Evolution of Oviductal Gestation in Amphibians

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Fig. 13. Oviductal epithelial cycle inDermophis mexicanus. A: Nonpregnant oviduct; epithelium is thin and nonsecretory (hematoxylin and eosin stain). B: Mid-pregnant oviduct; con- nective tissue and epithelium are extended into deep folds, and the epithelium is proliferated, hyperemic, and secretory (stained with Sudan black B). C: Post-pregnant oviduct; folds are re- duced, and epithelium is much eroded and a monolayer where present (hematoxylin and eosin). Bars = 10 Fm. ct = connec- tive tissue; e = epithelium.
Fig. 14. Fetuses ofDermophis mexicanus. A: At 37 mm to- tal length, the tooth crowns and the jaw articulartion elements are mineralized (after Wake and Hanken, '82). ft = fetal teeth; o = otic capsule; or = orbital cartilage; pa = pseudarticular bone (dermal bone forming posterior lower jaw); pd = pseudo- dentary (dermal bone forming anterior lower jaw); pq = palatoquadrate (lower part ossifying; incipient quadrate ele- ment of the adult articulation). B: 75 mm TL fetuses of D. mexicanus in situ in the oviduct.
Page 1 and 2: THE JOURNAL OF EXPERIMENTAL ZOOLOGY
Page 3 and 4: 396 M.H. WAKE Haker, ’90). There
Page 5 and 6: 398 Fig. 4. Male (16.0 SVL) and fem
Page 7 and 8: 400 M.H. WAKE .. (9 months) md45mg)
Page 9 and 10: 402 M.H. WAKE Fig. 7. Salamandra at
Page 11 and 12: 404 M.H. WAKE Fig. 9. Viviparous ca
Page 13: 406 ln - ln 3 - 12 2 8 0 L m 9 5 4
Page 17 and 18: 410 M.H. WAKE A 6 Fig. 16. Fetal gi
Page 19 and 20: 412 M.H. WAKE Heinroth, 0. (1915) G

Evolution of Oviductal Gestation in Amphibians

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