Type species:Tricolocapsa fusiformis Yao (OD)
Description:Tricyrtid to tetracyrtid, ovoidal to shortly spindle-shaped. Small cephalis poreless or with very small pores. Segments outside not separated each other. Sutural pore distinct. The short appendix has the form of an inversely conical small additional segment at the distal end. It has the same wall structure and pore size as the post-cephalic segments, but it is always separated from the distal segment by a ring of very large pores.
Remarks:Several species from the Bajocian of the Bukk Mts. will be described in an other paper. Striatojaponocapsa n. gen. is distinguished by the presence of uninterrupted longitudinal ribs on the whole wall. Yaocapsa n. gen. has a short, tubus-like distal prolongation with big pores that is not separated by a row of very big pores from the distal segment. De Wever (in De Wever et al., 1979) figured typical Japonocapsa species as Tricolocapsa A, B, C from the sample XPF 30 that he placed in the Norian. As already mentioned above, this sample seems to represent a Bajocian sample with reworked Triassic radiolarians, because it contains typical Jurassic or even Bajocian species and genera together with Upper Triassic ones.
Typical representatives of the trisegmented Tricolocampe Haeckel 1881a emend. are quite unknown from the Triassic. Such typical representatives of this genus were figured as Eucyrtidium (?) sp. aff. (resp. cf.) E. ptyctum Riedel and Sanfilippo by De Wever, 1979 (pl.6, figs.1, 2). The genus Hsuum Pessagno, 1977b, not present before the Lower Pliensbachian, is also present in this sample. The documentation of Hsuum sp. cf. obispoensis Pessagno, 1977b by De Wever 1979 is very poor, but it seems to be a Hsuum. Williriedellidae Dumitrica, 1970 were also reported by De Wever, 1979 from the sample XPF 30. He determined these species as Cryptamphorella conara (Foreman) , Dicolocapsa sp. aff. D. verbeeki Tan Sin Hok and Dicolocapsa sp. Neither the species nor the genus determinations are correct, but at least "Cryptamphorella conara" (Foreman) is a typical representative of the Williriedellidae Dumitrica that are unknown before the Toarcian.
Stratigraphic range:Bajocian, Middle Jurassic, Mesozoic.
Etymology:According to the frequent occurrence in the Middle Jurassic of Japan.
Subsequent descriptions:?

Description and dimensions:Shell of four segments, fusiform. Cephalis spherical, poreless, partly depressed in thoracic cavity. Thorax truncate-conical, porous with indistinct stricture externally at thorax-abdomen joint. Abdomen subspherical, sparsely pored with thick wall and smooth surface. Abdominal base flat with a large central opening. Fourth segment dish-like, sparsely pored, with thin wall, and large pores at proximal part.       (Based on 10 specimens) Height overall 95-130µm, of cephalis 18-23µm, of thorax 18-28µm, of abdomen 38-87µm, of fourth segment 15-25µm, maximum width of shell 72-96µm. Remarks:This species is distinguished from other species of Tricolocapsa by having the fourth segment which is dish-like and covers the abdominal central opening. In the same sence [sic ?] as in Diacanthocapsa (?) operculi Yao described above, it is not clear whether the fourth segment of this species is certainly an independent one or not. Repository:Holotype: OCU MR 2235 (IN 7-9), and paratype: OCU MR 2238 (IN 7-9), Department of Geosciences, Osaka City University, Japan. Type locality:Manganese carbonate ore, Mino Belt, river side of the Kiso, east of Unuma, Kagamihara City, Gifu Pref. Central Japan.

Original stratigraphic range:Mesozoic.
Etymology:From the Latin fusiformis = fusiform.
Subsequent descriptions:?

Literature cited:- De Wever, P., A. Sanfilippo, W.R. Riedel, and B. Gruber (1979). Triassic radiolarians from Greece, Sicily and Turkey. Micropaleontology 25(1): 75-110.
- Dumitrica, P. (1970). Cryptocephalic and cryptothoracic Nassellaria in some Mesozoic deposits of Romania. Revue roumaine de Géologie, Géophysique et Géographie (série Géologie) 14(1): 45-124.
- Haeckel, E. (1881a). Entwurf eines Radiolarien-Systems auf Grund von Studien der Challenger-Radiolarien (Basis for a radiolarian classification from the study of Radiolaria of the Challenger collection). Jenaische Zeitschrift für Naturwissenschaft, 15:418-472.
- Kozur, H. (1984a). New radiolarian taxa from the Triassic and Jurassic. Geologisch - Paläontologische Mitteilungen Innsbruck 13(2): 49-88.
- Pessagno, E. A. (1977b). Upper Jurassic Radiolaria and radiolarian biostratigraphy of the California Coast Ranges. Micropaleontology 23(1): 56-113.
- Yao, A. (1979). Radiolarian fauna from the Mino Belt in the northern part of the Inuyama Area, Central Japan, Part II: Nassellaria I. Journal of Geosciences, Osaka City University 22: 21-72.