Sarcopterygians: From Lobe-Finned Fishes to the Tetrapod Stem Group

Clack, Jennifer A.; Ahlberg, Per

doi:10.1007/978-3-319-46661-3_3

Cited by 2 publications

(2 citation statements)

References 32 publications

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“…1, Fig. 2A; Clack et al, 2016; Clack and Ahlberg, 2016), suggesting a trade-off between high cranial mobility for suction performance and increased bite force during processing. Despite the loss and fusion of bones in the skull and the long duration of the suction strikes, suction feeding in the South American lungfish ( Lepidosiren paradoxa ) is frequently successful (Bemis and Lauder, 1986).…”

Section: Introductionmentioning

confidence: 98%

Suction feeding of West African lungfish (Protopterus annectens): An XROMM analysis of jaw mechanics, cranial kinesis, and hyoid mobility

Gartner

Whitlow

Laurence-Chasen

et al. 2022

Preprint

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Suction feeding in fishes is characterized by rapid movement of cranial elements, but extant lungfishes (Sarcopterygii: Dipnoi) exhibit a reduced number and mobility of cranial bones relative to actinopterygian fishes. Despite fusion of cranial elements, lungfishes are proficient at suction feeding, though the impacts of novel cranial morphology and reduced cranial kinesis on feeding remain poorly understood. We used X-ray Reconstruction of Moving Morphology (XROMM) to study the kinematics of six mobile skeletal elements (neurocranium, upper jaw, lower jaw, ceratohyal, clavicle, and cranial rib) and two muscles (costoclavicular portion of the hypaxialis and rectus cervicis) during the feeding strikes of West African lungfish (Protopterus annectens). We found that feeding by P. annectens on non-evasive prey is relatively slow, with a mean time to peak gape of 264 ms. Lower jaw depression and clavicular rotation were hinge-like, with one degree of freedom, but the ceratohyals rotated in a complex motion involving depression and long-axis rotation. We quantified the relative contributions to oral cavity volume change (RCVC) and found that oral cavity expansion is driven primarily by ceratohyal and clavicle motion. P. annectens suction feeds relatively slowly but successfully through muscle shortening of hypaxial and rectus cervicis muscles driving extreme hyoid mobility.

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Section: Introductionmentioning

confidence: 98%

Suction feeding of West African lungfish (Protopterus annectens): An XROMM analysis of jaw mechanics, cranial kinesis, and hyoid mobility

Gartner

Whitlow

Laurence-Chasen

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Lungfishes are the closest living relative to tetrapods ( Amemiya et al, 2013 ), making them useful for understanding the traits and behaviors fishes may have employed prior to the water-to-land transition. The overall trend in lungfish skull evolution has been to reduce their skeletal elements and evolve robust jaws to crush their food ( Figs 1 and 2 A; Clack et al, 2016 ; Clack and Ahlberg, 2016 ), suggesting a trade-off between high cranial mobility for suction performance and increased bite force during processing. Despite the loss and fusion of bones in the skull and the long duration of the suction strikes, suction feeding in the South American lungfish ( Lepidosiren paradoxa ) is frequently successful ( Bemis and Lauder, 1986 ).…”

Section: Introductionmentioning

confidence: 99%

Suction feeding of West African lungfish (Protopterus annectens): An XROMM analysis of jaw mechanics, cranial kinesis, and hyoid mobility

et al. 2022

View full text Add to dashboard Cite

Suction feeding in fishes is characterized by rapid cranial movements, but extant lungfishes (Sarcopterygii: Dipnoi) exhibit a reduced number and mobility of cranial bones relative to actinopterygian fishes. Despite fusion of cranial elements, lungfishes are proficient at suction feeding, though the impacts of novel cranial morphology and reduced cranial kinesis on feeding remain poorly understood. We used X-ray Reconstruction of Moving Morphology (XROMM) to study the kinematics of seven mobile skeletal elements (neurocranium, upper jaw, lower jaw, tongue, ceratohyal, clavicle, and cranial rib) and two muscles (costoclavicular portion of the hypaxialis and rectus cervicis) during the feeding strikes of West African lungfish (Protopterus annectens). We found that feeding by P. annectens on non-evasive prey is relatively slow, with a mean time to peak gape of 273 ms. Lower jaw depression and clavicular rotation were hinge-like, with one degree of freedom, but the ceratohyals rotated in a complex motion involving depression and long-axis rotation. We quantified the relative contributions to oral cavity volume change (RCVC) and found that oral cavity expansion is created primarily by ceratohyal and clavicle motion. P. annectens suction feeds relatively slowly but successfully through muscle shortening of hypaxial and rectus cervicis muscles contributing to hyoid mobility.

show abstract

Sarcopterygians: From Lobe-Finned Fishes to the Tetrapod Stem Group

Cited by 2 publications

References 32 publications

Suction feeding of West African lungfish (Protopterus annectens): An XROMM analysis of jaw mechanics, cranial kinesis, and hyoid mobility

Suction feeding of West African lungfish (Protopterus annectens): An XROMM analysis of jaw mechanics, cranial kinesis, and hyoid mobility

Suction feeding of West African lungfish (Protopterus annectens): An XROMM analysis of jaw mechanics, cranial kinesis, and hyoid mobility

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