ornithischia help!

["Nick Gardner" <ratites637@hotmail.com>]

Hi!

I've collected data for the following characters, but not sure how to 
arrange it and hoping for help from someone with more experience.

PREDENTARY MEDIAN RIDGE

This is character 5 in my analysis currently, I'm not sure if the tubercle 
discussed in the description of _Ouranosaurus_ is the same as this ridge in 
_Protohadros_, _Bactrosaurus_, _Telmatosaurus_,
_Probactrosaurus_, and the euhadrosaurs.

MESIODISTAL?

What is mesiodistal?  As in, the height/mesiodistal length ratio of dentary 
crowns?

ACCESSORY RIDGES ON DENTARY TEETH?

How are the secondary ridges distinguished from distal secondary ridges?

HOLLOW SUPRACRANIAL CREST

Is it better to use this as one character, or to split it up into multiple 
characters like this:

35. Nasal participation in the formation of the hollow supracranial crest: < 
50% (0) ~50% (1)
0- Tsintaosaurus [?], Parasaurolophus, Lambeosaurus
1- Corythosaurus, Hypacrosaurus, Olorotitan
n/a - Jinzhousaurus, Bactrosaurus, Hadrosaurines

36. Caudal portion of the prefrontal: perfectly horizontal (0) 
lateroventrally elevated (1)
0- Bactrosaurus, Hadrosaurines, Jinzhousaurus
1- Tsintaosaurus, Jaxartosaurus, Amurosaurus, Parasaurolophus, 
Charonosaurus, Lambeosaurus, Corythosaurus, Hypacrosaurus

37. Lateral side of the squamosal: low (0) elevated (1)
0- Bactrosaurus, Tsintaosaurus, hadrosaurines, Jaxartosaurus, Jinzhousaursu
1- Amurosaurus, Parasaurolophus, Charonosaurus, Lambeosaurus, Corythosaurus, 
Hypacrosaurus

44. Premaxillary lateral process: overlaps prefrontal (0) extends 
posteriorly past prefrontal and dorsally above the skull roof (1)
0- Bactrosaurus, Edmontosaurus, Brachylophosaurus
1- Saurolophus, Parasaurolophus, Corythosaurus

45. Nasal cavity position: anteromedial to orbits (0) diverticulae above 
orbits (1)
0- Bactrosaurus, Edmontosaurus, Saurolophus
1- Olorotitan, Parasaurolophus, Corythosaurus

104. Ventral excavation of nasals: absent (0) present (1)
0- Iguanodon, hadrosaurines
1- Ouranosaurus, lambeosaurines

SUPRAOCCIPITAL
Are the dorso-lateral bosses on the supraoccipital of lambeosaurines and 
_Ouranosaurus_ an enlargement of the saggital nuchal crests on the 
supraoccipital crests of _Iguanodon_ and _Jinzhousaurus_, or are they a 
different structure entirely?



ECTOPTERYGOID ARTICULATIONS

Ectopterygoid articulates with jugal via a short deeply etched groove:  
Zephyrosaurus, Orodromeus, Dryosaurus, Dysalotosaurus

Ectopterygoid articulates with jugal via a rounded, shallow scar:  Iguanodon 
atherfieldensis, Iguanodon bernissartensis, Ouranosaurus, Camptosaurus

I know the ectopterygoid articulates with the jugal in Fukuisaurus, 
Altirhinus, Eolambia, & Protohadros but I do not know the condition of the 
contact.

Ectopterygoid articulates with weak facet on lateral surface of maxilla: 
Bactrosaurus

Ectopterygoid articulates with strong facet on lateral surface of maxilla: 
Tsintaosaurus, Amurosauurs, Charonosaurus, Parasaurolophus, Lambeosaurus, 
Hypacrosaurus, Olorotitan, Edmontosaurus, Brachylophosaurus, Saurolophus

I know the ectopterygoid articulates with the maxilla in Telmatosaurus and 
Probactrosaurus but I do not know the condition of the contact.

I do not know the condition at all in the following taxa:  Agilisaurus, 
Lurdusaurus, Jaxartosaurus, Jinzhousaurus, Scutellosaurus, Hypsilophodon, 
Yandusaurus, Othnielia, Thescelosaurus, Heterodontosaurus, Gasparinisaura, 
Parksosaurus, Tenontosaurus, Rhabdodon, Bugenasaura, Lesothosaurus

The final part is because the relevant material is uncollected or because I 
simply can't seem to find any published information on it, but I'm not sure 
what it is for each taxon.  I know there should be data on _Hypsilophodon_, 
but I don't understand why there isn't any published, as far as I can find.


Any advice or help would be of great aid! :-)

nick gardner
 = paleoartist
 = paleogeek

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