synapomorphy

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Related to Synapomorphic: Apomorphy

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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Shaded boxes indicate monkey-derived virus sister taxa sampled during the same outbreak; inset at top left shows most parsimonious reconstructions of synapomorphic changes detected NS3, NS4B, and NS5 genes.
Only one character was listed as being synapomorphic for adults: the formation of a haustellum, a modified form of mouthparts not seen in any other order.
The possession of middle caudal vertebrae (which we regard as the last anterior caudal vertebrae) with posteriorly projecting caudal ribs, usually reaching the posterior margin of the centrum, is considered synapomorphic for Titanosauriformes (D'Emic, 2012).
The genus Papiliolebias can be distinguished from all other taxa of the Rivulidae by four synapomorphic conditions of the color pattern of males: unpaired fins dark blue, a white line along distal margin of anal fin, nine pelvic fin rays, and a metallic bluish green humeral blotch (Costa 1998b).
The subfamily of Cheirochelinae is a monophyletic group on the basis of synapomorphic characters (34-5).
This sister group appears to be neatly held together by the synapomorphic traits i.e., apicoventral margin of pygophore in ventral aspect broadly and shallowly sinuate (Zahid and Ahmad, 2011).
The sacral diapophyses are dorsoventrally low, and very distally expanded, a condition ususally considered synapomorphic of ceratophryids, being also present in B.
Additionally, some of the MSSC seem to be synapomorphic to all species in the genus: eyes touching below antennae, antennal stylus elongate (about 0.8 x of the body length) and fore tarsomeres modified, including enlarged pulvilli and reduced claws.
Descriptive statistics were compared between optimizations to garner support for one topology over the other and included tree length (e.g, number of evolutionary steps), retention index (RI; a measure of synapomorphic value; Farris, 1989a, b), and consistency index (Cl; a measure of homoplasy; Kluge and Farris, 1969).
noctucus are not very revealing, but he did recognize that the posterior median eyes are "unusually elongated." This apparently synapomorphic feature is actually shared with another of Chickering's species, Stenoonops padiscus from Jamaica, which was transferred to Longoonops by Platnick and Duperre (2010).
In that case, the trophosome would not serve as a morphological character unifying the family Siboglinidae, nor would the nonfunctional, occluded gut (Rouse, 2001) be a synapomorphic character of this taxon.