Doiichthys
Creators: name: Alexandre P. Marceniuk
name: Naércio A. Menezes
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Siluriformes
Ariidae
Doiichthys

description: Doiichthys Weber, 1913
Doiichthys Weber, 1913: 532. Type species: Doiichthys novaeguineae Weber, 1913. Type by monotypy. Gender: masculine.
Diagnosis. Doiichthys can be differentiated from all other ariid genera by an extensive list of exclusive (1 to 10) and shared (11 to 21) characters: (1) nasal irregularly shaped; (2) presence of five infraorbitals; (3) premaxillary very wide its length more than 4 times in its width; (4) ceratohyal very long (fig. 46); (5) epihyal unusually long (fig. 46); (6) urohyal medial process very long (fig. 47); (7) first and second epibranchials straight for entire length (fig. 48); (8) first pharyngobranchial located at end of first epibranchial (fig. 48); (9) pharyngeal tooth plates long and narrow (fig. 49); (10) mesial portion of first epibranchial very compressed and wide (fig. 48); (11) mesethmoid medial notch allege and shallow (fig. 50) (shared with Bagre, Cinetodus, Cryptarius, Galeichthys, Ketengus and Pachyula); (12) mesethmoid unusually very large at median portion (fig. 50) (shared with Bagre, Batrachocephalus, Brustiarius, Carlarius, Cochlefelis, Sciades couma, S. emphysetus, S. guatemalensis, S. herzbergii, S. leptaspis, S. passany and S. proops); (13) lateral horn of lateral ethmoid very long and posteriorly directed [shared with Arius (with the exception of Arius caelatus), Plicofollis (with exception of P. platystomus and P. tenuispinis) and Potamarius]; (14) lower crest of occipital process restricted to base of process [shared with Arius, Batrachocephalus, Brustiarius, Carlarius, Cochlefelis, Cryptarius, Galeichthys, Genidens, Ketengus, Neoarius, Netuma, Notarius, Osteogeneiosus, Plicofollis, Potamarius, Potamosilurus and Sciades (with the exception of S. platypogon)]; (15) face for articulation between palatine and lateral ethmoid on anterior portion of former bone (shared with Bagre); (16) metapterygoid twice as high as long (shared with Bagre and Galeichthys); (17) first external branchiostegal ray thin at proximal portion [shared with Arius caelatus, Bagre, Batrachocephalus, Brustiarius, Carlarius, Cochlefelis, Galeichthys, Ketengus, Neoarius, Netuma, Notarius (with exception of N. planiceps), Osteogeneiosus, Sciades emphysetus, S. passany and S. proops]; (18) second external branchiostegal ray less than half width of first ray (shared with Amphiarius, Arius, Aspistor, Bagre, Brustiarius, Carlarius, Cinetodus, Cochlefelis, Genidens, Hemiarius, Nemapteryx, Neoarius, Netuma, Notarius, Osteogeneiosus, Pachyula, Plicofollis, Potamarius, Potamosilurus and Sciades); (19) tip of urohyal medial process bifid (fig. 47) (shared with Bagre); (20) third pharyngobranchial mesially not angulated, shaped like an hourglass (shared with Ketengus and Potamarius grandoculis); (21) crest associated with neural spine of third vertebra weakly developed [shared with Arius, Batrachocephalus, Brustiarius, Carlarius, Cochlefelis, Cryptarius, Galeichthys, Genidens, Ketengus, Neoarius, Netuma, Notarius, Osteogeneiosus, Plicofollis, Potamarius, Potamosilurus and Sciades (with exception of S. platypogon)].
Supplementary morphological characters. Cephalic shield granulated visible under the skin; lateral ethmoid and frontal limiting a very conspicuous large fenestra visible under the skin; medial groove of neurocranium limited by frontals and/or on supraoccipital absent; posterior cranial fontanel well differentiated, very 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 triangular, very long and narrow, narrower toward its posterior part; anterior and median nuchal plates fused and indistinct, forming a structure of semi-lunar aspect; vomerine tooth plates absent; accessory tooth plates small, vertically elongate, 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, second dorsal process located on its upper portion; posterior cleithral process short and distinct from second dorsal process of cleithrum.
Distribution and habitat. Southern New Guinea, brackish waters.
description: Published as part of Alexandre P. Marceniuk & Naércio A. Menezes, 2007, Systematics of the family Ariidae (Ostariophysi, Siluriformes), with a redefinition of the genera., pp. 1-126 in Zootaxa 1416 on pages 57-60