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Baculites chicoensis

Cephalopoda - Ammonitida - Baculitidae

Taxonomy
Baculites chicoensis was named by Trask (1856) [originally spelled as "Baculite chicoensis"].

Sister species lacking formal opinion data

Synonymy list
YearName and author
1856Baculites chicoensis Trask p. 93 figs. pl. 2, fig. 2
1864Baculites chicoensis Gabb p. 80 figs. PI. 17, Fig. 27, and 27 a; PI. 14, Fig. 27. b, and 29, and 29 a
1917Baculites chicoensis Waring p. 69 figs. Pl. 9, Fig. 11
1940Baculites chicoensis Taff et al. p. 1321 figs. Plate 1, figures 3, 4
1959Baculites chicoensis Matsumoto p. 145 figs. Pl.36, fig.2a-d; Pl.37, fig.1a-d; Text-fig. 59a-d, 60a,61a, b,62a, b,63a, b

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
classCephalopodaCuvier 1797
RankNameAuthor
subclassAmmonoidea()
orderAmmonitida
suborderAncyloceratinaWiedmann 1966
superfamilyTurrilitoidea(Gill 1871)
familyBaculitidaeGill 1871
genusBaculitesLamarck 1799
specieschicoensis

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 chicoensis Trask 1856
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Diagnosis
ReferenceDiagnosis
T. Matsumoto 1959The tapering of the shell is fairly rapid in the earlier growth-stages, and slow in the later. The shell can attain moderate size; the largest example is slightly over 25 mm. in height (i.e. longer diameter) and at least 130 mm. in length of the body chamber. The cross section is ova1, being somewhat higher than broad and broadest at the point slightly below (i.e. dorsally from) the mid-flank. The flanks are moderately inflated; the dorsal area is broadly rounded; the ventral area narrowly rounded. In the Iater growth-stages, a low elevation is developed on the mid-venter, being bordered on its both sides by very shallow grooves, thus forming a blunt ventral keel. The surface of the shell is nearly smooth, but with faint striae and growth- lines. On the body chamber, weak riblets are occasionally discernible along witll the striae. These ornaments show a deep sinus on the dorsal half of the nank, a strong projection on the venter, and a much weaker projection on the dorsal area. The suture is finely and fairly deeply incised, especially so in the later growth-stages. The external lobe is broader and shallower than the lateral lobes;the siphonal saddle low and broad;the external saddle(between E and L) relatively narrow;the lateral saddle (between L and U)slightly higher than others. The first lateral lobe (L)is nearly as deep as, but narrower than, the second lateral lobe(U). The former is symmetrically bi6d;the latter rather asymmetrically so. The antisiphonal Iobe(1)is very small, sitting on the united antisiphonal saddles, as if it was a divide of one saddle. All the elements (except I) are inverse trapezoidal in general outline, forming a dovetail. The median divide at the bottom of L is fairly large, being higher than the lateral divides on both sides of it. This difference in size and height of divides is still more distinct at the bottom of U.