Pelanechinus is an extinct genus of sea urchins in the order Echinothurioida.
[4] Pelanechinus corallina is the type species of the genus and was originally described from Yorkshire, England from a single fossilised specimen in which only the oral part of the test was preserved.
Another incomplete specimen found later in the coral rag at Calne, England had a test with a diameter of 85 millimetres (3.3 in) and was somewhat dorso-ventrally flattened.
The mouthparts and teeth were distinct with small overlapping plates surrounding the mouth is the peristomal area .
The plates are similarly fused in groups of three in the ambulacral area but there are three tubercles on the set, the central one being the largest.