Abstract
Cephalopods are ecologically and economically important marine groups in the world. Biodiversity description is essential for sustainable utilization of natural resources and to characterize biological entities for conservation. DNA barcoding is an effective tool used for identification of organisms at species level and is been widely used for delineate several ambiguity species. In this study, partial sequence of mitochondrial cytochrome c oxidase 1 (CO1) gene with a mean size of 680 bp was amplified by universal primers. Totally 13 individuals of Cephalopods comprising of three species, were barcoded and genetic variation was analysed. The maximum A+T content (67.60%) was recorded in Cistopus indicus and minimum (63.70%) in Sepioteuthis lessoniana. The maximum K2P distance (0.268) was found between the genus Cistopus and Sepioteuthis whereas the minimum distance (0.188) was observed between Uroteuthis and Sepia. The neighbour joining tree revealed three distinct clades represents Loligonidae, Sepiidae and Octopodidae with high boot strap values. However, Sepioteuthis lessoniana is showing a bifurcated branch and it may due to the co-occurring of cryptic species and till date this species is treated as Sepioteuthis lessoniana complex.
Highlights
Cephalopods are coming under the phylum Mollusca, which is having two major groups, the Nautiloids and Coleoids
The present study focuses on genetic variations using DNA sequence of mitochondrial genome as DNA barcode
This study aims to examine the genetic characteristics of some cephalopod species collected from the Beypore Fishing Harbour, Kozhikode, South west coastal waters of India
Summary
Cephalopods are coming under the phylum Mollusca, which is having two major groups, the Nautiloids and Coleoids. Nautiloids are covered by an external shell and the Coleoids are lacking this external shell. (Yalla and Mohanraju, 2019). Coleoids comprises of four orders: Sepioidea, Teuthida, Vampyromorphida and Octopodida. They inhabit mainly in coral reef ecosystems taking advantages of this ecosystem as spawning ground, egg placement site, and shelter for the young ones (Pratasik et al, 2019). The major cephalopod groups are distinguishable by Received: 05 Dec 2020. Received in revised form: 01 Feb 2021. From Volume 13, Issue 1, 2021, Notulae Scientia Biologicae journal will use article numbers in place of the traditional method of continuous pagination through the volume
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