see this

Hello,

One thing for sure, this is not Balanus (Amphibalanus) amphitrite. In that species the radii are straight and in your species the radii have an oblique edge. It could be Balanus (A.) improvisus – a picture of the terga and scuta could give a conclusive answer.

All the best.,

Francis

Hello! Do you have photos from the terga and scuta ??? it is the best way to identify the species

I agree that it's not Balanus amphitrite and that photos of the dissected terga and scuta (inner and outer faces) would help. Balanus eburneus, maybe?

it is collected from estuary, south west cost of India

Dear friends,

Kindly see the picture below 

Hello all.

No Megabalanus tintinnabulum too (-  the pictured scuba don’t match with the ones of that  species)

Could you upload a picture of the terga (the other pair of opercular plates – these are far better for an identification of members of the amphitrite group.

All the best

Francis

Dear all, hello,

this is difficult to say as others mentioned. I did attach a plate from our paper on different type of A. amphitrite terga and scuta. In A. amphitrite, we normally see the purple stripes on outer shell even in aged or partially eroded specimens. For A. improvisus, there should be a open suture between terga and scuta hinge at upper part in non eroded specimens. But the decision can be made only by seeing the detailed images for terga and Scuta. 

with regards

Alireza Sari

I've sent you a paper by separate e-mail that may help.

Dear friend kindly see updated photographs , it ,may helpful to identify the species

Most specimens are possibly Fistulobalanus kondakovi (Tarasov & Zevina 1957) which was also previously reported as Balanus uliginosus Utinomi 1967. A good starting point for you to check would be

Henry & McLaughlin (1975) The barnacles of the Balanus amphitrite complex (Cirripedia, Thoracica). Zoologische Verhandelingen 141, 1-254

where it is illustrated as Balanus kondakovi. The structure of the tergum will help identification. F. kondakovi can be found in the low salinity regime of estuaries in the Indo-Pacific including India, Malaysia, Indonesia, China, Japan and Australia.

Dear Romanus Edy Prabowo, I have missed that  part wen I dissected , how can i get that while dissecting? 

see more details with tergum

Hello

Now with the terga, it looks like we are indeed dealing with Balanus (Amphibalanus). improvisus (not kondakovi, that species has an excavated basal margin). You can check the labrum, should be simple i.e it has a few teeth on the crest on either side of the notch, contrary to multidenticulate.in many other species of that group.

You may find the publication of Henry &  Mclaughlin, The Barnacles of the Balanus Amphitrite complex (Cirripedia, Thoracica) useful, available from

http://www.repository.naturalis.nl/document/149132

But nevertheless check carefully the ID! ;

All the best

Francis

Dear Kerckhof,

Yoyu are telling that it is probably A.Improvisus?

I agree. The terga confirm that it is not F. kondakovi.

Phil

No chance for Amphibalanus amphitrite?

Indeed, certainly not Balanus (Amphibalanus) amphitrite.

Best,

Francis

Is Balanus (Amphibalanus) amphitrite synonym of Amphibalanus improvisus (Darwin, 1854)

http://invasions.si.edu/nemesis/calnemo/SpeciesSummary.jsp?TSN=89622

Hello,

no these are not synonym names. each are valid species. recently, there is a record of Amphibalanus amphitrite from the Persian Gulf at following link:

http://www.reabic.net/journals/bir/2015/Accepted/BIR_2015_Naser_etal_correctedproof.pdf

. I am not aware closer area to India.

Alireza

sorry in my last reply, I meant Amhibalanus improvisus from the Persian Gulf.

dear  Dr. Alireza SariAmphibalanus amphitrite is already reported from India, but  Dr. Francis Kerckhof  telling that this specimen has similarity of Amphibalanus improvisus ? 

Dr. Alireza Sari  can you  go through the pictures i sent, You also supporting that it is Amphibalanus improvisus ?

Dear Jayachandran,

I should say, from taxonomic point of view, in addition to descriptions, one should examine and compare the material with identified ones. this is very close to A. improvisus by looking at tergum and scutum, but still due to similarities to other species, you need to add more images on mouthparts. please look at the page 74 of Henry & McLaughlin 1975 and check them with those. a high quality close up image from side and upper view of tergo-scutal joint in non-dissected specimen is helpful. As in A. improvisus, there is an obvious gap in the joint. I can not easily see this in your two specimens. it seems there is a gap but a better image may help.. this is also a complementary character for A. improvisus. 

Also look at following link for world locality of species:

http://www.cabi.org/isc/datasheet/91903

good luck

Alireza

Dr. Alireza Sari  please  see

Hello,

I did not tell that Balanus (Amphibalanus) amphitrite is similar to Balanus (Amphibalanus) improvisus.  That must be a misunderstanding.

Both are good species and very well recognizable on morphological characters (see Henry & McLaughlin).

However in the past there have been several  published misidentifications (that hampered earlier identifications). Some are listed in the NEMESIS  fact sheet . Thus according to NEMSIS Balanus amphitrite var. amphitrite in the publication by Stubbings 1967 should concern in reality B. improvisus and hence synonymized .

However, Henry & McLaughlin state in fact that  “therefore, we must questionably assign B. a. amphitrite of Stubbingss (1967), in part, to B. improvisus. And  “Balanus amphitrite amphitrite: Stubbings, 1967: 271”  is in part B. improvisus and “not fig. I4a-f; see B. a. amphitrite and B. reticulatus)” so only part of the depicted specimens in Stubbing’s publication might concern B. improvisus…..

And you will see another name pop up:  B. reticulatus. In fact that species, also a member of the Amphibalanus group, has in the past (and unfortunately is still being  confused with B. amphitrite. However, de terga  are quite different and moreover, the radii are beveled, so not straight as in B. amphitrite. In having beveled radii B. reticulatus resembles somewhat B. improvisus and worn specimens  of both species could be confused with each other.

Therefore it is btw a pity that in the novel  REABIC publication on B. improvisus, B. reticulatus is not mentioned amongst the  Amphibalanus in the table of distinguishing features of species found “in the region”, as B. reticulatus is a well-known fouler that is spreading and could be confused with the other ones…..

To make a long story short, your specimen are most probably B (Amphibalanus) improvisus. Just check with literature if the morphological characters do match.

Best,

Francis

 Dear Dr. Francis Kerckhof , still i have confusion how can I differentiate both A. improvisus and  B. reticulatus

Thank you Dr. Romanus Edy Prabowo

 kindly see vertical cut of latus

Ok then see this

any idea sir?

if it is like that, A. improvisus

I don''t find the original photo of the specimen

Will be helpful a drawing of the mandible.

A. improvisus and A. amphitrite are not synonyms. You can check the website of World Register of Marine Species (WoRMS)

I hesitate between the family  Sabellidae and Serpulidae