Alexandre P. Marceniuk & Naércio A. Menezes, 2007, Systematics of the family Ariidae (Ostariophysi, Siluriformes), with a redefinition of the genera., Zootaxa 1416, pp. 1-126: 74-75

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Nemapteryx  ZBK  Ogilby, 1908

(fig. 65)

Nemapteryx  ZBK  Ogilby, 1908: 3, 10. Type species: Arius stirlingi  ZBK  Ogilby, 1898. Type by original designation and also monotypy. Gender: feminine.

Diagnosis. Distinguished from all other members of the Ariidae  by the combination of the following shared characters: (1) mesethmoid posterior branches very long, limiting more than half of the anterior cranial fontanel [shared with Cathorops  (with exception of C. dasycephalus  )]; (2) lateral processes of vomer very wide (shared with Arius  ZBK  , Aspistor  ZBK  , Bagre  , Batrachocephalus  ZBK  , Cinetodus  ZBK  , Galeichthys  ZBK  , Notarius planiceps  , Osteogeneiosus  ZBK  , Pachyula  ZBK  , Plicofollis tenuispinis  , P. platystomus  , Potamosilurus  and Sciades  ); (3) vomerine tooth plates present [shared with Aspistor  ZBK  , Bagre  , Brustiarius  ZBK  , Cathorops dasycephalus  , Cochlefelis  ZBK  , Galeichthys  ZBK  , Genidens  ZBK  (with exception of G. genidens  ), Hemiarius  ZBK  , Neoarius  ZBK  , Netuma  , Notarius  ZBK  , Plicofollis  ZBK  (with exception of P. platystomus  ), Potamosilurus  (with exception of P. velutinus  ) and Sciades  ]; (4) medial groove of neurocranium present [shared with Arius  ZBK  , Bagre  , Batrachocephalus  ZBK  , Brustiarius  ZBK  , Carlarius  , Cathorops  , Cochlefelis  ZBK  , Cryptarius  ZBK  , Galeichthys  ZBK  , Genidens  ZBK  , Ketengus  ZBK  , Neoarius  ZBK  , Netuma  , Notarius planiceps  , Osteogeneiosus  ZBK  , Plicofollis  ZBK  , Potamarius  ZBK  , Potamosilurus  (with exception of P. latirostris  ) and Sciades  ]; (5) face for articulation between palatine and lateral ethmoid at central portion of former bone (shared with Brustiarius  ZBK  , Cochlefelis  ZBK  , Galeichthys  ZBK  and Neoarius  ZBK  ); (6) crest delimiting contact area between mesethmoid and premaxillary beginning at two thirds latero-anterior portion of former bone (shared with Arius  ZBK  , Bagre  , Batrachocephalus  ZBK  , Cochlefelis  ZBK  , Hemiarius  ZBK  , Netuma  and Potamosilurus velutinus  ).

Supplementary morphological characters. Cephalic shield granulated visible under the skin; lateral ethmoid and frontal limiting a large fenestra evident under the skin; medial groove of neurocranium very distinct, limited by frontal bones and/or on supraoccipital; posterior cranial fontanel well differentiated, large and oval shaped; fenestra limited by supraoccipital, pterotic and sphenotic absent; fossa limited by pterotic, supracleithrum and extrascapular relatively large; epioccipital not invading dorsal portion of cephalic shield; occipital process funnel shaped, moderately long, its posterior part conspicuously narrower than its base; anterior and median nuchal plates fused and indistinct, forming a structure of semi-lunar aspect; tooth plates associated with vomer round; accessory tooth plates present, bearing conical teeth; maxillary barbel fleshy and cylindrical; two pairs of mental barbels; base of adipose fin moderately long, about half as long as anal-fin base; lateral line not bifurcated at caudal region, reaching base of caudal-fin upper lobe; cleithrum narrow, with second dorsal process on its upper portion; posterior cleithral process short, distinct from second dorsal process of cleithrum.

Distribution and habitat. Southern New Guinea and northern Australia, marine and brackish waters.