Lmst

Please watch my newest #animated #YouTube #video about the #Cambrianexplosion
https://youtu.be/EhUQfMcxUGs?si=5PALKW_J5fkkxOV6

It was a very #shortperiod in Earth's history, began ca. 541 million years ago and lasted only ~13-25 million years, during which giant #evolutionary leaps occurred in #animals. I.a.under influence of increased #oxygen levels, #Bilateria, primeval #Protostomia and #Deuterostomia evolved. We Tetrapoda much later derived from the latter.
©#StefanFWirth 2025

#Pics
©S F.Wirth,#AIassisted own work

Illustration of Cambrian explosion showing an Cambrian ocean and fast and important evolutionary steps in the animal kingdom: the evolution from simple cell tissue over sponge and jellyfish like ancestors to two sided symmetrical forms (Bilateria) and primeval Protostomia (e.g. Mollusca and Arthropoda) and Deuterostomia (e.g. Echinodermata, fish, Tetrapoda). AI assisted Illustration pictures and video files, all manually edited and modified, © Stefan F. Wirth December 2025

Trilobita (primeval Arthropoda, commonly dedicated to the ancestors line of Chelicerata).
Illustration of Cambrian explosion showing an Cambrian ocean and fast and important evolutionary steps in the animal kingdom: the evolution from simple cell tissue over sponge and jellyfish like ancestors to two sided symmetrical forms (Bilateria) and primeval Protostomia (e.g. Mollusca and Arthropoda) and Deuterostomia (e.g. Echinodermata, fish, Tetrapoda). AI assisted Illustration pictures and video files, all manually edited and modified, © Stefan F. Wirth December 2025

Calcium skeletons of sponge like Archaeocyatha.
Illustration of Cambrian explosion showing an Cambrian ocean and fast and important evolutionary steps in the animal kingdom: the evolution from simple cell tissue over sponge and jellyfish like ancestors to two sided symmetrical forms (Bilateria) and primeval Protostomia (e.g. Mollusca and Arthropoda) and Deuterostomia (e.g. Echinodermata, fish, Tetrapoda). AI assisted Illustration pictures and video files, all manually edited and modified, © Stefan F. Wirth December 2025

Calcium skeletons of sponge like Archaeocyatha, here covered with algae. Algae were increasing Earth's oxygen level via photosynthesis significantly. An important basis for the Cambrian explosion.
Illustration of Cambrian explosion showing an Cambrian ocean and fast and important evolutionary steps in the animal kingdom: the evolution from simple cell tissue over sponge and jellyfish like ancestors to two sided symmetrical forms (Bilateria) and primeval Protostomia (e.g. Mollusca and Arthropoda) and Deuterostomia (e.g. Echinodermata, fish, Tetrapoda). AI assisted Illustration pictures and video files, all manually edited and modified, © Stefan F. Wirth December 2025

`By generating localized Chordin sources in the Chordin morphant background, we showed that mobile Chordin is necessary and sufficient to establish a peak of BMP signaling opposite to Chordin source. These results provide evidence for BMP shuttling in a bilaterally symmetric cnidarian and suggest that BMP shuttling may have been functional in the potentially bilaterally symmetric cnidarian-bilaterian ancestor.`

https://www.science.org/doi/10.1126/sciadv.adu6347

#evolution #zoology #cnidaria #bilateria

Abalde & Jondelius characterize opsins and phototransduction genes in Xenacoelomorpha, identifying cnidarian-like and lineage-specific opsins.

🔗 doi.org/10.1093/gbe/evaf078

#genome #evolution #bilateria

#Evolution's recipe book: How '#copy_paste' #errors led to insect flight, octopus camouflage and human cognition.

##gene_expression #transcriptomics #bilateria

https://phys.org/news/2024-04-evolution-recipe-errors-insect-flight.html

Exam period is upon us

Today #diversityofLife for 1st year

Best question, describe and contrast #sponge and #bilateria #anatomy n #bodyplan

Tomorrow #HumanGenetics for 3rd year
#UniversityIceland

Pic from #GusGus concert

📃Do chicks prefer odd behavior in others? Variability in front-back orientation during movement is more attractive and might indicate the appeal of behavioral unpredictability, a hallmark of living things, report Orsola Rosa Salva, Elena Lorenzi & Giorgio Vallortigara of the Animal Brain Cognition group in Animal Cognition #bilateria
https://rdcu.be/c7W0W

"Together, our findings suggest that the temporal decoupling of head and trunk formation, as maximally observed in head larvae, facilitated larval evolution in Bilateria. This diverges from prevailing scenarios that propose either co-option or innovation of gene regulatory programmes to explain larva and adult origins"
https://www.nature.com/articles/s41586-022-05636-7#:~:text=Together%2C%20our%20findings,and%20adult%20origins

#bilateria #bilateralSymmetry #symmetry #animalEvolution #evolution #annelids #developmentalBiology #devbio #genetics #transcriptomics #epigenetics

#Bilateria

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