A new frog (Amphibia: Anura) from the Lower Cretaceous of western Liaoning, China

Gao, Ke‐Qin; Chen, Shuihua

doi:10.1016/j.cretres.2004.06.011

Cited by 30 publications

(28 citation statements)

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“…This set of characters is also seen in the most primitive living frogs Ascaphus + Leiopelma, all Early Cretaceous fossil discoglossids and pipoids from Spain (Báez and Sanchiz, 2007;Báez, 2013), and the Early Cretaceous fossil neobatrachians from Brazil (Báez et al, 2009). All the three previously known Jehol frogs are characterized by moderately expanded and hatchet-shaped sacral diapophysis, bicondylar sacral-urostyle articulation, and smooth ilia and urostyle (Gao and Wang, 2001;Gao and Chen, 2004). In sharp contrast, the new frog Genibatrachus displays a nonexpanded sacral diapophysis, although it retains a smooth dorsal surface in ilia and urostyle.…”

Section: Discussion On Evolution Of Early Frog Body Planmentioning

confidence: 82%

“…The Jehol frogs Yizhoubatrachus and Callobatrachus were originally reported to have opisthocoelous centra (Gao and Wang, 2001;Gao and Chen, 2004), whereas Mesophryne express procoelous centra (Gao and Wang, 2001). Dong et al (2013) considered all these three Jehol frogs to have amphicoelous centra, but no clear evidence supports such speculations.…”

Section: Discussion On Evolution Of Early Frog Body Planmentioning

confidence: 85%

“…Among the Early Cretaceous frogs, the European Neusibatrachus probably has four pairs of free ribs (Báez and Sanchiz, 2007), whereas Eodiscoglossus from Spain and all frogs previously known from the Jehol Biota of China have three pairs of free ribs associated with the trunk vertebrae II-IV (Sanchiz, 1998;Gao and Wang, 2001;Gao and Chen, 2004). Neogene Palaeobatrachus from Central Europe has five pairs of free ribs during development, but these are fused with the transverse processes of presacral vertebrae II-VI in adults (Špinar, 1972;Roček, 2003).…”

Section: Discussion On Evolution Of Early Frog Body Planmentioning

confidence: 99%

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A New Crown-Group Frog (Amphibia: Anura) from the Early Cretaceous of Northeastern Inner Mongolia, China

Gao

Chen

2017

American Museum Novitates

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Based on 12 well-preserved skeletons of postmetamorphic individuals, a new crown-group frog taxon is named and described from the Lower Cretaceous Guanghua (upper part of Longjiang) Formation (stratigraphic equivalent of the world-famed Yixian Formation) exposed in Dayangshu Basin, Hulunbuir, in the far northeast of Inner Mongolia, China. The new taxon, Genibatrachus baoshanensis, documents another Early Cretaceous anuran having reduction of the presacral vertebrae to eight in number, similar to several frog taxa of roughly the same age from Spain and Brazil. The new frog also displays several features that are ontogenetically and phylogenetically informative, including ontogenetic fusion of the palatine to the sphenethmoid, and ontogenetic fusion of ribs to the diapophyses of the posterior trunk vertebrae. In addition, the new discovery extends the geographic range of Early Cretaceous frogs of the Jehol Biota northward to near the 50th parallel north in East Asia.

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Section: Discussion On Evolution Of Early Frog Body Planmentioning

confidence: 82%

Section: Discussion On Evolution Of Early Frog Body Planmentioning

confidence: 85%

Section: Discussion On Evolution Of Early Frog Body Planmentioning

confidence: 99%

See 1 more Smart Citation

A New Crown-Group Frog (Amphibia: Anura) from the Early Cretaceous of Northeastern Inner Mongolia, China

Gao

Chen

2017

American Museum Novitates

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“…Amphibians are an important component of the Jehol Biota, with 4 urodele [7] and 5 anuran taxa having been formally reported [8]–[12]. The anurans include Liaobatrachus grabaui Ji and Ji 1998 [8], Callobatrachus sanyanensis Wang and Gao 1999 [9], Mesophryne beipiaoensis Gao and Wang 2001 [10], Dalianbatrachus mengi Gao and Liu 2004 [11], and Yizhoubatrachus macilentus Gao and Chen 2004 [12].…”

Section: Introductionmentioning

confidence: 99%

“…The anurans include Liaobatrachus grabaui Ji and Ji 1998 [8], Callobatrachus sanyanensis Wang and Gao 1999 [9], Mesophryne beipiaoensis Gao and Wang 2001 [10], Dalianbatrachus mengi Gao and Liu 2004 [11], and Yizhoubatrachus macilentus Gao and Chen 2004 [12]. Because each taxon was based on a single specimen, some anatomical characters were ambiguous or even incorrectly interpreted.…”

Section: Introductionmentioning

confidence: 99%

Anurans from the Lower Cretaceous Jehol Group of Western Liaoning, China

et al. 2013

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BackgroundTo date, the Lower Cretaceous Jehol Group of western Liaoning, China has yielded five monotypic genera of anurans, including Liaobatrachus grabaui, Callobatrachus sanyanensis, Mesophryne beipiaoensis, Dalianbatrachus mengi, and Yizhoubatrachus macilentus. However, the validity and distinctness of these taxa have been questioned.Methodology/Principal FindingWe provide a comprehensive analysis of the Jehol frogs that includes a re-examination of the published taxa as well as an examination of a number of new specimens that have been collected over the past 10 years. The results show that the five previously named taxa can be referred to three species of one genus–Liaobatrachus grabaui, L. beipiaoensis comb. nov. and L. macilentus comb. nov.. The diagnosis of Liaobatrachus is revised, and a new diagnosis is provided for each species of this genus. We also establish Liaobatrachus zhaoi sp. nov., on the basis of a dozen well-preserved specimens from a new locality. This taxon is distinguished by a unique combination of characteristics, including relatively long hind limbs, a rounded rather than triangular acetabulum, and a gradually-tapering cultriform process of the parasphenoid. In addition, an unnamed frog from a higher horizon, which has narrow sacral diapophyses and particularly long legs, is different from Liaobatrachus and represents another form of anuran in the Jehol Biota.Conclusion/SignificanceComparisons with other Mesozoic and extant anurans and the primary phylogenetic analysis both suggest that Liaobatrachus is a member of the anuran crown-group and forms a polytomy with leiopelmatids (Ascaphus and Leiopelma) and the remaining crown-group anurans (Lalagobatrachia).

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The evolution of jumping in frogs: Morphological evidence for the basal anuran locomotor condition and the radiation of locomotor systems in crown group anurans

Reilly

Jorgensen

2010

Journal of Morphology

147

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Our understanding of the evolution of frog locomotion follows from the work of Emerson in which anurans are proposed to possess one of three different iliosacral configurations: 1) a lateral-bending system found in walking and hopping frogs; 2) a fore-aft sliding mechanism found in several locomotor modes; and 3) a sagittal-hinge-type pelvis posited to be related to long-distance jumping performance. The most basal living (Ascaphus) and fossil (Prosalirus) frogs are described as sagittal-hinge pelvic types, and it has been proposed that long-distance jumping with a sagittal-hinge pelvis arose early in frog evolution. We revisited osteological traits of the pelvic region to conduct a phylogenetic analysis of the relationships between pelvic systems and locomotor modes in frogs. Using two of Emerson's diagnostic traits from the sacrum and ilium and two new traits from the urostyle, we resampled the taxa originally studied by Emerson and key paleotaxa and conducted an analysis of ancestral-character state evolution in relation to locomotor mode. We present a new pattern for the evolution of pelvic systems and locomotor modes in frogs. Character analysis shows that the lateral-bender, walker/hopper condition is both basal and generally conserved across the Anura. Long-distance jumping frogs do not appear until well within the Neobatrachia. The sagittal-hinge morphology is correlated with long-distance jumping in terrestrial frogs; however, it evolved convergently multiple times in crown group anurans with the same four pelvic traits described herein. Arboreal jumping has appeared in multiple crown lineages as well, but with divergent patterns of evolution involving each of the three pelvic types. The fore-aft slider morph appears independently in three different locomotor modes and, thus, is a more complex system than previously thought. Finally, it appears that the advent of a bicondylar sacro-urostylic articulation was originally related to providing axial rigidity to lateral-bending behaviors rather than sagittal bending.

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A new frog (Amphibia: Anura) from the Lower Cretaceous of western Liaoning, China

Cited by 30 publications

References 5 publications

A New Crown-Group Frog (Amphibia: Anura) from the Early Cretaceous of Northeastern Inner Mongolia, China

A New Crown-Group Frog (Amphibia: Anura) from the Early Cretaceous of Northeastern Inner Mongolia, China

Anurans from the Lower Cretaceous Jehol Group of Western Liaoning, China

The evolution of jumping in frogs: Morphological evidence for the basal anuran locomotor condition and the radiation of locomotor systems in crown group anurans

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