A soft origin for a forceful bite: motor patterns of the feeding musculature in Atlantic hagfish, Myxine glutinosa

Clark, A. J.; Maravilla, Erick; Summers, Adam P.

doi:10.1016/j.zool.2010.02.001

Cited by 13 publications

(21 citation statements)

References 18 publications

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“…2011). Nektonic jawless fishes cannot be excluded a priori from these and other trophic strategies (Purnell 2001 b ), especially in the light of the functional capabilities of living agnathans (Clark and Summers 2007; Clark et al. 2010).…”

Section: Early To Mid‐palaeozoic Eventsmentioning

confidence: 99%

Five hundred million years of extinction and recovery: a phanerozoic survey of large‐scale diversity patterns in fishes

Friedman¹,

Sallan²

2012

Palaeontology

194

230

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: Fishes include more than half of all living animals with backbones, but large‐scale palaeobiological patterns in this assemblage have not received the same attention as those for terrestrial vertebrates. Previous surveys of the fish record have generally been anecdotal, or limited either in their stratigraphic or in their taxonomic scope. Here, we provide a broad overview of the Phanerozoic history of fish diversity, placing a special emphasis on intervals of turnover, evolutionary radiation, and extinction. In particular, we provide in‐depth reviews of changes during, and ecological and evolutionary recovery after, the end‐Devonian (Hangenberg) and Cretaceous–Palaeogene (K–Pg) extinctions.

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Section: Early To Mid‐palaeozoic Eventsmentioning

confidence: 99%

Five hundred million years of extinction and recovery: a phanerozoic survey of large‐scale diversity patterns in fishes

Friedman¹,

Sallan²

2012

Palaeontology

194

230

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“…Despite having many highly peculiar morphological features, hagfishes and lampreys are crucial to study the evolutionary transitions from non‐vertebrate animals to gnathostomes (e.g. Huxley, ; Holmgren, ; de Beer, ; Marinelli & Strenger, , ; Fritzsch & Northcutt, ; Horigome et al ., ; Kuratani, Horigome & Hirano, ; Kuratani, ; Clark & Summers, ; Ota, Kuraku & Kuratani, ; Clark et al ., ; Miyashita, and citations therein). Comparative data from cyclostomes would allow use of a phylogenetic approach to constrain the origin and early evolution of the vertebrate cephalic muscles.…”

Section: Introductionmentioning

confidence: 97%

“…The resulting nomenclatural confusions are further exacerbated by the lack of reference to a specific taxon and by the lack of a test for phylogenetic congruence within a lineage (e.g. Mallatt, , ; González‐Isáis, ; Clark, Maravilla & Summers, ). For example, there is little information in simply comparing ‘labial muscles’ of ‘lampreys’ and ‘sharks’ (Mallatt, ), because no specific muscles are identified and because individual muscles may represent conditions specific to particular species rather than conditions general to the lineage.…”

Section: Introductionmentioning

confidence: 99%

“…The cephalic muscles of cyclostomes have been described in some detail by, for instance, Marinelli & Strenger (: Lampetra fluviatilis ), Marinelli & Strenger (: Myxine glutinosa ) and Miyashita (: Eptatretus stoutii ). Functional analyses of the feeding in hagfishes (Clark & Summers, ; Clark, Maravilla & Summers, ) provide kinematic data on the muscles of the lingual apparatus. However, these studies are limited in taxonomic sampling, leaving uncertainties about phylogenetic congruence of characters.…”

Section: Introductionmentioning

confidence: 99%

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Cephalic muscles of Cyclostomes (hagfishes and lampreys) and Chondrichthyes (sharks, rays and holocephalans): comparative anatomy and early evolution of the vertebrate head muscles

2014

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Living vertebrate diversity comprises hagfishes and lampreys (Cyclostomata), elasmobranchs and holocephalans (Chondrichthyes), and bony fish which include tetrapods (Osteichthyes). Based on dissections and an extensive comparative analysis, we provide an updated overview of the anatomy, homologies and evolution of cyclostome and chondrichthyan cephalic muscles, with osteichthyans as primary comparative taxa. The analysis also infers plesiomorphic conditions for vertebrates and gnathostomes. We follow a uniform myological terminology for the Gnathostomata to demonstrate that the last common ancestor of extant vertebrates probably had a single intermandibularis and other mandibular muscles (labial muscles), some constrictores hyoidei and branchiales, and epibranchial and hypobranchial muscle sheets. The division of the cucullaris into levatores arcuum branchialium and protractor pectoralis is an osteichthyan synapomorphy and reflects an evolutionary trend towards a greater separation between the head and pectoral girdle that culminated in the formation of the tetrapod neck. Hence, this paper addresses a long-standing, central issue regarding vertebrate comparative anatomy. It thus provides a valuable basis for future evolutionary, developmental and functional studies of vertebrates and/or of specific vertebrate subgroups/model organisms.

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“…The feeding apparatus of myxinids resembles a sausage with a relatively stiff anterior part, which includes the dental plate and protractor muscles, and a soft posterior part comprising a complex arrangement of muscles that control retraction [Fig. 1(c)] (Clark et al , 2010). The protraction–retraction movement occurring in the stiff anterior half of the feeding apparatus is supported by an underlying series of robust cartilages called a basal plate, which comprises anterior, middle and posterior divisions [Fig.…”

Section: Introductionmentioning

confidence: 99%

Ontogenetic scaling of the morphology and biomechanics of the feeding apparatus in the Pacific hagfish Eptatretus stoutii

Clark

Summers

2011

Journal of Fish Biology

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The form and function of the support skeleton, musculature and teeth were examined in an ontogenetic series of Pacific hagfish Eptatretus stoutii spanning about a six-fold range in total length (L(T)). Tooth area, feeding apparatus length, basal plate size, theoretical dental plate retractile force, penetration force and applied tooth stress were measured relative to body size. Morphological variables (e.g. tooth area and basal plate size) scaled with positive allometry and functional variables (e.g. retractile force and applied tooth stress) scaled isometrically with L(T). These results suggest that juveniles do not undergo ontogenetic dietary changes and consume functionally equivalent prey to adults, although adults can grasp proportionally larger portions of food. Low tooth stress in juveniles and adults imposes mechanical constraints to puncturing and tearing, which are circumvented by a preference for softer prey tissue or the inclusion of knotting behaviours for reducing tougher prey.

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A soft origin for a forceful bite: motor patterns of the feeding musculature in Atlantic hagfish, Myxine glutinosa

Cited by 13 publications

References 18 publications

Five hundred million years of extinction and recovery: a phanerozoic survey of large‐scale diversity patterns in fishes

Five hundred million years of extinction and recovery: a phanerozoic survey of large‐scale diversity patterns in fishes

Cephalic muscles of Cyclostomes (hagfishes and lampreys) and Chondrichthyes (sharks, rays and holocephalans): comparative anatomy and early evolution of the vertebrate head muscles

Ontogenetic scaling of the morphology and biomechanics of the feeding apparatus in the Pacific hagfish Eptatretus stoutii

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