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DENDROIDS FROM THE XINCHANGIAN STAGE (EARLY ORDOVICIAN) OF THE XIUSHUI
DRAINAGE BASIN, JIANGXI PROVINCE
Yu Jian-hua, Liu Huai-bao and Fang Yi-ting
Acta Palaeontologica Sinica 1985, 24, 1, 18-28
 
 
Abstract (p. 27):

"Dendroid graptolites from the Xinchangian Stage (Early Ordovician) of the Xiushui Drainage Basin are described in this
paper. They include 25 species and subspecies assigned to 8 genera, in which, 11 species and subspecies are new. Except
some species of
Dictyograptus occuring in the zone of Staurograptus (X1), most of the dendroid graptolites described herein
were collected from the zone of
Adelograptus asiaticus - Clonograptus minutus (X3) in this region. Among them, dictyonemid
(in a broad sense) are dominant. In fact, these graptolites known as
Dictyonema include two different forms, i.e. planktonic
form bearing a distinct sicula and a floating vesicle, and the benthic form bearing a stem with a disc of attachment. The
authors agree to prof. Mu's (1953) dividing dictyonemids into two genera:
Dictyograptus for planktonic form and Dictyonema
for bentic one. Considering that
Dictyonema and Dictyograptus have different number of primary stipes respectively, one can
possibly take the numbers of primary stipes as an important criterion for classifying the dictyonemids."
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                                                     List of graptolites

DENDROGRAPTUS Hall, 1858
Dendrograptus gracilis Hall, 1865
Dendrograptus mui Yu Jian-hua et al., 1985
DICTYONEMA Hall,1851
Dictyonema ganbeiense Yu Jian-hua et al., 1985
Dictyonema explicitum Yu Jian-hua et al., 1985
Dictyonema xiushuicum Yu Jian-hua et al., 1985
DICTYOGRAPTUS Hopkins & Lapworth, 1875, emend Westergard, 1909
Dictyograptus flabelliformis parabolus (Bulman, 1954) Yu Jian-hua et al., 1985
Dictyograptus flabelliformis cf. anglicus (Bulman, 1927) Yu Jian-hua et al. 1985
Dictyograptus serratus Yu Jian- hua et al., 1985
ASPIDOGRAPTUS Bulman, 1934
Aspidograptus uniflexilis Yu Jian-hua et. al., 1985
CALLOGRAPTUS Hall, 1865
Callograptus cf. taitzehoensis Mu, 1953
Callograptus genuflexus Yu Jian-hua et al., 1985
Callograptus xiushuiensis Yu Jian-hua et al., 1985
AIROGRAPTUS Ruedemann, 1916
Airograptus cf. furciferus (Ruedemann, 1904) Ruedemann, 1947
RADIOGRAPTUS Bulman, 1950
Radiograptus nelumbifolius jiangxiensis Yu Jian-hua et al., 1985
HAPLOGRAPTUS Ruedemann, 1933
Haplograptus sinicus minutus Yu Jian-hua et el., 1985
Haplograptus fruticosus Yu Jian-hua et al., 1985
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since 2002
 
 
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