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Baculites boulei
Taxonomy
Baculites boulei was named by Collignon (1931).
Synonymy list
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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.
†Baculites boulei Collignon 1931
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. Matsumoto 1959 | The shell is relatively small， with slow tapering. The section is higher than l)road， and oval to subelliptical，with the siphonal more narrowly rounded than the antisiphonal area. The maximum breadth is somewhat on the antisiphonal side of the mid-flank.
On the dorsolateral part there are normally strong crescentic nodes or short but thick, arcua七e ribs, which fade at the middle of the Hank into the weak riblets. There are also intercalatory riblets. These riblets are developed on the siphonal half of the shell, being oblique on the Hank and projected strongly on the venter. They are often so weak that they are only discernible under oblique lighting. The antisiphonal extellsions of the major ribs quickly fade out， showing Iess pronounced forward curve on the dorsum. The tubercles or major, short ribs are moderately spaced， but the distance is occasionally irregular. Also the intensity of the tubercles varies irregularly. The nodes themselves are usually crescentic， but sometimes fairly rounded. The shells in the early grow七h-stage below 7-5 mm， in height are devoid of nodes. The suture is simple. The saddles are broad， subquadrate to subrectangular in general outline, and subequally bifid. E is wide; L is narrow and deep; U is shallower than L; I is very small. The minor dentations are small and shallow. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: base of the Coniacian to the top of the Early/Lower Campanian or 89.80000 to 70.60000 Ma
Collections (10 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Coniacian | USA (California) | Baculites boulei (72037) | |
| Coniacian - Santonian | USA (California) | Baculites boulei (200459) | |
| Santonian | USA (California) | Baculites boulei (69307 215315 224982 224983 224984) | |
| Early/Lower Campanian | Mozambique | Baculites boulei (174824 174825 174826) |