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Nudasporestrobus ningxicus
Nudasporestrobus ningxicus Z. Feng, Jun Wang bis, Bek Rev. Palaeobot. Palynol., 149(3-4): 153. Apr 2008
- Name
- Nudasporestrobus ningxicus
- Rank
- Species
- Generic Name
- [Genus] Nudasporestrobus
- Authors (Pub.)
- Feng Z.
Wang J.
Bek J.
- Publication
- Nudasporestrobus ningxicus gen. et sp. nov., a novel sigillarian megasporangiate cone from the Bashkirian (Early Pennsylvanian) of Ningxia, northwestern China [2008/4]
- Journal
- Review of Palaeobotany and Palynology
- Volume
- 149
- Issue
- 3-4
- Page number
- 153
- Year
- 2008
- Fossil Status
- cones
- Stratigraphy
- Bashkirian
- Strat. comment
- Yanghugou Formation
- Location
- Xiaheyan, Zhongwei, Ningxia Hui Autonomous Region, P.R. China
- Paleoregion
- Cathaysia (Sino-Korea)
Data for Holotypus
- Repository
- Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China
- Repository Number
- PB20826
- Diagnosis
- The pedunculate cylindrical strobilus is large.
Imbricate sporophylls are arranged in low ascending spirals,
sometimes they are preserved in alternating whorl-like
impressions. There are 8–10 sporophylls in each spiral. The
axis is wide in diameter. Each sporophyll consists of two parts, a
deltoid pedicel and an abaxial keeled lamina. The pedicel
emerges from the axis of the strobilus almost horizontally. The
free lateral lamina is up to more than 1 mm long, with smooth
margin. It is bent upwards from the distal extremity of the
pedicel. A heel is formed at the corner of the sporophyll. The
sporophyll adaxially bears a single large, elliptical sporangium.
Megasporophylls are attached to the axis from the basal to the
upper parts of the strobilus. Each megasporangium contains
about 32 in situ trilete megaspores with developed subgula; the
megaspores vary considerably in size, and they are identical to
the dispersed megaspore of the Sublagenicula nuda-type. The
sporophylls are shed at maturity, and a triangular scar usually
left on the axis of the strobili.
