plesiomorphic


Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to plesiomorphic: cladistics, Cladistic analysis, Plesiomorphy

ple·si·o·mor·phic

(plē'sē-ō-mōr'fik),
Similar in form.
Synonym(s): plesiomorphous
Farlex Partner Medical Dictionary © Farlex 2012

plesiomorphic

(of characters) primitive or ancestral.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
None of the existing specimens shows enough detail to ascertain the phalangeal formula, but, based on other examples of Rhynchosauroides, the phalangeal formulae for both manus and pes are probably 2-3-4-5-3 (e.g., Baird 1957), which is the plesiomorphic count for Amniota.
The separation of the outgroup Orthoschizops from all species of Mustha is supported by almost all character-state changes of the characters scored (Table 2).Our tree indicates that the two most plesiomorphic species are izmirensis and serrata.
The ancestral state of this character is not determined, but an unfused condition has been considered plesiomorphic for Chrysopidae [2].
The view of amphidromy as plesiomorphic is not universally held, stemming primarily from suggestions by Pereira (1989) and Pereira & Garcia (1995), and the opposite might be true for another important freshwater group, the specious genus Macrobrachium (Palaemonidae).
There is substantial support that the embolus is a plesiomorphic feature and homologous in all Gnaphosidae.
They can be either ancestral states, termed plesiomorphic, or derived (descendant) states, termed apomorphic.
Data on the reproductive behavior of these two subfamilies are crucial to provide both a robust hypothesis about the plesiomorphic form of egg assistance in gonyleptids and a more complete scenario of the transitions between different forms of parental care in the family.
were the only available outgroups for our CO3 data set, these did not provide a useful rooting for inferring whether these alternative matching states are plesiomorphic or derived.
However, possession of vomerine teeth is a plesiomorphic condition in rivulids, occurring in most aplocheiloids, including R.