Identification

I received new plant, but without name. Please help me with ID.
1.
2.
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Hi, Not the best photo angles to decide, but hear are my suggestions.
1. m. petterssonia.
2. m.mystax or m. grusonii syn. papasqiarensis.
3.m. cowperae ( Moelleriana) or possibly m. jaliscana.
4. m. rekoi sub. leptacantha.
5. m. backebergiana.

I'm not sure about #1, but assuming that it is a reasonable size (8cm tall?) then pettersonii is a reasonable suggestions.
#2 could be M. brandegeei ssp., lewsisiana f. sancarlensis
#3 could be M. stella-de-tacubaya
#4 as per delandmo's suggestion
#5 also.

We are sorry for the poor image quality, but I would like to thank for the determination.
This message is created with machine translation.
cacti Manfred

My suggestions are:
1. M. beiselii, but the number of radials is a bit too high. There are too many radials for it to be petterssonii.
2. M. lewisiana.
3. Difficult to say, looks a bit like M. stella-de-tacubaya, but also differs from it. If it readily dies, it was probably stella-de-tacubaya...
4. M. rekoi leptacantha.
5. M. rhodantha. M. backebergiana (ernestii) should not have 4 centrals.

It looks like the plants would benefit from more light in the growing season.
ID would become a bit easier when there are flowers.

Wolter ten Hoeve.