Trilacertus Cheng, 1986

Noble, Paula, Aitchison, Jonathan C., Danelian, Taniel, Dumitrica, Paulian, Maletz, Jörg, Suzuki, Noritoshi, Cuvelier, Jessie, Caridroit, Martial & O’Dogherty, Luis, 2017, Taxonomy of Paleozoic radiolarian genera, Geodiversitas 39 (3), pp. 419-502 : 463-464

Trilacertus Cheng, 1986

Trilacertus Cheng, 1986: 177 .

TYPE SPECIES. — Trilacertus baumgartneri Cheng, 1986 ( Cheng 1986: 178, pl. 2, fig. 4, 8, 10, 12, 16, 19).

AGE AND LOCATION OF TYPE MATERIAL. — Lower Carboniferous, Oklahoma and Arkansas, USA.

TAXON CODE. — 187.

STATUS. — Junior synonym of Latentifistula Nazarov & Ormiston, 1983b (by Maldonado & Noble 2010).

DIAGNOSIS. — “Test as with family composed of three rays occurring in a plane. Cortical shell composed of labyrinthine meshwork with hollow bars and irregular pores. A “patagiumlike” structure may or may not be present between rays forming a triangular outline. Medullary shell composed of centrally placed, discoidal latticed shell and a medullary ray. Medullary rays composed of latticed meshwork with hollow bars and predominately elliptical pores; rays circular in axial section, forming an elongate canal along the ray axis. Medullary rays sometimes merging at distal portion of ray, naked without cortical shell, surrounding and appearing to be continuous, terminating in solid spine of cortical shell. Latticed central medullary shell and medullary rays connected by secondary radial beams to cortical shell.” ( Cheng 1986: 177).

REMARKS

Cheng’s specimens of Trilacertus look like exceptionally well preserved examples of the Carboniferous genus Latentifistula and are included herein. See remarks under Latentifistula .