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| Nayrolles, Pierre. |
| Phylogenetic studies on several groups of arthropods, such as Acari (mites) or Collembola (springtails), make wide use of chaetotaxy. Chaetotaxic characters, besides being morphological features (setal shape), often have a binary nature, that is presence vs. absence. A seta can be variable in a population, and one may attribute a presence probability to this seta. In fact, the presence probability should be defined for each instar. One might think that a variable seta corresponds to a polymorphism (e.g., two or more alleles in a population); in fact, setal variability should be regarded as the result of a propensity intrinsic to individuals, i.e., a potentiality being expressed at random among specimens. The phenomenon known as lateral inhibition explains... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Ontogeny; Phytogeny; Chaetotaxy; Probabilistic organs; Ontogenetic trajectories; Arthropods; Collembola; Symphypleona. |
| Ano: 1998 |
URL: http://www.repository.naturalis.nl/record/534360 |
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| Cvijanović, M.; Ivanović, A.; Kolarov, N.T.; Džukić, G.; Kalezić, M.L.. |
| When the phenotypic divergence within a monophyletic group is characterised by parallel variation of different phenotypic traits, it is very likely that the environment through constraints and/or selection has affected the developmental pathways simultaneously. Such patterns of phenotypic divergence characterise the phenotypic evolution of the crested newts (Triturus cristatus superspecies). In this study, we have examined interspecific variations in the embryonic development of four crested newt species. The species are similar with respect to some basic developmental traits, some morphologically defined developmental stages and the survival rate during early embryogenesis. However, there is significant variation in the developmental rate, as well as... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Developmental correlations; Developmental sequences; Life-history; Ontogenetic trajectories; 42.82. |
| Ano: 2009 |
URL: http://www.repository.naturalis.nl/record/311149 |
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