Results 141 to 150 of about 629 (159)
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Ultrastructure of the ampullae of Lorenzini of Aptychotrema rostrata (Rhinobatidae)
Zoomorphology, 2008Small epidermal pores of the electrosensory ampullae of Lorenzini located both ventrally and dorsally on the disk of Aptychotrema rostrata (Shaw and Nodder, 1794) open to jelly-filled canals, the distal end of which widens forming an ampulla that contains 6 ± 0.7 alveolar bulbs (n = 13).
Ian Tibbetts +2 more
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Copeia, 2019
A new guitarfish of the genus Pseudobatos is described based on 82 specimens obtained from the Gulf of California. Sixty-three morphometric measurements were taken on all specimens, and on ten specimens from each of three congeners. A principal component analysis and linear discriminant analysis were performed on these morphometric data for ...
Kelsi M Rutledge
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A new guitarfish of the genus Pseudobatos is described based on 82 specimens obtained from the Gulf of California. Sixty-three morphometric measurements were taken on all specimens, and on ten specimens from each of three congeners. A principal component analysis and linear discriminant analysis were performed on these morphometric data for ...
Kelsi M Rutledge
exaly +2 more sources
Feeding habits of the speckled guitarfish Rhinobatos glaucostigma (Elasmobranchii: Rhinobatidae)
Journal of Fish Biology, 2015The stomachs of 464 speckled guitarfish Rhinobatos glaucostigma were sampled from the south‐eastern Gulf of California (GC) to determine diet composition. Numerical indices and prey‐specific index of relative importance (%IPSIR) were used to determine the feeding strategy of the species.
R E, Lara-Mendoza +2 more
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การศึกษาอนุกรมวิธานของปลานินและโรนัน (Rhinidae, Rhinobatidae และ Glaucostegidae) ในน่านน้ำไทย
2023ปลาโรนินและโรนันเป็นปลากระดูกอ่อนในอันดับ Rhinopristiformes โดยในประเทศไทยพบจำนวน 4 วงศ์ ได้แก่ Pristidae (วงศ์ปลาฉนาก), Rhinidae (วงศ์ปลาโรนินและปลาโรนันจุดขาว), Rhinobatidae (วงศ์ปลาโรนันหัวใส), Glaucostegidae (วงศ์ปลาโรนันหัวใสยักษ์) และ Platyrhinidae (วงศ์ปลานันพัด) ปลาเหล่านี้เป็นสิ่งมีชีวิตประเภท K-selected species ซึ่งมีช่วงชีวิตยืนยาว เข้าสู่ช ...
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Complete mitogenome of the brown guitarfish Rhinobatos schlegelii (Rajiformes, Rhinobatidae)
Mitochondrial DNA Part A, 2014The complete mitochondrial genome of the brown guitarfish Rhinobatos schlegelii is presented for the first time in this study. It is 16,780 bp in length, consisting 13 protein-coding genes, 22 tRNA genes, 2 rRNA genes and 1 putative control region with the typical gene order and direction of transcription in vertebrates. The overall base composition is
Xiao, Chen +4 more
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Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 2004
This study investigated the nature of vasodilator mechanisms in the dorsal aorta of the giant shovelnose ray, Rhinobatus typus. Anatomical techniques found no evidence for an endothelial nitric oxide synthase, but neural nitric oxide synthase was found to be present in the perivascular nerve fibres of the dorsal aorta and other arteries and veins using
Donald, J. A. +2 more
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This study investigated the nature of vasodilator mechanisms in the dorsal aorta of the giant shovelnose ray, Rhinobatus typus. Anatomical techniques found no evidence for an endothelial nitric oxide synthase, but neural nitric oxide synthase was found to be present in the perivascular nerve fibres of the dorsal aorta and other arteries and veins using
Donald, J. A. +2 more
openaire +5 more sources
Environmental Biology of Fishes, 2009
Size at sexual maturity, reproductive cycle, and fecundity of the guitarfish, Rhinobatos hynnicephalus, were examined in Ariake Bay, Japan. Females reached sexual maturity at a larger size than males [total length (TL) at 50% sexual maturity: males, 431 mm; females, 476 mm]. Monthly gonadosomatic indices of males decreased abruptly from July to August.
Gen Kume +3 more
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Size at sexual maturity, reproductive cycle, and fecundity of the guitarfish, Rhinobatos hynnicephalus, were examined in Ariake Bay, Japan. Females reached sexual maturity at a larger size than males [total length (TL) at 50% sexual maturity: males, 431 mm; females, 476 mm]. Monthly gonadosomatic indices of males decreased abruptly from July to August.
Gen Kume +3 more
openaire +1 more source
Zootaxa, 2017
Rhinobatos austini sp. n. is described from the southwestern Indian Ocean based on four specimens collected from the KwaZulu-Natal Province, South Africa and from Mozambique. The new species, with one exception, can be distinguished from all other members of this genus by a prominent teardrop-shaped dark blotch on the ventral surface of its snout.
David A, Ebert, Ofer, Gon
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Rhinobatos austini sp. n. is described from the southwestern Indian Ocean based on four specimens collected from the KwaZulu-Natal Province, South Africa and from Mozambique. The new species, with one exception, can be distinguished from all other members of this genus by a prominent teardrop-shaped dark blotch on the ventral surface of its snout.
David A, Ebert, Ofer, Gon
openaire +2 more sources