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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Eousdryosaurus nanohallucis
Taxonomy
Eousdryosaurus nanohallucis was named by Escaso et al. (2014). Its type specimen is SHN(JJS)-170, a partial skeleton (a partial skeleton that includes nine articulated proximal caudal vertebrae; the left ilium; right femur; proximal left femur; left tibia; left fibula; left ast), and it is a 3D body fossil. Its type locality is Porto das Barcas (PB), which is in a Kimmeridgian/Tithonian marine mudstone/sandstone in the Lourinhã Formation of Portugal. It is the type species of Eousdryosaurus.
Synonymy list
| Year | Name and author |
|---|---|
| 2014 | Eousdryosaurus nanohallucis Escaso et al. p. 1103 |
| 2016 | Eousdryosaurus nanohallucis Hübner p. 324 |
| 2018 | Eousdryosaurus nanohallucis Herne et al. p. 15 |
| 2018 | Eousdryosaurus nanohallucis Madzia et al. p. 969 |
| 2019 | Eousdryosaurus nanohallucis Herne et al. p. 579 |
| 2019 | Eousdryosaurus nanohallucis Párraga and Prieto-Márquez p. 254 |
| 2020 | Eousdryosaurus nanohallucis Castanera et al. p. 410 |
| 2020 | Eousdryosaurus nanohallucis Dieudonné et al. |
| 2020 | Eousdryosaurus nanohallucis Malafaia et al. p. 6 |
| 2020 | Eousdryosaurus nanohallucis Rotatori et al. p. 36 |
| 2021 | Eousdryosaurus nanohallucis Sánchez-Fenollosa et al. p. 54 |
| 2021 | Eousdryosaurus nanohallucis Verdú et al. p. 4 |
| 2022 | Eousdryosaurus nanohallucis Rotatori et al. p. 139 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Eousdryosaurus nanohallucis Escaso et al. 2014
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. Escaso et al. 2014 | A dryosaurid ornithopod diagnosed by the following
autapomorphies: proximal-most caudal neural spines with a small, thorn-like anterior process; an extremely wide ilium brevis shelf that is ventromedially directed; an astragalus with a prominent triangular posteromedial process that obscures the anterior surface; a calcaneum with a strong proximal projection that has a rounded dorsal margin; a medial distal tarsal composed by sutured, but not fused, distal tarsals 1 and 2; metatarsal V with a blunt eminence at midshaft that breaks in slope to its distal end; and a phalangeal formula for the pes of 1-3-4-5-0, in which the ungual of digit I is uniquely extremely reduced, dorsoventrally flattened, elongated, and pointed. Moreover, Eousdryosaurus differs from other dryosaurids in the following unique combination of characters: the cranial trochanter of the femur is separated from the greater trochanter by a deep cleft, as in Callovosaurus, Dryosaurus, Dysalotosaurus, Elrhazosaurus, and Valdosaurus; the dorsal margin of the greater trochanter of the femur is situated at the level of the dorsal border of the cranial trochanter, as in Dryosaurus, Dysalotosaurus, and Valdosaurus; an insertion scar for the M. caudifemoralis longus on the femur is separated from the fourth trochanter, as in Callovosaurus, Dryosaurus, Dysalotosaurus, Elrhazosaurus, and Kangnasaurus; the femoral anterior intercondylar groove is broad and shallow, as in Dryosaurus, Kangnasaurus, and Callovosaurus; the dorsal surface of the proximal end of the fibula is straight and anteroposteriorly inclined in lateral view, as in Dryosaurus and Dysalotosaurus; the fibular facet of the calcaneum is situated at the same level as the lateral malleolus of the tibia, as in Dryosaurus, Dysalotosaurus, and Kangnasaurus; the absence of a distinct notch in the posterolateral corner of metatarsal III, as in Dryosaurus and Kangnasaurus; the absence of well-defined anteromedial and posteromedial processes on the proximal end of metatarsal IV, as in Dryosaurus and Kangnasaurus; the absence of a ventromedial process at the proximal end of phalanx II-1, as in Dryosaurus and Dysalotosaurus; and the distinct ventromedial process at the proximal end of phalanx IV-1, as in Dryosaurus and Dysalotosaurus. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Marsh 1875, Kiessling 2004, Benton 1983 | |||||
Age range: base of the Late/Upper Kimmeridgian to the top of the Early/Lower Tithonian or 152.21000 to 145.06000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Kimmeridgian - Early/Lower Tithonian | Portugal (Centro) | Eousdryosaurus nanohallucis (type locality: 163143) |