Napora matsuokai, Dumitrica & Zügel, 2003

Dumitrica, Paulian & Zügel, Peter, 2003, Lower Tithonian mono- and dicyrtid Nassellaria (Radiolaria) from the Solnhofen area (southern Germany), Geodiversitas 25 (1), pp. 5-72 : 61-62

Napora matsuokai n. sp. ( Fig. 29C, D )

HOLOTYPE. — Photo No. 54934; stub 22/17; Musée de Géologie , Lausanne, No. 74416 ( Fig. 29C ).

PARATYPE. — MNHN, bât. de Géologie, No. Gg 2001/2093.

ETYMOLOGY. — The species is named in honour of Dr. Atsushi Matsuoka (Niigata University, Japan) for his valuable contributions to the knowledge of Mesozoic radiolarians.

MATERIAL EXAMINED. — Seven specimens from the type horizon (sample Mue 22).

DIMENSIONS ( IN µM). — Total length 180-225 (av. 205), length of apical horn 42-53 (av. 48), of cephalis 23-31 (av. 26), of thorax 30-45 (av. 35), of feet 75- 110 (av. 90), total width 100-135 (av. 120), width of cephalis 35-45 (av. 40), of thorax 70-90 (av. 75).

DESCRIPTION

Cephalis large, globular, imperforate, with a thick three-bladed, gently tapering apical horn. At its middle part the horn bears on each blade two or three very small subsidiary spines. Distal part of horn also three-bladed. Dorsal blade extended downward on cephalic surface, lateral blades have their base on the top of cephalis. Ventral spine well developed externally, manybladed, pyramidal. Thorax pyramidal, well separated from cephalis externally, generally with five transverse rows of pores of which the distal ones are well marked. Feet longer than cephalothorax, slightly diverging and curved with distal end pointed. External blade of each foot forms a rib along thorax. Velum not preserved but some remains prove that it was originally present.

REMARKS

This new species resembles especially Napora lomoalta but differs from it by having simple blades on apical horn, cephalis practically imperforate and well distinguished from thorax, and feet curved.

Figures

FIG. 29. — A, B, Napora lomoalta Hull, 1997; A, right lateral view; B, view from Ll; C, D, Napora matsuokai n. sp.; C, holotype, left lateral view; D, paratype, left lateral view; E-G, Napora modesta n. sp.; E, holotype, dorsal view; F, G, paratypes; F, dorsal view; G, view from Lr; H, I, Napora pacifica Kiessling, 1999; H, view from Ll; I, view from Lr; J, K, Napora pyramis n. sp.; J, holotype; K, paratype; L-N, Napora schaudibergensis n. sp.; L, M, paratypes; L, dorsal view; M, view from Ll; N, holotype, view from Lr; O, Napora sp., left lateral view. Abbreviations: Ll, left primary lateral spine; Lr, right primary lateral spine. Scale bars: A, H, I, M, N, 100 µm; B-G, J-L, O, 30 µm.