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Taxonomy
Wyomylus was named by Cassiliano (2008). Its type is Wyomylus whitei. It was considered monophyletic by Cassiliano (2008).
It was assigned to Stenomylini by Cassiliano (2008).
It was assigned to Stenomylini by Cassiliano (2008).
Species
W. whitei (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2008 | Wyomylus Cassiliano p. 43 |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. L. Cassiliano 2008 | Wyomylus differs from Pseudolabis and Miotylopus in possessing longer premaxillae that taper rapidly posterodorsally and end above the middle of M3; a narial opening that ends above P4 or M1; anteromaxillary fossae that are deeper, set lower on the maxillae, have better defined borders, form a shelf over P1–2, and extend farther posteriorly; preor- bital fossae; more posteriorly placed orbits; weak tem- poral and lambdoidal crests; no sagittal crest; later- ally compressed auditory bullae; ventrally elongated paroccipital processes that extend well below the level of the tympanic bullae; bases of external pterygoid processes close together; distinct internal pterygoid processes; anterior infraorbital foramina above the anterior lobe of M2; vestigial P1 and P2; morpholog- ically simple P2; small and morphologically simple P3; P4 small and morphologically not as complex; M1 smaller relative to M2–3, lacks a mesostyle, and lacks well-developed labial ribs on the paracone and metacone; M2–3 transversely narrower, more antero- posteriorly elongated, more hypsodont, lacks labial ribs on the paracone and metacone, shallower ento- flexus, and lacks a mesostyle; M3 with a distinct posterior heel; dentary ramus deep under m3; small p3–4; m1 smaller relative to m2–3; m2–3 antero- posteriorly longer, transversely narrower, more hyp- sodont, a shallower ectoflexid, completely lacking a mesostylid, and lacking lingual ribs on the metaconid and entoconid; metacarpal III and IV trochleae flare laterally; metatarsals III and IV partially fused and shorter; and metatarsal III and IV trochleae flare lat- erally.
Wyomylus differs from Stenomylus (Pegomylus) in its greatly reduced p3–4. Wyomylus is different from Stenomylus (Stenomylus) in the following characters: premaxillae show greater posterodorsal elongation; narial opening placed farther posteriorly; slight pock- eting of the preorbital fossae; more posteriorly placed orbits; tympanic bullae laterally compressed; lambdoi- dal crest does not flare and overhang the occipital plate; possession of internal pterygoid processes; anterior infraorbital foramen above M2; P4 smaller relative to the molars; M3 anteroposteriorly longer; m3 hypoco- nulid with fossettid; alar canal of the atlas more medial in position; no intertrochlear ridge on the humerus; and deep intercondyloid fossa on the femur. Wyomylus differs from Blickomylus in its more posteriorly retracted narial opening; unpocketed anteromaxillary fossae; anteromaxillary fossae shorter, smaller, and shallower; possession of preorbital fossae; larger lacrimal vacuities; glenoid fossae anteroposte- riorly shorter; lambdoidal crest reduced and without flare or overhang of the occipital plate; paroccipital processes ventrally elongated to below the level of the tympanic bullae; possession of internal pterygoid pro- cesses; M1–3 not as hypsodont; M3 less anteroposte- riorly elongated; m1–3 not as hypsodont; two-rooted p3; m3 less anteroposteriorly elongated; m3 hypoco- nulid with fossettid; metacarpals III and IV partially fused or not fused; metatarsals III and IV partially fused; and metatarsals III and IV shorter. Wyomylus is differs from Rakomylus in its unpock- eted anteromaxillary fossae; more deeply excavated preorbital fossae; anteromaxillary and preorbital fossae confluent; larger lacrimal vacuities; anteropos- terior dimension of the glenoid fossae shorter than its transverse dimension; lambdoidal crest reduced and without flare or overhang of the occipital plate; paroccipital processes ventrally elongated to below the level of the tympanic bullae; smaller and shallower parasphenoid pit; possession of internal pterygoid processes; retention of P1–P2; p3 larger and double- rooted; m3 hypoconulid with fossettid; metacarpals III and IV partially fused or not fused; metatarsals III and IV partially fused; and metatarsals III and IV longer. |
Measurements
No measurements are available
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| Source: f = family, o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Carroll 1988, Nowak 1999, Nowak 1991, Lillegraven 1979 | |||||
Age range: base of the late Late Barstovian to the top of the early Early Hemphillian or 16.30000 to 4.70000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| late Late Barstovian - early Early Hemphillian | USA (Wyoming) | W. whitei (156736) |