« The colour of the backkground and of the tubercles is of a light caramel brown, while the interspace between the spiral cords is darker, giving them an “articulate” appearance. […] Teleoconch with whorls almost flat; suture indistinct. Sculpture made of three spiral cords: the cords 1 and 3 appear first, the cord 2 circa the 8th whorl. The cord 4 is hidden along the whole spire and is only exposed near the aperture; this cord is granulose.The first basal cord is slightly granulose, the second one completely smooth. […] Peristome flared; posterior notch shallow, very open; […] siphonal canal rather long, closed at the base. » – P. Bouchet: “Les Triphoridae de Méditerranée et du proche Atlantique”, Lavori, Società Italiana di Malacologia 21, Milano 1985, p.24-26.

« In fact, the teleoconch of M. thiriotae is above all very close to that of Similiphora similior, whose general hue and articulate spiral cords are indistinguishable from those of M. thiriotae; the main conchological difference is the presence of a fourth spiral cord rather granulose in M. thiriotae, rather smooth in S. Similior. The protoconches, the colour of the living animals and the radulas are, however, totally different. » – Ibid.