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E Darter Navigation menu VideoPhil Taylor E Dart 9DARTER
The male raised-wing display seems to be a synapomorphy of the Sulae; like almost all cormorants and shags but unlike almost all gannets and boobies, darters keep their wrists bent as they lift the wings in display, but their alternating wing-waving, which they also show before take-off, is unique.
That they often balance with their outstretched wings during walking is probably an autapomorphy of darters, necessitated by their being plumper than the other Sulae.
The Sulae were traditionally included in the Pelecaniformes , then a paraphyletic group of " higher waterbirds ".
The supposed traits uniting them, like all-webbed toes and a bare gular sac , are now known to be convergent , and pelicans are apparently closer relatives of storks than of the Sulae.
Hence, the Sulae and the frigatebirds — and some prehistoric relatives — are increasingly separated as the Suliformes , which is sometimes dubbed "Phalacrocoraciformes".
There are four living species of darters recognized, all in the genus Anhinga ,  although the Old World ones were often lumped together as subspecies of A.
They may form a superspecies with regard to the more distinct anhinga: . Extinct "darters" from Mauritius and Australia known only from bones were described as Anhinga nana "Mauritian darter" and Anhinga parva.
In the former case, however, the remains are larger than those of the geographically closest extant population of long-tailed cormorants on Madagascar : they thus might belong to an extinct subspecies Mauritian cormorant , which would have to be called Microcarbo africanus nanus or Phalacrocorax a.
The Late Pleistocene Anhinga laticeps is not specifically distinct from the Australasian darter; it might have been a large paleosubspecies of the last ice age.
The fossil record of the Anhingidae is rather dense, but very apomorphic already and appears to be lacking its base. The other families placed in the Phalacrocoraciformes sequentially appear throughout the Eocene , the most distinct — frigatebirds — being known since almost 50 Ma million years ago and probably of Paleocene origin.
With fossil gannets being known since the mid-Eocene c. Fossil Anhingidae are known since the Early Miocene ; a number of prehistoric darters similar to those still alive have been described, as well as some more distinct genera now extinct.
The diversity was highest in South America , and thus it is likely that the family originated there. Some of the genera which ultimately became extinct were very large, and a tendency to become flightless has been noted in prehistoric darters.
Their distinctness has been doubted, but this was due to the supposed "Anhinga" fraileyi being rather similar to Macranhinga , rather than due to them resembling the living species: .
Prehistoric members of Anhinga were presumably distributed in similar climates as today, ranging into Europe in the hotter and wetter Miocene.
With their considerable stamina and continent-wide distribution abilities as evidenced by the anhinga and the Old World superspecies , the smaller lineage has survived for over 20 Ma.
As evidenced by the fossil species' biogeography centered around the equator , with the younger species ranging eastwards out of the Americas, the Hadley cell seems to have been the main driver of the genus' success and survival: .
Protoplotus , a small Paleogene phalacrocoraciform from Sumatra , was in old times considered a primitive darter.
From Wikipedia, the free encyclopedia. Redirected from Darters. For other uses, see Darter disambiguation. Centrarchidae sunfishes , Cichlidae cichlids , Cyprinidae carps, minnows and relatives , Cyprinodontidae pupfishes , Mugilidae mullets , Plotosidae eeltail catfishes and Poeciliidae livebearers : Myers et al.
Anura frogs and toads , Caudata newts and salamanders , snakes , turtles and even baby crocodilians : Myers et al. Crustacea crabs, crayfish and shrimps , insects , leeches and mollusks : Myers et al.
Avian Biol. Paris: Jean-Baptiste Bauche. William, eds. Check-list of Birds of the World. Volume 1 2nd ed.
Cambridge, Massachusetts: Museum of Comparative Zoology. World Bird List Version 9. Development of the A-Darter began in ,  but the program suffered from inadequate funding and changes to the SAAF's requirements.
Ground seeker tests were concluded in January ,  while trajectory guidance and agility flight tests were performed in February Captive flight trials were concluded in March In March , Denel Dynamics disclosed that the missile, which was to be ready for production by end of , entered the qualification phase.
Final testing included the use of high-speed target drones to simulate an aircraft by towing infrared targets at high speed. The missile seeker can be slaved to the Helmet Mounted Display HMD ,  allowing the pilot to track a target beyond the aircraft's radar scan envelope using the missile's high off-boresight capability, achieved by the pilot turning his head towards the target to lock-on,  better known as "look and shoot".
The missile can then be launched and can immediately pull extreme g-force to reverse its course to engage a target behind the aircraft, sometimes called an "over-the-shoulder".
The A-Darter has four major sections: guidance section, warhead, control, and rocket motor. The absence of aluminium powder in the motor propellent inhibits production of a smoke trail, which means no visual warning for enemy aircraft.
From Wikipedia, the free encyclopedia. Redirected from A-darter. Type of Air-to-air missile. IHS Jane's Archived from the original on 18 November Retrieved 17 November We accomplish this by providing a safe working environment and recognizing how important the work they do is to the success of the company and its customers.
We know that without either, we cannot exist. Pad Printing Services We can pad print a permanent ink on a variety of materials from plastic, to metal, and glass, as well as many complex shapes like a golf ball and other curved surfaces.
Engineering Services Specializing in material application, reverse engineering, and plastic part prototyping, our product engineering and design services meet high industry standards Darter , any of about species of small, slender freshwater fishes constituting the subfamily Etheostominae of the family Percidae order Perciformes; sometimes given family standing as the Etheostomidae.
All the darters are native to eastern North America. They live near the bottom of clear streams, darting quickly about when feeding or when disturbed.
They prey on such small aquatic animals as insects and worms. Like other members of the family, darters possess two dorsal fins.
Their size ranges from 2. Some darters are among the most brightly coloured fishes in North America, the males becoming especially colourful during the spring breeding season.