Table 1 Dimensions (in millimetres) of lechritrochoceratid embryonic shells, corresponding growth stage, age and source reference
From: Embryonic and early juvenile development in the Silurian basal nautilid Peismoceras Hyatt, 1894
Species | L | D | L/D | Growth stage | Series | References |
|---|---|---|---|---|---|---|
Kosovoceras sandbergeri (Barrande, 1865) | < 4, c. 5 | 2 | Adult | Uppermost Ludlow | Turek (1990) | |
Peismoceras pulchrum (Barrande, 1865) | 4.5 | 3 | 1.5 | Adult | Lowermost Ludlow | Turek (1990) |
Calocyrtoceras cognatum (Barrande, 1866) | 5 | 4 | 1.25 | Juvenile | Uppermost Ludlow | Turek (1990) |
Peismoceras scharyi sp. nov. | 7.5 | 3.8 | 1.97 | Juvenile | Upper Wenlock | New data |
Peismoceras asperum (Barrande, 1865), NM L 46908 | 7.5 | 3.4 | 2.21 | Juvenile | Lower Ludlow | New data |
Peismoceras asperum (Barrande, 1865), NM L 46909 | 6.6 | 2.9 | 2.28 | Early sub-adult | Lower Ludlow | New data |