Troodon Posted Saturday at 09:15 PM Share Posted Saturday at 09:15 PM Not very much is published on rare teeth. I'm trying to compile some information so that collectors have something to look at. Might not get them all the answers but its a start. Any discrepancies seen in this info please let me know. If you see anything published that can add to those listed please let me know. Species included in this topic Neovenator salerii Eotyrannus lengi Megalosaurus bucklandi Proceratosaurus bradleyi Acrocanthosaurus atokensis Deinonychus antirrhopus (Page 2) Duriavenator hesperis (Page 2) Coelophysis bauri (Pg 2 - Link to Triassic) Daemonosasurus chauliodus (Pg2 - Link to Triassic) Tawa hallae (Pg 2 - Link to Triassic) Majungasaurus crenatissimus (Pg 3) Neovenator salerii Formation: Wessex Formation Location: Typically Isle of Wight Characteristics: Some lateral crowns show transverse and/or marginal undulations adjacent to the distal and/or mesial carinae Interdenticular sulci between distal denticles may be present Enamel Surface Texture : "ent" in illustration Mesial crowns have their mesial carina twisting strongly toward lingual side A flattened surface and or depression adjacent to the distal carina on the lingual side : "cos" in illustration Mesial carina not reaching the base on most lateral crowns Mesial denticles are shorter and distal ones Measurements: (From Hendrickx 2019 study) (3 isolated lateral teeth) DSDI: 0.833 to 1.03 (Avg 0.96) Distal Density: 14.5 to 18 / 5mm (Avg 15.8 / 5mm) Mesial Density: 15 / 5mm (Avg 15 / 5mm) Ratio's: CHR 1.5 to 2.2 (Avg 1.8), CBR 0.54 to 0.57 (Avg 0.55) Eotyrannus lengi Formation: Wessex Formation Location: Isle of Wight Characteristics: Slightly twisted mesial carina not extending to the root Distal denticles elongated in lateral teeth DSDI should be > 1.2 Transverse undulations: absent Interdenticular sulci may be present Measurements: (From Hendrickx 2019 study) (One isolated Pre-max tooth) DSDI: 1.06 Distal Density: 14.1 / 5mm Mesial Density: 15 / 5mm Ratio's: CHR: 2.6, CBR: 1.2 Measurements: (From @paulyb135 personal collection) (Isolated Lateral tooth) DSDI: 1.47 Distal Density: 3.4 / 1 m Mesial Density: 5 / 1mm Ratio's: CHR: 2.5, CBR: 0.8 Lateral Tooth Premaxillary Tooth (part of holotype) Megalosaurus bucklandi Formation: Tayton Limestone Location: Stonefield Slate Beds, Oxfordshire, Gloucesters Other Occurrences: Chipping Norton Limestone Formation Sharp's Hill Formation Characteristics: Transverse undulations can be well visible and numerous Interdental sulci can be present on both carinae Mesial denticles larger than Distal denticles (DSDI <.08) in some lateral distal teeth Mesial carina does not reach the cervix in most lateral crowns (Can extend 55 to 65% of crown height) Bilobate denticles can be present in mesial carina (see illustration) The mesial carina on mesial teeth is central located not twisted lingually and the distal carina is also centrally positioned weakly offset labially Measurements: (From Hendrickx 2019 study) (10 teeth, 8 isolated, 1 dentary, 1 maxillary) DSDI: 0.8 to 1.03 (Avg 0.9 ) Distal Density: 8.75 to 20 / 5mm (Avg 13 / 5mm) Mesial Density: 8.5 to 20 / 5mm (Avg 12.1 / 5mm) Ratio's: CHR 1.6 to 2.5 (Avg 2.1), CBR 0.39 to 0.68 (Avg 0.55) Bilobate denticles in Mesial carina Sixth right dentary tooth of Megalosaurus bucklandi Mantell, 1827 (OUMNH J13505), crown (B1 ), mesial (B2 ) and distal (B3 ) denticles in labial views, enamel texture Holotype Tooth Proceratosaurus bradleyi Formation: White Limestone,, Great Oolite Location: Gloucestershire, UK Other Occurrences: Not aware of others Characteristics: Very Fine Serrations on both Carina A basal constriction between crown & root is present in some premaxillary teeth (see photo) Mesial denticles smaller than Distal denticles Teeth are relatively small, holotype (considered late juvenile/subadult) see CH measuremets The premaxillary teeth are asymmetrical in cross section, with the mesial carina being displaced lingually The maxillary teeth are transversely flattened, strongly recurved, and have serrated mesial and distal carinae (see photo) In both the premaxillary and fully erupted maxillary teeth, the anterior carina does not extend all the way to the base of the crown, but ends at approximately half the height Individual denticles are chisel-shaped, rounded, and perpendicular to the long axis Basel ridges are seen on some Premaxillary and dentary teeth (see photo) Measurements: (From Hendrickx 2019 study) (9 teeth, 4 maxillary, 5 dentary, ) DSDI: 1 to 1.5 (Avg 1.28 ) Distal Density: 22 to 26 / 5mm (Avg 25.5 / 5mm) Mesial Density: 30 to 37.5 / 5mm (Avg 34 / 5mm) Ratio's: CHR 1.8 to 2 (Avg 1.9), CBR 0.5 to 0.8 (Avg 0.6) Crown Height (CH) Premaxillary teeth (5.3 to 6.7 mm), Maxillary teeth (4 to 12.7 mm), Dentary (4.2 to 11 mm) Reference is 4 good source of information Basal constriction Premaxillary tooth Ridges seen on some Premaxillary and Dentary Teeth Maxillary Teeth Anterior Dentary Teeth Acrocanthosaurus atokensis Formation: Antler Formation, Trinity Group Location: McCurtain County, Oklahoma (Study Group) Other Occurrences: Twin Mountains Formation (Trinity Group), Texas Arundel Formation, Maryland Cloverly Formation, Wyoming Cedar Mountain Formation, Utah* * Acrocanthosaurus sp.. tooth morphology not described. Please note it illegal to sell/purchase these teeth (found on Grand Staircase National Monument) Characteristics: Apical denticulation (Contiguous keels with denticles continuing over the tip) (Lipka paper) Distal denticles perpendicular to axis Mesial denticles inclined to axis Transverse and marginal undulations can be present Mesial carina does not reach the base in most crowns Interdenticular sulci not evident Braided enamel (Not sure if its on all or some crowns) Measurements: (From Hendrickx 2019 study) Premaxillary teeth (4) DSDI: 1.3 to 1.5 / 5mm (Avg 1.45 / 5mm) Distal Density: 11.5 to 13.3 / 5mm (Avg 12.5 / 5mm) Mesial Density: 17 to 19 / 5mm (Midline Avg 18 / 5mm) (Apically Avg: 13.3 / 5 mm) Ratio's: CHR: 2.2 to 2.6 (Avg 2.4), CBR: 0.58 to 1 (Avg 0.76) Maxillary teeth (11) DSDI: .73 to 1.2 / 5mm (Avg 0.97 / 5mm) Distal Density: 11.5 to 15 / 5mm (Midline Avg 13.7 / 5mm) (Apically Avg: 11.7 / 5 mm) Mesial Density: 17 to 19 / 5mm (Midline Avg 18 / 5mm) (Apically Avg: 13.3 / 5 mm) Ratio's: CHR: 2.0 to 2.6 (Avg 2.3), CBR: 0.5 to 0.67 (Avg 0.58) Dentary teeth (17) DSDI: 0.83 to 1.0 / 5mm (Avg 0.95 / 5mm) (only 6 teeth) Distal Density: 12.5 to 16 / 5mm (Midline Avg 14.3 / 5mm) (Apically Avg: 12.7 / 5 mm) Mesial Density: 11.8 to 16.2 / 5mm (Midline Avg 11.7 / 5mm) (Apically Avg: 13.4 / 5 mm) Ratio's: CHR: 1.3 to 2.8 (Avg 2.1), CBR: 0.48 to 0.9 (Avg 0.61) Maxillary Jaw (#1 to 4) showing : tun: transverse undulations mun: marginal undulations dca: displaced carina Scale: 1 cm Maxillary tooth (#6) with mun and tun Scale: 1 cm Braided enamel texture on isolated tooth Believe these are distal denticles Scale: 1 mm will continue to add to this post... Reference Material: (1)Hendrickx et al : Dental features in theropods 2019 https://palaeo-electronica.org/content/2019/2806-dental-features-in-theropods (2)Hendrick et al : Taxonomic identification of isolated theropod teeth: The case of the shed tooth crown associated with Aerosteon https://www.sciencedirect.com/science/article/abs/pii/S0195667118303860?via%3Dihub (3)Hendrick et al. : The Dentition of Megalosaurid Theropods https://bioone.org/journals/acta-palaeontologica-polonica/volume-60/issue-3/app.00056.2013/The-Dentition-of-Megalosaurid-Theropods/10.4202/app.00056.2013.full (4)Oliver Rauhut et al Cranial osteology and phylogenetic position of the theropod dinosaur Proceratosaurus bradleyi (Woodward, 1910) from the Middle Jurassic of England 2008 (5)Thomas Lipka The affinities of the enigmatic theropods of the Arundel Clay Facies 15 1 Quote Link to post Share on other sites
BellamyBlake Posted Sunday at 01:01 AM Share Posted Sunday at 01:01 AM Informative as always, thank you for your work! 1 Quote Link to post Share on other sites
Troodon Posted Sunday at 12:30 PM Author Share Posted Sunday at 12:30 PM Deinonychus antirrhopus Formation: Cloverly Formation Location: Carbon County, Montana (Study Group) Other Occurrences: Antler Formation, Oklahoma Arundel Formation, Maryland Cloverly Formation, Wyoming Cedar Mountain Formation, Utah* * Please note it illegal to sell/purchase these teeth (found on Grand Staircase National Monument) Characteristics: Small crowns 18.8 mm largest in study (Avg 13 mm) Very large difference in serration density between Mesial and Distal Carina (DSDI 1.8 Avg) Mesial Carina on Mesial teeth reaching the base in most crowns Mesial Carina on Lateral teeth not reaching the base in most crowns Serrations may not be present on Mesial edge Transverse undulations can be present Interdenticular sulci may be present Measurements: (From Hendrickx 2019 study) Teeth (16) DSDI: 1.4 to 2.0 / 5mm (Avg 1.79 / 5mm) Distal Density: 13.5 to 19.1 / 5mm (Avg 16.7 / 5mm) Mesial Density: 27 to 35 / 5mm (Avg: 30.1 / 5 mm) Ratio's: CHR: 1.3 to 2.2 (Avg 1.68), CBR: 0.35 to .6 (Avg 0.49) From Peabody Bulletin 30 Osteology of Deinonychus antirrhops , John Otrom Dentary or Maxillary Tooth (A) Posterior Premaxillary Tooth (B) Intermediate Premaxillary Tooth (C), Anterior premaxillary Tooth (D) Maxillary Tooth serrations Duriavenator hesperis Formation: Upper Inferior Oolite Location: Greenhill, Sherborne, Dorset Other Occurrences: None known Characteristics: Transverse undulations absent on study maxillary teeth, present on dentary teeth Interdental sulci are rare in Mesial Denticles and short if present but can well developed on Distal side The basal extent of the Mesial carina is variable and at 1/5th of the crown at Mx6 Bilobate denticles can be present in mesial carina (see illustration) The mesial carina on mesial teeth is central located not twisted lingually and the distal carina is also centrally positioned weakly offset labially Measurements: (From Hendrickx 2019 study) (4 teeth, 2 dentary, 2 maxillary) DSDI: Maxillary (Avg 1.1), Dentary (Avg 0.86) Distal Density: Maxillary (Avg 11.8 / 5mm), Dentary (Avg 11.3 / 5mm ) Mesial Density: Maxillary (Avg 12.5 / 5mm), Dentary (Avg 9.6 / 5mm ) Ratio's: CHR Maxillary (Avg 2.0), Dentary (Avg 1.6), CBR Maxillary (Avg 0.45), Dentary (Avg 0.48) CBR on a Premax2 0.62 Sixth Maxillary tooth : A2- mesial, A3-Distal Updated Triassic Teeth from New Mexico Coelophysis bauri Daemonosasurus chauliodus Tawa hallae Link: http://www.thefossilforum.com/index.php?/topic/83060-identification-of-teeth-from-triassic-dinosaurs-of-new-mexico/ Reference Sources same as page 1 unless noted 6 Quote Link to post Share on other sites
IsaacTheFossilMan Posted Sunday at 12:33 PM Share Posted Sunday at 12:33 PM Thank you very very much for your hard work, @Troodon, it's highly appreciated! 1 Quote Link to post Share on other sites
Troodon Posted Sunday at 01:56 PM Author Share Posted Sunday at 01:56 PM Majungasaurus crenatissimus Formation: Maevarano Location: Berivotra Village, Madagascar Other Occurrences: None known Characteristics: Transverse undulations can be present Interdental sulci can be present Mesial carina reaching the cervix(base) in most teeth Profile of lateral teeth is that the distal edge is perpendicular to base (see illustration) Measurements: (From Hendrickx 2019 study) (23 teeth, 15 dentary, 4 maxillary, 4 premaxillary) DSDI: Premaxillary (Avg 0.9) Maxillary (Avg 1.04), Dentary (Avg 1.0) Distal Density: Premaxillary (Avg 8.1 / 5mm), Maxillary (Avg 9.8 / 5mm), Dentary (Avg 9.8 / 5mm ) Mesial Density: Premaxillary (Avg 7.3 / 5mm), Maxillary (Avg 12.5 / 5mm), Dentary (Avg 9.8 / 5mm ) Ratio's: CHR Premaxillary (1.8), Maxillary (Avg 1.84), Dentary (Avg 1.756), Ratio's: CBR Premaxillary (Avg 0.72), (Maxillary (Avg 0.49), Dentary (Avg 0.6) First Two Premaxillary teeth Mesial dentition S shaped cross-section on first few mesial premaxillary/dentary teeth Mesial Denticles of 2nd Dentary Tooth Distal side: Irregularly textured enamel surface and interdenticular sulci of the sixth right maxillary tooth Crown curvature Maxillary Dentition Dentary Dentition Reference: Same as the initial post also: Dental Morphology and variation in Majungasaurus Crenatissimus (theropoda:Abelisauridae) from the late cretaceous of Madagascar Joshua B Smith 2010 1 1 Quote Link to post Share on other sites
Runner64 Posted Sunday at 06:18 PM Share Posted Sunday at 06:18 PM @Troodon thank you tremendously, this will be an incredible resource. Are you ok if I add to this following the same format? Or, I could PM you some characteristics I’ve found in the past from papers. 1 Quote Link to post Share on other sites
Troodon Posted Sunday at 06:58 PM Author Share Posted Sunday at 06:58 PM 1 minute ago, Runner64 said: @Troodon thank you tremendously, this will be an incredible resource. Are you ok if I add to this following the same format? Or, I could PM you some characteristics I’ve found in the past. Well I am reluctant to add rare teeth that collectors have identified themselves unless they are supported by published document that contains specific data and the assignment is very clear and obvious. If you have rare any that fit the bill PM Quote Link to post Share on other sites
Runner64 Posted Sunday at 07:32 PM Share Posted Sunday at 07:32 PM 33 minutes ago, Troodon said: Well I am reluctant to add rare teeth that collectors have identified themselves unless they are supported by published document that contains specific data and the assignment is very clear and obvious. If you have rare any that fit the bill PM Yep completely understandable! I will send you a message over the next couple days with some papers. Quote Link to post Share on other sites
Troodon Posted Monday at 12:51 PM Author Share Posted Monday at 12:51 PM added Acrocanthosaurus atokensis 1 Quote Link to post Share on other sites
Troodon Posted Monday at 09:33 PM Author Share Posted Monday at 09:33 PM Added Deinonychus antirrhopus on pg 2 1 Quote Link to post Share on other sites
Troodon Posted Tuesday at 07:33 PM Author Share Posted Tuesday at 07:33 PM Added Duriavenator hesperis Coelophysis bauri Daemonosasurus chauliodus Tawa hallae Quote Link to post Share on other sites
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