. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. CLASSIFICATION OF INSECTS 801 Sur un representant d'un nouveau ordre des hemiodonates de Permien de l'Oural. Moskov. Obshch. Isp. Prirody. Otd. Biol. B., 51, pp. 63-70 (1946). ORDER COLLEMBOLA The only extinct family known is Protentomobryidae (Fig. 1157) from Canadian amber of uncertain age (Cretaceous or early Tertiary). The family is characterized by having a furcula which is not differen- tiated into manubrium, dentes and mucrones. Fragments of minute. 1157 1158 Figs. 1157-1158. Collembola and Thysanura 1157. Prot
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. CLASSIFICATION OF INSECTS 801 Sur un representant d'un nouveau ordre des hemiodonates de Permien de l'Oural. Moskov. Obshch. Isp. Prirody. Otd. Biol. B., 51, pp. 63-70 (1946). ORDER COLLEMBOLA The only extinct family known is Protentomobryidae (Fig. 1157) from Canadian amber of uncertain age (Cretaceous or early Tertiary). The family is characterized by having a furcula which is not differen- tiated into manubrium, dentes and mucrones. Fragments of minute. 1157 1158 Figs. 1157-1158. Collembola and Thysanura 1157. Protentomobrya (Folsom) Protentomobryidae (Collembola). 1158. Triassomachilis (Sharov) Triassomachilidae (Thysanura). arthropods (Rhyniella), from Devonian deposits of Scotland, have been referred to the Collembola, but their systematic position is problematical. ORDER ENTOTROPHI No extinct families are known. Representatives of all three living families have been described from late Tertiary deposits of Arizona. ORDER THYSANURA The only extinct family is the Triassomachilidae (Fig. 1158), from the Triassic beds of Russia. The other fossil representatives of the order, belonging to the Lepismatidae and Machilidae, occur in the Baltic amber. LITERATURE ON COLLEMBOLA, ENTOTROPHI and THYSANURA — EXTINCT FAMILIES Folsom, J. W. Collembola. In Insects and Arachnida from Canadian Amber. Univ. Toronto Stud., Geol. Ser. No. 40, pp. 14-17 (1937).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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