synapomorphy


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Related to synapomorphy: Symplesiomorphy

synapomorphy

[si′nap·ə‚mȯr·fē]
(systematics)
A derived trait shared by two or more taxa that is believed to reflect their shared ancestry.
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Acceptable definitions of the draft PhyloCode names include "node-based" or "stem-based" definitions, with at least two species and/or specimens (or maybe "taxa") as "specifiers" and no reference to any characters, or "apomorphy-based" definitions, with two specifiers of different types; namely, a taxon (species or specimen?) and a synapomorphy (or homologous character) (Cantino & de Queiroz, 2000).
190-192, 195-198) has long been recognized as an araneoid synapomorphy (Coddington 1986, 1990; Hormiga et al.
One of the interesting results of these phylogenetic analyses based on structural characters is our finding that the subfamily Cactoideae is a supported clade (b74/j66% and b60/j55%), recovered as monophyletic in both analyses, based on the presence of highly reduced leaves (character 8), interpreted as the synapomorphy for the clade.
A 6-base deletion is a potential synapomorphy of Cosmelieae and Styphelieae, but this insertion also appears inPrionotes.
Another diagnostic character, lack of dorsal femoral trichobothria (7/1) serves as synapomorphy under ACCTRAN (Fig.
Similarly, the presence of circular stomates is a synapomorphy for Stangeria and Bowenia, the two extant genera that form the Stangeriaceae (Stevenson, 1992), and its presence in Mesodescolea supports the hypotheses that this fossil genus belongs to the Stangeriaceae.
An additional synapomorphy of having 6 to 10 sterile appendages per axillary dwarf shoot (character H) occurs in one of these trees.
Previous phylogenetic analyses concluded that the loss of the tarsal claw was a synapomorphy for Erigoninae (e.g., Hormiga 2000; Miller & Hormiga 2004).
(1995) - specifically, the resolution of Anomochloa and Streptochaeta as elements of the earliest lineage of grasses to diverge from the line that includes all others - the pseudospikelets present in these taxa can be regarded either as a synapomorphy of this lineage (i.e., Anomochlooideae) or as a plesiomorphy of the grasses that is retained only in these two genera, though in modified form in Streptochaeta (Judziewicz & Soderstrom, 1989).
The main synapomorphy for the genus Notasteron and the derived genera of the Asteron complex (Basateron, Cavasteron, Euasteron, Holasteron, Minasteron, Spinasteron, Tropasteron and Masasteron) is the large semicircular DTA with marginal fold, well developed retrolateral-(RDTA) and prolateral extension (PE) (character 6/3).
The presence of keels on the bulb is a synapomorphy of Theraphosinae (Raven 1985; Perez-Miles et al.