Tau Emerald : Merry Christmas . . .
The tau emerald (Hemicordulia tau) is a species of dragonfly in the family Corduliidae. Corduliidae is the only family not a clade within the Infraorder Anisoptera. The species was first described by Edmond de Sélys Longchamps in 1871.
The tau emerald is a medium-sized, black and yellow dragonfly with long legs, reaching a body length of about 50 mm. As is unique to dragonfly and mayfly species, H. tau has flight muscles attached directly to the wings, and in both the males and females the inboard edge of the hindwing is rounded. The 7th abdominal tergum is extensively black above and yellowish at the sides The top of the frons are yellow with a dark T-mark. The species exhibits a linear relationship between head width and body length.
Nearly all of the dragonfly’s head is eye, allowing incredible vision that encompasses almost every angle except right behind them. H. tau has a particularly large and well developed compound eye with two principal regions, the dorsal eye and the ventral eye. The dorsal eye is principally sensitive to short wavelength light, while the ventral eye has 3 or more spectral types of photo receptors (Wikipedia)
This is a female. The background bokeh makes a close resemblance to Christmas decoration lights.
Tau Emerald : Merry Christmas . . .
The tau emerald (Hemicordulia tau) is a species of dragonfly in the family Corduliidae. Corduliidae is the only family not a clade within the Infraorder Anisoptera. The species was first described by Edmond de Sélys Longchamps in 1871.
The tau emerald is a medium-sized, black and yellow dragonfly with long legs, reaching a body length of about 50 mm. As is unique to dragonfly and mayfly species, H. tau has flight muscles attached directly to the wings, and in both the males and females the inboard edge of the hindwing is rounded. The 7th abdominal tergum is extensively black above and yellowish at the sides The top of the frons are yellow with a dark T-mark. The species exhibits a linear relationship between head width and body length.
Nearly all of the dragonfly’s head is eye, allowing incredible vision that encompasses almost every angle except right behind them. H. tau has a particularly large and well developed compound eye with two principal regions, the dorsal eye and the ventral eye. The dorsal eye is principally sensitive to short wavelength light, while the ventral eye has 3 or more spectral types of photo receptors (Wikipedia)
This is a female. The background bokeh makes a close resemblance to Christmas decoration lights.