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 Cornutella tella n. sp. ( Fig. 24 D-H) HOLOTYPE . — Photo No. 45641; stub Mue 22/16; Musée de Géologie , Lausanne, No. 74402 ( Fig. 24D ). ETYMOLOGY. — Arbitrary combination of letters. MATERIAL EXAMINED. — 12 illustrated specimens and many other specimens not illustrated from the type horizon (sample Mue 22). DIMENSIONS ( IN µM). — Total length 180-235 (av. 210), length of apical horn and cephalis 50-130 (av. 85), of conical part of thorax 50-75 (av. 60), of inflated part 45-90 (av. 70); maximum width of cephalis at collar boundary 15-30 (av. 20), of conical part of thorax 45-65 (av. 60), of distal part 130-180 (av. 150). DESCRIPTION Test high conical with a widely inflated distal part. Cephalis very small, imperforate with a straight apical horn and a short ventral spine, both massive, circular in cross section. Collar boundary not marked outside. Thorax slowly increasing in diametre up to the distal part which is widely inflated, convex in outline as if moulding a spherical calotte. Most proximal part of thorax with infilled pores. Main part of thorax net-like with hexagonally framed pores arranged alternately in commonly 12 longitudinal rows. Size of pores gradually increasing distally. Distal part of test usually not completely developed, without rim, irregular, with thinner bars as if individuals died before completion. Only one specimen of about 20 shows a complete, garlandshaped terminal rim. In this specimen, however, the regular hexagonal pore pattern is strongly disturbed in the terminal pores. REMARKS Cornutella tella n. sp. differs from all species of Cornutella so far described by its expanded distal part resembling a spherical calotte.