XII.—The Lateral Sense Organs of Elasmobranchs: The Ampullary Canals of the Genus Raia.

Lamont, Augusta

doi:10.1017/s0080456800011558

Cited by 3 publications

(2 citation statements)

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“…3b) (present study), Amblyraja, Leucoraja, Raja, and AA-Raja (Lamont 1916;Raschi 1986). The medially narrow rostral shaft and broad anterior neurocranium fontanelle of Hongeo (Fig.…”

Section: Methodssupporting

confidence: 54%

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Hongeo, a new skate genus (Chondrichthyes: Rajidae), with redescription of the type species

Jeong

Nakabo

2009

Ichthyol Res

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Hongeo gen. nov. is proposed following examinations of several individuals, including adult males, of the type species Raja koreana, previously described from a single adult female specimen from the southern coast of the Korean Peninsula. A number of external (including claspers, squamation, and ampullary and lateral line canal systems) and skeletal characters are newly described. The phylogenetic position of R. koreana among 26 nominal rajid supraspecific taxa plus 2 unnamed supraspecific taxa of Rajidae and 3 outgroups was estimated. According to a strict consensus tree of 20 equally parsimonious trees of 139 steps (CI = 0.626; RI = 0.850; RC = 0.532; HI = 0.374), Hongeo gen. nov. is defined by the two derived character states: rostral cartilage continuous with neurocranium and stout proximally, but very slender and uncalcified distally; and anterior fontanelle broad, extending forward onto the basal part of rostral cartilage slightly beyond the leading edge of nasal capsules. The new genus also differs from all other supraspecific taxa of Rajidae in the following combination of characters: dorsal surface of tail with a row of distinct thorns along midline in both sexes; most thorns directed anteriorly; a pair of longitudinally elongated black blotches having undulated contours on middle of dorsal surface of disc; three groups of outer buccal ampullae and tubules; three groups of nasal ampullae and tubules; hyoidean ampullae and tubules on ventral surface posteriorly extending past cloaca; rostral shaft narrow with filamentous cartilage at base; scapulocoracoid comparatively short and high with dorsoventrally elliptical anterior fenestra and expanded postventral fenestra; external margin of mesopterygium of pectoral fin slightly undulated, not sinuous, and not fused with pectoral radials; and clasper component eperon and pent present.

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“…3b) (present study), Amblyraja, Leucoraja, Raja, and AA-Raja (Lamont 1916;Raschi 1986). The medially narrow rostral shaft and broad anterior neurocranium fontanelle of Hongeo (Fig.…”

Section: Methodssupporting

confidence: 54%

“…4a; Jeong and Nakabo 1997). The pattern of three groups of outer buccal ampullae and tubules is seen only in Hongeo and Dipturus batis (Linnaeus 1758) from the Atlantic Ocean (Ewart and Mitchell 1891;Lamont 1916) among the Rajidae (Fig. 3a).…”

Section: Methodsmentioning

confidence: 97%

Hongeo, a new skate genus (Chondrichthyes: Rajidae), with redescription of the type species

Jeong

Nakabo

2009

Ichthyol Res

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A morphological analysis of the ampullae of Lorenzini in selected skates (Pisces, Rajoidei)

Raschi

1986

Journal of Morphology

144

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A comparison of the ampullae of Lorenzini among 40 species of skates (Rajoidei) demonstrates a close relationship between inferred electroreceptive capabilities and feeding mechanisms. Three general lines of morphological modifications are noted. (1) Whereas the majority of ampullary pores are located on the ventral surface of the dorsoventrally flattened body, the relative proportion of ventral pores is significantly lower on species inhabiting aphotic waters. (2) The ventral pores on more piscivorous species are distributed over a larger portion of body surface than they are on those species that feed primarily on invertebrates. Ventral pores in this latter group are more noticeably concentrated around the mouth and their densities on the adult are inversely related to the overall mobility of preferred prey species. (3) The size of each ampulla and the number of alveoli associated with it are directly related to the habitat depth occupied by each species. Shallow-water species have smaller ampullae with fewer alveoli than deeper-dwelling (> 1,000 m) species. The general distribution of ampullary pores on deep dwelling rajoids appears to compensate for reduced visual input, whereas their relative densities are a measure of the system's resolution and reflect major differences in feeding strategies. The increased ampullary size and complexity observed in deep-sea rajoids provides mechanisms to increase both the sensitivity and signal-to-noise ratios.

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The Neuroecology of the Elasmobranch Electrosensory World: Why Peripheral Morphology Shapes Behavior

Tricas

2001

Environmental Biology of Fishes

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XII.—The Lateral Sense Organs of Elasmobranchs: The Ampullary Canals of the Genus Raia.

Cited by 3 publications

References 4 publications

Hongeo, a new skate genus (Chondrichthyes: Rajidae), with redescription of the type species

Hongeo, a new skate genus (Chondrichthyes: Rajidae), with redescription of the type species

A morphological analysis of the ampullae of Lorenzini in selected skates (Pisces, Rajoidei)

The Neuroecology of the Elasmobranch Electrosensory World: Why Peripheral Morphology Shapes Behavior

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