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ISCHIOCERATOPS

a plant-eating leptoceratopsid dinosaur from the Late Cretaceous of China.
Pronunciation: ISS-key-o-SEH-ruh-tops
Meaning: Ischium horned face
Author/s: He, Makovicky, Wang, et al. (2015)
Synonyms: None known
First Discovery: Shandong Province, China
Chart Position: 736

Ischioceratops zhuchengensis

Ischioceratops is a member of Leptoceratopsidae—a sub-family amongst the frilled and horn-faced herbivores known as ceratopsids. Funnily enough, they lack horned faces and sport only the faintest whiff of a frill. They do, however, possess very robust jaws equipped with highly specialized large teeth, probably for dealing with tough vegetation.

Behind Zhuchengceratops inexpectus, Ischioceratops is the second leptoceratopsid from the Kugou locality of Zhucheng's Wangshi Group. Although lauded as choc-o-bloc with unique features of the hip, Ischioceratops and Zhuchengceratops currently lack any overlapping parts that are directly compareable. But if a specimen turns up in this area that marries the "unique" features of both species then the latter will be sunk as a junior synonym because the former was named first.

Ischioceratops has nine hip vertebrae, which is more than the going rate of 6-8 for basal (non-ceratopsid) ceratopsians but one less than found in advanced ceratopsids. The ischium bone of its hip is unique among known dinosaurs in having a robust shaft shaped something like a recurved bow, that flares from both ends towards the midpoint, forming what would be the bow handle. This raised and thickened area, called an "Obturator process", sports an oval pit that acted as an anchor point for the thigh muscle. The foot of its bowed ischiadic shaft forms an axehead-shaped expansion.

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(Ischium horned face from Zhucheng)Etymology
Ischioceratops is derived from "ischium" (a hip bone, the features of which are unique in Ischioceratops) and the Greek "ceras" (horned) and "-ops" (face).
The species epithet, zhuchengensis, means "from Zhucheng" in Latin.
Discovery
The remains of Ischioceratops were discovered at Kugou Quarry in the Xingezhuang Formation (Wangshi Group), Zhucheng, Shandong Province, China.
The holotype (ZCDM V0016) is an incomplete, partially articulated specimen, comprising the entire sacrum, a few ossified tendons, both halves of the pelvis, a series of fifteen caudal (tail) vertebrae, and the right femur (thigh), tibia (shin) and fibula (calf).
Estimations
Timeline:
Era: Mesozoic
Epoch: Late Cretaceous
Stage: Campanian
Age range: 84-71 mya
Stats:
Est. max. length: 2.4 meters
Est. max. hip height: 0.8 meters
Est. max. weight: 100 Kg
Diet: Herbivore
ischioceratops-size
References
• He Y, Makovicky PJ, Wang K, Chen S, Sullivan C, Han F & Xu Xing (2015) "A New Leptoceratopsid (Ornithischia, Ceratopsia) with a Unique Ischium from the Upper Cretaceous of Shandong Province, China". PLoS ONE 10(12): e0144148. doi:10.1371/journal.pone.0144148
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To cite this page:
Atkinson, L. "ISCHIOCERATOPS :: from DinoChecker's dinosaur archive".
›. Web access: 27th Apr 2017.
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