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However, a closer study of the phylogenetic relationship between these two genera with adequate taxon sampling is still elusive.
(They also transferred the Easter Cactus – now Hatiora gaertneri – to Schlumbergera as S. gaertneri, initiating a lasting confusion between these two genera).
While the affinity between these two genera has never been previously proposed, it is worth noticing that this clade is in fact supported by a morphological synapomorphy.
Although Thigmokeronopsis and Pseudokeronopsis are placed into the family Pseudokeronopsidae by most investigators e.g., [ 1], [8], [9,14], a sister relationship between these two genera is not revealed in any of our trees (Fig. 2 4), nor in previous molecular phylogenetic analyses [11], [12], [22], [40].
The affinities between these two genera are supported by several cranial features that are absent in Nemegtosaurus, including the length of the antorbital fenestra subequal or larger than the orbit, robust basal tubera, unexpanded mandibular symphysis, maxillary jugal process tapering posteriorly, and prefrontal with narrow and elongated anterior process.
This demonstrates large gene flow occurring between these two genera.
Similar(38)
However, a direct comparison between Arum and these two genera is difficult as both taxa are much more species-rich (Aristolochia > 120 species, Ceropegia > 180 species) and have a much wider distribution range than Arum.
On the other hand, Route66 is more conserved between these species than between Sorghum and maize (>91% whereas these two genera only diverged 12 MYa).
This grouping supported the relationship observed between these three genera in the RpoB' tree, which can be corroborated by physiological information regarding phototrophy that will be discussed later.
However, these two genera were removed from Artemisia s.l., and on the basis of spiny pollen have been considered transitional between the Artemisia-group and four radiate genera: Tridactylina Arctanthemum, Brachanthemum, and Dendranthema.
Because these findings were inferred from the analyses of three acholeplasma and five phytoplasma genome sequences, it remains unclear as to what extent these differences between the two genera can be truly generalised or if the other acholeplasmas might share some of these features of their genetic repertoire with the phytoplasmas.
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