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Bevarat maginnehåll hos mosasaurier

Jönsson, Ellen LU (2013) In Examensarbeten i Geologi vid Lunds universitet GEOL01 20131
Department of Geology
Abstract (Swedish)
Relationen mellan bytesdjur och rovdjur i forntida ekosystem kan rekonstrueras med hjälp av olika fossil som t.ex. kololiter, det vill säga förstenat mag- och tarminnehåll. Mosasaurier (familjen Mosasauridae) är en grupp marina ödlor med världsvid utbredning under sen krittid. De var generellt opportunistiska i sina födoval, men några arter som specialiserat sig på skalförsedda djur förekommer också. Bevarat maginnehåll från mosasaurier är känt från flera släkten och utgörs av fisk, bläckfisk, mollusker, sköldpaddor, fåglar, andra mosasaurier samt svanödlor. Denna studie beskriver ett skelettfynd som påträffades under revbenen på en individ av släktet Mosasaurus. Fyndet utgörs av sex benfragment med tydlig ytkorrosion och tolkas här som... (More)
Relationen mellan bytesdjur och rovdjur i forntida ekosystem kan rekonstrueras med hjälp av olika fossil som t.ex. kololiter, det vill säga förstenat mag- och tarminnehåll. Mosasaurier (familjen Mosasauridae) är en grupp marina ödlor med världsvid utbredning under sen krittid. De var generellt opportunistiska i sina födoval, men några arter som specialiserat sig på skalförsedda djur förekommer också. Bevarat maginnehåll från mosasaurier är känt från flera släkten och utgörs av fisk, bläckfisk, mollusker, sköldpaddor, fåglar, andra mosasaurier samt svanödlor. Denna studie beskriver ett skelettfynd som påträffades under revbenen på en individ av släktet Mosasaurus. Fyndet utgörs av sex benfragment med tydlig ytkorrosion och tolkas här som bevarat maginnehåll. Benfragmenten anses tillhöra en sköldpadda och skalplåtarnas ytstruktur är karaktäristisk för familjen Trionychidae. Tillsammans med benbitarna påträffades även metalliska noduler. Deras kemiska sammansättning och homogena inre struktur tyder på att de inte är del av maginnehållet. I stället rör det sig troligtvis om diagenetiskt bildade noduler. (Less)
Abstract
Relationships between prey and predator in ancient ecosystems can be reconstructed by interpreting fossil remains such as kololites (fossilized stomach and intestinal contents). They function as a direct evidence of food ingested and thus provide insights into the diet and digestive system of extinct animals. Mosasaurs (family Mosasauridae) are a cosmopolitan group of extinct marine lizards that evolved and eventually perished durng the Late Cretaceous. The variety of prey items suggests that mosasaurs were an opportunistic group in their choice of food, although some specialized species did exist. Preserved stomach contents are known from several genera and include fish, cephalopods, bivalves, turtles, birds, other mosasaurs and... (More)
Relationships between prey and predator in ancient ecosystems can be reconstructed by interpreting fossil remains such as kololites (fossilized stomach and intestinal contents). They function as a direct evidence of food ingested and thus provide insights into the diet and digestive system of extinct animals. Mosasaurs (family Mosasauridae) are a cosmopolitan group of extinct marine lizards that evolved and eventually perished durng the Late Cretaceous. The variety of prey items suggests that mosasaurs were an opportunistic group in their choice of food, although some specialized species did exist. Preserved stomach contents are known from several genera and include fish, cephalopods, bivalves, turtles, birds, other mosasaurs and plesiosaurs. This study describes stomach content that was found underneath the ribcage of a Mosasaurus. Six bone fragments with signs of corrosion are interpreted as the remains of gastric content. Furthermore, the bones are identified as turtle bones, and certain surface structures are characteristic of the family Trionychidae. Metallic nodules were also found in association with the bone fragments. The chemical composition and homogenous internal structure do not indicate that they are remnants of undigested stomach content. On the contrary, it is likely that they were diagenetically formed. (Less)
Please use this url to cite or link to this publication:
author
Jönsson, Ellen LU
supervisor
organization
alternative title
Gastric contents of mosasaurs
course
GEOL01 20131
year
type
M2 - Bachelor Degree
subject
keywords
gut content, Marlbrook-marlformationen, Mosasaurus, mosasaurier, maginnehåll, kololit, cololite, mosasaur, Marlbrook Marl Formation
publication/series
Examensarbeten i Geologi vid Lunds universitet
report number
363
language
Swedish
id
3971220
date added to LUP
2013-08-12 14:14:25
date last changed
2015-08-12 04:18:22
@misc{3971220,
  abstract     = {Relationships between prey and predator in ancient ecosystems can be reconstructed by interpreting fossil remains such as kololites (fossilized stomach and intestinal contents). They function as a direct evidence of food ingested and thus provide insights into the diet and digestive system of extinct animals. Mosasaurs (family Mosasauridae) are a cosmopolitan group of extinct marine lizards that evolved and eventually perished durng the Late Cretaceous. The variety of prey items suggests that mosasaurs were an opportunistic group in their choice of food, although some specialized species did exist. Preserved stomach contents are known from several genera and include fish, cephalopods, bivalves, turtles, birds, other mosasaurs and plesiosaurs. This study describes stomach content that was found underneath the ribcage of a Mosasaurus. Six bone fragments with signs of corrosion are interpreted as the remains of gastric content. Furthermore, the bones are identified as turtle bones, and certain surface structures are characteristic of the family Trionychidae. Metallic nodules were also found in association with the bone fragments. The chemical composition and homogenous internal structure do not indicate that they are remnants of undigested stomach content. On the contrary, it is likely that they were diagenetically formed.},
  author       = {Jönsson, Ellen},
  keyword      = {gut content,Marlbrook-marlformationen,Mosasaurus,mosasaurier,maginnehåll,kololit,cololite,mosasaur,Marlbrook Marl Formation},
  language     = {swe},
  note         = {Student Paper},
  series       = {Examensarbeten i Geologi vid Lunds universitet},
  title        = {Bevarat maginnehåll hos mosasaurier},
  year         = {2013},
}