Ophieleotris aporos was originally described by Bleeker (1854: 59) as
Eleotris aporos.After Gill (1863: 270) established the genus
Ophiocara based on
Eleotris ophicephalusValenciennes, a synonym of
Ophiocara porocephala (Valenciennes),
E.aporos wasassigned to the genus
Ophiocara by Bleeker (1877: 27).Aurich (1938: 132) established a new genus
Ophieleotris for
O.aporos based on the study of sensory canal pores, arrangement of pit organs and other characteristics. However, his genus has not been used by others but Whitley (1964: 55), as far as it is known to us.
Our study on comparative morphology on
O.porocephala and
O.aporos with other species, listed on p.74, has revealed further different characteristics between two species and other species, some of which can be used for separating
O.aporos from the genus
Ophiocara and for recognizing the genus
Ophieleotris for
O.aporos.
The characteristics of the two species are listed in Table 1.The most importantcharacteristics of the two genera,
Ophiocara and
Ophieleotris, in comparison with othergenera listed on p.74 are: 1) The presence of a process on the inner side of themaxillary in
Ophiocara (Fig.1A) and the absence in
Ophieleotris (Fig.1B).2) Thepresence of oculoscapular canal from nasal to posttemporal with the pores A to Lexcept for G, of preopercular canal with the pores M to Q and three supratemporalsin
Ophiocara (Fig.2A);the absence of oculoscapular canal and supratemporals andthe presence of short preopercular canal with the pores N'and O'in
Ophieleotris (Fig.2B). 3) 17 segmented caudal fin rays in
Ophiocara and 15 segmented caudal finrays in
Ophieleotris.4) 26 (or rarely 27) vertebrae and the first and second pterygiophoresof the first dorsal fin are inserted between the third and fourth vertebrae in
Ophiocara (Fig.3A);25 vertebrae and the first pterygiophore between the third and fourthvertebrae (Fig.3B) or the first two or three pterygiophores between the fourth andfifth vertebrae in
Ophieleotris (Fig.3C).5) The presence of a short, low longitudinalridge on frontal in
Ophieleotris (Fig.4A);the absence of the ridge in
Ophiocara (Fig.4B).6) The size of a scale of interorbital space of
Ophiocara smaller than thatof caudal peduncle;the size of a scale of interorbital space of
Ophieleotris larger thanthat of caudal peduncle and the largest of all the genera;the size of a scale of caudalpeduncle of both genera is not different.Although
O. porocephala has no suborbitalwhose presence is thought to be an unspecialized characteristic, it has common characteristicsin 1) to 4) with the species with a suborbital, except for the loss of thepore G.Thus
O.porocephala closely resembles the species with a suborbital whichare thought to be the most unspecialized species. As for
O.aporos, when compared with them, it has no characteristics which are as unspecialized as those found in
O.porocephala.
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