. Bulletin of the British Museum (Natural History), Geology. LOWER JURASSIC INSECTS OF DORSET 153 Holotype. (Figs 47-49, 51); Flatstones, Stonebarrow, Dorset; part and counter- part. Jackson colln. Dimensions: Forewing length 24mm, width 6-3mm. Hindwing, 21-5 x 6mm. Paratypes. , , , Discussion. The new species from Dorset, with a wingspan of 50 mm, is larger than any other species of Orthophlebia except the huge 0. grandis Martynov 1927, from Turkestan, which has a wingspan of 70 mm. Even O. gigantea Tillyard, from the Trias of Strensham (), had a
. Bulletin of the British Museum (Natural History), Geology. LOWER JURASSIC INSECTS OF DORSET 153 Holotype. (Figs 47-49, 51); Flatstones, Stonebarrow, Dorset; part and counter- part. Jackson colln. Dimensions: Forewing length 24mm, width 6-3mm. Hindwing, 21-5 x 6mm. Paratypes. , , , Discussion. The new species from Dorset, with a wingspan of 50 mm, is larger than any other species of Orthophlebia except the huge 0. grandis Martynov 1927, from Turkestan, which has a wingspan of 70 mm. Even O. gigantea Tillyard, from the Trias of Strensham (), had a wingspan of only 38 mm and most Liassic species were much smaller. All the specimens of 0. capillata show the very hairy nature of the wings, with hairs on the membrane as well as along the veins. shows the microtrichia particularly well when the rock surface is wet; some larger hairs are preserved on the membrane while even larger setal bases are clearly visible along the anal veins: presumably there were originally long setae on these veins. The costal margin is covered with short stout hairs, while the pterostigma is covered by a dense patch of microtrichia. The wing membrane as preserved in some specimens looks as though it may have been slightly thickened and perhaps translucent in life. The smaller 0. anglicus described from the Lower Lias of Gloucestershire lacks the Y-shaped second anal vein present in the hindwing of 0. capillata. Genus PROTORTHOPHLEBIA Tillyard, 1933 Type species. Protorthophlebia latipennis Tillyard (1933: 28), by original designation. Upper Trias to Upper Jurassic, Europe and Asia. Diagnosis. Orthophlebiids with a wing length of less than 10 mm. Rs five-branched. Protorthophlebia latipennis Tillyard, 1933 Figs 50, 52-53 1933 Protorthophlebia latipennis Tillyard: 29, fig. 6. Diagnosis. As genus. Three anteradial veins; setal bases on anal veins large and prominent. Description. Sc and Rj end at pterostigma. R2 forked near wing margin. Two-b
Size: 2558px × 977px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbritishmuseumnaturalhistory, bookcentury1900, bookcoll
