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The study of the cephalic capsule of Cae(,o.l'p/ltleroma hurgunt/um. a subterranean walers Isopod. demonstrates improved adaptations to volvation; these concern in a similar manner the other regions of the body. particularly the pleotelson. From a primitive a4uatic Isopod structure. the head of this blind Spheromid has been completely fashioned by many mechanical factors: posterior margin of pleotelson providing support on the head. relation of anterior angles of the second pereionit and. above all. the mandihular palps and antennae which retract into two deep grooves of the face. The comparative study of the head of other volyalional Isopods shows the importance of that "antennary factor". e.g. in Oniscoids. epigean Spheromids and some other subterranean waters Isopods (two Spheromids and one Cirolanid). This comparison shows that Caeco.l'p/Itleroilltl hurg/ilu/ulII is certainly the most specialized of all; it approaches perfection in volvation for it is the only one which rolls up into an hermetic sphere without outwards projections. Volvation seems to playa two-fold role. It is a means of defense against predators used hy single specimens and by copulating pairs. 0 and « being then associated in two concentric spheres. Furthermore. it is a very important way for passive dissemination allowing settlement of these Crustacea in distant subterranean waters.

Les adaptations à la volvation du squelette externe de la tête chez Caecosphaeroma burgundum Dollfus, Crustacé Isopode des eaux souterraines