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Hensonbatrachus kermiti
Taxonomy
Hensonbatrachus kermiti was named by Gardner and Brinkman (2015). Its type specimen is UALVP 40167, a maxilla (Partial right maxilla), and it is a 3D body fossil. Its type locality is Irvine microvertebrate site, which is in a Judithian terrestrial horizon in the Dinosaur Park Formation of Canada. It is the type species of Hensonbatrachus.
Synonymy list
| Year | Name and author |
|---|---|
| 2015 | Hensonbatrachus kermiti Gardner and Brinkman p. 48 |
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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.
†Hensonbatrachus kermiti Gardner and Brinkman 2015
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. D. Gardner and D. B. Brinkman 2015 | Differs from other anurans, especially those known from the North American Cretaceous, by a unique suite of features. Body size: moderate (i.e., estimated snout–vent length of 75–115 mm). Cranial ornament: pre- maxilla is unornamented, whereas maxilla, nasal, squamosal, and frontoparietal are broadly ornamented externally with pit-and-ridge style ornament consisting of moderately deep, irregular-shaped pits and short grooves enclosed by moderately tall, thick, and vermiform ridges. Dentition: maxilla and premaxilla bear teeth; maxillary teeth (no intact examples known for premaxilla) relatively short, weakly pedicellate, and labiolingually bicuspid with disc-shaped cuspules. Maxilla: robust in build; pre- and postorbital regions (i.e., processus frontalis and processus zygomatico-maxillaris, respectively) relatively tall and similar in height, suborbital region relatively deep between margo orbitalis and dorsal surface of lamina horizontalis, and margo orbitalis moderately concave; processus palatinus weakly developed as a narrow, tapered prong that extends dorsoanteriorly and barely projects past dorsal edge of processus frontalis; ductus nasolacrimalis extends as an enclosed canal through base of processus palatinus and as a dorsally open groove along dorsal surface of margo orbitalis; dorsal edge of processus zygomatico-maxillaris labiolingually thin and smooth with no indication (i.e., a sutural surface) of direct bony contact with squamosal; lingual surfaces of processus zygomatico-maxillaris and of pars facialis below posterior portion of margo orbitalis roughened, presumably for ligamentous or direct bony contact with pterygoid or ligamentous contact with squamosal; variable presence of one or more foramina in labial surface of maxillary pars facialis below posterior part of margo orbitalis that connect with canal extending through bone to open in lingual surface of suborbital region; lamina horizontalis a prominent ledge that is moderately deep, lingually wide, and approximately triangular in cross section, with lingual surface flattened and facing ventrolingually, ventral surface narrow and dorsally concave, and dorsal surface shallowly concave to nearly flat; and processus pterygoideus weakly developed as a small, flattened, scoop-like process that barely projects lingually. Premaxilla: bears elongate processus lateralis. Squamosal: lamella alaris expanded into broad, externally ornamented plate that covers most of lateral surface of bone, except for distal end of processus posterolateralis, approximately C-shaped in lateral outline, with deeply concave posterior margin and smooth dorsal mar- gin indicating no direct bony contact with frontoparietal; processus zygomaticus absent and no sutural surface present along ventral margin of bone for direct bony contact with maxilla; and processus posterolateralis a stout prong. Nasal: moderate in size and subtriangular or sickle-shaped in outline. Frontoparietal: bilaterally paired and in weakly sutured medial contact at least posteriorly; moderately narrow in dorsal or ventral outline; tectum supraorbitale present; processus paraoccipitalis posteriorly short and triangular in dorsal or ventral outline; and ventral surface bears anterior and posterior incrassations, both developed as flattened bony patches on median portion of bone and continuous across skull midline, with posterior incrassation subcircular in ventral outline and anterior incrassation more elongate. Ilium: iliac portion of acetabular surface subtriangular in lateral outline and its borders fully contained within dorsal, anterior, and ventral boundaries of acetabular region; dorsal prominence a raised, mediolaterally compressed ridge along dorsal surface of acetabular region and bearing at its anterior end a low, knob-like dorsal tubercle with a flattened top; short oblique groove present and accompanied by low medial crest; iliac shaft slightly compressed mediolaterally, with shallow trough extending along long axis on both lateral and medial surfaces; and no dorsal crest or inter-iliac tubercle. |
Measurements
No measurements are available
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| Source: subo = suborder, c = class, subp = subphylum, uc = unranked clade | |||||
| References: Uhen 2004, Carroll 1988, Hendy et al. 2009 | |||||
Age range: Judithian or 83.50000 to 70.60000 Ma
Collections (10 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Judithian | Canada (Alberta) | Hensonbatrachus kermiti (type locality: 14463) | |
| Late/Upper Campanian | Canada (Alberta) | Hensonbatrachus kermiti (22697 45264 47816) | |
| Middle Campanian | Canada (Alberta) | Hensonbatrachus kermiti (47794 47795 172610) | |
| Middle Campanian - Late/Upper Campanian | Canada (Alberta) | Hensonbatrachus kermiti (172611 172612) | |
| Middle Campanian - Late/Upper Campanian | USA (Montana) | Hensonbatrachus kermiti (14446) |