[TheSpiceIsLife]

You mean fungi / bacteria > bacteriophage / virus > herbivorous insects > predatory insects > plants / fungi > microogranisms more generally > plants / fungi > insects > reptile > birds > plants > birds > insects > reptile / birds > herbiverous mammals > insects <> bird eating spiders > birds > plants > predatory mammals > bacteria / fungi <> viruses ...

You're over simplying it because you think the oceans are more complicated or something.

[kuhewa]

Well, the food chains are indeed longer and support more trophic levels [1], so with the same degree of cycling as you presented there are indeed more opportunities for complexity.

[1] https://pubmed.ncbi.nlm.nih.gov/27322123

[funnymony]

Do fungi exist at sea?

[oboes]

https://en.wikipedia.org/wiki/Marine_fungi

[kuhewa]

Yes