The phrase "a plesiomorphic character of" is correct and usable in written English.
It can be used in discussions related to evolutionary biology, particularly when describing traits that are ancestral or primitive in a particular lineage.
Example: "The presence of a notochord is considered a plesiomorphic character of chordates, indicating their shared ancestry."
Alternatives: "an ancestral trait of" or "a primitive characteristic of".
From the available data and from comparison with the situation in chilopods, a closely related mandibulate outgroup, we conclude that an olfactory lobe organized into spheroidal glomeruli is a plesiomorphic character of the tetraconate brain.
The sclerotization in the outer seedcoat has been observed in some basal orchid groups, such as Apostasia (the subfamily Apostasioideae) and Vanilla (the subfamily Vanilloideae), suggesting a plesiomorphic character of the seed in Orchidaceae (Nishimura and Tamura [1993]; Nishimura and Yukawa [2010]).
Such a salt tolerance might indeed be a plesiomorphic character of sailfin silversides.
Our analyses suggest that an endosymbiotic relationship with nematodes is a plesiomorphic character of the (C + D) clade.
The presence of an epithelial boundary is a plesiomorphic character of triploblastic animals, and therefore, we cannot explore the early evolution of animal epithelia using only triploblastic model systems.
Moreover, pulmonate dorsal bodies might be homologous to the juxtaganglionar organs of some opisthobranchs [ 60], and thus might represent a plesiomorphic character of Panpulmonata and a potential synapomorphy of Euthyneura.
Together with the data provided by [ 33] on a chelicerate and a crustacean, our onychophoran data further support the idea that such early expression of col is not a plesiomorphic character for arthropods but a derived character.
However, even though maxillary barbels seem to have evolved independently several times [ 25], the presence of such structures in A. barbata is regarded as a plesiomorphic character for the clade to which this species belong.
In case this will stand critical future assessment, the ventromedian muscle would likewise constitute a plesiomorphic character for Mollusca.
As the genus Aurantiosporium, also a member of the Ustilentylomataceae, forms its sori in the spikelets of Cyperaceae [ 40], future work is needed to resolve the question if sorus formation in the inflorescence is a plesiomorphic character for the Microbotryaceae.
Although the interstitial-Ag-NOR pair is absent in bathyergids, erethizontoids, dasyproctids, and caviids [ 39]; it appears to be a plesiomorphic character for the hystricomorphs.
