Amphiroa sp.

Dey, Rikee, Basso, Daniela, Chakraborty, Arindam, Roy, Lopamudra, Bhaumik, Ajoy Kumar & Ghosh, Amit K., 2023, Rhodolith-forming coralline red algae in the CaCO biofactory - A case study from the Serravallian of tropical northeastern Indian Ocean, Comptes Rendus Palevol 22 (26), pp. 541-567 : 551

Amphiroa sp.

( Fig. 4 G-J)

DESCRIPTION

The intergenicular segments measure 651 to 1109 µm in length and 256 to 338 µm in diameter. Core region is composed of 3 to 6 layers of long cells alternating with 1 to 2 layers of short cells. Peripheral region not observed. Long cells measure 50 to 90 µm in length and 8 to 20 µm in diameter, short cells are 16 to 40 µm in length and 9 to 19 µm in diameter. Conceptacles are not preserved ( Table 1 ).

REMARKS

The species of Amphiroa described herein is comparable to Amphiroa fragilissima (Linnaeus) Lamouroux illustrated by Johnson (1957) from the Pleistocene of Mariana limestone, Saipan. The characteristic features of A. fragilissima as defined by Johnson (1957) are the core region comprises of 3 to 6 layers of long cells alternating with 1 to 2 layers of short cells. However, the specimens described here show larger size of both long and short cells are. Moreover, owing to lack of preservation of conceptacles, the presently described form is not assignable to any known species of the genus.