. Bulletin of the British Museum (Natural History), Geology. 122 P. E. S. WHALLEY Liassophlebia gigantea Zeuner, 1962 Fig. 7a, b 1962 Liassophlebia gigantea Zeuner: 163; pi. 27, fig. 2. This forewing has been developed further since it was examined by Zeuner but the newly- revealed parts do not alter his interpretation. The full shape of the discoidal cell is revealed as elongate and lying almost at right angles to the main axis. The discoidal cell is closed at the posterior margin, unlike L. magnified where the cell is open in the forewing, although closed in the hindwing. The development of
. Bulletin of the British Museum (Natural History), Geology. 122 P. E. S. WHALLEY Liassophlebia gigantea Zeuner, 1962 Fig. 7a, b 1962 Liassophlebia gigantea Zeuner: 163; pi. 27, fig. 2. This forewing has been developed further since it was examined by Zeuner but the newly- revealed parts do not alter his interpretation. The full shape of the discoidal cell is revealed as elongate and lying almost at right angles to the main axis. The discoidal cell is closed at the posterior margin, unlike L. magnified where the cell is open in the forewing, although closed in the hindwing. The development of the wing has exposed the nodal area and also clearly shows the strongly curved base of the costa. Holotype. ; Woodstones, Black Yen, Charmouth, Dorset. Jackson colln. ^-^W*'- \ â â wmftmtn i&mlk*} >» *t. ⢠/ â â â ⢠., 7 a *d£&J& j"»»ng»."^i »r*i<6feiStei*â"t.''* , r^?. 7 b ':^cl^v. ,:^m Fig. 7 Liassophlebia gigantea Zeuner (Odonata). Holotype, a, part, wing length c. 33 mm (incomplete), b, counterpart, wing length c. 24 mm (incomplete). Liassophlebia anglicanopsis (Zeuner) 1962, comb. nov. Fig. 8a, b 1962 Petrophlebia anglicanopsis Zeuner: 160; pi. 24, figs 1, 2. By degagement it has been possible to develop this specimen, revealing far more than could be seen when Zeuner examined it. The incomplete wing seen by Zeuner was only 34-5 x 15 mm, but using the fine pneumatic drill to remove the overlay, 64 x 20 mm of it has now been revealed. In spite of this, Zeuner's original estimate of the total wing length (80 mm) is still considered reasonable. He commented that 'the poor condition of the wing, with its corroded edge, suggests prolonged drifting' (Zeuner 1962: 161), but this is untenable in the light of the new evidence revealed by development. The wing was not in poor condition but the 'corroded' edges were buried immediately below an ammonite (Asteroceras obtusum J. Sowerby): when the. Ple
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