Aretz et al_2011.pdf - ORBi - Université de Liège

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Kölner Forum Geol. Paläont., 19 (2011)
M. ARETZ, S. DELCULÉE, J. DENAYER & E. POTY (Eds.)
Abstracts, 11th Symposium on Fossil Cnidaria and Sponges, Liège, August 19-29, 2011
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Mode of life
According to the morphology of the corallum, the genus Angustiphyllum shares numerous characteristics
with 1) the Emsian Rugosa Combophyllum MILNE-EDWARDS & HAIME 1850 and 2) the Eocene-Recent
Scleractinia Flabellum LESSON 1831 and its mode of life could be similar.
The presence of costae and consequently the lack of the so-called epitheca indicates that the polyp was
fully covered with living tissue. Thus, Angustiphyllum belongs to the automobile free living coral group and
was probably able to move (lateral migration) on the soft bottom of the Saint-Fiacre sea, or at least capable
of vertical movement to right or exhume itself (PLUSQUELLEC et al. 1999).
The sedimentological/sequential study of the Lochkovian to Famennian formations of the Rade de Brest
(GUILLOCHEAU 1991) shows that the maximum flooding surface occurs in the Eifelian during the deposit of
the Saint-Fiacre Formation (mainly dark shales with a middle level of nodular limestones). The
environment varies from lower offshore to distal upper offshore.
Paleobiogeography
The genus Angustiphyllum is known in the Eifelian of the Cantabrian Mountains and in the western part of
the Massif Armorican, the two areas forming the Ibero-armorican Domain situated on the north-western
margin of the Gondwana on the shelf of the Rheic Ocean.
ALTEVOGT, G. (1965): Die systematische Stellung von Angustiphyllum cuneiforme n. gen. n. sp., einer eigenartigen
Tetrakoralle aus dem Mittledevon Nordspaniens. – Paläontologische Zeitschrift, 39 (1/2): 84-93.
GUILLOCHEAU, F. (1991): Modalités d’empilement des séquences génétiques dans un bassin de plate-forme (Dévonien
armoricain): nature et distorsion des différents ordres de séquences de dépôts emboîtés. - Bulletin Centres
Recherches Exploration-Production Elf-Aquitaine, 15 (2): 384-410.
HILL, D. (1981): Coelenterata: Anthozoa. Subclasses Rugosa, Tabulata.- In: TEICHERT, C. (Ed.), Treatise on Invertebrate
Paleontology, part F, Coelenterata, Suppl. 1, Rugosa and Tabulata, XL+762 p.
MORZADEC, P. (1983): Le Dévonien (Emsien-Famennien) de la rade de Brest (Massif armoricain). Lithologie,
cartographie, stratigraphie, paléogéographie. - Géologie de la France, 2 (4): 269-309.
PLUSQUELLEC, Y. (2006): Révision de Hadrophyllum orbignyi Milne-Edwards & Haime, 1850 (Coelenterata, Rugosa) du
Dévonien d’Amérique du Nord et discussion sur la systématique des Hadrophyllidae. – Geodiversitas, 28 (2): 199-
226.
PLUSQUELLEC, Y., WEBB, G.E. & HOEKSEMA, B.V. (1999): Automobility in tabulata, rugosa, extant scleractinian analogues;
stratigraphic and paleogeographic distribution of Paleozoic mobile corals. – Journal of Paleontology, 73 (6): 985-
1001.
SOTO F. (1986): Consideraciones sobre la posición sistematica del género Angustiphyllum Altevogt (Coelenterata,
Rugosa) del Devónico medio de la Cordillera Cantábrica (NO de España). - Revista española de paleontología, 1 (1):
63-72.
Fig. 1 (next page): Angustiphyllum n. sp. 1 (fig. 1-3 specimen LPB 15 347, fig. 4-7 LPB 15 348) and Angustiphyllum
n. sp. 2 (fig. 8-11 specimen LPB 15 349, fig. 12-13 LPB 15 350). All calicinal views (1, 4, 9, 13) with the same
orientation: cardinal costoseptum (C) and alar (A) on top of figure, counter (K) and counter-lateral (KL) on bottom.
Lateral views of broad side of wedge: 2, 6, 10, 12 (counter side), 4, 8 (cardinal side). Lateral views of narrow side of
wedge: 3, 7 (cardinal side on left), 11 (cardinal side on right). All specimens at same magnification (scale bar 5 mm).
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