Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis) Author Lobban, Christopher S. Division of Natural Sciences, University of Guam, Mangilao, GU 83823, USA e-mail: clobban @ guam. net clobban@guam.net text Micronesica 2015 2015 2 1 49 journal article 299054 10.5281/zenodo.12117576 9ec266f5-1dc7-4272-9fbc-67c7f2b0f5aa 0026-279X 12117576 Cocconeis ornata W. Gregory Figs 22–26 Ref. illus.: Gregory 1857 , pl. IX (1), fig. 24; Peragallo & Peragallo 1897 –1908, pl. 4, figs 13–15; Montgomery 1978 , pl. 61, figs A–D; Riaux-Gobin et al. 2014 , figs 9–14 Samples: GU44AU-2 Dimensions: Length 19 µm, width 15 µm, striae ca 10 in 10 µm Diagnostics: SV: striae coarsely uniseriate but sometimes branching towards the margin, striae interrupted by a longitudinal hyaline line; margin with parallel rows of papillae. RV not seen. Comments: A few specimens in this sample. Gregory (1857) was charmed by the “rich ornate aspect” of this “beautiful” species, which does indeed appear ornate, especially in SEM ( Fig. 27 ). The original drawing did not do it justice.