Skip to main content

Description of a new congrid eel, Ariosoma albimaculata sp. nov. (Anguilliformes: Congridae), from the southwest coast of India, Arabian Sea


Ariosoma albimaculata sp. nov. is described herein based on ten specimens [240–487 mm total length (TL)] collected from the deep-sea trawl landings at Colachel fishing harbour, off Kanyakumari, Arabian Sea, west coast of India. The new species is easily distinguished from all other congeners reported earlier, except its sympatric species, Ariosoma maurostigma Kodeeswaran, Mohapatra, Dhinakaran, Kumar and Lal 2022, having dark mark or streak present in the posterior-dorsal margin of eye orbit, but it readily differs from A. maurostigma with the presence of more total vertebrae (161–164 vs. 136–142 in A. maurostigma); more preanal vertebrae (66–68 vs. 47–51); occurrence of white spot or dot on just before the dorsal-fin origin (vs. absent in A. maurostigma); larger preanal length (49.7–55.7% TL vs. 44.0–48.8% TL); larger trunk length (30.4–33.3% TL vs. 23.5–30.2% TL); shorter tail length (44.6–48.2% TL vs. 47.8–54.6% TL). Further, A. albimaculata differs from its sister taxon A. maurostigma with a divergence of 8.1% and other congeners with the genetic distance of 15.0–28.8% in partial mitochondrial COI gene.

This is a preview of subscription content, access via your institution.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7


  • Asano H (1958) Studies on the conger eels of Japan. I. Description of two new subspecies referable to the genus Alloconger. Zool Mag Tokyo 67:191–196

    Google Scholar 

  • Böhlke EB (1982) Vertebral formulae for type specimens of eels (Pisces: Anguilliformes). Proc Acad Nat Sci Phila 134:31–49

    Google Scholar 

  • Castle PHJ (1990) Two new species of the previously monotypic congrid eel genera Poeciloconger and Macrocephenchelys from eastern Australia. Records of the Australian Museum 42:119–126

    Article  Google Scholar 

  • Delaroche FE (1809) Suite du mémoire sur les espèces de poissons observées à Iviça. Observations sur quelques-uns des poissons indiqués dans le précédent tableau et descriptions des espèces nouvelles ou peu connues. Ann Mus Hist Nat, Paris 13:313–361, pls 20–25

  • Fowler HW (1938) Studies of Hong Kong fishes. No. 3. Hong Kong Naturalist 6:1–52

    Google Scholar 

  • Fricke R, Eschmeyer WN, Fong JD (2022) Species by family/subfamily. Eschmeyer's catalog of fishes. Online version, updated 19 May 2022. Accessed 15 May 2022

  • Günther A (1872) Report on several collections of fishes recently obtained for the British Museum. Proc Zool Soc Lon 3:652–675, pls 53–70

  • Hall TA (1999) BioEdit: a user-friendly biological sequence alignment editor and analysis program for Windows 95/98/NT. Nucleic Acids Symp Ser 41:95–98

    CAS  Google Scholar 

  • Jenkins OP (1903) Report on collections of fishes made in the Hawaiian Islands, with descriptions of new species. Bull U S Fish Com 22:417–511, pls 1–4

  • Jordan DS, Snyder JO (1900) A list of fishes collected in Japan by Keinosuke Otaki, and by the United States steamer Albatross, with descriptions of fourteen new species. Proc U S Natl Mus 23:335–380

    Article  Google Scholar 

  • Karmovskaya ES (1991) New species of conger eel (Congridae) from the western Indian Ocean. Vop Ikhtiol 3:891–897 [In Russian. English translation in J Ichthyol 32:1–8]

  • Karmovskaya ES (2004) Benthopelagic bathyal conger eels of families Congridae and Nettastomatidae from the western tropical Pacific, with descriptions of ten new species. J Ichthyol 44(suppl 1):S1–S32

    Google Scholar 

  • Karmovskaya ES (2015) New species of the genus Ariosoma, A. dolichopterum (Bathymyrinae), from the waters of Central Vietnam. J Ichthyol 55:906–910

    Article  Google Scholar 

  • Karmovskaya ES (2018) On the species composition of eels of the genus Ariosoma (Anguilliformes: Congridae) from Nha Trang and Van Phong Bays (South China Sea, Central Vietnam). J Ichthyol 58:455–472

    Article  Google Scholar 

  • Kodeeswaran P, Jayakumar TKT, Akash S, Kumar TTA, Lal KK (2021) A new species of Congrid eel, Ariosoma melanospilos sp. nov., from Indian waters with taxonomic description of A. dolichopterum (Congridae: Bathymyrinae). Mar Biodivers 51:47

  • Kodeeswaran P, Kathirvelpandian A, Acharya S, Mohanty SR, Mohapatra A, Kumar TTA, Lal KK (2022a) Ariosoma indicum sp. nov., a new species of congrid eel (Anguilliformes: Congridae: Bathymyrinae) from the Indian waters. J Fish Biol.

  • Kodeeswaran P, Mohapatra A, Dhinakaran A, Kumar TTA, Lal KK (2022b) A new species of the congrid eel genus Ariosoma (Anguilliformes: Congridae) from the Southwest coast of India. J Fish Biol 100:775–782

  • Kumar S, Stecher G, Li M, Knyaz C, Tamura K (2018) MEGA X: Molecular Evolutionary Genetics Analysis across computing platforms. Mol Biol Evol 35:1547–1549

    CAS  Article  Google Scholar 

  • McCulloch AR, Waite ER (1916) Additions to the fish fauna of Lord Howe Island No. 5. Trans R Soc S Aust 40:437–451

    Google Scholar 

  • Poey F (1860) Memorias sobra la historia natural de la Isla de Cuba, acompañadas de sumarios Latinos y extractos en Francés. Tomo 2. La Habana 2:97–336

    Google Scholar 

  • Reid ED (1934) Two new congrid eels and a new flatfish. Smithson Misc Coll 91:1–11, pl 1

  • Shen SC (1998) A review of congrid eels of the genus Ariosoma from Taiwan, with description of a new species. Zool Stud 37:7–12

    Google Scholar 

  • Smith DG (1989) Family Congridae. In: Böhlke EB (ed) Fishes of the Western North Atlantic, pt 9, 1. Memoir Sears Foundation for Marine Research, New Haven, pp 460–567

  • Smith DG, Kanazawa RH (1977) Eight new species and a new genus of congrid eels from the western north Atlantic with redescriptions of Ariosoma analis, Hildebrandia guppyi, and Rhechias vicinalis. Bull Mar Sci 27:530–543

    Google Scholar 

  • Smith DG, Ho HC, Huang JF, Chang YH (2018) The congrid eel genus Ariosoma in Taiwan (Anguilliformes: Congridae), with description of a new species. Zootaxa 4454:84–106

    Article  Google Scholar 

  • Strömman PH (1896) Leptocephalids in the University Zoological Museum at Upsala. Almqvist & Wiksell, Uppsala

    Book  Google Scholar 

  • Swainson W (1838) On the natural history and classification of fishes, amphibians, & reptiles, or monocardian animals. Vol. 1. A. Spottiswoode, London

    Google Scholar 

  • Talwar PK, Mukherjee P (1977) A note on a new bathypelagic eel, Ariosoma gnanadossi, from the Bay of Bengal. Indian J Anim Sci 47:432–434

    Google Scholar 

  • Temminck CJ, Schlegel H (1846) Pisces, parts 10–14. In: de Siebold PF (ed) Fauna Japonica, Sive Descriptio Animalium Quae in Itinere per Japoniam Suscepto Annis 1823–30 Colle-git, Notis Observationibus et Adumbrationibus Illustravit. Arnz et Socios, Leiden, pp 173–269

  • Thompson JD, Gibson TJ, Higgins DG (2003) Multiple sequence alignment using ClustalW and ClustalX. Curr Protoc Bioinformatics 0:2.3.1– 2.3.22

Download references


The authors are grateful to the Director of ICAR-National Bureau of Fish Genetic Resources (NBFGR), Lucknow (Grant No. IXX12641), for providing financial support under the Institute project on Exploration in marine islands and encouragement. Dr. Anil Mohapatra, Scientist-E, Zoological Survey of India, is acknowledged for his valuable suggestion regarding species identification. The authors extending their thanks to Mr. Rujan, M. F. Sc., student of ICAR-Central Institute of Fisheries Education, for his assistance in sample collection.

Author information

Authors and Affiliations


Corresponding author

Correspondence to Thipramalai Thangappan Pillai Ajith Kumar.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

This article was registered in the Official Registry of Zoological Nomenclature (ZooBank) as 8796A0AD-860C-4236-A1F8-F85E8F8775FD.

This article was published as an Online First article on the online publication date shown on this page. The article should be cited by using the doi number.

About this article

Verify currency and authenticity via CrossMark

Cite this article

Kodeeswaran, P., Dhas, D., Kumar, T.T.P.A. et al. Description of a new congrid eel, Ariosoma albimaculata sp. nov. (Anguilliformes: Congridae), from the southwest coast of India, Arabian Sea. Ichthyol Res (2022).

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • DOI:


  • Bathymyrinae
  • Arabian Sea
  • Systematics
  • New eel