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  • January 13, 2024 14:07
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January 13, 2024 14:07
after approval message from Jandelsing:
Thank you very much in advance for your time. Here are some photos:
I collected the first large series of oysters (Japanese?) a few years ago on the Belgian beach (I think near Oostduinkerke).
The 2 smaller round ones (also oysters?) with layers, I don't know where they come from (I collected them myself, maybe also on the Belgian coast, maybe in the Dominican or Tenerife...).
The 3 round white snail shells are certainly not from the Belgian coast, I am almost certain that they come from the Dominican (1997).
Is it worth publishing this and how would you bundle it?
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  • January 13, 2024 21:04
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January 13, 2024 21:04
BrunhildeTaens
Enter per (sub) type in the catalog.
This can possibly be done in consultation with jandelsing
Different sites do not produce different items.
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  • January 13, 2024 23:05
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January 13, 2024 23:05
Hello Brunhilde,
I can help you a little further. The shells on the Belgian beach are indeed oysters. Two species are eligible: the common oyster (Ostrea edulis) that you get in the restaurant and Crassostrea gigas. I'm pretty sure the species you found is Crassostrea gigas. Google both names and you will come across images. Crassostrea gigas is often a bit more elongated and you will often find purple spots on the inside. The edge is less crenulated (serrated) than the normal oyster.
- I have difficulty identifying the second shell. It appears that the layers are natural outgrowths. The shell itself (its shape) is therefore hardly recognisable.
- The round shells are definitely Polinices lacteus. (google it!) They belong to the Naticidae (moon shells) family. This species occurs in the Canary Islands, but also in the Dominican Republic, throughout the Caribbean. When collecting shells on the beach, always note the location. That can sometimes be decisive in the determination.
I'm busy adding more and more shells to Lastdodo's Dbase. I have not yet introduced either type. I will enter them as soon as possible so you can add your own photos. You can also enter them yourself, and I will fill in what you don't know. Use photos of the intact copy for the Polinices. Very important for identification is the slit on the left side of the mouth edge. The first second photos of Crassostrea are fine.
Nice that you are participating!
Jan
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  • January 14, 2024 00:05
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January 14, 2024 00:05
Hello Brunhilde,
Two things: Crassostrea gigas is now officially called Magalana gigas. So there you will find the species in Last Dodo's Dbase.
I discovered that Polinices lacteus was already in the Dbase, introduced before my time. I just added Magalana using one of your photos.
Greeting,
Jan

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January 14, 2024 08:14
jandelsing Collectioneur
Isn't this against the Lastdodo rules?
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January 14, 2024 09:07
jandelsing
Via a PM from 015steef500 I understand that it concerns different shells being entered as 1 item.
This is of course a problem with the Naturalia section, because these items are not made in series by people. Each shell will differ from each other in details. In order to be able to identify them, Naturalia are divided into Class, Species, Family, Kingdoms, Order, Tribes, etc.
What should not happen is that different sub-species, etc., are included in 1 item. For each determination at the lowest level, 1 LD item is entered. The photos may show several shells of this identification.
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  • January 14, 2024 13:51
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January 14, 2024 13:51
Hello Collector,
I understand the question. My answer may be complex, but I will limit myself to a few points:
- The lowest level of description for shells is not species, but subspecies. The description model that we use in Last Dodo at Naturalia contains this level.
- A distinction must be made between specimens of a species that do not look exactly the same (= variation in specimens) and official subspecies.
- Official subspecies (subspecies) are scientifically described as such and have a three-part Latin name (e.g. Amphidromus perversus borneensis). I include this type of subspecies in addition to the 'original' species that is Amphidromus perversus (perversus). For some species of land snails such as Amphidromus perversus and Liguus fasciatus, we know as many as 100 official subspecies. Such subspecies often occur in geographically separated areas (niches). It makes sense that this mainly occurs in land snails, which, unlike sea snails, can disperse over much more limited areas.
- Collectors often collect down to subspecies level. They don't lump species and subspecies together. LAST DODO is primarily a site for collectors!
- Major auction sites (see Shellauction.net) offer subspecies separately! There are often large price differences between subspecies. (Based on rarity).
- You will find similar problems in other catalogs (at last dodo). With stamps, for example, we find separate items for completely identical-looking stamps, based on the fact that they are self-adhesive or not, or are cut differently, etc. In catalogs (e.g. Michel) they have different numbers. Last Dodo also records these side by side.
As far as I'm concerned, you can also pass this answer on to your colleague who asked the question. I understand that someone who does not know this collecting area well, nor the international rules of taxonomy, comes to this question.
Greeting,
Jan Delsing

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  • January 22, 2024 17:17
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January 22, 2024 17:17
Thank you. I added the Polinices lacteus in my shop (1 item with quantity 2, because both shells look the same). I added the Magallana gigas as different items because they look different.
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