The INTERNATIONAL FOSSIL PLANT NAMES INDEX
Global registry of scientific names of fossil organisms covered by the International Code of Nomenclature for Algae, Fungi, and Plants and the International Code of Zoological Nomenclature © 2014-2024

IDNAME urn:idName:ifpni.org:species:E2A42651-C304-40C0-80AB-0F1ECA15E6D9 species
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Thalassites parkavonensis

Thalassites parkavonensis Benzecry, Brack-Hanes Bot. J. Linn. Soc., 157(1): 24. 28 Apr 2008
Name
Thalassites parkavonensis
Rank
Species
Generic Name
[Genus] Thalassites
Authors (Pub.)
Benzecry A. Brack-Hanes S. D.  
Publication
A new hydrocharitacean seagrass from the Eocene of Florida [2008/4]
Journal
Botanical Journal of the Linnean Society
Volume
157
Issue
1
Page number
24
Year
2008
Fossil Status
rhizomata
Stratigraphy
Eocene
Strat. comment
Avon Park Formation, Claiborne Stage
Location
Florida Rock Industries dolomite/limestone quarry, approximately 1.5 miles south of Gulf Hammock (sec. 28, T14s, R16s), Levy County, Florida, USA
Paleoregion
America (North)
Data for Holotypus
Repository
Eckerd College Herbarium, Palaeobotanical Collection, St.-Petersburg, USA
Repository Number
AP Series #267A & B (part and counterpart) and APS Series 267A.
Diagnosis
Dimorphic rhizome system with striated, monopodial, plagiotropic rhizome 5–10 mm in width; internodal distance constant (10–12 mm); closed annular scars at nodes and fine, straight, unbranched roots infrequent at internodes; epidermis of differentially thickened elongate cells in files parallel to the long axis, cortex spongy. Orthotropic, bifurcated, short shoots about 3–6 mm wide in pairs every three to five nodes. Epidermis of short shoots with differentially thickened, almost isodiametrical (cuboidal) cells and a cuticle; spongy cortex with longitudinal bundles of fibres; crystals and tannins abundant. Terminal clusters of six to eight, strap-shaped, eligulate leaves almost encircle short shoots in alternate and distichous arrangement. Non-fibrous leaf blades (15–19 mm wide) have entire, smooth margins and rounded apices. Leaf venation parallel (27–30 veins) with perpendicular and oblique cross veins. Median vein is prominent. Fibrous, amplexicaulous, basal leaf sheath (15–19 mm wide and 30–45 mm long) is persistent. Leaf epidermal cells are elongate to cuboidal and have straight, thin walls. Tanniferous cells are profuse and in circular aggregations. Crystals are abundant.
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