| Citation | Gambles, R.M. 1987 Hagen's tubercle, a largely overlooked but potentially useful character in Gomphid taxonomy (Anisoptera: Gomphidae). Advances in Odonatology 3:51-60. |
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| Address | Windings, Whitchurch Hill, Reading, RG8 7NU, United Kingdom |
| Ref. No. | 84936 |
| Language | English |
| Usage | not used yet |
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