. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. adcauline larger abcauline larger hinge adcauline hinge abcauline PYRAMID-SHAPED 2 VALVES; 2 TEETH 1 VALVE Fig. 79. Sertulariidae: marginal and opercular valves (adcauline side on right). In addition to the marginal teeth some species have internal teeth formed by pegs of perisarc projecting into the cavity of the hydrotheca just below the margin. These are particularly prevalent in Sertularella, where in certain cases their presence or absence, number and position may be diagnostic for the sp
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. adcauline larger abcauline larger hinge adcauline hinge abcauline PYRAMID-SHAPED 2 VALVES; 2 TEETH 1 VALVE Fig. 79. Sertulariidae: marginal and opercular valves (adcauline side on right). In addition to the marginal teeth some species have internal teeth formed by pegs of perisarc projecting into the cavity of the hydrotheca just below the margin. These are particularly prevalent in Sertularella, where in certain cases their presence or absence, number and position may be diagnostic for the species. The mouth of the hydrotheca is closed by an operculum consisting of one or more valves hinged at the edge. In genera with three or four marginal teeth a similar number of valves is seated in the bays between them and meet in the centre to form a pyramid, Sertularella, Symplectoscyphus, Thyroscyphus. Genera with two marginal teeth, as for instance Sertularia, Amphisbetia and Dynamena, have an operculum of two valves of unequal size attached at the ad-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
