LARNACILLIDAE Haeckel, 1884

Zhang, Lanlan & Suzuki, Noritoshi, 2017, Taxonomy and species diversity of Holocene pylonioid radiolarians from surface sediments of the northeastern Indian Ocean, Palaeontologia Electronica (Cambridge, England: 2003) 7 (8), pp. 1-68 : 41

Family LARNACILLIDAE Haeckel, 1884 (non 1887) sensu emend. Dumitrica, 1989

Remarks. In contrast to the Pyloniidae , the Larnacillidae lack an S1a-girdle in their central combinations. The detailed frame structure of this microsphere is shown in Dumitrica (1989, figure 5.A-F). The Larnacillidae have girdles or cupolas on both sides of the S1a (microsphere). A pillar beam always extends from both sides of S1a along the Lt-axis in Type 1 coordinates. The Lt-axis is defined as the longest axis of the G1 girdle/cupola that attaches directly to S1a. The Pl-axis is orthogonal to the Lt-axis and passes through the G2 girdle/cupola. In many cases, identical girdles or cupolas are placed on opposite sides and arranged to be mutually perpendicular to each other. A set of four (or six) cupolas/girdles makes a pseudo-concentric shell.