Aspideretes is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of soft-shelled turtles (family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Trionychidae). It has been found to be so closely related to the Burmese Peacock Softshell

Burmese Peacock Softshell

The Burmese peacock softshell is a species of softshell turtle in the Trionychidae family. It is considered to be the one of five species in the genus NilssoniaIt is found only in Myanmar.-References:...

 (Nilssonia formosa) that it is probably better united with this species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 under Nilssonia, the older name. They only differ in having two separate neural plates between the first pleural scale pair of the bony carapace, while these neural plates are fused into one in N. formosa.

As regards ecology

Ecology

Ecology is the scientific study of the relations that living organisms have with respect to each other and their natural environment. Variables of interest to ecologists include the composition, distribution, amount , number, and changing states of organisms within and among ecosystems...

, morphology

Morphology (biology)

In biology, morphology is a branch of bioscience dealing with the study of the form and structure of organisms and their specific structural features....

 distribution and DNA sequence

DNA sequence

The sequence or primary structure of a nucleic acid is the composition of atoms that make up the nucleic acid and the chemical bonds that bond those atoms. Because nucleic acids, such as DNA and RNA, are unbranched polymers, this specification is equivalent to specifying the sequence of...

 data, they form a clade

Clade

A clade is a group consisting of a species and all its descendants. In the terms of biological systematics, a clade is a single "branch" on the "tree of life". The idea that such a "natural group" of organisms should be grouped together and given a taxonomic name is central to biological...

 of peacock softshells that neatly divides into two groups. One contains the Peacock Soft-shelled Turtle and the enigmatic and almost extinct Black Soft-shelled Turtle, and the other all other species (including N. formosa).

4 species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 have been separated in Aspideretes:

• Aspideretes gangeticus
  Aspideretes gangeticus
  The Ganges softshell turtle Aspideretes gangeticus is a species of softshell turtle found in South Asia in rivers such as the Ganges, Indus and Mahanadi.-Description:...
  
  – Ganges softshell turtle
• Aspideretes hurum
  Aspideretes hurum
  Indian peacock softshell turtle Aspideretes hurum is a species of turtle found in Nepal, India, Bangladesh , Pakistan Indian peacock softshell turtle Aspideretes hurum is a species of turtle found in Nepal, India, Bangladesh (in the Brahmaputra and Ganges rivers), Pakistan Indian peacock softshell...
  
  – Indian peacock softshell turtle
• Aspideretes leithii – Leith's softshell turtle
• Aspideretes nigricans – Black softshell turtle