Le Silurien supérieur et le devonien inférieur de la Sièrra de Guadarrama (Espagne Centrale). Troisième partie : éléments Icriodiformes, Pelekysgnathiformes et Polygnathiformes
The icriodiform, pelekysgnathiform and polygnathiform conodont elements from the Cercadillo Shales and Limestone are described. The icriodiform elements with one or two postero-lateral processes are assigned to three genera : Caudicriodus n. gen., Praelatericriodus n. gen., and Latericriodus MULLER, K. J . , 1 9 5 6 , herein modified. Caudicriodus forms the main branch from which Praelatericriodus in the Lower Gedinnian and Latericriodus in the Lower Emsian are derived.Caudicriodus? culicellus n. sp. is a newly described Upper Emsian - Lower Couvinian species. A number of species and subspecies described in this part and in the second part by P. BULTYNCK (1971) have been chosen in such a way that they form nine faunastic associations, which have a stratigraphical value, those are from oldest to youngest : I the Praelatericriodus rectangularis — Spathognathodus steinhornensis repetitor — Caudicriodus postwoschmidti — fauna (Lower Gedinnian); II the Praelatericriodus rectangularis — Caudicriodus curvicauda — fauna (Siegenian); III the Praelatericriodus simulator — fauna (Siegenian); IV the Caudicriodus celtibericus — fauna (Lower Emsian); V the Caudicriodus sigmoidalis — Polygnathus dehiscens — Spathognathodus steinhornensis miae — fauna (Lower Emsian); VI the Latericriodus bilatericrescens, Polygnathus dehiscens — Spathognathodus steinhornensis miae — fauna (Lower Emsian); VII the Icriodus fusiformis — 1. aff. I. corniger — I. rectirostratus — Caudicriodus ?culicellus — Polygnathus foveolatus (late forme) — fauna (Upper Emsian); VIII the Icriodus aff. /. fusiformis — I. corniger — 1. rectirostratus — Caudicriodus ? culicellus — Polygnathus foveolatus (late form) — fauna (Upper Emsian — Lower Couvinian); IX the Polygnathus serotinus — fauna (Upper Emsian — Lower Couvinian). Age assignements are based on the Brachiopods and on the association with Conodonts
