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Czatkobatrachus polonicus
Taxonomy
Czatkobatrachus polonicus was named by Evans and Borsuk-Bialynicka (1998). Its type specimen is ZPal Ab.IV/7, a limb element (partial right ilium), and it is a 3D body fossil. Its type locality is Czatkowice 1 quarry, which is in an Olenekian fissure fill limestone/limestone in Poland. It is the type species of Czatkobatrachus.
Synonymy list
| Year | Name and author |
|---|---|
| 1998 | Czatkobatrachus polonicus Evans and Borsuk-Bialynicka p. 574 figs. 1-3 |
| 2009 | Czatkobatrachus polonicus Evans and Borsuk−Białynicka p. 81 |
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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.
†Czatkobatrachus polonicus Evans and Borsuk-Bialynicka 1998
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. E. Evans and M. Borsuk−Białynicka 2009 | Small stem−frog (less than 50 mm snout−vent length) that resembles Triadobatrachus and all other salientians in having an anteriorly extended iliac shaft. It resembles Triadobatrachus and differs from crown−group anurans in retaining relatively long neural arches, unfused epipodials, a series of unfused caudal vertebrae instead of an urostyle (Lynch 1973; Trueb 1973; Sanchiz 1998), a scapulocoracoid that is a single ossification, and an ilium with very strong dorsal prominence and a slender elongate shaft, rounded in cross−section. It differs from Triadobatrachus in having a long slender scapular blade (short and broad in Triadobatrachus), in having a single atlas ossification with no trace of rib facets (bipartite atlas with a rib processes reported in Triadobatrachus by Rage and Roček 1989, and Roček and Rage 2000, but see below for different view), in having a higher level of ossification, long fused posterior transverse processes and sacral ribs, fully ossified components in elbow joint, ischium fused to ilium (the last feature unique within the Salientia; Roček, personal communication 2007) despite its much smaller size, and in having longer, more slender limbs. As reconstructed, the ilio−sacral joint of Czatkobatrachus has a morphology quite distinct from that of Triadobatrachus, in that the sacral rib is short and fused to the vertebral centrum (rather than free and posteriorly elongate), and has an expanded distal end that is both dorsoventrally and anteroposteriorly bifurcate, with a posterior notch and groove. Czatkobatrachus also differs from Triadobatrachus and resembles many crown−group frogs in having a fully ossified, capitate eminence (eminentia capitata) that equals or exceeds 60% of the width of the distal end of humerus, and asymmetrical epicondyles (ulnar epicondyle larger). It differs from crown−group frogs in having the anterior margin of atlas pedicel notched for the exit of the first spinal nerve and spinal nerve notches or foramina in some posterior vertebrae, and in retaining an ossified remnant of the pubis, fused to the body of the pelvis and perforated by an obturator canal. |