Pliensbachian corals from the Western Tethys
Author
Vasseur, Raphaël
Université de Lorraine, CNRS, lab. GeoRessources, UMR 7359, BP 70239, F- 54506 Vandoeuvre-lès-Nancy cedex (France)
raphaelvasseur@wanadoo.fr
Author
Lathuilière, Bernard
Université de Lorraine, CNRS, lab. GeoRessources, UMR 7359, BP 70239, F- 54506 Vandoeuvre-lès-Nancy cedex (France)
bernard.lathuiliere@univ-lorraine.fr
text
Geodiversitas
2021
2021-11-23
43
22
1187
1291
journal article
10.5252/geodiversitas2021v43a22
1638-9395
5764379
urn:lsid:zoobank.org:pub:6D1643AD-66A5-4678-9397-CE08E610D641
Margarosmilia dividenda
n. sp.
(
Fig. 36
)
urn:lsid:zoobank.org:act:
37CC44E3-55EF-4487-82C3-90E35002B5DA
TYPE
MATERIAL. —
Holotype
CPUN
Gu
1105E2-1. STUDIED SAMPLE. — CPUN
Gu
1105E2-1. ETYMOLOGY. — Referstothephacelo-thamnasterioidaspectofthecolony.
TYPE
HORIZON. —
Upper
Pliensbachian
(
Margaritatus
ammonite zone).
TYPE
LOCALITY. —
Guigou
plateau,
33°27’45”N
,
4°56’43”W
,
Middle Atlas
of
Morocco
. GEOGRAPHIC AND STRATIGRAPHIC RANGES. —
Upper
Pliensbachian
of
Guigou Plateau
(
Middle Atlas
of
Morocco
)
.
DESCRIPTION
Phacelo-thamnasterioid colony with rounded calices irregular in size and shape. Growth by intracalicular budding. Radial elements are compact, free or more often joined septa that are laterally sharply granulated. Trabecular microstructure. The inner edge of major septa sometimes join together in the axis of the calice. Endotheca made of thin vesicular dissepiments. Synapticulae not observed. An epitheca
s.l.
wraps the corallites. Calicular diameter:
5 to 17 mm
– Number of septa: 84 to 123 – Septal density: 5 for
2 mm
– Trabecular density: approximately 4 per
1 mm
.
FIG. 34. —
Spongiocoenia liasica
(
Turnšek & Geyer, 1975
)
,
n. comb.
:
A
, distal view of the specimen CPUN AM16178-2;
B
, distal view of the specimen CPUN AM16188-31;
C
, transverse thin section in the specimen CPUN DA3105E3-2;
D
, longitudinal thin section in the specimen CPUN DA3105E3-3;
E
, detail in distal view of the specimen CPUN AM16188-7;
F
, detail in longitudinal thin section of the specimen CPUN DA3105E3-3. Scale bars: A, D, 4 mm; B, 5 mm; C, 2 mm; E, 1 mm; F, 0.5 mm.
FIG. 35. —
Dimorphastrea
?
menchikoffi
(
Beauvais,1986
)
:
A
, distal view of the specimen MNHN.F.R11641;
B
, lateral view of the specimen MNHN.F.R11641;
C
, proximal view of the specimen MNHN.F.R11641;
D
, detail in distal view of the specimen MNHN.F.R11641;
E
, detail in distal view of the specimen MNHN.F.R11641. Scale bars: A, 4 mm; B, C, D, 1 cm; D, 5 mm; E, 3 mm.
SIMILARITIES AND DIFFERENCES
This taxon differs from all the other species in the genus by the phacelo-thamnasterioid aspect of the colony.