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Hexaloba finisensia

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Journal Article

ON PALEOZOIC PLANTS FROM MARINE STRATA: HEXALOBA FINISENSIA NEW GENUS AND SPECIES, A TRIGONOCARPALEAN OVULE FROM THE VIRGILIAN (UPPER PENNSYLVANIAN: GZHELIAN) FINIS SHALE OF TEXAS Available to Purchase

MICHAEL T. DUNN, GENE MAPES, GAR W. ROTHWELL
Published: 01 January 2002
Journal of Paleontology (2002) 76 (1): 173–180.
DOI: https://doi.org/10.1666/0022-3360(2002)076<0173:OPPFMS>2.0.CO;2
... Hexaloba new genus Hexaloba finisensia new species, by monotypy. Ovoid ovules with six ribbed hexagonal symmetry in cross section. Integument differentiated into three tissue layers: outer sarcotesta of a single layer of elongate, tubular radially aligned cells: middle sclerotesta two...
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View PDF for article title, ON PALEOZOIC PLANTS FROM MARINE STRATA: <span class="search-highlight">HEXALOBA</span> <span class="search-highlight">FINISENSIA</span> NEW GENUS AND SPECIES, A TRIGONOCARPALEAN OVULE FROM THE VIRGILIAN (UPPER PENNSYLVANIAN: GZHELIAN) FINIS SHALE OF TEXAS
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Image
Figure2—Stylized composite reconstruction of Hexaloba finisensia. 1, Longitudinal section; 2, medial cross section. Explanation of abbreviations: e = endotesta, vb = vascular bundle, m = megaspore membrane, n = nucellus, sc-i = inner sclerotestal zone, sc-o = outer sclerotestal zone, s = sarcotesta

Figure 2 —Stylized composite reconstruction of Hexaloba finisensia . 1, ... Available to Purchase

Published: 01 January 2002
Figure 2 —Stylized composite reconstruction of Hexaloba finisensia . 1, Longitudinal section; 2, medial cross section. Explanation of abbreviations: e = endotesta, vb = vascular bundle, m = megaspore membrane, n = nucellus, sc-i = inner sclerotestal zone, sc-o = outer sclerotestal zone, s
Image
Figure3—Hexaloba finisensia n. gen. and sp. structure and morphology. 1, LS-748, external morphology, showing the characteristic longitudinal ridges (two are fully visible in this view) of H. finisensia. The apparent suture on the summit edge of R2 is not characteristic of the species and may be taphonomic, ontogenetic, or both. ×4, scale bar = 2 mm; 2, LS-748, section 5, OUPH13466, longitudinal section showing micropylar tube (m), sarcotesta (s), sclerotesta (sc), and nucellus (n). ×3.5, scale bar = 2 mm; 3, LS-483, section 1, OUPH13467, cross section of internal morphology near micropylar end, note three commissured primary ribs (c). ×7, scale bar = 1 mm; 4, LS-482, section 3, OUPH13468, cross section of internal morphology near chalaza showing primary and secondary ribs. Note that secondary ribs are prominent (r2a), subtle (r2b), or missing (r2c). ×5, scale bar equals 1 mm; 5, LS-735, section 7, OUPH13469, cross section of internal morphology near mid-region. Arrows indicate position of vascular bundles. ×7, scale bar = 1 mm

Figure 3 — Hexaloba finisensia n. gen. and sp. structure and morphology. ... Available to Purchase

Published: 01 January 2002
Figure 3 — Hexaloba finisensia n. gen. and sp. structure and morphology. 1, LS-748, external morphology, showing the characteristic longitudinal ridges (two are fully visible in this view) of H. finisensia . The apparent suture on the summit edge of R2 is not characteristic of the species
Image
Figure4—Hexaloba finisensia n. gen. and sp., anatomy of integument. 1, LS-482, section ×S3, OUPH13468, cross section of the three-layered integument showing endotesta (at arrow), inner sclerotesta layer (sc1), outer sclerotesta layer (sc2), and thinner walled undulating, sarcotesta cells to the right. ×150, scale bar = 100 μm; 2, LS-717, section 6, OUPH13470, longitudinal section of integument showing inner sclerotesta layer (sc1), outer sclerotesta layer (sc2), and thinner walled undulating, sarcotesta cells to the right. ×130, scale bar = 100 μm; 3, LS-748, section 5, OUPH13466, longitudinal section through sclerotesta showing interwoven cells. ×60, scale bar = 100 μm; 4, LS-748, section 5, OUPH13466, longitudinal section showing undulating, radially aligned sarcotesta cells. ×50, scale bar = 100 μm

Figure 4 — Hexaloba finisensia n. gen. and sp., anatomy of integument. 1... Available to Purchase

Published: 01 January 2002
Figure 4 — Hexaloba finisensia n. gen. and sp., anatomy of integument. 1, LS-482, section ×S3, OUPH13468, cross section of the three-layered integument showing endotesta (at arrow), inner sclerotesta layer (sc1), outer sclerotesta layer (sc2), and thinner walled undulating, sarcotesta cells
Image
Figure5—Hexaloba finisensia n. gen. and sp., anatomy of vascular system and integument. 1, LS-717, section 6, OUPH13470, longitudinal section of chalazal region showing the three layers of the integument: sarcotesta (s), sclerotesta (sc), and endotesta (e). Note thickened region of nucellus (n) indicating location of a vascular bundle. Box represents approximate region of Figure 5.2. ×12, scale bar = 1 mm; 2, LS-717, section 6, OUPH13470, enlargement of nucellar vascular bundle showing individual tracheids (arrows). ×120, scale bar = 100 μm; 3, LS-421, section B2, OUPH13473, cross section near chalazal end, arrow indicates primary vascular bundle. ×40, scale bar = 0.25 mm; 4, LS-482, section LS6, OUPH13472, longitudinal section of nucellar vascular bundle showing tracheids (arrows) with sclariform wall thickenings. ×300, scale bar = 50 μm

Figure 5 — Hexaloba finisensia n. gen. and sp., anatomy of vascular syste... Available to Purchase

Published: 01 January 2002
Figure 5 — Hexaloba finisensia n. gen. and sp., anatomy of vascular system and integument. 1, LS-717, section 6, OUPH13470, longitudinal section of chalazal region showing the three layers of the integument: sarcotesta (s), sclerotesta (sc), and endotesta (e). Note thickened region of nucellus