Further insights on the nature of this evolutionary innovation could be gained through ontogenetic studies that disentangle how morphological constraints imposed by the rather stiff larynx box of pipids are overcome to allow the reversal to the ancestral air-driven vocalization in Pseudhymenochirus.
It has RAVISHED my ancestral line.
(A ) The ancestral smooth (SM) strain evolves to colonize the air liquid interface of a static microcosm.
We conclude that although Pseudhymenochirus probably has evolved a reversal to the ancestral non-pipid condition of air-driven sound production, the mechanism through which it occurs is an evolutionary innovation based on the derived larynx of pipids.
While the source used for sound production unexpectedly appear to reverse to the ancestral non-pipid condition (movement of the air column), associated anatomy evolved from a typical pipid-like larynx that likely imposed constraints to natural selection.
For insights into why ancestral penguins might have abandoned their command of the air, the researchers turned to the thick-billed murre, Uria lomvia, which nests on cliffs in Alaska, Canada, and other northerly sites.
The deployment of some of Russia's most advanced ground attack planes and fighter jets as well as multiple air defense systems at the base near the ancestral home of President Bashar al-Assad appears to leave little doubt about Moscow's goal to establish a military outpost in the Middle East.
Never before in American history has such a large group of new arrivals lived so close to their ancestral homelands, bound by proximity, language, a single time zone, cheap telecommunications and easy air travel.
ITV intended Quatermass to air in September 1979 as the flagship of its autumn season; advertising posters announced, "Earth's dark ancestral forces awaken to a summons from beyond the stars.
The saga of author Alex Haley tracing his ancestral roots to a young African boy kidnapped and sold into slavery was a phenomenon when it first aired on ABC in 1977, gripping a nation with its brutal but ultimately triumphant tale.
