Sources : Scallop

Pliny the Elder [1st century CE] (Natural History, Book 9, 51): Sea-scallops [pectines] are held to belong to the same class, which also retire into hiding at seasons of extreme cold and extreme heat; and piddocks, which shine as if with fire in dark places, even in the mouth of persons eating them. - [Rackham translation]

Thomas of Cantimpré [circa 1200-1272 CE] (Liber de natura rerum, Fish 7.65): There are scallops [pectines] in the sea, as Pliny says. They hide during periods of great cold and great heat. For this fish must have temperate air in order to live, since it cannot endure an excess of passions in the elements. [Thomas mistakenly attributes the following to the scallop; see Pliny's description above.] The claws of this fish - for they are armed with claws - glow in the dark like fire. - [Badke translation/paraphrase]