Charco-Azul desert pup
| Charco-Azul desert pup | ||||||||||||
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| Cyprinodon veronicae | ||||||||||||
| Lozano Vilano & Contreras-Balderas , 1993 |
The Charco-Azul-Parrot ( Cyprinodon veronicae ) is a species of freshwater fish belonging to the genus of the Desert Parrot ( Cyprinodon ). It is considered to be extinct in nature.
features
The males of the Charco-Azul desert parrot reach a total length of 5.5 cm. The length of the short upper jaw is 0.70-0.77 times the length of the anal fin base. The head length is 2.7 to 2.9 times included in the standard length. The male has 6 to 7 fuzzy dark stripes along the sides that cover only the top half of the body. The females have an irregular egg spot on the dorsal fin. The black spot is crescent-shaped and smaller than a pupil. The eye diameter is 1 to 1.2 times the length of the base of the anal fin. The postdorsal (distance from the dorsal fin to the caudal stalk) and postanal (distance from the anal fin to the caudal stalk) length is 0.9 to 1.1 times the length of the caudal stalk. The anal fin is usually smaller than in related species and is 3 to 3.9 times the length of the head. The fourth ceratobranchial does not contain any teeth. The dorsal fin is located behind the base of the pectoral fin. Males in wedding dress are purple-blue.
distribution and habitat
The former distribution area are the now dried up freshwater springs at Ojo Charco Azul, also known as Barreno. They were part of the Bolsón de Sandia Valley in the Mexican state of Nuevo León , which is 1,600 m above sea level at the foot of the Sierra Montelongo Pedregoso Mountains. The region is semi-arid with cacti and other succulents . The shore is densely overgrown with cedars except on the east side . Originally the water was crystal clear and had a temperature of 19 to 20 ° C. After the springs shrank, the water turned brown and the bottom loamy or muddy. The aquatic vegetation included the genera Ceratophyllum , Potamogeton , Typha , Eleocharis , Lemna , Utricularia , Scirpus and Chara . A cancer of the genus Cambarellus was the only other animal species found .
status
In 1995 and 1996, the Bolsón-de-Sandia Valley was hit by a record drought that dried up the Ojo Charco Azul springs. In the winter of 1995 only one male was observed in a very weakened condition, which probably did not survive very long afterwards. Today the species predominantly exists in aquariums in the United States and Mexico. From Europe, postures from the London Zoo and Schönbrunn Zoo are known.
literature
- Maria de Lourdes Lozano Vilano; Salvador Contreras-Balderas: Four new species of Cyprinodon from southern Nuevo León, Mexico, with a key to the C. eximius complex (Teleostei: Cyprinodontidae). In: Ichthyological Exploration of Freshwaters v. 4 (no. 4), 1993, pp. 295-308.
- Robert Rush Miller; Wendell L. Minckley & Steven Mark Norris (2006): Freshwater Fishes of Mexico . University of Chicago Press. ISBN 0226526046 , p. 311.
- Lothar Seeghers: Killifishes of the world - New world killis . Aquaristik - Consulting & Service GmbH, 1997