. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. MICROORGANISMS IN THE EGG 143 As has been stated above, the germ, or sex cells in Hylohius, Sibinia, and Calandra become infected with symbionts (bacteria) at the time of blastoderm formation. This applies to all sex cells, both male and female. The symbionts degenerate in the immature testes. In the ovaries the larger mass of microorganisms become lodged in the proximal lying nurse cells of the ovarian tub
. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. MICROORGANISMS IN THE EGG 143 As has been stated above, the germ, or sex cells in Hylohius, Sibinia, and Calandra become infected with symbionts (bacteria) at the time of blastoderm formation. This applies to all sex cells, both male and female. The symbionts degenerate in the immature testes. In the ovaries the larger mass of microorganisms become lodged in the proximal lying nurse cells of the ovarian tube, although there are symbionts in the oocytes as well. The early infection of the primordial germ cells seems to be typical for all snout beetles except the Cleoninae. In many Apionidae the mycetom is represented by a clavate tubule adjacent to the four Malpighian tubes. In Protapioji two of the six siom. L.)r{ /Vf-Lyf-p Ci,_) Fig. 58.—Hylobius abietis. Passage of the mycetom {myct) between entoderm (ent) and ectoderm (eci) nearly completed forming a ring around apex of stomodaeum (stom). {From Scheinert.) ^Malpighian tubes become infected. Ceutorhynchus and Cionus possess infected cells which are derived from infected embryonic tissue and later in part unite to form an organ-like structure. In a species of Lixus the larva emerging from the egg feeds upon the infected eggshell and thereby becomes infected. Other Orders.—References to the symbionts occurring in the embryos of other insects will be found in Part II under Mallophaga and Anoplura. References Blochmann (1888, 1892), Brues and Glaser (1921), Buchner (1930), Emeis (1915), Fraenkel (1921), Glaser (1920), Glasgow (1914), Hecht (1924), Heymons (1895a), Hinman (1932), Hirschler (1912), Hovasse (1930), Klevenhusen (1927), Koch (1931), Mansour (1927, 1930,19346), Mercier (1906), Pierantoni (1927), Richter (1928), Ries (1931), Scheinert (1933), Scholzel (1937), Schrader (1923), Shinji (1919), Speyer (1929), Sulc (1910),
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