Anatomy ofTrigonognathus kabeyai, with comments on feeding mechanism and phylogenetic relationships (Elasmobranchii, Squalidae)

Shirai, Shigeru; Okamura, Osamu

doi:10.1007/bf02905997

Cited by 17 publications

(15 citation statements)

References 3 publications

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“…17). This is similar to the guitarfish and consistent with the proposed muscular basis for squaloid jaw retraction (Shirai and Okamura, 1992). The rostrolateral orientation of the hyoid levator (Fig.…”

Section: Proposed Muscular Basis Of Jaw Protrusion and Retractionsupporting

confidence: 86%

“…The presence of dual, horizontally divided hyomandibular facets in the otic region of the cranium (which apparently permit asymmetrical hyoid movement in Narcine brasiliensis) has been considered a derived batoid and pristiophorid character (Holmgren, 1941;Shirai, 1992a). These dual articular facets are also present in some galeoid (Motta andWilga, 1995,1999) and squaloid (Shirai and Nakaya, 1992;Shirai and Okamura, 1992) sharks, but are positioned either obliquely or vertically (Shirai, 1992b). The presence of this character presents the possibility for asymmetrical feeding kinematics in other batoid species, depending on the behavior of the cranio-hyomandibular joint.…”

Section: Asymmetry In Jaw Protrusion: Skeletal and Proposed Muscular mentioning

confidence: 99%

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Anatomy and functional morphology of the feeding apparatus of the lesser electric ray, Narcine brasiliensis (Elasmobranchii: Batoidea)

Dean

Motta

2004

Journal of Morphology

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Protrusion of the jaws during feeding is common in Batoidea (rays, skates, sawfishes, and guitarfishes), members of which possess a highly modified jaw suspension. The lesser electric ray, Narcine brasiliensis, preys primarily on polychaete annelids using a peculiar and highly derived mechanism for jaw protraction. The ray captures its prey by protruding its jaws beneath the substrate and generating subambient buccal pressure to suck worms into its mouth. Initiation of this protrusion is similar to that proposed for other batoids, in that the swing of the distal ends of the hyomandibulae is transmitted to Meckel's cartilage. A "scissor-jack" model of jaw protrusion is proposed for Narcine, in which the coupling of the upper and lower jaws, and extremely flexible symphyses, allow medial compression of the entire jaw complex. This results in a shortening of the distance between the right and left sides of the jaw arch and ventral extension of the jaws. Motion of the skeletal elements involved in this extreme jaw protrusion is convergent with that described for the wobbegong shark, Orectolobus maculatus. Narcine also exhibits asymmetrical protrusion of the jaws from the midline during processing, accomplished by unequal depression of the hyomandibulae. Lower jaw versatility is a functional motif in the batoid feeding mechanism. The pronounced jaw kinesis of N. brasiliensis is partly a function of common batoid characteristics: euhyostylic jaw suspension (decoupling the jaws from the hyoid arch) and complex and subdivided cranial musculature, affording fine motor control. However, this mechanism would not be possible without the loss of the basihyal in narcinid electric rays. The highly protrusible jaw of N. brasiliensis is a versatile and maneuverable feeding apparatus well-suited for the animal's benthic feeding lifestyle.

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Section: Proposed Muscular Basis Of Jaw Protrusion and Retractionsupporting

confidence: 86%

Section: Asymmetry In Jaw Protrusion: Skeletal and Proposed Muscular mentioning

confidence: 99%

Anatomy and functional morphology of the feeding apparatus of the lesser electric ray, Narcine brasiliensis (Elasmobranchii: Batoidea)

Dean

Motta

2004

Journal of Morphology

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“…A similar condition is found in Trigonognathus , as described by Shirai & Okamura [ 354 ], even though there are two pairs of cartilages anterior to what is considered the fifth hypobranchials. Another shared gill arch similarity between these two genera is the presence of only one basibranchial element.…”

Section: Discussionsupporting

confidence: 70%

Comparative morphology and systematics of the cookiecutter sharks, genus Isistius Gill (1864) (Chondrichthyes: Squaliformes: Dalatiidae)

Petean

Carvalho

2018

PLoS ONE

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The dalatiid genus Isistius Gill (1864) has three valid species currently recognized in the literature: Isistius brasiliensis Quoy & Gaimard (1824), I. plutodus Garrick & Springer (1964), and I. labialis Meng, Zhu & Li (1985). The most common species, I. brasiliensis, has a wide geographic distribution and is found in subtemperate and tropical seas circumglobally. A comparative analysis of specimens from different localities throughout its range, however, had never been undertaken. In the present paper, the morphological variation of this species along its entire distribution has been thoroughly analyzed, corroborating that it represents a single widespread species and that I. labialis is its junior synonym. The other congeneric species, I. plutodus, is known from only a few specimens and is also distributed worldwide. A detailed comparative analysis of available material of I. plutodus was conducted verifying its validity as a single widespread species. The present study analyzed in detail the external morphology (coloration, dentition, dermal denticles), internal morphology (skeleton, musculature), lateral-line canals, and morphometric and meristic characters of species of Isistius in order to better define the genus and its included valid species.

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“…1b ). The other ram feeding sharks project the jaws ventrally or anteroventrally, as observed in the great white shark Carcharodon carcharias 23 , lemon shark Negaprion brevirostris 11 24 , sandtiger shark Carcharias taurus 16 , blacktip shark Carcharhinus limbatus 17 , spiny dogfish Squalus acanthias 11 14 19 , cookiecutter shark Isistius brasiliensis 5 , and viper dogfish Trigonognathus kabeyai 6 . Therefore, the goblin shark is also unique in the direction of its jaw protrusion.…”

Section: Discussionmentioning

confidence: 92%

“…The feeding behaviors of sharks are mostly based on inferences from anatomical studies of specimens 5 6 7 8 9 10 and/or experimental studies of live specimens in a few representative species 9 11 12 13 14 . The feeding behavior of the goblin shark has been inferred from drawings 1 , photographic evidence 15 , and anatomical aspects 8 of specimens.…”

mentioning

confidence: 99%

Slingshot feeding of the goblin shark Mitsukurina owstoni (Pisces: Lamniformes: Mitsukurinidae)

Nakaya

Tomita

Suda

et al. 2016

Sci Rep

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Five striking and prey capture events of two goblin sharks were videotaped at sea for the first time, showing their extraordinary biting process. The goblin sharks swung their lower jaw downward and backward to attain a huge gape and then rapidly protruded the jaws forward a considerable distance. The jaws were projected at a maximum velocity of 3.1 m/s to 8.6–9.4% of the total length of the shark, which is by far the fastest and greatest jaw protrusion among sharks. While the jaws were being retracted, the mouth opened and closed again, which was considered a novel feeding event for sharks. Phylogenetic evidence suggested that their feeding behavior has evolved as an adaptation to food-poor deep-sea environments, possibly as a trade-off for the loss of strong swimming ability.

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Anatomy ofTrigonognathus kabeyai, with comments on feeding mechanism and phylogenetic relationships (Elasmobranchii, Squalidae)

Cited by 17 publications

References 3 publications

Anatomy and functional morphology of the feeding apparatus of the lesser electric ray, Narcine brasiliensis (Elasmobranchii: Batoidea)

Anatomy and functional morphology of the feeding apparatus of the lesser electric ray, Narcine brasiliensis (Elasmobranchii: Batoidea)

Comparative morphology and systematics of the cookiecutter sharks, genus Isistius Gill (1864) (Chondrichthyes: Squaliformes: Dalatiidae)

Slingshot feeding of the goblin shark Mitsukurina owstoni (Pisces: Lamniformes: Mitsukurinidae)

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