Questions related to Marine Invertebrate Biology
The 76 species of Amphipods recorded till now from the west coast of India come majorly under the suborder Amphilochidea and Senticaudata. Looking for the identification key which differentiates them from one another?
We have obtained some electron micrographs showing what appears to be developmental stages of some type of small eukaryotic organism colonizing/parasitizing the tissues of mammalian hosts. Samples tested included sterile deep needle aspirate of subcutaneous nodules, filtered lysed whole blood, and urine sediment. The hosts may have a unique genetic defect allowing them to become infected with eukaryotic parasites, or, the putative parasite may have efficient strategies for suppressing the hosts immune response.
We are curious about the identity of this possibly novel organism. None of us in the research group have more than basic knowledge of invertebrate taxonomy, but based on the presence of organized calcified “tube or shell”-like structures, we are hypothesizing that it may be some type of polychaete or mollusk? The opinion or thoughts of anyone skilled in such classification would be very appreciated. Thanks!
I'm doing my postgraduate studies and I am developing my research on the taxonomy of polyclads (Platyhelminthes: Polycladida). In addition, I am doing molecular taxonomy, so I am interested about knowing the best molecular marker for this taxa.
I thank in advance for your help and support.
I have a ciliate problem in my aquaculture system and would like to ID two ciliates that I believe feed on mollusk? I have photomicrographs...
Are there any ciliate experts out there who might help?
at the Museum of Nature South Tyrol, in Bolzano / Bozen, Italy, we're keeping in aquarium for more than 10,5 years 3 American horseshoe crabs Limulus polyphemus.
What is the maximum longevity of American horseshoe crab in aquarium?
I have read some reports on cone snails regarded as its primary predator, but have not found any papers detailing specific predators of the bearded fireworm based on stomach contents, field observations etc.
I am currently analysing temporal and spatial zooplankton groups and in many samples from the same time period there appears to be a very high proportion (~90%) of the same group (Cladocera). I have been unable to find literature related to whether zooplankton (specifically cladocera) can develop in blooms under optimum conditions, similar to those of phytoplankton.
If anyone could point me in the direction of any literature related to this topic, it would be greatly appreciated!
This bivalve looks like Cardita senegalensis based on the elongaeted shell on the posterior side of the shell. It also has a close resemblance to C. calyculata which has a shorter extension. Elevated blunt thorn-like structures are noticed in the ribs with mild orange dots.
It is hypothesized that harpacticoid copepods are the only meiofaunal organisms to develop larval stages because their nauplii share the same habitat as the adults. I am interested to know whether the nauplii (larvae) and copodite stages of harpacticoid copepods are pelagic or benthic compared to calanoid or cyclopoid copepods?
Soon I will be collecting data on the group composition of zooplankton samples (genus/group level), I was just wondering whether it is appropriate to present this data in the form of a diversity index (such as Shannon-Weiner, Simpsons, Berger-Parker etc.) or whether this is more restricted to communities identified to species level?
Would it be better to simply present this data as richness, proportions or frequency?
Any suggestions would be greatly appreciated.
Good day to all. We have this data on mercury content of our collected sediments (mg/kg) and we would like to know if the amount of mercury that we have is normal or above normal. Are there governing bodies which sets these parameters for us to infer something with the results of our analysis? Thank you and God bless us all.
Barnacles, mussels, etc. attach to surfaces to settle on the bottom. Many other crustaceans also attach spermatophores on the female body surface for reproduction.
Do they all use the same kind of "glue"? I guess the first example (barnacle, mussels, etc.) is well known (due to biofouling-related research), but what about attaching spermatophores in other crustaceans? Spermatophores need to last long enough to transfer sperm, but how long? What is this glue/cement and how does it work? How long does it stick and why doesn't water dissolves it? how and where is it produced in the male body? Can you name examples?
What echinoderm species are these? Please help identify the following species. I have pre-identified some which are
Pic 1 - P. nodosus
Pic 2 - L. laevigata
Pic 3 - A. planci
Pic 4 - T. gratilla
Pic 5 - D. setosum
All of these were collected from the Philippine waters. I cannot identify the rest. Thanks!
I am looking for a picture taken from this fanworm species. It's distribution is in Atlantic Ocean and Mediterranean sea.
A similar operculum is attached.
I am in need of a specific name for the Phakellia sp. sample I am currently studying on since I am not an expert on marine species. Here's a photo.
Any answer will be appreciated. Thank you.
Please help to trace this uniquely colored crab chela.
The chela has been encountered on last March from a fisherman's net from Saint Martin's Island of the Bay of Bengal. The catcher just threw crab away considering trash fishery (thinking brightly colored so possibly be non-edible). The chela was the only remain attached to the net and has been preserved.
Went through country's encyclopedia and recently updated IUCN redlist of crustaceans of Bangladesh. Saw no entry in it. However, I think the chela belonged to a swimming portunid crab.
I know the identification can be hard to do from such a remain. Such lilac-purple color seems so intriguing to me.
Any insight on the identification will be very much appreciated.
I am looking for help with a presentation I am doing for my Microbiology class. I am doing a research presentation on tardigrades (aka water bears or moss piglets). As part of this project, I decided to "hunt" for some tardigrades of my own and successfully found some in a Spanish moss sample collected nearby a local lake. In the sample, I noticed several cells that appear to be peritrichous with an "x" shape in what appears to be a nucleus. The tardigrades appeared to gather around these cells and even possibly cling to them. I was wondering if anyone could give me some ideas as to what they could be so I could do some further research and maybe describe a possible relationship between the tardigrades and these cells. For some reference, this was viewed under a compound light microscope with a 40x ocular lens, for a combined magnification power of 400x. These cells appeared to be over double the size of the tardigrades and were stagnant. Any help is greatly appreciated. You can see the "cell" pictured her. It is hard to make out, as there is algae gathered around it. I also keep calling this a cell, but given it's size, I'm not sure if it's single-called, or a multicellular organism. Thank you.
My student tried a method of gradually adding freshwater with 10% ethanol until ending with a 50:50 seawater:freshwater concentration, but it did not work.
These corals were observed in the central Red Sea. In some of these photos Acropora if it is possible I need species name. For other even genus name is enough.
A co-worker found this unknow flatworm along a citycanal in Amsterdam. We have no idea what this might be, so any help is welcome. It is probably non-indigenous. It was collected using a pondnet in the canal, but it may prove not to be aquatic after all.
I would like to know the best sampling methodology to separate meiofaunal polychaetes from substrate. I have once sampled soft-bodied meiofauna by using magnesium chloride (MgCl2) as anesthetic, but I do not know if there is another similar substance to use. I would rather not use the "bubble and blot" methology as it is better to obtain organisms with hydrophobic cuticle.
I would also like to know if meiofaunal polychaetes are more abundant in some substrates than in others.
Please I need help on the pollution tolerant level for the following marine benthic invertebrates collected along the coastline of my sampling site. Phylum which is Arthropoda and Class Crustacea for Hermit crab, Sand flea and Prawn. Second one is Phylum Mollusca and Class Gastropoda and Bivalvia for a snails and shells. The last one is Phylum Annelida Class of Polychaeta. These are the common benthic invertebrates in my samples for measuring the Pollution by their diversities, Tolerance scores if there is any and the last one if there is any available resources that could help me out to identify whether these invertebrates are pollution tolerant or intolerant?
I found these oribatids in sediment samples. I would like to know if I should include them in my study on the benthic community in caves of the northern plain of Yucatan.
I have read that the vast majority of oribatid mites are strictly terrestrial but there are some families that are found in freshwater habitats ranging from springs to lakes.
The collegues in our institute have tried hard to develop molluscan cell culture techniques. However, the cells maintained a low viability and scarcely survived for more than one week (including cells from gill, mantle, or haemocytes), leaving alone primary culture or subculture. I was eager to know why this happens, and how to improve the conditions of the cells.
I am looking for some pictures of gelatinous organisms for which there is strict copyright on the net for all pictures.
We did an identification guide for non-commercial use for the french MSFD (Marine Strategy Framework Directive) in order to help monitoring those organisms through a simple protocol (for conservation and management issues, no commercial use).
I am looking for pictures of those specific species:
Please, if you provide me with a picture, give the name of the author and which type of licence you prefer (pure copyright, no right to copy or re-use the picture from the document where it will be put) or common creative licence (can be copied, but name of author has to be written and it cannot be used for commercial use).
Thanks a lot in advance!
I just collected these specimen along the coasts of Kerala, from the rocky substratum. Attached the photo of the specimen with this message, Help me to identify the specimen.
Something like an identification key, especially for freshwater microalgae
Or maybe can someone of you with experience in this field help me in identifying some species i collected from two lakes in Algeria.
After spawning induction of razor clams (Solen regularis) using dry chilling method (4-6 degree Celcius) and thermal shocking technique (27-30 degree Celcius). The gametes released were mixed to carry out the artificial fertilization. The fertilized eggs were found but there was no D-shaped larvae formation in every attempts.
Many parasites were released by the clams during spawning induction such as Ciliates sp., Cercaria sp., Trematode and even Copepode.
Your comments and suggestions are welcome.
A colleague found this polyclad among mussels on a harbor wall in Zeebrugge(Belgium). It measures 2cm. Can someone help with the identification?
Thanks in advance
Collected from closed cenotes in Yucatan, México.
1 y 2 Gastropods measure approx. 2.4 mm
3 Gastropods (juvenile?) 0.67 mm
4 y 5 Egg?