Archive image from page 54 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9885 Year: 1890 ( THE HEAD AND MOUTH ARMATURE. 41 its cuticular lining without morphological significance. In my former work I drew attention to the marked resemblance of these hooks to certain hook-like sclerites in front of the suctorial disc of the proboscis of t
Archive image from page 54 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9885 Year: 1890 ( THE HEAD AND MOUTH ARMATURE. 41 its cuticular lining without morphological significance. In my former work I drew attention to the marked resemblance of these hooks to certain hook-like sclerites in front of the suctorial disc of the proboscis of the imago ; I did not then know how closely this portion of the proboscis is connected with the great hooks of the larva in its developmental history. These have only a secondary connection by articulation with the internal pharyngeal skeleton (Fig. g, ?) which supports them. They are used as organs of locomotion, and probably assist in the disintegration of the flesh in which the larva burrows. Before entering upon any further description of the head of the larva, I shall explain the relation of its parts from a de- FlG. 7'—A vertical longiludinal median section tlirough the anterior portion of a newly-hatched larva seen with \ inch objective. The external portions of the head are added to the actual section—in, invagination of the forehead ; //, lateral (great) hooks; iii, median tooth {labruiit); /it, stomal disc ; sii, salivary <luct; a', oesojihagus ; aj, antennal disc ; oil, optic disc ; ct, cephalic ganglia. velopmental point of view. The retrogressive character of the final stages of development in the egg has already been alluded to (p. 2). A median section of the newly-hatched larva is given in Fig. 7. A strong median tooth m, is seen deeply imbedded between the maxillae. This tooth is described by Weismann as the most important part of the mouth armature ; it is not present after the first moult—and he regarded it as consisting of the united mandibles of t
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