cladistics

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Related to Apomorphic: apomorphine, Synapomorphic
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Synonyms for cladistics

a system of biological taxonomy based on the quantitative analysis of comparative data and used to reconstruct cladograms summarizing the (assumed) phylogenetic relations and evolutionary history of groups of organisms

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References in periodicals archive ?
Owing to the vital, water-conserving roles of the AQP2, -5, and -6 gene clusters in extant amphibians, sauropsids, and mammals, it is suggested that lineage-specific evolution of these apomorphic gene clusters was permissive for vertebrate terrestrial adaptation.
In particular, we presume that spiny proventriculi--derived from an omnivorous ancestor and modified for herbivory--are ubiquitous or at least plesiomorphic in Phasmatodea, and "gastric caeca" plus an oesophageal valve are apomorphic for Euphasmatodea.
This might suggest that the possession of ovaries with an unpaired structure by species in the family Pyrgodesmidae is an apomorphic condition, which probably reflects the small size of individuals in this family (< 10 mm) and their short lifespan of about 3 months (Adis et al.
Sphenisciformes is applied in a more exclusive sense to the clade including all Pansphenisciformes that share the apomorphic loss of aerial flight.
The dorsal processes of the premaxillae are apomorphic, being longer and more vertical than those of any extant or fossil salmonine.
The likely apomorphic reversal of shape of the colobathristid forewings has probably co-evolved jointly with transformation of the shape of mesoscutellum.
Biramous limbs and nauplius larvae, apomorphic characters for crustaceans, can readily be optimized on an evolutionary tree, showing students why these taxa and other crustaceans share taxonomic identity.
In fact this genus could be included within Neornithes on the basis of the following apomorphic feature: humeral articular surface not extended sternally beyond the omal margin of the scapular cotyla (see figure 3).
The number of states per character ranged from 2 to 7, and the total number of apomorphic states was 80.
Determining what are plesiomorphic and what are apomorphic states is central to phylogenetic systematics and is termed character polarisation (Cameron and Groves 2004: 107).
These characters were considered apomorphic by Silva (2004).
Subsequently, Lindberg (1998) treated it as the most apomorphic family in Acmaeoidea; more recently, Waren & Bouchet (2005) have reinstated it at a higher level and have recognized it as the superfamily Neolepetopsoidea.
We may conclude that Eisenia foetida spermatozoon is of a apomorphic type since it presents several evolved characteristics such as: a very large acrosome; the primary acrosomic vesicle is held within the acrosomal tube, the axial rod is very elongated and ended in a developed capitulum and a number of mitochondria of the midpiece equal to six.