Protozoa - Spumellaria - Tritrabidae

Named by P. Dumitrica.

Original description: Rays equal in length, slender, spindle-shaped, increasing slowly in diameter up to the distal third, then decreasing to terminate in a pointed tip. Sometimes there are 2 lateral spines in the equatorial plane originating in the transverse ridges of lateral faces. Rays approximately octagonal in cross-section, with 8 rows of pores separated by 8 longitudinal beams. Pore frames rectangular but of two types: those on oblique faces are simple whereas those on upper, lower and lateral faces have high transverse ridges and 2 pores in each rectangle separated by the branches of the primary ray which form the 4 canals. One row usually o&64256;set with pore frames of neighbouring rows. All vertices of pore frames pointed. Central area large and triangular outlined by three beams that connect the two longitudinal beams on the face of each ray.

Original remarks: Archaeotritrabs hattorii di&64256;ers from A. gracilis Steiger in having spindle-shaped rays with pointed tips, and lacks nodes on rays. The triangular area in the center of shell is a characteristic also known in Tritrabs casmaliaensis (Pessagno). In the latter species the triangle has one cortical beam in each corner, whereas A. hattorii has two. All other characteristics, except the microsphere, di&64256;er in these two species. The central part of the test of A. hattorii is very thin, the cortical shell in the center of the triangular area includes the top and the bottom of the microsphere as illustrated for Tritrabs and the Tritrabidae (Dumitrica in De Wever et al., 2001).

Etymology: The species is named for Dr. Isamu Hattori, Geological Laboratory, Fukui University, Japan, to honour his valuable contribution to the knowledge of Jurassic radiolarians of Japan.

Full reference: S. Gorican, E. S. Carter, P. Dumitrica, P. A. Whalen, R. S. Hori, P. De Wever, L. O'Dogherty, A. Matsuoka, and J. Guex. 2006. Catalogue and systematics of Pliensbachian, Toarcian and Aalenian radiolarian genera and species 446

Belongs to Archaeotritrabs according to S. Gorican et al. 2006

Sister taxon: Archaeotritrabs gracilis

Type specimen: pl. ATT01, fig. 3.

Ecology: passively mobile planktonic omnivore

Distribution: there are no occurrences of Archaeotritrabs hattorii in the database

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Specimen images are retrieved through the ePANDDA API.