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Dinosterane is a type of steroidal alkane, also known as 4α,23,24-trimethylcholestane. It is used in geochemistry as a biomarker, interpreted as an indication of dinoflagellate presence.

History of Use as a Biomarker
Dinosterane has been used as a proxy for dinoflagellates due to its high occurrence in extant dinoflagellate species and its rarity in other taxa, although it has been shown to be produced by a single species of marine diatom as well.

A 1984 study was conducted

In 1993, dinosteranes were discovered in a section of the Bristol Trough that was dated to the Rhaetian Age. Due to the co-deposition of these dinosteranes with dinoflagellate cysts and comparison of microfossil abundance with hydrocarbon abundance, the dinosterane was associated with marine dinoflagellates. This was the first stratigraphic evidence for Mesozoic dinoflagellates.

In 1998, dinosteranes were found in high relative abundance in samples from the Lükati Formation, which were collected from the Kopli quarry in Estonia. This evidence was used to place the origin of dinoflagellates as early as the Early Cambrian, much earlier than the Bristol Trough studies had been able to.

Characterisation
Dinosterane's mass spectrum shows a highly increased abundance of the m/z = 98 ion compared to 24-ethyl-4α-methylcholestane, which is likely due to preferential cleavage of the C-22,23 bond.