New research released in this month's issue of the journal PALAIOS describes an incredible fossil of an adult crocodilian preserved alongside its eggs. The fossil was discovered in central Germany at a site called Geiseltal in a brown coal mine back in 1932, but received little attention until the recent study. The authors explain how the fossil plays an important role in our understanding of the evolution of parental care.
Modern crocodilian mothers guard their eggs and young, but without any direct fossil evidence, scientists could only hypothesize that ancient crocodiles were also good mothers. This fossil shows the behavior likely goes back at least 45 million years into the fossil record.
"This is easily the most remarkable fossil crocodile I have ever seen", said lead author Dr. Alex Hastings of Martin-Luther-Universität Halle-Wittenberg, "the fossil tells us a lot about growth and reproduction, which you very rarely get the opportunity to study in the fossil record".
The good mother crocodilian belongs to an extinct species called Diplocynodon darwini, named after the renowned evolutionary thinker Charles Darwin. Despite being able to produce offspring, the 1-meter female (a little over 3 ft) was not done growing, shown by the fusion of vertebrae in the fossil.
Fusion of vertebrae is commonly used to judge how old dinosaurs and other fossil crocodiles were when they died, meaning this little mother crocodilian gives new information that will be helpful in researching other extinct forms of ancient life.
In 1932, the excavators took very detailed notes including the position and identity of each fossil taken from the small area of the brown coal mine. From these records, the researchers were able to rule out volcanism, flooding, and drought as likely causes of death. The eggs were not hatched or scavenged and there was no sign of injury on the adult.
The large amount of animal bodies collected from one layer of coal may instead show a mass die-off that could have happened during a short 'cold snap', even despite the warm climate. A similar situation occurred in 2010 in the Everglades of Florida (USA) where many animals that were adapted for a warm climate, including crocodiles, died quickly during the unusually cold weather of a 2-week 'cold snap'.
Another possibility is that the mother crocodilian instead died of a condition called dystocia, where an egg blocks the canal and prevents further egg-laying. This condition is very rare in modern crocodiles, but takes days or longer to lead to the death of the mother. This means that under either scenario, the mother evidently stayed with her eggs until death, showing a strong maternal instinct in this fossil crocodilian species.
Although excavation at the mine ended in the 1990s and the area has since been turned into a recreational lake, fossils from this site are still leading to new discoveries.
Alexander K. Hastings: "Rare In Situ Preservation of Adult Crocodylian with Eggs from the Middle Eocene of Geiseltal, Germany", Palaios, June 2015, DOI: 10.2110/palo.2014.062
Manuela Bank-Zillmann | idw - Informationsdienst Wissenschaft
Monitoring lava lake levels in Congo volcano
16.05.2018 | Seismological Society of America
Ice stream draining Greenland Ice Sheet sensitive to changes over past 45,000 years
14.05.2018 | Oregon State University
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...
A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.
The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...
Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.
Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...
A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.
Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...
02.05.2018 | Event News
13.04.2018 | Event News
12.04.2018 | Event News
18.05.2018 | Power and Electrical Engineering
18.05.2018 | Information Technology
18.05.2018 | Information Technology