Text-book of comparative anatomy . FIG. 301.—Scolopendrella immaculata(after Latzel). FIG. 302.—Campodea staphylinus, withoutthe setse and hairs (after Lubbock). Diplopoda, but secondarily acquired, as in the serpents. In theDiplopoda only the 4 or 5 anterior trunk rings represent singlesegments, each subsequent ring is a double segment. Hexapoda. The body of the Hexapoda falls typically into 3 parts quite distinctfrom each other: head, thorax, and hind body (abdomen). The un-segmented head probably originally consisted of 4 segments. Thethorax is composed of 3 segments: prothorax, mesothorax,
Text-book of comparative anatomy . FIG. 301.—Scolopendrella immaculata(after Latzel). FIG. 302.—Campodea staphylinus, withoutthe setse and hairs (after Lubbock). Diplopoda, but secondarily acquired, as in the serpents. In theDiplopoda only the 4 or 5 anterior trunk rings represent singlesegments, each subsequent ring is a double segment. Hexapoda. The body of the Hexapoda falls typically into 3 parts quite distinctfrom each other: head, thorax, and hind body (abdomen). The un-segmented head probably originally consisted of 4 segments. Thethorax is composed of 3 segments: prothorax, mesothorax, andmetathorax, answering to the 3 anterior trunk segments of theMijriapoda. The typical number of segments of the hind-body is 10 or11. The thorax and the abdomen together form the trunk, whichmay be compared with the trunk of the Symphyla. Among the vi ANTENNATA—MOUTH PARTS 445 Apterygota the Thi/sunnra possess 10 abdominal segments, and theCollembola a varying number, but always less than 10. In the Pteryyotathe number of
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
