The Biology of Twins (Mammals)
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novemcinctus the number is almost uniformly four, in D. hybridus the number is 68 TWINNING IN OTHER SPECIES OF ARMADILLO 69 larger though much less definitely fixed. There is a strong tendency, however, for the species to settle down upon the number eight, though litters of nine are fre- quent and from seven to twelve are reported.
Fig. 23 Figs. 23 and 24. — Diagrammatic views of two stages in the develop- mant of Dasypus hybridus (the Mulita armadillo). For comparison with equivalent stages of... D, novemcincius (Figs. 12 and 14) they should be viewed inverted. Note Trager cavity {trcav), trophoderm plate {tr pi), ectoderm (ec), endoderm {en), mesoderm {ms), diplotrophoblast {dtr), extra-embryonic cavity {ex c), uterine mucosa (mucut), common amnion (c am), primitive streak of embryos. (pr st), amniotic connecting canal {en am). (From Fernandez.) The fact that there is so much variabiUty in the number of polyembryonic offspring in this species apparently indicates that the condition is of com- paratively recent origin.
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You can find similar books in the "Read Also" column, or choose other free books by Newman, Horatio Hackett, B. 1875 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
novemcinctus the number is almost uniformly four, in D. hybridus the number is 68 TWINNING IN OTHER SPECIES OF ARMADILLO 69 larger though much less definitely fixed. There is a strong tendency, however, for the species to settle down upon the number eight, though litters of nine are fre- quent and from seven to twelve are reported.
Fig. 23 Figs. 23 and 24. — Diagrammatic views of two stages in the develop- mant of Dasypus hybridus (the Mulita armadillo). For comparison with equivalent stages of... D, novemcincius (Figs. 12 and 14) they should be viewed inverted. Note Trager cavity {trcav), trophoderm plate {tr pi), ectoderm (ec), endoderm {en), mesoderm {ms), diplotrophoblast {dtr), extra-embryonic cavity {ex c), uterine mucosa (mucut), common amnion (c am), primitive streak of embryos. (pr st), amniotic connecting canal {en am). (From Fernandez.) The fact that there is so much variabiUty in the number of polyembryonic offspring in this species apparently indicates that the condition is of com- paratively recent origin.
What to read after The Biology of Twins (Mammals)?
You can find similar books in the "Read Also" column, or choose other free books by Newman, Horatio Hackett, B. 1875 to read onlineMoreLess
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