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Jaculinykus yaruui
Taxonomy
Jaculinykus yaruui was named by Kubo et al. (2023). Its type specimen is MPC-D 100/209, a partial skeleton, and it is a 3D body fossil. Its type locality is Red Walls, Nemegt, which is in a Campanian/Campanian eolian sandstone in the Baruungoyot Formation of Mongolia. It is the type species of Jaculinykus.
Synonymy list
| Year | Name and author |
|---|---|
| 2023 | Jaculinykus yaruui Kubo et al. |
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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.
†Jaculinykus yaruui Kubo et al. 2023
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| K. Kubo et al. 2023 | Jaculinykus differs from all other alvarezsaurs in having a dorsoventrally high narial opening of the premaxilla, medially curved parasagittal crest on the parietal, slender and nearly straight dentaries, triangular-shaped deltopectoral crest being separated from the humeral head by a notch, strong medial tab of metacarpal I, weakly developed proximodorsal process of phalanx I-1, robust medial condyle of the tibia relative to the fibular condyle, and sharply indented base of the ascending process of astragalus. Jaculinykus is also distinguished from other alvarezsaurs by the unique combination of the following characters: slender ischial shaft relative to the pubic shaft, an open popliteal fossa of the femur, and prominent external projection of the ectocondylar tuber of the femur. It differs from the hypothesized sister taxon Shuvuuia deserti in possessing the following additional features: the deltopectoral crest being separated from the humeral head by a notch; the absence of the third manual digit. It also differs from stratigraphically same or older (the Baruungoyot Formation) alvarezsaurid, Ondogurvel alifanovi, from the same locality (the Nemegt locality) in possessing the following features in the manus: the metacarpal II being not incorporated into the fused metacarpal element, a sharply truncated metacarpal III, and a weakly-developed proximodorsal process of phalanx I-1. It differs from Parvicursor remotus of the Baruungoyot Formation in possessing the following features: a straight posterior margin of the medial distal condyle of femur, ectocondylar tuber on the lateral distal condyle not extended posteriorly beyond the level of the medial condyle, and robust and rounded medial condyle of the proximal end of tibia. Differs from Ceratonykus oculatus of the Baruungoyot Formation in possessing the following features: the ratio of the frontal length to the transverse width in Jaculinykus yaruui being smaller (1.7) than that in Ceratonykus oculatus (4.0); a well-developed cnemial crest of the tibia. It differs from Khulsanurus magnificus of the Baruungoyot Formation in possessing the following features: the presence of pleurocoels and epipophyses on the cervicals, dorsoventrally thin and subcircular in cross-section transverse process of the anterior caudals, and a notch between the humeral head and deltopectoral crest. It differs from stratigraphically younger (the Nemegt Formation) alvarezsaurid Mononykus olecranus in possessing the following features: the femoral head being more robust in Jaculinykus yaruui than that in Mononykus olecranus, a popliteal fossa on the distal end of the femur opening distally, and an anteriorly oriented cnemial crest of the tibia. It differs from Nemegtonykus citus of the Nemegt Formation in possessing the following features: the scapula unfused to the coracoid, a strongly curved femoral shaft, and the presence of an ectocondylar tuber on the femoral distal condyle. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Benton 1983, Marsh 1875 | |||||
Age range: base of the Middle Campanian to the top of the Late/Upper Campanian or 83.50000 to 70.60000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Campanian - Late/Upper Campanian | Mongolia (Omnogov) | Jaculinykus yaruui (type locality: 174155) |