Field Guide to Seagrasses of the Red Sea - Seagrass-Watch

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Thalassia hemprichii (Ehrenberg) Ascherson Thalassia hemprichii (Plate 1) is a widespread species throughout the Red Sea, including the Gulf of Aqaba, but has not been reported in the Gulf of Suez. On the eastern side of the Red Sea, the abundance of this species increases southward (Price, et al., 1988). Morphology Leaf The blade of the leaf is up to 40 cm long, but typically much shorter, and 0.4-1.0 cm wide. The leaf blade is ribbon-like and often slightly curved with obvious large cells grouped in red or black bars. The leaf sheath is well developed and there are 10-17 longitudinal leaf veins (Plate 1). The margin of the leaf is smooth except for the leaf tip, which has fine serrations and is rounded. Stem The stem is short and erect, bearing 2-6 leaves. Rhizome The rhizome is thick and covered with triangular shaped leaf scars. 48
Microscopic Leaf Anatomy Cell shape can range from circular to rectangular with red or black colored cells arranged in regular bars (Plate 2). Similar Species • Both species of Cymodocea have a smooth rhizome without scars and lack obvious cells arranged in dark bars. Key Features • Rhizome is thick and covered by obvious triangular leaf scars (Plate 3). • Ribbon-like leaves arise from short erect stem with fully enclosed leaf sheath (Plate 3). Diagnostic Features • Curved leaves with clearly visible red or black cells arranged in bars running along the blade (Plate 4). Habitat Shallow Coastal/Back Reef Reef Deep Coastal Field Guide to Seagrasses of the Red Sea 49
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Seagrasses Field Guide to of the Re
Page 4 and 5:
The designation of geographical ent
Page 7: Foreword The role of taxonomy in un
Page 10 and 11: viii
Page 12 and 13: history. Peter Forsskål, a Swedish
Page 14 and 15: Figure 1. Schematic map represents
Page 17 and 18: Shallow coastal habitat Seagrass me
Page 19 and 20: Bay (or Sharm) A Sharm is the Arabi
Page 21 and 22: An individual seagrass plant consis
Page 23 and 24: Cymodocea rotundata Ehrenberg & Hem
Page 25 and 26: Leaf tip Close-up area Two tips on
Page 27 and 28: Microscopic Leaf Anatomy Cells are
Page 29 and 30: Halodule pinifolia (Miki) den Harto
Page 31 and 32: Leaf blade Close-up area Leaf sheat
Page 33 and 34: Stem The stems are short, erect and
Page 35 and 36: Syringodium isoetifolium (Ascherson
Page 37 and 38: Cylindrical leaf blade Close-up are
Page 39 and 40: Microscopic Leaf Anatomy Cells are
Page 41 and 42: Wide flat leaf sheath Leaf scars on
Page 43 and 44: Enhalus acoroides (L.f.) Royle Enha
Page 45 and 46: Leaf blade Mag. 20x Close-up area (
Page 47 and 48: Microscopic Leaf Anatomy Cells angu
Page 49 and 50: Halophila ovalis (R. Brown) Hooker
Page 51 and 52: Dark colored dots Close-up area Ova
Page 53 and 54: Rhizome The rhizome is smooth, thin
Page 55 and 56: Halophila stipulacea (Forsskål) As
Page 57: Leaf blade Mid vein Lopsided leaf s
Page 61: Glossary Bullose: bulb-shaped or bu
Page 64 and 65: Lipkin, Y. (1977). ‘Seagrass vege
Page 66: About the Guide This guide answers
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Field Guide to Seagrasses of the Red Sea - Seagrass-Watch

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