Tertiary Isoetes from Tasmania

IF 1.2 4区 地球科学 Q3 PALEONTOLOGY Alcheringa Pub Date : 2008-11-27 DOI:10.1080/03115518808619003
R. Hill
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引用次数: 7

Abstract

Leaves and megaspores for the Late Oligocene — Early Miocene Monpellyata flora are assigned to the new species Isoetes reticulata. This represents the first Tertiary macrofossil evidence for the genus in Australia. The species is distinct from all extant species of Isoetes in southern Australia and does not closely resemble any extant species so far examined. The lack of stomates on the leaves of I. reticulata suggests that the species grew wholly submerged in water, and this, along with the excellent state of preservation, adds to evidence indicating that the depositional site was equivalent to an extant alpine or sub-alpine lake with Isoetes growing in situ.
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塔斯马尼亚岛的第三纪Isoetes
晚渐新世-早中新世Monpellyata植物区系的叶片和大孢子归属于新种Isoetes reticulata。这是该属在澳大利亚的第一个第三纪大化石证据。该物种与澳大利亚南部所有现存的Isoetes物种不同,并且与迄今为止研究的任何现存物种都不相似。水蛭叶片上缺少气孔表明该物种生长时完全淹没在水中,再加上其良好的保存状态,进一步证明该沉积地点相当于一个现存的高山或亚高山湖泊,水蛭在原地生长。
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来源期刊
Alcheringa
Alcheringa 地学-古生物学
CiteScore
2.60
自引率
7.70%
发文量
28
审稿时长
>12 weeks
期刊介绍: Alcheringa : An Australasian Journal of Palaeontology is the official journal of the Australasian Palaeontologists. Alcheringa covers all aspects of palaeontology and its ramifications into the earth and biological sciences, including: Taxonomy- Biostratigraphy- Micropalaeontology- Vertebrate palaeontology- Palaeobotany- Palynology- Palaeobiology- Palaeoanatomy- Palaeoecology- Biostratinomy- Biogeography- Chronobiology- Biogeochemistry- Palichnology. Review articles are welcome, and may be solicited from time to time. Thematic issues are also possible. Emphasis is placed on high quality and informative illustration, in both line drawings and photographs. Papers of general significance may receive preference over those of more local interest.
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