FIGURES 1–6. Chelonicola costaricensis. SEM pictures taken from the holotype population from the olive ridley sea turtle carapace collected on Ostional Beach, Costa Rica. 1. Three frustules of Chelonicola attached to the substrate together with one frustule (upper one) of Poulinea. 2. Several valves of Chelonicola attached to the substrate showing their valve face and the girdle composition. 3. One frustule attached to the substrate by a mucilaginous stalk. The girdle structure composed of at least 10 bands is shown. 4. Valve face view showing the head pole with the distal raphe fissure continuing onto the mantle. 5. External detail of the central area showing the lack of fascia and the stria structure. 6. External detail of a head pole showing the distal raphe fissure. Scale bar represents 10 μm except for Figs 5, 6 where scale bar = 1 μm.

Published as part of Majewska, Roksana, Kociolek, J.P., Thomas, Evan W., Stefano, Mario De, Santoro, Mario, Bolaños, Federico & Vijver, Bart Van De, 2015, Chelonicola and Poulinea, two new gomphonemoid diatom genera (Bacillariophyta) living on marine turtles from Costa Rica, pp. 236-250 in Phytotaxa 233 (3) on page 241, DOI: 10.11646/phytotaxa.233.3.2, http://zenodo.org/record/13633146