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Establishment and Maintenance of Gnotobiotic American Cockroaches Periplaneta americana
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Cockroaches probably cleaned up after dinosaurs.

Peter Vršanský1, Thomas van de Kamp, Dany Azar

  • 1Geological Institute, Slovak Academy of Sciences, Bratislava, Slovakia ; Arthropoda Laboratory, Paleontological Institute, Russian Academy of Sciences, Moscow, Russia.

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Extinct cockroaches may have consumed dinosaur feces, acting as early decomposers. Analysis of fossilized cockroach gut contents suggests they processed wood particles, indicating a diet potentially including herbivore dung.

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Area of Science:

  • Paleontology
  • Paleoecology
  • Insect Evolution

Background:

  • Herbivorous dinosaurs produced significant waste, but efficient decomposers like modern dung beetles were scarce in the Mesozoic.
  • Extinct Blattulidae cockroaches coexisted with herbivorous dinosaurs, suggesting a potential ecological role.

Purpose of the Study:

  • To investigate the feeding habits of extinct Blattulidae cockroaches.
  • To test the hypothesis that these ancient cockroaches consumed dinosaur excrement.

Main Methods:

  • Synchrotron X-ray microtomography was used to analyze the gut contents of an immature cockroach preserved in Lebanese amber.
  • Analysis focused on identifying and characterizing wood particles within the fossilized gut.

Main Results:

  • Fossilized cockroach gut contents contained 1.06% wood particles with smooth edges, indicative of external pre-digestion.
  • Particle size distribution and lack of fungal damage suggest the wood originated from herbivore feces, not direct plant consumption.
  • Biochemical breakdown of smaller wood particles occurred in the cockroach's hindgut.

Conclusions:

  • The findings support the hypothesis that extinct Blattulidae cockroaches consumed dinosaur feces.
  • This suggests an ancient role for cockroaches in waste decomposition, predating modern dung beetles.
  • The study implies that gut symbionts capable of lignin decomposition may have been acquired through coprophagy (feces consumption).