By Jones R.W.
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Morphogroup C is characterised by an elongate morphology and a low surface-area to volume ratio, and by an infaunal life position, and a detritivorous feeding strategy. Morphogroup D is characterised by a conical morphology, and by an epiphytic life position, and a herbivorous feeding strategy. 18 Biology, morphology and classification (a) (g) (d) (b) (h) (f) (e) (c) (c) (i) (j) Morphogroup A (m) (n) (l) (k) (o) (p) (q) (r) Morphogroup B (s) (x) (w) (t) (u) (y) (t) (v) (x) (y) Morphogroup C Morphogroup D Fig.
Modified after Haynes (1981). 7 Valvulina triangularis, ×33. 30 Biology, morphology and classification 4 1 2 3 5 6 7 Pl. 9 Eggerellidae. 7 Plectotrochammina subglobosa, ×50. High trochospiral; small to large, with or without complex interior; aperture ‘bulimine’: Family Ataxophragmiidae (Jurassic–Recent). Representative genera: Arenobulimina (Pl. 1), Ataxophragmium, Eggerellina (Pl. 3), Eggerelloides, Kurnubia, Migros (Pl. 5), Pfenderina, Pseudobolivina (Pl. 6), Remesella, Tritaxilina. Essentially high trochospiral to uniserial; large, with complex interior; apertures multiple: Family Orbitolinidae (Jurassic–Palaeogene).
30 Biology, morphology and classification 4 1 2 3 5 6 7 Pl. 9 Eggerellidae. 7 Plectotrochammina subglobosa, ×50. High trochospiral; small to large, with or without complex interior; aperture ‘bulimine’: Family Ataxophragmiidae (Jurassic–Recent). Representative genera: Arenobulimina (Pl. 1), Ataxophragmium, Eggerellina (Pl. 3), Eggerelloides, Kurnubia, Migros (Pl. 5), Pfenderina, Pseudobolivina (Pl. 6), Remesella, Tritaxilina. Essentially high trochospiral to uniserial; large, with complex interior; apertures multiple: Family Orbitolinidae (Jurassic–Palaeogene).