31. Due to the limited amount of material, it has been considered a " nomen dubium ". 32. This animal is only known from these teeth, and is usually considered a " nomen dubium ". 33. However, it was later dismissed as a " nomen dubium " based on non-diagnostic remains. 34. Later researchers considered " Altispinax " a " nomen dubium " because the single tooth was undiagnostic. 35. Because the known remains are so poor, the genus is now regarded as a " nomen dubium ". 36. Because the fragmentary remains provide little diagnostic value, the genus is now considered a " nomen dubium ". 37. Gervais 1872 was previously considered a synonym, but it has been recently considered a " nomen dubium ". 38. Subsequent authors have agreed with this assessment and have considered " Antrodemus " a " nomen dubium ". 39. A revision in 2010 by Philip Mannion concluded that " Bothriospondylus " is a " nomen dubium ". 40. The authors considered " Arstanosaurus akkurganensis " a " nomen dubium " and did not refer its material.
