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Two new species of Thrissina (Clupeiformes: Engraulidae) from the northern Indian Ocean and redescription of Thrissina vitrirostris (Gilchrist and Thompson 1908)

  • Harutaka HataEmail author
  • Hiroyuki Motomura
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Abstract

Thrissina cultella sp. nov., and Thrissina serena sp. nov., are described from the Bay of Bengal and northwestern Indian Ocean, respectively. Although both species resemble T. vitrirostris (Gilchrist and Thompson 1908), which is redescribed from both type and non-type specimens, in having a long upper jaw (posterior tip reaching to pectoral-fin insertion) and similar numbers of gill rakers and ventral scutes, the two new species differ in having fewer transverse scales (9–10 in both vs. 11–12 in T. vitrirostris). Thrissina cultella differs from T. serena in having a slender body [24.4–26.9% of standard length (SL) vs. 26.6–29.4% SL in T. serena], shorter head (25.2–27.1% SL vs. 26.2–27.3%) and pectoral fin (17.5–19.1% SL vs. 19.5–21.3%), and longer pelvic fin (9.3–10.5% SL vs. 7.8–8.7%).

Keywords

Teleostei Morphology Taxonomy Thryssa Thrissina adelae 

Notes

Acknowledgements

We thank D. Catania and M. Hoang (CAS), A. Bosman and D. Clarke (SAM), and J. Williams, K. Murphy, S. Raredon, and D. Pitassy (USNM) for opportunities to examine specimens of the genus Thrissina. We also thank Y. Haraguchi and other volunteers, and students of KAUM for their curatorial assistance, and G. Hardy (Ngunguru, New Zealand) for reading the manuscript and providing help with English. This study was supported in part by a Grant-in-Aid from the Japan Society for the Promotion of Science for JSPS Fellows (DC2: 29-6652); the Sasakawa Scientific Research Grant from the Japan Science Society (28-745); JSPS KAKENHI Grant Numbers JP19770067, JP26241027, JP24370041, JP23580259, and JP26450265; the JSPS Core-to-Core Program: B Asia-Africa Science Platforms; the “Biological Properties of Biodiversity Hotspots in Japan” project of the National Museum of Nature and Science, Tsukuba, Japan; “Establishment of Research and Education Network on Biodiversity and Its Conservation in the Satsunan Islands” project of Kagoshima University adopted by the Ministry of Education, Culture, Sports, Science and Technology, Japan; and the “Island Research” project of Kagoshima University.

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Copyright information

© The Ichthyological Society of Japan 2019

Authors and Affiliations

  1. 1.Center for Molecular Biodiversity ResearchNational Museum of Nature and ScienceTsukubaJapan
  2. 2.The Kagoshima University MuseumKagoshimaJapan

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