bifrons


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bifrons

bifrons
Having two fronts or faces looking in opposite directions, as a double herm.
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As only visual evaluations of behavior for Equichlamys bifrons were available, the PCA for morphology and behavior used data for Amusium balloti, Placopecten magellanicus, Pecten fumatus, Mimachlamys asperimma, and Crassadoma gigantea.
Swimming capacity of all species except Equichlamys bifrons and C.
7), as constituent of the "Spanish Bioprovince" of brachiopods occurring in the Serpentinum-lower Bifrons zones.
The gastropods Ptychocerithium johannae, Diastoma costellatum, Haustator imbricatarius, and the bivalves Spondylus bifrons, Spondylus nysti, Spondylus planicostatus and Chamapellati, among other molluscs, are present in the Paleogene series of the Basque Coast, in the surroundings of the town of Biarritz, specifically in the outcrops of Villa Marbella and of the upper part of the Cote des Basques (BartonianPriabonian, Cote des Basques Marls Formation, Mathelin and Sztrakos, 1993; Sztrakos et al.
Spondylus caldesensis, Spondylus bifrons and Spondylus nysti are present in several sites of Igualada, Manresa and Vic regions, in the Igualada Formation (late Bartonian, most likely Priabonian in age, Taberner et al.
Last, Equichlamys bifrons (Lamark 1819) is supposedly more sedentary than M.
An additional species, Equichlamys bifrons, was collected with and kept in the same conditions as P.
In this paper, Middle Toarcian rocks (higher serpentinum Zone, bifrons Zone) were studied only in the Maria Pares section (Z) and the Barranco de la Canada section (C).
Further evidence for oxygen deficiency is given by the Bositra buchi-assemblage occurring in the bifrons Subzone (Middle Toarcian) of the Maria Pares section.
opalinum opalinum TOARCIAN Upper aalensis levesquei pseudoradiosa dispansum thouarsense thouarsense Middle variabilis variabilis bifrons bifrons Lower serpentinus falciferum tenuicostatum tenuicostatum PLIENSBACH.