[D] Ferganocephale adenticulatum [sG] [T]
Describer
Averianov, Martin, and Bakirov, 2005
Time
Jurassic Middle Callovian
Classification
Ornithischia Genasauria Cerapoda Marginocephalia Pachycephalosauria Pachycephalosauridae
Diet
Herbivore
Fossilsite
Balabansai Formation, (Balabansai Svita) northern Fergana Valley, Kirgizia
Info
Genus - Typespecies
Tooth taxon The oldest representative of the group and extends its known history by 10-20 myr. The teeth are unusual for not having marginal denticles. One of the teeth was originally tentatively considered stegosaurian.
Averianov, A. O., Martin, T., and Bakirov, A. A. (2005) Pterosaur and dinosaur remains from the Middle Jurassic Balabansai Svita in the northern Fergana depression, Kyrgystan (Central Asia): Palaeontology, v. 48, part 1, p. 135-155.
Ferganocephale adenticulatum is the oldest representative of the pachycephalosaurid group and extends its known history by 10–20 myr.
Holotype
ZIN PH 34 ⁄ 42, isolated unworn adult tooth. Referred material. ZIN PH 5 ⁄ 42, possible juvenile tooth. ZIN PH 4, 30–33 ⁄ 42, four isolated adult teeth. Site FTA-30. ZIN PH
Etymology
[Genus] From the Fergana Valley and Greek for head [Species] Greek a, denoting absence, and denticulum, denticle, meaning absence or easy loss of vestigial marginal crown denticles by wear.35 ⁄ 42, isolated heavily worn adult tooth. Site FTA-31. ZIN PH 36 ⁄ 42, isolated adult posterior tooth. Site FBX-23.
Diagnosis
(1) Teeth with both lingual and labial crownsides covered by enamel (–)*; (2) tooth crowns asymmetricalin side view, with one crown side (mesial?) being moreconvex than the opposite side (+)*; (3) main crown ridgepoorly differentiated or not distinguishable (+)**; (4) verticalcrown ridges leading to the marginal denticles veryweak or absent (+)**; (5) marginal crown denticles absentor so small that they are eliminated by the slightest wear(+)**; (6) basal crown cingulum present (+)*; (7) basalcingulum more prominent on one crown side comparedwith the opposite side (on the lingual side in the maxillaryteeth and on the labial side in the mandibular teeth) (+)*;(!["8)"](/"http://www.dinodata.info/Smileys/default/cool.gif" "\"Cool\"")
basal crown cingulum interrupted at the centre of thelabial side in the maxillary teeth and of the lingual side inthe mandibular teeth (+)**; (9) vertical wrinkled ornamentationcould be present on the less concave crownside, adjacent to the basal cingulum interruption, at leastin some teeth (+)**; (10) dentition monognathically heterodont,with the posterior teeth having lower and moreasymmetrical crowns than the anterior teeth (+)* (‘–’primitive character, ‘+’ derived character, * character typicalfor Pachycephalosauria, ** autapomorphy).
Averianov, Martin, and Bakirov, 2005
Time
Jurassic Middle Callovian
Classification
Ornithischia Genasauria Cerapoda Marginocephalia Pachycephalosauria Pachycephalosauridae
Diet
Herbivore
Fossilsite
Balabansai Formation, (Balabansai Svita) northern Fergana Valley, Kirgizia
Info
Genus - Typespecies
Tooth taxon The oldest representative of the group and extends its known history by 10-20 myr. The teeth are unusual for not having marginal denticles. One of the teeth was originally tentatively considered stegosaurian.
Averianov, A. O., Martin, T., and Bakirov, A. A. (2005) Pterosaur and dinosaur remains from the Middle Jurassic Balabansai Svita in the northern Fergana depression, Kyrgystan (Central Asia): Palaeontology, v. 48, part 1, p. 135-155.
Ferganocephale adenticulatum is the oldest representative of the pachycephalosaurid group and extends its known history by 10–20 myr.
Holotype
ZIN PH 34 ⁄ 42, isolated unworn adult tooth. Referred material. ZIN PH 5 ⁄ 42, possible juvenile tooth. ZIN PH 4, 30–33 ⁄ 42, four isolated adult teeth. Site FTA-30. ZIN PH
Etymology
[Genus] From the Fergana Valley and Greek for head [Species] Greek a, denoting absence, and denticulum, denticle, meaning absence or easy loss of vestigial marginal crown denticles by wear.35 ⁄ 42, isolated heavily worn adult tooth. Site FTA-31. ZIN PH 36 ⁄ 42, isolated adult posterior tooth. Site FBX-23.
Diagnosis
(1) Teeth with both lingual and labial crownsides covered by enamel (–)*; (2) tooth crowns asymmetricalin side view, with one crown side (mesial?) being moreconvex than the opposite side (+)*; (3) main crown ridgepoorly differentiated or not distinguishable (+)**; (4) verticalcrown ridges leading to the marginal denticles veryweak or absent (+)**; (5) marginal crown denticles absentor so small that they are eliminated by the slightest wear(+)**; (6) basal crown cingulum present (+)*; (7) basalcingulum more prominent on one crown side comparedwith the opposite side (on the lingual side in the maxillaryteeth and on the labial side in the mandibular teeth) (+)*;(
basal crown cingulum interrupted at the centre of thelabial side in the maxillary teeth and of the lingual side inthe mandibular teeth (+)**; (9) vertical wrinkled ornamentationcould be present on the less concave crownside, adjacent to the basal cingulum interruption, at leastin some teeth (+)**; (10) dentition monognathically heterodont,with the posterior teeth having lower and moreasymmetrical crowns than the anterior teeth (+)* (‘–’primitive character, ‘+’ derived character, * character typicalfor Pachycephalosauria, ** autapomorphy).