Showing posts with label Dragonflies. Show all posts
Showing posts with label Dragonflies. Show all posts
Thursday, February 26, 2015
Wednesday, February 11, 2015
Thursday, January 22, 2015
Wednesday, January 14, 2015
Tuesday, January 6, 2015
Saturday, December 13, 2014
ID - Red veined Darter - Immature male VS female
A common problem when trying to identify odonata species (both Damselflies & Dragonflies) is that immature males of a species often look quite similar to mature females, which can become very misleading. The easiest way for a fast and accurate identification is the observation of reproductive structures, such as the male secondary genitalia and appendages or the female ovipositor or the vulvar scale. However, in many cases this becomes difficult due to their small size or a not so suitable angle between the subject and the observed. In this cases coloration might become a better index for the identification. Here I will try to point out some differences between immature male and mature female red veined darters (Sympetrum fonscolombii).
This is a mature female individual. The abdomen's coloration, with the two black stripes running the ventral part of the abdomen, is characteristic for the females.
A better view of the female abdomen.
Now this is how an immature male looks like. The general similarity with the female is more than obvious, however the specific pattern in the abdomen is missing. Moreover, if you give a better look under the base of the abdomen (S2) you will notice a slight "swelling" which is a male's reproductive structure enabling him to transfer sperm to the female, the so called secondary genitalia.
Eventually, the immature male will start to become mature and change his colour to red. This is how this procedures begins. As you can see the dorsal of the abdomen has already turned red, and the rest of the body will follow.
Tuesday, December 9, 2014
Monday, December 1, 2014
Friday, November 22, 2013
Sunday, November 18, 2012
Thursday, November 8, 2012
Tuesday, October 30, 2012
Sunday, October 28, 2012
Friday, October 26, 2012
Friday, April 20, 2012
Κιτρινοσουσουράδα - Yellow wagtail - Motacilla flava
Νεαρή κιτρινοσουσουράδα (Motacilla flava) στη λιμνοθάλασσα Καλοχωρίου. Οι φωτογραφίες
είναι τραβηγμένες τον Ιούλιο του 2009. Το συγκεκριμένο πουλί μέσα σε 10
λεπτά είχε φάει 4 ελικοπτεράκια Crocothemis erythraea, που μπορείτε να
δείτε στις δύο επόμενες φωτογραφίες. Το πρώτο είναι θηλυκό, ενώ το δεύτερο αρσενικό.
Juvenile yellow wagtail (Motacilla flava) at Kalochori lagoon. The photos were taken in July 2009. This individual ate in an interval of 10 minutes 4 dragonflies Crocothemis erythraea, photos of which you can see below. The first one is a female and the second a male.

Labels:
Birds,
Dragonflies,
Yellow Wagtail,
Καλοχώρι,
Κιτρινοσουσουράδα,
Πουλιά
Subscribe to:
Posts (Atom)

















