Table 1 Morphological comparison of genera in Antiphyllinae Ilina, 1970 present in the Aheimer Formation, western side of Gulf of Suez, Egypt including Bradyphyllum Grabau, 1928 for comparison with morphologically close Lytvolasma Soshkina, (based on Fedorowski, 1987a and Chwieduk, 2013)
Genus | Cardinal septum | Cardinal fossula | Counter septum | Alar septa | Major septa | Minor septa |
|---|---|---|---|---|---|---|
Actinophrentis Ivanowski, 1967 | Thin, some-what short, shortened on calice floor | Narrow, its axial end reaching or almost reaching corallite axis, narrowing adaxially | Moderately to distinctly elongated | As long as other major septa, or slightly elongated | Thickened to contiguity in early growth stages, pinnately arranged, almost reach corallite axis, in late growth stages contiguous in peripheral stereozone and wide axial structure | Very short |
Bradyphyllum Grabau, 1928 | Long in early ontogeny, shortened in maturity below calice floor | Triangular, not reaching corallite axis | Slightly elongated, at least in early ontogeny | Equal in length to adjacent major septa | Radially arranged, shortened to form free axial area | Very short |
Lytvolasma Soshkina, 1925 | in early growth stages long, in late stages slightly shortened | Open, deep, key-hole, often bordered by half-aulos in counter quadrants in late growth stages, weakly marked | As other major septa or slightly elongated at least in neanic stage | As long as other major septa, slightly elongated in neanic stage | Long, thickened, laterally contiguous over much of their length, somewhat curved to straight and almost reaching axis, in cardinal quadrants often thicker and grouped about fossula, pseudoradial | Very short, confined to narrow peripheral stereozone |
Monophyllum Fomichev, 1953 | Shortened on calice floor | Widened adaxially, reaching corallite axis | Elongated to form incipient columella | In neanic stage slightly elongated | Pseudoradial, often thicker in cardinal quadrants, straight | Underdeveloped |
Rotiphyllum Hudson, 1942 | Shortened on calice wall, long on floor | Reaching corallite axis, narrowing adaxially | More or less elongated | As long as other major septa in late stages, longest of quadrants in neanic stage | Radially arranged, dilated, with extra thickening in inner third of their length, joined to form dense axial structure | Short |