河南鲤科鱼类咽骨咽齿的比较研究(五)

<正> 本文记述(鱼句)亚科鱼类11属20种,鲅亚科鱼类2属2种,现将对其咽骨咽齿的比较研究结果予以报导。(鱼句)亚科Gobioninae,咽骨的长宽度常有变异。体长为骨长的12.0一27.0倍,骨长为骨宽的2.5~7.0倍。前肢略长于或等于后肢。前后角圆钝或后角不明显。咽齿1~3列,内列5齿,中列2一3齿,外列1齿,各齿光滑无锯齿。

THE COMPARATIYE STUDIES OF THE PHARYNGEAL BONES AND THEIR TEETH OF GOBIONINAE IN HENAN

The present paper deals with the morphology of pharyngeal bonesard their teeth in 11 genera 20 species and subspecies of Gobioninae,in 2genera 2 species of Barbinae。The characteristics of Gobioninae are summarized as followsPharyngeal' bones are elongate or broad,body length is 12.0—27.0times the bone length,bone length is 2.5—7.0 times the width,Anteriorlimb is longer than or equal to the posterior one,Anterior angle isstout but posterior angle is obscure,Pharyngeal teeth have1—3rows,the inner row has 5 teeth,the middle row has2—3teeth,the outer row has 1 tooth,the side of the teeth are smoothand the grinding surface is rather narrow。Key to genera and speciesof Gobioninae1(10)Teeth one-rowed 2(5)Bone length is over 23 times body length3(4)Anterior limb is shorter than posterior one in length,flat andwidth Saurogobio dabryi Bleeker4(3)Anterior limb is shorter than or equal to posterior one in length,gth,usually Saurogobio dumerili Bleeker5(2)Bone length is below 23 times,body length6(9)Length of anterior edntulous process is shorter than posteriorone,with groove in external or internla margin of anterior limb7(8)With a groove in internal margin of anterior limb,backwardreaching the middle part of posterior edentulous processAbbottina rivularis(Basil)8(7)With a groove in external margin of anterior limb,not reaehingto the posterior edentulous processPsudorasbora parva(T.et s.)9(6)Anterior edentulous process is equal to the posterior one,withgrooves in external and internal margin of anterior limbCoreius heterodon(Bleeker)10(1)Teeth two-rowed11(12)There is one tooth in outer rowSarcocheilichthys nigripinnis nigripinnis Günther12(11)There are two teeth in outer row13(18)Breadth of pitted surface is over 55% of the breadth of bone14(15)Head length is over 20 times bone widthGobio tenuicorpus Mori15(14)Head length is below 20 times bone width16(17)Breadth of pitted surface is over 65% of the breadth of boneThe 4—5 teeth of inner row are particularly recurvedRhinogobio typus Bleeker17(16)Breadth of pitted surface is below 65% of the breadth of bone.The 3—5 teeth of inner row are particularly recurredRhinogobio nasutus(Kessler)18(13)Breadth of pitted surface is below 55% of the breadth of bone.Pseudogobio vaillanti vaillanti(Sauvage)19(12)There are three teeth in outer row20(23)With grooves in internal and external margin of anterior limb21(22)The 3—4 teeth of inner row are equal in size,the 2—3 teethof outer row are particularly bentGobio gobio cynocephalus Dybowski 22(21)The 4—5 teeth of inner row are equal in size,the 2—3 teeth ofouter row are bent Gobio coriparoidesNichols23(20)With or without grooves in external margin of anterior limb24(25)The second tooth of inner row looks like mushroom.The 1—3teeth of outer row are equal in sizeGnathopogon argentatus(S et D)25(24)The second tooth of inner row not looks like mushroom26(27)The 1—2 teeth of outer row are erual in sizeGnathopogon intermedius Nichols27(26)The first tooth of outer row is larger,the 2—3 teeth are equal in size28(29)The pitted surface of anterior is opposite the second tooth ofinner row.The grinding surface of 2—3 teeth of inner row are deeperGnathopon wolterstorffi(Regan)29(28)The pitted surface of anterior is opposite the third tooth of innerrow,The grinding surfaee of 2—5 feeth of inner row are deeperGnathopon polytaenia(Nichols)30(10)Teeth three-rowed31(32)With notch at the tip of external margin of the anterior limbHemibarbus maculatus Bleeker32(31)Without notch at the tip of external margin of the anterior33(34)Length of bone is 16.5—17.0 times body lengthHemibarbus longirostris(Regan)34(33)Length of bone is below 15.0 times body length35(36)Length of anterior limb is shorter than the posterior one.Thereis a' larger round or square pit opposite the second tooth of theinner row Hemibarbus labeo(Pallas)36(35)Length of anterior limb is equal to the posterior one.There isa large triangle pit opposite the second tooth of the inner rowBelligobio nummifer(Boullenger)