Vol. 59, 2020
(update: 2020.08.01; 09.22)
Somniosus (Rhinoscymnus) cheni sp. nov., A New Species of Sleeper Shark (Squaliformes: Somniosidae) from Eastern Taiwan, with Aspects of Embryo Biology
Hsu1, Chia-Yen Lin2,3, and Shoou-Jeng Joung2,3,*
Studies Section, Center for Environment and Water, Research Institute,
King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi
Arabia. E-mail: email@example.com (Hsu)
2Department of Environmental Biology and Fisheries
Science, National Taiwan Ocean University, Keelung 20224, Taiwan.
E-mail: firstname.lastname@example.org (Lin)
3George Chen Shark Research Center, National Taiwan
Ocean University, Keelung 20224, Taiwan. *Correspondence: E-mail:
email@example.com (Joung). Tel: +886-2-24622192 ext. 5039
(Received 3 June 2019 / Accepted 28
Communicated by Hin-Kiu Mok
new species of sleeper shark is described based on a 134.0 cm total
length pregnant female collected from off Hualien, eastern Taiwan. The
species belongs to a small species group (subgenus Rhinoscymnus)
and can be distinguished from its congeners in having a smaller second
dorsal fin, smaller eyes, more rows of teeth in the upper jaw and fewer
in the lower jaw, and a different body proportion. Moreover, the
specimen had 33 embryos, which is substantially more than the two other
small species in the subgenus.Information on embryo biology are also provided.
Key words: Elasmobranch, Litter
size, Morphology, Sex-bias, Taxonomy.
Citation: Hsu HH, Lin CY, Joung SJ. 2020. Somniosus (Rhinoscymnus) cheni
sp. nov., a new species of sleeper shark (Squaliformes: Somniosidae)
from eastern Taiwan, with aspects of embryo biology. Zool Stud 59:48.