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3 results for “Egg membranes”
Figure 1 in Embryo retention, character optimization, and the origin of the extra-embryonic membranes of the amniotic egg
Figure 1. Sarcopterygian phylogeny showing an optimization of embryo retention (character 1), as previously advocated by Laurin and Girondot (1999). The only modification is that all terminal taxa are in the present tree, instead of collapsing Monotremata and Theria into Mammalia, to better match the character distribution shown in Table I, and that Actinistia is coded as unknown (as shown by the absence of a data box below that taxon).
Figure 3 in Embryo retention, character optimization, and the origin of the extra-embryonic membranes of the amniotic egg
Figure 3. Sarcopterygian phylogeny showing an optimization of the developmental stage at oviposition (character 2, with ordered states). This optimization suggests that the ancestral amniote laid its eggs at the gastrula developmental stage (equivalent to absence of extended embryo retention). If the character is left unordered, the ancestral condition for amniotes is to lay eggs in the post-neurula embryonic stage (equivalent to presence of extended embryo retention).
Figure 2 in Embryo retention, character optimization, and the origin of the extra-embryonic membranes of the amniotic egg
Figure 2. Distribution of random trees (out of 10,000) versus number of steps required by the distribution of developmental characters. (a) Character 1 (presence or absence of extended embryo retention). The reference tree requires three steps (*) for this character. (b) Character 2 (developmental stage at oviposition, with ordered states). The reference tree requires nine steps (*) for this character. Note that for both characters, many random trees require no more steps than the reference tree, thus implying that there is no phylogenetic signal in these characters.
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