Open Paleo

Campylodoniscus

Kuhn, 1961 kam-PIE-low-doh-NISS-kus

Diminutive form of Campylodon; from Greek kampylos (καμπυλος) meaning 'bent/curved' and Greek odon (ὀδών) meaning 'tooth'. Full meaning: 'little bent tooth'.

100.5–89.8 million years ago Cenomanian–Turonian, Late Cretaceous
Late Cretaceous stages

Campylodoniscus is a genus of titanosaur sauropod dinosaur from the Late Cretaceous Period of what is now Argentina.

Diagnosis

  1. Maxilla with exactly 7 alveoli only; 2.5 cm of bone without alveoli behind last alveolus
  2. Alveolar diameters decrease posteriorly from 13-14 mm to 7 mm; labial border slopes deeply, lingual much higher
  3. Maxilla height 10.5 cm above first alveolus, decreasing posteriorly; slightly convex longitudinally
  4. Large oval vascular perforation on outer surface above first alveolus, followed by five more openings of decreasing size
  5. Anterior apophysis directed forward, deeply and concavely excavated, with serrated suture for premaxilla articulation
  6. Dental crown intermediate between spatulate Camarasaurus and styliform Diplodocus; surface with peach-stone-like roughnesses

Species

Campylodoniscus ameghinoi (Huene, 1929)

Type species

First named as Campylodon ameghinoi

Named for Florentino Ameghino, the renowned Argentine naturalist and paleontologist.

Holotype
MACN A-IOR63 , Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia’
Material
Left maxilla with 7 alveoli; one alveolus contains complete tooth and replacement tooth. Anterior alveolus 10 mm diameter, last 7 mm, spacing 5 mm.
Horizon
Chubut Group, Cenomanian–Turonian, Late Cretaceous , 100.5–89.8 million years ago
Locality
western side of the Sierra de San Bernardo, Chubut, Argentina

Synonyms of the genus

Name Type Reason
Campylodon preoccupied Name preoccupied by Campylodon (Pisces).

References

  1. Huene, F. V. (1929). Los saurisquios y ornitisquios del Cretáceo Argentino [The Saurischians and Ornithischians of the Argentine Cretaceous]. Anales del Museo de La Plata, series 2 3: 1-196.

    In Spanish. Original description of the material as Campylodon ameghinoi; the genus name Campylodon was later found to be preoccupied and replaced with Campylodoniscus by Kuhn (1961).

    huene1929a
  2. Kuhn, O. (1961). Die Familien der rezenten und fossilen Amphibien und Reptilien [The families of recent and fossil amphibians and reptiles]. Die Familien der rezenten und fossilen Amphibien und Reptilien. Meisenbach, Bamberg.

    In German. Replacement name Campylodoniscus erected for the preoccupied Campylodon Huene, 1929.

    kuhn1961a