 |
 |
MarBEF Data System |
 |
|
|
|
WoRMS name details
original description
Heron-Allen, E.; Earland, A. (1913). Clare Island Survey: Part 64. Foraminifera. <em>Proceedings of the Royal Irish Academy.</em> 31 sect. 3: 1-188.
page(s): p. 122 pl. 10 fig. 8-10 [details] 
basis of record
Gross, O. (2001). Foraminifera, <B><I>in</I></B>: Costello, M.J. <i>et al.</i> (Ed.) (2001). <i>European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels,</i> 50: pp. 60-75 (look up in IMIS) [details]
From editor or global species database
Diagnosis Original diagnosis. Heron-Allen and Earland (1913, p. 122):
Test free, trochoid and conical, composed of three to four convolutions, in a depressed spire, with five or six chambers in the last convolution. Peripheral edge entire and usually somewhat thickened, occasionally slightly carinate.Still more rarely the marginal edge is lobulate, owing to the slight inflation of the segments. Sutures flush on the superior face of the shell, somewhat depressed on the base or inferior face, which is nearly flat, and furnished in the umbilical region with a solid stud of shell-substance: breadth varies from .15 to .4 mm.This is one of the innumerable types of D. rosacea; but as it does not appear to have been specifically described, in spite of its very distinctive appearance, we have thought it advisable to give it a name. It is one of the most characteristic types of the Clare Island area, and occurs in more or less abundance in nearly every dredging, as also in many "Goldseeker" dredgings and other British gatherings. It can hardly be confused with any other type if examined from the under-surface, the solid umbilical stud being a constant feature.There is no doubt that Williamson was familiar with this form, but he failed to separate it from his Rotalina nitida, the description of which, as we have already pointed out under that form, appears to have been based on a series of allied specimens. He states that "in some instances the inferior umbilicus is occupied by a distinct and prominent umbo." These specimens were, no doubt, our D. Praegeri. We have never seen any specimens of D. nitida presenting this feature, the nearest approach to it being the presence of a small tooth on each chamber projecting into the umbilical depression. By the coalescence of these teeth and-a raising of the height of the spire, D. nitida passes into D. Praegeri,We have much pleasure in associating this form with the name of Mr. R. Lloyd Praeger, but for whose perseverance and energy the authors would not have been induced to undertake and carry through their somewhat laborious task in connexion with the Clare Island Survey. [details]
From editor or global species database
|
|
|
|
|
Present