaschjanz (1910), who calls the cibarium the pharynx; it isdescribed in the larva of Odontomyia alticola by Cook (1949), andSchremmer (1951) gives a fully detailed account of its structure andprobable use in the larva of Stratiomys chamaeleon. The organ isoperated by dorsal muscles arising on the frontoclypeal area of thehead. A large anterior muscle inserted at the junction with the cibar-ium is shown by Cook to li
Smithsonian miscellaneous collections . lender cibarial pump, from the end of which it turns upward like thebowl of a pipe from the stem (fig. 6 B, Phy). It is the Schlundkopfof Jusbaschjanz (1910), who calls the cibarium the pharynx; it isdescribed in the larva of Odontomyia alticola by Cook (1949), andSchremmer (1951) gives a fully detailed account of its structure andprobable use in the larva of Stratiomys chamaeleon. The organ isoperated by dorsal muscles arising on the frontoclypeal area of thehead. A large anterior muscle inserted at the junction with the cibar-ium is shown by Cook to lie before the frontal ganglion and its brainconnectives. This muscle, therefore, is a cibarial muscle; the other,posterior muscles are true frontal pharyngeal muscles. no. 3 METAMORPHOSIS OF A FLY S HEAD—SNODGRASS The attachment of both frontal muscles and clypeal muscles on thedorsal plate of the larval sucking apparatus should identify this plateas a frontoclypeal element of the head skeleton, which is a well-defined, Clp dlcb Fig. 3.—The sucking apparatus of adult Diptera, and comparison with thecibarium of a cockroach. A, diagrammatic lengthwise section of head of a cockroach. B, diagram ofsucking apparatus of a mosquito. C, same of a mydas fly. D, labellar disc of amuscoid fly. E, cross section of sucking apparatus of adult Callitroga macellaria. F, sucking apparatus and mouth parts of adult Callitroga macellaria, lateral. G, lengthwise section of sucking apparatus of same, showing clypeal dilatormuscles of cibarium. median dorsal area of the head in most nematocerous and brachycer-ous fly larvae (fig. 6 A). Cook (1949) has called this entire area theclypeus, but in so doing he disregards the evidence from muscleattachments in insects having the clypeus separated from the frons, in 10 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 122 which the cibarial muscles arise on the clypeus and the postcibarialmuscles on the frons. The frontal and clypeal areas, however, areo
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