Archive image from page 184 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 THORACJC EXO-SKELETON. 159 If we compare the thoracic leg of an insect with that of a crayfish, we recognise in the five joints of the insect's tarsus the representatives of the five joints of the crustacean Hmb known as the basipodite, ischio
Archive image from page 184 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 THORACJC EXO-SKELETON. 159 If we compare the thoracic leg of an insect with that of a crayfish, we recognise in the five joints of the insect's tarsus the representatives of the five joints of the crustacean Hmb known as the basipodite, ischiopodite, meropodite, carpopodite, and propodite, whilst the claw-like dactylopodite is represented in insects by two tarsal claws. In the crustacean the basal coxopodite corresponds with the coxa of the insect, whilst the exopodite of the generalised Crustacea corresponds with the fenioro-tibial portion of the limb in the insect. The bladder-like femoro-tibial rudiment closely resembles Fig. 34.—Kive stages in the development of the leg in the nymph, showing the manner in which the femoio-tibal joints are formed from the exopodite. /, The rudiment of a limb in the second stage of development. , The same in the third stage. 7, 4, and , Three successive stages of the same : e, coxopodite ; ex, exopodite ; eit, endopodite ; s, sternum ; c', coxa ; /, femur ; /, tibia ; / to 5, tarsal joints. the exopodite of some Crustacea, and the rudimentary limb of the fly-nymph takes us back to the primary bifurcate condition still retained in the thoracic limbs of the generalised Crustacea. This much is certain, the five tarsal joints in the Blow-fly are all differentiated distinctly before any trace of the segmen- tation of the femoro-tibial portion of the limb is apparent, and this is developed from a process which closely resembles the exopodite of the crustacean limb. The Dorsal Appendages of the thorax, or wings, are highly
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