Zöology; a textbook for colleges and universities . FIG. 76. A wolf spider. PHYLUM ARTHROPODA 263 the insects; but the insects also have simple eyes(ocelli). Class Prototracheata The arthropods, with their jointed legs and usuallyhard chitinous covering, seem isolated in the animalkingdom. The various soft-bodied and legless mem-bers of the group, such as the female scale insect, areobviously not primitive, but highly specialized. Look-ing for some real relative outside of the arthropodphylum, we can turn only to the higher worms. Theseare adapted for life in the water or in moist earth,wherea
Zöology; a textbook for colleges and universities . FIG. 76. A wolf spider. PHYLUM ARTHROPODA 263 the insects; but the insects also have simple eyes(ocelli). Class Prototracheata The arthropods, with their jointed legs and usuallyhard chitinous covering, seem isolated in the animalkingdom. The various soft-bodied and legless mem-bers of the group, such as the female scale insect, areobviously not primitive, but highly specialized. Look-ing for some real relative outside of the arthropodphylum, we can turn only to the higher worms. Theseare adapted for life in the water or in moist earth,whereas the majority of the arthropods live on the sur-face of the earth or on plants. The Crustacea do indeedinhabit the waters in great numbers, but they showlittle resemblance to worms. There is, however, onegroup of animals which, although terrestrial, is soft-bodied, without chitinous body rings, and doubtlessprimitively so. Superficially, at least, it seems to com-bine the features of a worm with those of a Peripatus, first discovere
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
