Taxonomic Resolution of the Etmopterus pusillus Species Group (Elasmobranchii, Etmopteridae), with Description of E. bigelowi, n. sp.

Shirai, Shigeru; Tachikawa, Hiroyuki

doi:10.2307/1447149

Cited by 17 publications

(22 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

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“…The most consistent feature seems to be the number of turns in the intestinal spiralvalves, as such data do not show overlap between the species E. bigelowi and E. pusillus in any length class. This characteristic can also be seen in the data cited by Shirai and Tachikawa (1993).…”

Section: Etmopterus Bigelowisupporting

confidence: 69%

“…However, using the Shirai and Tachikawa (1993) criteria, which describe the species E. bigelowi, and with the criteria cited by Last et al (2002), it was possible to obtain a reliable identification of the specimens belonging to the species E. bigelowi. The most consistent feature seems to be the number of turns in the intestinal spiralvalves, as such data do not show overlap between the species E. bigelowi and E. pusillus in any length class.…”

Section: Etmopterus Bigelowimentioning

confidence: 99%

“…In the laboratory, using the criteria described by Krefft (1968), Shirai and Tachikawa (1993), Last and Stevens (1994) and Last et al (2002), the field identification of the specimens classified as E. gracilispinis ( Fig.1)(n = 62; TL: 13.0 -22.3 cm) and E. lucifer ( Fig. 2)(n = 2; TL: 36.9 -38.4 cm) was confirmed.…”

mentioning

confidence: 90%

“…For this specimens the turns in the intestinal valves were counted and some morphological proportions described by Shirai and Tachikawa (1993) and Last et al (2002) were measured (being the distances between the points projected onto the body axis).…”

mentioning

confidence: 99%

“…7. Relationship between total length (TL) and the length of the first dorsal fin spine (LFDS), in 88 specimens from Southern Brazil, with the equations and lines of the regression LFDS-TL from E. bigelowi (solid line) and E. pusillus (dashed line) according to Shirai & Tachikawa (1993). Notice that the values of the Brazilian specimens are distributed around the line for E. bigelowi.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Identification of the sharks of the genus Etmopterus Rafinesque, 1810 (Elasmobranchii: Etmopteridae) from the upper slope of southern Brazil, with comparison between the species E. bigelowi Shirai & Tachikawa, 1993 and E. pusillus Lowe, 1839

Gianeti

Vooren

2008

Braz. j. oceanogr.

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Section: Etmopterus Bigelowisupporting

confidence: 69%

Section: Etmopterus Bigelowimentioning

confidence: 99%

mentioning

confidence: 90%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Identification of the sharks of the genus Etmopterus Rafinesque, 1810 (Elasmobranchii: Etmopteridae) from the upper slope of southern Brazil, with comparison between the species E. bigelowi Shirai & Tachikawa, 1993 and E. pusillus Lowe, 1839

Gianeti

Vooren

2008

Braz. j. oceanogr.

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Dental structure of the Giant lantern shark Etmopterus baxteri (Chondrichthyes: Squaliformes) and its taxonomic implications

2007

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Dogfish sharks (Squaliformes) are a highly diverse group of neoselachians occurring in a wide range of marine environments and are common members of deep-sea faunas. The order Squaliformes comprises six families with approximately 98 extant species. The dentition of most squaliforms is characterized by a strong dignathic heterodonty and dental variation yielding a suite of potential tooth characters that could be used for taxonomic and systematic purposes. So far, no detailed study has been carried out to analyse the use of tooth morphologies in reconstructing the phylogeny of squaliforms. Also, the degree of characteristics of intraspecific variability of tooth morphologies is still unclear. Here, we analysed the dental differences between juveniles and adults and between the sexes of the Giant lantern shark, Etmopterus baxteri, and tested these dental characters for taxonomic purposes employing different statistical procedures. The results show that upper teeth of adult females and males differ morphologically in that those of females are bigger and display a lanceolate central cusp, whereas male specimens have thin and needle-like central cusps. Upper teeth of males have a higher number and a more pronounced variability of lateral cusplets than those of females. Moreover, an ontogenetic heterodonty might be developed in male specimens with sexually immature males displaying similar dental morphologies to those of adult females. Lower teeth, conversely, do not differ morphologically between the sexes. Results indicate that tooth morphologies of squaliform sharks bear high potential for phylogenetic purposes if tooth variations are considered, but have to be treated with care, if no variation is analysed.

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Etmopterus brosei sp. nov.: a new lanternshark (Squaliformes: Etmopteridae) from the southeastern Atlantic and southwestern Indian oceans, with a revised key to the Etmopterus lucifer clade

2021

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Taxonomic Resolution of the Etmopterus pusillus Species Group (Elasmobranchii, Etmopteridae), with Description of E. bigelowi, n. sp.

Cited by 17 publications

References 5 publications

Identification of the sharks of the genus Etmopterus Rafinesque, 1810 (Elasmobranchii: Etmopteridae) from the upper slope of southern Brazil, with comparison between the species E. bigelowi Shirai & Tachikawa, 1993 and E. pusillus Lowe, 1839

Identification of the sharks of the genus Etmopterus Rafinesque, 1810 (Elasmobranchii: Etmopteridae) from the upper slope of southern Brazil, with comparison between the species E. bigelowi Shirai & Tachikawa, 1993 and E. pusillus Lowe, 1839

Dental structure of the Giant lantern shark Etmopterus baxteri (Chondrichthyes: Squaliformes) and its taxonomic implications

Etmopterus brosei sp. nov.: a new lanternshark (Squaliformes: Etmopteridae) from the southeastern Atlantic and southwestern Indian oceans, with a revised key to the Etmopterus lucifer clade

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