The earliest and most basal form is the incompletely known Pisanosaurus, from the Late Triassic of Argentina.
Most prosauropods were distinctly smaller than sauropods but were still relatively large, but the oldest and most basal form, Saturnalia, was only about 5 feet (1.5 meters) long.
To "engage in politics" is a sinister act; to be "politically correct" is an immobilizing burden; to "politic" is the most basal form of cynical groveling.
To date we can infer that the most basal form of substrata relationship and reproduction within the extant flabellid genera is fixed (fragile pedicel), with transverse division as the main reproduction mode respectively (as observed in Truncatoflabellum).
The pubis, as in all ornithischians, had migrated backward to lie parallel to the ischium, as described above; but in all but the most basal forms, a new prepubic process began to grow forward from the pubis, eventually reaching far in front of the forward edge of the ilium and becoming expanded into a paddlelike shape in hadrosaurs.
All but the most basal forms exhibit this wing coupling.
The acetabulum is mediolaterally narrow and lacks a medial wall as in all sauropodomorphs, except for the most basal forms (e.g., Saturnalia, Thecodontosaurus [12], [50], [55].
The results of the current analysis are more consistent with the stratigraphic succession of early proboscideans in placing the oldest taxa (earliest Eocene Phosphatherium and Daouitherium [ 34, 46, 47]) as the most basal forms, slightly younger Numidotherium koholense [ 48] as the sister group of middle Eocene-to-Recent proboscideans, and Moeritherium in a more nested position.
The most basal known form, the Late Jurassic Compsognathus, was the size of a chicken and contemporaneous with the first known bird, Archaeopteryx.
Finally, the surprising presence of a CA3427 homolog in the genome of the choanoflagellate Monosiga brevicollis as well as in the genome of placozoan Trichoplax adhaerens, the most basal invertebrate form, supports a scenario of horizontal transfer by which all eukaryotic CA3427 homologs originated from the above Bacteroidetes ancestor.
Normal shoots were formed only by the most basal cuttings that formed lateral branches over prolonged culture in vitro, and those pre-cultured on low-sucrose medium (2.5%).
