From Haeckel to event-pairing: the evolution of developmental sequences

Bininda‐Emonds, Olaf R. P.; Jeffery, Jonathan E.; Coates, Michael I.; Richardson, Michael K.

doi:10.1007/s12064-002-0016-5

Cited by 56 publications

(66 citation statements)

References 51 publications

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“…Other researchers have focused mainly on the phylogenetic correlates of variation in dental developmental sequences (for strepsirrhines, see especially Schwartz [1974Schwartz [ , 1975). Still others, including proponents of 'sequence heterochrony' [Mabee and Trendler, 1996;Velhagen, 1997;Smith, 2001Smith, , 2002Bininda-Emonds et al, 2002;Bloch et al, 2002;Jeffery et al, 2002a, b], analyze both the phylogenetic as well as potential ecological and life history correlates of developmental patterns and sequences. In fact, we would maintain that one cannot fully understand the variation in dental developmental sequences and rates among lemurs without taking all of these factors into consideration.…”

Section: Discussionmentioning

confidence: 99%

Schultz’s Unruly Rule: Dental Developmental Sequences and Schedules in Small-Bodied, Folivorous Lemurs

Godfrey¹,

Samonds²,

Wright³

et al. 2005

IJFP

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Schultz’s rule (as reconstructed by Smith) states that there is a relationship between the pattern (or relative order) of eruption of molar versus secondary (replacement) teeth and the overall pace (or absolute timing) of growth and maturation. Species with ‘fast’ life histories (rapid dental development, rapid growth, early sexual maturation, short life spans) are said to exhibit relatively early eruption of the molars and late eruption of the secondary replacement teeth (premolars, canines, incisors), whereas species with ‘slow’ life histories are said to exhibit relatively late eruption of the molars and early eruption of the secondary dentition. In a recent review, B.H. Smith noted that primates with tooth combs might violate this rule because tooth combs tend to erupt early, regardless of the pace of life history. We show that exceptions to Schultz’s rule among lemurs are not limited to the relative timing of eruption of the tooth comb. Rather, among lemurs, some species with extremely accelerated dental development exhibit a pattern of eruption of molars and of secondary teeth in direct opposition to the expectations of Schultz’s rule. We focus particularly on the pattern (order) and pace (absolute timing) of dental development and eruption in Avahi and Lepilemur – two relatively small, nocturnal folivores with rapid dental development. These taxa differ markedly in their eruption sequences (the premolars erupt after M2 and M3 in Lepilemur but not Avahi ). We offer an explanation for the failure of Schultz’s rule to predict these differences. Schultz’s rule presumes that eruption timing is dependent on the size of the jaw and that, therefore, molar crown formation and eruption will be delayed in species with slow-growing jaws. We show that a variety of processes (including developmental imbrication) allows the crowns of permanent teeth to form and to erupt into jaws that might appear to be too small to accommodate them.

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Section: Discussionmentioning

confidence: 99%

Schultz’s Unruly Rule: Dental Developmental Sequences and Schedules in Small-Bodied, Folivorous Lemurs

Godfrey¹,

Samonds²,

Wright³

et al. 2005

IJFP

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“…Many character states used for staging are in fact developmental transformations (sensu Bininda-Emonds et al, 2002); that is, transformations between two character states. This is inevitable, given that development is a continuous process.…”

Section: Character Homologymentioning

confidence: 99%

Developmental stages until hatching of the Lake Victoria cichlid Haplochromis piceatus (Teleostei: Cichlidae)

Jong

Witte

Richardson

2009

Journal of Morphology

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Because little is known about embryonic developmental stages in any haplochromine cichlid, we describe here a series of normal stages of the Lake Victoria cichlid Haplochromis piceatus. We collected 273 embryos and scored them for 47 morphological characters. The result was an illustrated series of 12 stages from embryonic shield until hatching based on live, fixed, and histological material. We defined each stage according to a single ''key'' character that applied to all embryos of that stage. Other characters forming part of the stage descriptions were not necessarily present in all embryos of a stage. We compare our findings with published studies of other freshwater teleosts and find wide variation in staging systems. Our data will form a baseline for further research on cichlid development.

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“…In addition to contributing to a revisitation of homologies, evo-devo can contribute original data to the reconstruction of phylogeny, especially through a comparative analysis of sequence heterochrony (e.g., Velhagen, 1997;Smith, 2001;Bininda-Emonds et al, 2002;Jeffery et al, 2005;Minelli et al, 2007). This approach deserves strong additional effort, especially in plants, where its potential is still virtually unexploited.…”

Section: Revisiting Homologies and Phylogenymentioning

confidence: 99%