Lower Tithonian mono- and dicyrtid Nassellaria (Radiolaria) from the Solnhofen area (southern Germany) Author Dumitrica, Paulian Institut de Géologie et Paléontologie, BFSH 2, UNIL, CH- 1015 Lausanne (Switzerland) Paulian. Dumitrica @ igp. unil. ch umitrica@igp.unil.ch Author Zügel, Peter Geologisch-Paläontologisches Institut, Johann Wolfgang Goethe-Universität, Senckenberganlage 32 - 34, D- 60054 Frankfurt am Main (Germany) zuegel @ em. uni-frankfurt. de. text Geodiversitas 2003 25 1 5 72 journal article 10.5281/zenodo.5372196 1638-9395 5372196 8BF4D0FF-F247-4B92-B327-0D647B01C386 Napora pyramis n. sp. ( Fig. 29J, K ) HOLOTYPE . — Photo No. 13759; Musée de Géologie , Lausanne, No. 74418 ( Fig. 29J ). ETYMOLOGY. — From the Latin pyramis : pyramid. MATERIAL EXAMINED. — Four illustrated specimens of which two from the type horizon (sample Mue 22), one specimen from sample Mue 9, and another one from sample Hob 32. DIMENSIONS ( IN µM). — Total length 175-195 (av. 185), length of apical horn 43-49 (av. 47), of cephalis 23-37 (av. 30), of thorax 45-60 (av. 55), of feet 53-61 (av. 58), total width 105-120 (av. 115), width of cephalis 38-45 (av. 41), of thorax 90-100 (av. 95). DESCRIPTION Test subpyramidal with a robust, apical horn. Proximal part of apical horn three-bladed; blades thick externally, broader terminally, each one with two very short thorns or only with a transversal blade; distal part conical, generally longer than the proximal part. Cephalis globular, smooth, poreless. Ventral spine very weakly marked externally. Thorax well distinguished from cephalis, subpyramidal, with four or six transverse rows of circular pores. Pores usually in square pattern distally, decreasing in size proximally and infilled toward the collar stricture. Feet usually shorter than thorax, very slightly curved, their external blade forming edges on the distal part of thorax. Velum very short when present. REMARKS This species is very close to Napora burckhardti from which it differs by short and rather straight feet and a pyramidal thorax. From N . pyramidalis Baumgartner, 1984 it differs in having a distinct smooth cephalis and a pronounced collar stricture because of the sudden inflation of the thorax.