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Galeacornea causea (elaterate)
Description: Body ellipsoidal, 35 to 45 microns long, 24 to 32 microns wide, with a narrow slit-like aperture on the proximal surface extending nearly the full length of the body, and with a sheet-like crescent shaped flap crossing the distal surface diagonally. In lateral view, the proximal surface is somewhat less convex than the distal surface, but the latter is not strongly arched. Body surrounded completely by a zona having a more or less elliptical outline in proximaldistal view, and having its major axis oblique to that of the body. The zona, therefore, is wider (6 to 10 microns) across the narrow ends of the body than along its sides (2 to 5 microns), and the two halves of the zona are inverse mirror images of each other. Zona narrowest at the places where the proximal flap merges with it. Body wall consists of a single, homogeneous, unornamented layer, about 1 micron thick, to which an outer, distinctively textured wall, up to 3 microns thick, is attached on the proximal surface only. The equatorial edge of the outer wall is separated from the zona by a trough-like depression 2 to 3 microns wide (indicated by arrow on plate 1, figure 17b). Superficial layer of the outer proximal wall, of the zona and of the flap is smooth, but the core of the same structures is granular. In some specimens, one to four small, fingerlike projections or short ridges, textured like the core ofthe zona, arise from the distal surface, generally near the equator and/or close to the flap (see plate 2, figure 4). Over-all size of specimens from 44 to 60 microns in length, from 28 to 40 microns in width and up to 55 microns in height, including the flap.
Year | Name and author |
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1963 | Galeacornea causea Stover |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Age range: base of the Middle Albian to the top of the Cenomanian or 109.00000 to 93.90000 Ma
Collections (64 total)
Time interval | Ma | Country or state | Original ID and collection number |
---|---|---|---|
Albian | Peru (Loreto) | Galeacornea causea (144971) | |
Albian | Egypt (Matruh) | Galeacornea causea (137373) | |
Albian - Cenomanian | Nigeria (Maiduguri) | Galeacornea causea (139254 139255 139256 139257 139258 139259 139260 139263 139265 139266 139267 139268 139269 139271 139272 139273 139275 139277 139278 139279 139280) | |
Early/Lower Albian - Middle Albian | Brazil (Maranhao) | Galeacornea causea (142284 142285 142286 142287 142288 142289 142290 142291 142292 142293 142294 142295 142296 142297 142298 144244) | |
Middle Albian - Late/Upper Albian | Morocco (Tarfaya) | Galeacornea causea (144143) | |
Middle Albian - Early/Lower Cenomanian | Egypt (Western Desert) | Galeacornea causea (144955) | |
Late/Upper Albian - Cenomanian | Peru (Loreto) | Galeacornea causea (144972) | |
Late/Upper Albian - Early/Lower Cenomanian | Brazil (Maranhao) | Galeacornea causea (142277 142278 142279 142280 142281 142282 142283 144217 144221) | |
Late/Upper Albian - Middle Cenomanian | Nigeria (Gambe) | Galeacornea causea (144198) | |
Cenomanian - Turonian | Guinea-Bissau (São Domingos) | Galeacornea causea (137239) | |
Early/Lower Cenomanian | Egypt (Western Desert) | Galeacornea causea (142207 144959) | |
Late/Upper Cenomanian | Nigeria (Nikalagu) | Galeacornea causea (144570 144574) | |
Late/Upper Cenomanian | Brazil (Barreirinhas) | Galeacornea causea (144292 144295) | |
Late/Upper Cenomanian | Brazil (Sergipe) | Galeacornea causea (144288) | |
Late/Upper Cenomanian | Brazil (Maranhao) | Galeacornea causea (139464 142276) | |
Late/Upper Cenomanian | Nigeria (Gambe) | Galeacornea causea (144199) | |
Late/Upper Cenomanian | Egypt (Western Desert) | Galeacornea causea (142209) |