Septomedullopitys szei sp. nov., a new gymnospermous wood from Lower Wuchiapingian (Upper Permian) continental deposits of NW China, and its implication for a weakly seasonal humid climate in mid-latitude NE Pangaea
Septomedullopitys szei sp. nov., a new gymnospermous wood from Lower Wuchiapingian (Upper Permian) continental deposits of NW China, and its implication for a weakly seasonal humid climate in mid-latitude NE Pangaea
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szei sp. Septomedullopitys szei sp.
DOI：
10.1016/j.palaeo.2014.04.011
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Jun Wang
中科院分区：
文献类型：
--
作者：
Mingli Wan;Wan Yang;Jun Wang
Szei sp.11月产于新疆博格达山南段塔龙谷地的乌家坪组乌通沟组，产于中国西北部。茎具有直径约15-20毫米的异质髓，并包含许多线形分泌管和薄壁组织带。初生木质部为内原型，管胞具有梯形加厚。次生木质部为原生叶绿体类型。与同时代裸子植物木材的比较表明，塔龙茎代表了该地区二叠纪的一种新的形态分类群。茎中存在的粪便、钻孔和纺锤形的空洞表明，动物-植物-真菌之间存在着良好的相互作用。茎内出现多次生长中断和没有真正的生长轮，表明年降水量的季节性较弱。这些中断表明，气候潮湿，有短期的、非周期性的干旱。
Septomedullopitys szei sp. nov. is described from the Wuchiapingian Wutonggou Formation of Tarlong Valley, southern Bogda Mountains, Xinjiang, in northwestern China. The stem has a heterogeneous pith ca. 15–20 mm in diameter, and containing numerous linear secretory ducts and parenchymatous bands. Primary xylem is endarch and the tracheids contain scalariform thickenings. Secondary xylem is of the Protophyllocladoxylon type. Comparisons with contemporaneous gymnospermous woods containing either heterogeneous pith with ducts or Protophyllocladoxylon-type secondary xylem from the Angara palaeocontinent indicate that the Tarlong stem represents a new Permian morphotaxon for the region. The presence of coprolites, borings, and spindle-shaped cavities within the stem suggests well-developed animal–plant–fungi interactions. The occurrence of numerous growth interruptions and absence of true growth rings within the stem suggest weak seasonality of annual precipitation. The interruptions suggest a humid climate with short-term, nonperiodic droughts.