Sonniniidae Ammonitina, Middle Jurassic from Southern Spain: taxonomic, biostratigraphical and palaeobiogeographical analysis
Author
Sandoval, José
text
Geodiversitas
2022
2022-09-15
44
27
801
851
journal article
158824
10.5252/geodiversitas2022v44a27
835cc227-e5c4-4453-a956-07a154f8fa5f
1638-9395
7150329
urn:lsid:zoobank.org:pub:E4896081-9312-4EA6-AE33-AAC44201748E
Sonninites felix
Buckman, 1923
[M]
(
Fig. 9
E-G)
Sonninites felix
(
in pars
)
Buckman, 1923
: T.A. 5, pl. 428A (HT),
non
pl. 428B (corresponds to
Sonninia corrugata
(
Sowerby, 1824
))
.
Sonninia
aff.
felix
–
Gillet 1937: 35
, pl. 4, fig. 4.
Sonninia felix
–
Fernández-López 1985: 54
, pl. 8, figs 2, 3.
Sonninia
[“
Sonninites
”] aff.
felix
–
Dietze
et al.
2009: 25
, pl. 8, figs 1-3,
non
fig. 4, pl. 11, fig. 3.
Sonninia
[“
Sonninites
”]
felix
–
Dietze
et al.
2011a: 213
, pl. 6, fig. 6.
Sonninia
(
Sonninites
)
felix
[M] –
Chandler 2019: 777
, fig. 16, b1-b2.
?
Sonninia carinodisca
–
Dietze
et al.
2020: 68
, pl. 15, fig. 1.
MATERIAL
EXAMINED. —
JAC3.83.1
,
JAC3.91.2
,
JAC3’.4.30
,
JAC3’.10.1
,
JAC3’.13.1
,
JAC4.68.3
,
JAC4.
R
.21
,
JAC20.
R
.1
,
JAC21.12.8
,
JAC21.12.9
,
JAC21.13.1
,
JAC21.13.2
,
JAC21.13.4
,
JAC21.14.1
,
JAC21.15.3
,
JAC21.16.1
,
JAC21.17.2
,
JAC21.17.3
,
JAC21.17.4
,
JAC21.18.1
,
JAC21.18.2
and
JAC22.(70-80).3.
MEASUREMENTS. — See
Table 9.
DESCRIPTION
Large discoidal shells of moderately involute coiling, with intermediate whorls more involute than the internal or external ones. Inner whorls have a subrectangular whorl section. The intermediate ones have a compressed ogival (oval) section, with the maximum width located near the middle part of the flanks, which are weakly convex. The umbilical wall is low, subvertical or strongly sloping and the ventral region is ogival, with a narrow, high and hollow keel. Ornamentation varies throughout ontogeny. In the internal whorls with furcate ribs, the splitting point of the ribs coincides with a thickening near the umbilical edge, and subsequently the division point gradually becomes more external. In the intermediate whorls, the ribbing is subradial or slightly sigmoid, bending forward on the outer side of the flanks, irregular in relief, fasciculate in two or three at variable height in the lower half of the flanks. Simple ribs (
c.
40-50 mm
in diameter) are common, slightly flexuous, rectiradiate, and prominent in the inner half of the flanks, but weaker and curved forward in the outer half. In addition, some weaker intercalatory ribs appear, and finally, on the end portion of the
PH
and in the BC of adult specimens, the ribbing is extremely attenuated, or even absent, and the ornamentation diminishes to weak undulations and growth lines or striae. The septal suture is relatively complex, with highly branched L and U
2
that are wide and not deep, whereas the E-L and L-U
2
saddles are rather narrow, and the umbilical lobes are weakly retracted.
TABLE 9. — Measurements of
Sonninites felix
Buckman, 1923
[M].
Specimen
|
D
|
U
|
u
|
H
|
h
|
W
|
w
|
Remarks
|
Biostratigraphy
|
JAC3.91.2 |
46.0 38.0 |
11.0 8.5 |
0.24 0.22 |
20.0 17.0 |
0.43 0.45 |
– – |
– – |
Incomplete |
JAC3’.10.1 |
64.0 |
13.5 |
0.21 |
31.0 |
0.48 |
– |
– |
44.0 |
10.0 |
0.23 |
22.0 |
0.50 |
– |
– |
JAC21.13.1 |
140.0 105.0 |
40.0 27.0 |
0.29 0.26 |
60.0 44.5 |
0.43 0.42 |
26.0 19.0 |
0.19 0.18 |
Complete adut |
Propinquans Zone |
JAC21.16.1 |
67.0 |
14.5 |
0.22 |
31.5 |
0.47 |
– |
– |
59.0 |
12.0 |
0.20 |
28.5 |
0.48 |
– |
– |
Incomplete |
JAC21.17.3 |
58.0 |
11.5 |
0.20 |
30.0 |
0.52 |
– |
– |
specimens? |
41.0 |
9.0 |
0.22 |
20.0 |
0.49 |
– |
– |
REMARKS
Sonninites celans
Buckman, 1924
(Buckman 1924: T.A. 5, pl. 461) is more involute, mainly in intermediate whorls, and has more radial ribbing. “
Dundryites
”
albidus
Buckman
and “
Sonninites
”
simulans
Buckman
(here considered synonymous and ascribed to the genus
Witchellia
) have similar ribbing on median and external whorls, but have no tuberculate inner whorls and a rectangular whorl section, with a tabulate venter.
Sonninia
(
S.
)
corrugata
(
Sowerby, 1824
)
has similar inner whorls, but is smaller, has more persistent ribbing, and is slightly more evolute.
Dorsetensia subtecta
Buckman, 1892
(in
Buckman 1887
-1907: 309, pl. 55, only pl. 54, figs 3-5, here included as synonymous of
Dorsetensia liostraca
) has quite similar coiling and ornamentation on the outer whorls, but its ribbing sharply differs on inner whorls, it lacks tubercles, and its umbilical wall is not subvertical.
DISTRIBUTION
According to
Chandler
et al.
(2006: 369)
the HT of
Sonninites felix
(Buckman, 1923)
comes from the Sauzei (Propinquans) Zone, Patella Subzone, Bj-11a horizon, Inferior Oolite at South Main Road Quarry, Dundry, Avon (
England
). Recently, Dr R. B. Chandler (pers. communication) indicated the exact stratigraphic horizon from which the HT of
So. felix
came (i.e. the
Stephanoceras rhytum
horizon, Bj-12, top of the Sauzei = Propinquans Zone). In
England
, this species is present also in the horizon Bj-11b (
Dietze
et al.
2011a
). In
Germany
,
So. felix
and
So.
aff.
felix
occur in the Macrum horizon, in the upper part of the Propinquans (Sauzei) Zone (
Dietze
et al.
2009
,
2011a
, b). In La Baume (Castellane area, SE
France
),
So.
cf.
felix
occurs in the Propinquans Zone (
De Baets
et al.
2008
). In the Iberian Cordillera (
Spain
), the species is common in the lower and middle parts of the Sauzei (Propinquans) Zone (Fernández-López 1985). In the Subbetic, it occurs in the Propinquans Zone, being especially abundant in Sierra de Alta Coloma area (sections, JAC3, JAC3’, JAC4, JAC11, JAC21 and JAC.22; Jaén Province).