TABLE 1. Comparison of known fossil species of Ricciaceae.
| Taxon | Rosette-forming | Thallus size |
Branch base | Number of dichotomies | Segment shape | Segment surface | Segment width | Ventral scale | Rhizoid | Age | References |
| Ricciopsis sandaolingensis sp. nov | yes | 26-37 mm in diameter | not fused | 4 | linear | narrow ridge | 1.9-3.7 mm | semi-circular | 13-19μm wide, unicellular | Middle Jurassic | this paper |
| Ricciopsis florinii | yes | 25 mm in diameter | fused | 3 | longth almost equal to width | median furrow | 1-3 mm | - | 23μm wide, unicellular or multicellular | Early Jurassic | Lundblad (1954) |
| Ricciopsis scanica | yes | 10 mm in diameter | fused | 2 | linear to wedge-shaped | ribs or striae | 1-1.5 mm | - | - | Early Jurassic | Lundblad (1954) |
| Ricciopsis grandensis | yes | 15 mm in diameter | fused | up to 3 | linear to wedge-shaped | strongly marked midrib | 1-2 mm | - | - | Early Cretaceous | Cladera et al. (2007) |
| Ricciopsis algoaensis | yes | 9 mm in diameter | fused | 6 | linear | median ridge | ca. 0.5 mm | - | - | Early Cretaceous | Anderson and Anderson (1985) |
| Riccia chitaleyii | yes | 6.5 mm in diameter | fused | 2 | linear to wedge-shaped | air spaces | - | - | - | Late Cretaceous | Sheikh and Kapgate (1982) |
| Riccia thongjaorokensis | yes | 75 mm in diameter | fused | up to 2 | linear | wide groove | 10 mm | - | - | Oligocene | Hemanta Singh and Kishor (2009) |
| Ricciopsis ferganica | no | up to 15 mm long, 7-13 mm wide | - | 3 | linear | median furrow | 0.9-2.2 mm | - | - | Middle-Late Triassic | Moisan et al. (2012) |
| Ricciopsis speirsae | no | up to 25 mm long | - | 7 | linear | narrow furrow or sulcus | 1.5-2 mm | - | - | middle Paleocene | Hoffman and Stockey (1997) |
