Resolving taxonomic ambiguity and distribution of Tremoctopus gracilis (Cephalopoda: Tremoctopodidae) based on molecular evidence

Sajikumar, K K and Sasikumar, Geetha and Viswambharan, Divya and Rahuman, Summaya and Jeena, N S and Vineesh, N and Binesh, C P and Koya, K P Said and Mahesh, V and Rohit, Prathibha and Asokan, P K and Mohan, Smruthu (2024) Resolving taxonomic ambiguity and distribution of Tremoctopus gracilis (Cephalopoda: Tremoctopodidae) based on molecular evidence. Marine Biology, 171. pp. 1-11. ISSN 1432-1793

Text Marine Biology_2024_Sajikumar K K.pdf Restricted to Registered users only Download (4MB) | Please mail the copy request to cmfrilibrary@gmail.com

Abstract

The octopus of the genus Tremoctopus from the Arabian Sea has not been investigated in the past. This study reports on the rare pelagic octopus Tremoctopus gracilis from the south-eastern Arabian Sea. Twenty females with dorsal mantle lengths (DML) ranging between 62 and 160 mm and weighing between 31 and 719 g were examined. These specimens were collected from commercial fishing grounds, and amongst them was a single mature female with 12,618 oocytes in the ovary (size varied from 0.61 to 1.67 mm (mean = 1.13 mm). The detailed morphometric and morphological characteristics were recorded, and the specimens were identified up to the genus level. Further molecular species identification was carried out through mitochondrial markers (COI & 16S rRNA). Phylogenetic analysis, based on partial sequences of the above markers, generated a single clade that included sequences from the Indian and Pacific Oceans, including those misidentified as Tremoctopus violaceus from the Pacific. Evolutionary divergence estimation revealed a high inter-specific genetic divergence from T. violaceus sequences in the Mediterranean Sea and Atlantic Ocean, thus confirming the Tremoctopus species in our study as T. gracilis and authenticated that GenBank sequences of T. violaceus from the Pacific Ocean are indeed T. gracilis.

Item Type:	Article
Uncontrolled Keywords:	Arabian Sea; Blanket octopus; Identification; Taxonomic ambiguity; Molecula
Subjects:	Molluscan Fisheries > Cephalopods Molluscan Fisheries Fish Genetics Fish and Fisheries > Fish Taxonomy
Divisions:	CMFRI-Kochi > Marine Capture > Shellfish Fisheries Division Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Shellfish Fisheries Division CMFRI-Kochi > Marine Capture > Shellfish Fisheries Division Subject Area > CMFRI-Kochi > Marine Capture > Shellfish Fisheries Division CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division Subject Area > CMFRI > CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division Subject Area > CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division
Depositing User:	Arun Surendran
Date Deposited:	11 Jan 2024 07:16
Last Modified:	11 Jan 2024 07:16
URI:	http://eprints.cmfri.org.in/id/eprint/17930

Actions (login required)

View Item