Evolution.

  • Society for Experimental Biology (Great Britain)
Date:
1953
Catalogue details

Licence: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

Credit: Evolution. Source: Wellcome Collection.

    381/484 (page 349)
    OF THE LARGER ARTHROPODAN GROUPS 351 CRYPTOPS Relative durations of forward and back strokes. 38 mm. 7-25 : 2-75 6-54:3.46 Phase difference between successive legs. , 0-857 0-154 LITHOBIUS 25 mm. Footprints of lefs: 2 6 to 14 » a leg li- leg leg 201— leg U leg 14^ ■ b Fig. 6. Figs. 6, 7. Diagrams illustrating the essential features of the locomotory mechanism of the Scolopendromorpha, Lithobiomorpha and Scutigeromorpha. The sizes shown possess similar segment volumes and directly comparable speeds and strides, etc. The heavy lines denote legs in the propulsive backward stroke and the thin or open lines those in the recovery phase. The leg-bearing segments are numbered 1-15, etc., these numbers corresponding with trunk segments 2-16, etc., the large 8th and 9th tergites being situated on leg-bearing segments 7 and 8. In the lower diagram on Fig. 7, the substratum for the right leg is drawn at a lower level than that of the left leg because the ventral surface of the body is curved so that leg 14 arises from the body farther from the ground than does leg 9.