Toxotes lorentzi


Toxotes lorentzi is a tropical freshwater fish found in streams and swamps of the Northern Territory of Australia, Irian Jaya, and Papua New Guinea. It was first named by Weber in 1910, and is commonly known as the primitive archerfish or Lorentz's archerfish.

Taxonomy and description

Toxotes lorentzi is believed to range in length from, though a specimens reaching in length have been observed. T. lorentzi normally has five dorsal spines and is a silvery tan or brown colour, with a dark pectoral base. While bars and spots are distinct features of other members of the genus, T. lorentzi usually has no markings, or else very faint bars on its sides. T. lorentzi usually has three gill rakers on the lower limb of its first branchial arch, but two and four are also possible. It usually has fewer than 38 scales on its lateral line.
T. lorentzi was described by Max Carl Wilhelm Weber in 1910. It was initially believed that T. lorentzi is the most "primitive" species of archerfish due to its lack of markings and straight dorsal line, a view that Weber endorsed; Gilbert Whitley, who shared this view, reclassified T. lorentzi under the new monotypic genus Prototoxotes which he erected for it in 1950. However, later authors disputed the assertion that T. lorentzi is more primitive and simply consider Prototoxotes a synonym of Toxotes, where T. lorentzi is usually placed.

Behaviour

Like other archerfish, T. lorentzi feeds on terrestrial insects by shooting a stream of water onto low-hanging vegetation at the edges of streams and capturing the insects as they fall into the water. Such insects are believed to make up a significant portion of its diet.

Distribution and habitat

The range of Toxotes lorentzi includes a handful of areas in the Northern Territory of Australia: the Timor Sea drainage at Yam Creek, the Finniss River, and Sawcut Creek, Deaf Adder Creek, and Baroalba Creek, part of the South Alligator River system. In addition, it is also common in the Fly River Delta. Its range also includes the Balima River and the Merauke River of central southern New Guinea.
T. lorentzi generally inhabits swamps and the edges of streams with vegetative cover. It is most commonly observed in surface waters.
Because Toxotes lorentzi has wide distribution and no major widespread threats are known, IUCN considers it to be of "Least Concern".