Bevarat maginnehåll hos mosasaurier
(2013) In Examensarbeten i Geologi vid Lunds universitet GEOL01 20131Department 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:
http://lup.lub.lu.se/student-papers/record/3971220
- author
- Jönsson, Ellen LU
- supervisor
-
- Mats Eriksson LU
- Johan Lindgren LU
- organization
- alternative title
- Gastric contents of mosasaurs
- course
- GEOL01 20131
- year
- 2013
- 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}},
language = {{swe}},
note = {{Student Paper}},
series = {{Examensarbeten i Geologi vid Lunds universitet}},
title = {{Bevarat maginnehåll hos mosasaurier}},
year = {{2013}},
}