Dear Mrunmayi,

Not possible into species level. More than 30 marine families. But this is Calanoidea, looks adult. , no good view of Antennae but configuration shows Calocalanus...  Like a minimum should cut the abdomen to have good look on PI-P5, exo- & endopods. After that use special ID key for the area. For the area you are asking it appear frequently I hope more than 200 species. And the same amount are rare.

As guidence can use The Biology of Calanoid Copepods by J. Mauchline or some articles (Chapters) from the Biology of Indian Ocean (Springer Ver).

Like a key I'm attaching Kasturirangan for the most common species (good for students level!).

Try, will guess a success from you. Inform me about the result.

Andrey

Dear Mrunmayi,

As all copepodologists knows that identification of copepods to the level of species need to dissect it and illustrate the 5th.swimming leg for both male and female as well as the entire A1, from the above photos i thing it belong to calanoid copepod, family pontellidae the rostrum and forcal rami resembles that of the genus Labidocera or in less way of of Pontella to be more precisely it is necessary to send the drawing of p5 and A1 and urosome ( abdomen) 

I agree with Andrey about using of Keys for identification

Dear Mrunmayi,

in addition to above suggestions, it is important to measure  the total length of your unidentified calanoid copepod, because most species belonging to the family pontellidae are of lengths ranging between 2-3.5 mm or some times more. 

Dear Mrunmayi, 

In my experiment, you can take a look from the genus Euchaeta and using the Keys of identification or took a photo of P5 from this species.

http://copepodes.obs-banyuls.fr/en/fichefam.php?fam=21#g88

Best regards,

Hai Trinh

I agree, it looks like an Euchaeta sp. male. But the P5 seems different.

Please take a photo of  P5. Try in ventral view, if you do not want to dissect your copepod

It is probably a male of one of the species of Pleuromamma based on what i can see from the P5

I agree with Astrid that it has characteristics of Pleuromamma spp. It resembles a male Pleuromamma xiphias but it is difficult to be positive from the images. The antennules appear very broad, but it may be the angle the image was taken from. If it is Pleuromamma it should have a small dark button on the right hand side of the prosome close to the the division of the first and second somites.  

Hello Mrunmayi Rane,

I agree with Astrid and David. Looking at the A1 and the P5 it definitely looks like a male belonging to the family  METRIDINIDAE and very likely the Genus Pleuromamma. Can you send us a few specimens if you have others available? We would need to have a look at it in more detail under a microscope and do some dissections if you want further help with the identification. Below is my address.

All the best wishes,

Claudia 

Dr Claudia Castellani

 Research Fellow / Plankton Taxonomist

Sir Alister Hardy Foundation for Ocean Science (SAHFOS)

The Laboratory Citadel Hill Plymouth, PL1 2PB, United Kingdom

e-mail: [email protected]

http://www.sahfos.ac.uk

this is Gaussia, looks like male, need to see the posterior lateral corners of the prosome and the p5 to put it to species, look on http://copepodes.obs-banyuls.fr/en/index.php under that genus for diagrams, descriptions and distribution

 Thank you all for time !

It resembles closest to Genus Gaussia!