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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Devonian Stromatoporoids from Vietnam: biodiversity and affinities.
Huu Hung NGUYEN 1 & Bruno MISTIAEN 2
1 Bảo tàng thiên nhiên Việt Nam 18, Hoàng Quốc Việt, Hà Nội, Việt Nam
2 Laboratoire de Paléontologie stratigraphique FLST & ISA, FRE 3298 « Geosystèmes » du CNRS, 48
Boulevard Vauban, F-59046 Lille cedex, France; bruno.mistiaen@isa-lille.fr
Publications devoted to Devonian stromatoporoids in Vietnam including some systematic aspects are
relatively numerous (more than twenty) and probably more than in a lot of others countries, excepted
Russian areas.
In fact, if more than twenty papers are involved with stromatoporoid description and distribution in
Vietnam, essentially published during the last sixty last years, rarely the Vietnamese faunas are cited or
used in order to develop analyses or interpretations such as palaeobiogeographic reconstructions. The
mean reason is the fact that many of those palaeontological studies have been published in local journals
through low diffusion level and generally not accessible to other researchers interested on the group. Only
three of these papers were published in journals in foreign countries (DONG DE YUAN 1964; TONG-DZUY
THANN et al. 1988; NGUYEN HUU HUNG & MISTIAEN 1997). Consequently, the majority of those papers are
not really diffused. As a direct result, for instance in the STEARN et al. (1999) - abridged presentation of the
new Treatise - only five stromatoporoid genera (Actinostroma, Plectostroma, Trupetostropa, Hermatoporella and
Vacuustroma) are cited from the Devonian of Vietnam, and two genera (Clathrodictyon and Amphipora)
considered as cosmopolitan are considered as beingpresent, whereas looking to the data base elaborated
from the listed papers for the present purpose, nearly thirty other genera have been recognized in Vietnam.
Thus, only about 20% of the present genera are documented.
In the same way, none stromatoporoids genus is referred with a Famennian age, even if in reality they
are abundant and well diversified for instance in North Central Vietnam (Phong Nha – Ke Bang National
Park outcrops).
Always on a generic level, two new genera have been proposed, based on material from Vietnam i.e.
Vacuustroma HUNG & MISTIAEN 1997, Vietnamostroma HUNG & MISTIAEN 1998, (and also another one
Truongsonella HUNG & MISTIAEN in press). But at that time, only the genus Vacuustroma is in addition
recognized in another country.
On the same manner and on a specific level, between 1965 and nowadays, more than twenty five species
have been proposed as new species, based on material from the Devonian of Vietnam, but, at the present
time, none of them has been recognized in other places in the world.
Thus the purpose of the present work is to establish a data base, as complete as possible, for all
Devonian stromatoporoids from Vietnam and also to analyse and point out a number of
palaebiogeographic affinities relatively to the Vietnamese stromatoporoid faunas.
DONG DE YUAN (1964): Stromatoporoids from the Early Carboniferous of Kwangsi and Kueichow. - Acta Paleontologica
Sinica, 12 (2): 280-299.
NGUYEN HUU HUNG & MISTIAEN, B. (1997): Vacuustroma, un genre nouveau de Stromatopore dendroide du Dévonien du
Vietnam et du Boulonnais (France). – Geobios 30 (2): 193-204.
STEARN, C.W., WEBBY, B.D., NESTOR, H. & STOCK, C.W. (1999): Revised classification and terminology of Palaeozoic
stromatoporoids. - Acta Palaeontologica Polonica, 44: 1–70.
TONG-DZUY THANN, NGUYEN DUC KHOA, KHROMYCH, NGUYEN HUU HUNG, NGUYEN THE DZAN & TA PHUONG (1988):
Devonian stratigraphy and Coelenterate of Vietnam. - Nauka Siberian Branche Novosibirsk, Vol. II : 157 p.