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Taste 19. MorPHOMETRIC AND MERISTIC CHARACTERS IN STEATOCRANUS. 1MCZ 50555 (R & S 41). 2 MCZ 50480 (R & S 38). ® MCZ 50557-7 (holotype and paratypes). *MCZ 50585-6 (holotype and paratypes). ®MCZ 505834 boltype ad paratypes). ® AMNH 12358 and 12449 (holotype and paratype of Steatocranus elongatus). 7 MCZ 48003 (Kinsuka). § UMMZ 195059 (Volta River it osombo).

Table 18 Taste 19. MorPHOMETRIC AND MERISTIC CHARACTERS IN STEATOCRANUS. 1MCZ 50555 (R & S 41). 2 MCZ 50480 (R & S 38). ® MCZ 50557-7 (holotype and paratypes). *MCZ 50585-6 (holotype and paratypes). ®MCZ 505834 boltype ad paratypes). ® AMNH 12358 and 12449 (holotype and paratype of Steatocranus elongatus). 7 MCZ 48003 (Kinsuka). § UMMZ 195059 (Volta River it osombo).

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Apsstract. Rapids habitats at nine localities along the mainstream of the Zaire River between Kinshasa and Matadi were fished extensively with rotenone during low water, yielding over 7000 specimens belonging to 129 species. A total of 17 families are represented, the most speciose being Mormyridae (19 species), Cyprinidae (19), Cichlidae (17), and Mochokidae (16). Limnologi- cal and ecological observations are reported for TYSON R. ROBERTS’ and DONALD J. STEWART?
Apsstract. Rapids habitats at nine localities along the mainstream of the Zaire River between Kinshasa and Matadi were fished extensively with rotenone during low water, yielding over 7000 specimens belonging to 129 species. A total of 17 families are represented, the most speciose being Mormyridae (19 species), Cyprinidae (19), Cichlidae (17), and Mochokidae (16). Limnologi- cal and ecological observations are reported for TYSON R. ROBERTS’ and DONALD J. STEWART?
1Total (Methyl Orange) alkalinity in grains/gal CaCO,. TABLE 1. TEMPERATURES AND WATER CHEMISTRY FOR NORTHERN AND SOUTHERN TRIBUTARIES ANI MAINSTREAM OF ZAIRE RIVER BETWEEN KINSHASA AND Marapl, 23 JuNE-l1 SEPTEMBER 1973.
1Total (Methyl Orange) alkalinity in grains/gal CaCO,. TABLE 1. TEMPERATURES AND WATER CHEMISTRY FOR NORTHERN AND SOUTHERN TRIBUTARIES ANI MAINSTREAM OF ZAIRE RIVER BETWEEN KINSHASA AND Marapl, 23 JuNE-l1 SEPTEMBER 1973.
TaBLE 2. NUMBERS OF SPECIES AND OF SPECIMENS OF FISHES TAKEN AT NINE COLLECTING LOCALITIES IN THE RAPIDS OF THE LOwER ZAIRE RIVER.
TaBLE 2. NUMBERS OF SPECIES AND OF SPECIMENS OF FISHES TAKEN AT NINE COLLECTING LOCALITIES IN THE RAPIDS OF THE LOwER ZAIRE RIVER.
-igure 1. Map of Lower Zaire River, showing principal localities discussed in this paper
-igure 1. Map of Lower Zaire River, showing principal localities discussed in this paper
b. At Bulu. Mainstream to the left. About three or four weeks before river started to rise. A large collec- tion was made at narrow end of large pool near center of picture (R & S 29). This pool is the type locality of Notoglanidium pallidum, Lamprologus lethops, Mastacembelus crassus, and Mastacembelus latens. 15 July. c. Opposite Tadi. Near type locality of Chrysichthys helicophagus and Gymnnalbes nops (R & S 35). 21 July. d. About 5 km upstream from Kinganga (R & S 28). 12 July. e. A few kilometers upstream from Inga hydroelectric installation, on opposite side of river. Near type locality of Chiloglanis carnosus, Nanochromis parilus, Nanochromis splendens, and Teleogramma depressum (R & S&S 38). 1 August. f. About a kilometer directly West of Inga hydroelectric installation. Portion of long channel from which bulk of specimens at R & S 41 were collected. This channel is the type locality of Mormyrus cyaneus, Mormyrus ft ee a Ge aS ee ee eS ee ae ese eee ene ne my ee Cea men lca oy
b. At Bulu. Mainstream to the left. About three or four weeks before river started to rise. A large collec- tion was made at narrow end of large pool near center of picture (R & S 29). This pool is the type locality of Notoglanidium pallidum, Lamprologus lethops, Mastacembelus crassus, and Mastacembelus latens. 15 July. c. Opposite Tadi. Near type locality of Chrysichthys helicophagus and Gymnnalbes nops (R & S 35). 21 July. d. About 5 km upstream from Kinganga (R & S 28). 12 July. e. A few kilometers upstream from Inga hydroelectric installation, on opposite side of river. Near type locality of Chiloglanis carnosus, Nanochromis parilus, Nanochromis splendens, and Teleogramma depressum (R & S&S 38). 1 August. f. About a kilometer directly West of Inga hydroelectric installation. Portion of long channel from which bulk of specimens at R & S 41 were collected. This channel is the type locality of Mormyrus cyaneus, Mormyrus ft ee a Ge aS ee ee eS ee ae ese eee ene ne my ee Cea men lca oy
TABLE 3. NUMBER OF SPECIMENS AND STANDARD LENGTH TO NEAREST MM OF ALL SPECIES OBTAINED AT NINE COLLECTING Lower Zaire River. Species printed in boldface are dealt with in the systematics section of this paper. These specimens ha’ numbers MCZ 50100-50565, 50582 in the fish collection of the Museum of Comparative Zoology, excepting the 550-mm Lates 1 28, which was not preserved.
TABLE 3. NUMBER OF SPECIMENS AND STANDARD LENGTH TO NEAREST MM OF ALL SPECIES OBTAINED AT NINE COLLECTING Lower Zaire River. Species printed in boldface are dealt with in the systematics section of this paper. These specimens ha’ numbers MCZ 50100-50565, 50582 in the fish collection of the Museum of Comparative Zoology, excepting the 550-mm Lates 1 28, which was not preserved.
TABLE 8. PROPORTIONAL MEASUREMENTS, SNOUT CURVATURE, AND COUNTS IN CAMPYLOMORMYRUS RHYNCHOPHORUS.
TABLE 8. PROPORTIONAL MEASUREMENTS, SNOUT CURVATURE, AND COUNTS IN CAMPYLOMORMYRUS RHYNCHOPHORUS.
TABLE 9. CAMPYLOMORMYRUS RHYNCHOPHORUS. VARIATION IN ANAL FIN RAY COUNTS COMPARED TC SNOUT LENGTH (SPECIMENS OVER 100 MM).
TABLE 9. CAMPYLOMORMYRUS RHYNCHOPHORUS. VARIATION IN ANAL FIN RAY COUNTS COMPARED TC SNOUT LENGTH (SPECIMENS OVER 100 MM).
Figure 2. Alestes, squamation at base of anal fin: a. imberi, 53 mm; b. compius, 55 mm.
Figure 2. Alestes, squamation at base of anal fin: a. imberi, 53 mm; b. compius, 55 mm.
Tasie 11. Comparison or B. YSEUXI AND OTHER BRYCONAETHIOPS.
Tasie 11. Comparison or B. YSEUXI AND OTHER BRYCONAETHIOPS.
Figure 3. Bryconaethiops, premaxillary dentition: a. microstoma, 65 mm; b. boulengeri, 57 mm; c. yseuxi, 57 mm. Labeo lividus is apparently closely re- lated to L. barbatus, which differs from it in having barbels dark or black in color, anterior barbel frequently as long or longer than posterior barbel, both barbels usually longer than eye diameter; eye more nearly superolateral in position; tubercles on head more strongly developed; and adults with back and sides pale-colored or dirty white, with indistinct darker vertical marks on the scales. of microstoma; Poll (1939), evidently with- out having examined the holotype, con- cluded that it must be a synonym of either microstoma or macrops.
Figure 3. Bryconaethiops, premaxillary dentition: a. microstoma, 65 mm; b. boulengeri, 57 mm; c. yseuxi, 57 mm. Labeo lividus is apparently closely re- lated to L. barbatus, which differs from it in having barbels dark or black in color, anterior barbel frequently as long or longer than posterior barbel, both barbels usually longer than eye diameter; eye more nearly superolateral in position; tubercles on head more strongly developed; and adults with back and sides pale-colored or dirty white, with indistinct darker vertical marks on the scales. of microstoma; Poll (1939), evidently with- out having examined the holotype, con- cluded that it must be a synonym of either microstoma or macrops.
TABLE 13. PROPORTIONAL MEASUREMENTS AND COUNTS IN GYMNALLABES TIHONI AND NOPS.
TABLE 13. PROPORTIONAL MEASUREMENTS AND COUNTS IN GYMNALLABES TIHONI AND NOPS.
Figure 4. Atopochilus. Number of mandibular tooth families plotted against standard length. & guentheri, Lower Zaire R. (MCZ 50147, 50194, 50300, 50381, 50463 and 50538); JJ royauxi, Lower Zaire R. (MCZ 47989, 50148 and 50539); royauxi, Ubangui (MCZ 48357 and 48358).
Figure 4. Atopochilus. Number of mandibular tooth families plotted against standard length. & guentheri, Lower Zaire R. (MCZ 50147, 50194, 50300, 50381, 50463 and 50538); JJ royauxi, Lower Zaire R. (MCZ 47989, 50148 and 50539); royauxi, Ubangui (MCZ 48357 and 48358).
Figure 5. Mochokidae, oral disc and dentition: a. Atopochilus guentheri, 58 mm; b. Chiloglanis congicus, 60 mm; c. Chiloglanis carnosus, 61 mm.
Figure 5. Mochokidae, oral disc and dentition: a. Atopochilus guentheri, 58 mm; b. Chiloglanis congicus, 60 mm; c. Chiloglanis carnosus, 61 mm.
TaBLe 14, DIFFERENCES BETWEEN TWO SPECIES oF ATOPOCHILUS FROM THE LOWER ZAIRE RIVER.
TaBLe 14, DIFFERENCES BETWEEN TWO SPECIES oF ATOPOCHILUS FROM THE LOWER ZAIRE RIVER.
described species which differs from all other known cichlids in being cryptophthal- mic and depigmented. TABLE 16. MORPHOMETRIC AND MERISTIC CHAR- ACTERS OF LAMPROLOGUS LETHOPS.
described species which differs from all other known cichlids in being cryptophthal- mic and depigmented. TABLE 16. MORPHOMETRIC AND MERISTIC CHAR- ACTERS OF LAMPROLOGUS LETHOPS.
1RGMC 1045 (lectotype). 2MCZ 48004, Boende; MCZ 50588, Bandundu. *MCZ 50551 (holotype); MCZ 50552 (paratypes). +MCZ 5047 50475 (paratypes). 5MCZ 50341 (holotype); MCZ 50342 (paratypes). *MCZ 50476 (holotype); MCZ 50477 (paratypes). 7 Number of : row extending dorso-anteriorly from base of third anal spine to base of dorsal fin.
1RGMC 1045 (lectotype). 2MCZ 48004, Boende; MCZ 50588, Bandundu. *MCZ 50551 (holotype); MCZ 50552 (paratypes). +MCZ 5047 50475 (paratypes). 5MCZ 50341 (holotype); MCZ 50342 (paratypes). *MCZ 50476 (holotype); MCZ 50477 (paratypes). 7 Number of : row extending dorso-anteriorly from base of third anal spine to base of dorsal fin.
Figure 7. Steatocranus, dentition: a. gibbiceps, 74 mm; b. casuarius, 66 mm; c. glaber, 43 mm; d. ubanguiensis, 45 mm; e. mpozoensis, 50 mm; f. tinanti, 36 mm.
Figure 7. Steatocranus, dentition: a. gibbiceps, 74 mm; b. casuarius, 66 mm; c. glaber, 43 mm; d. ubanguiensis, 45 mm; e. mpozoensis, 50 mm; f. tinanti, 36 mm.
Tasie 20. COMPARISON OF THE NOMINAL SPECIES STEATOCRANUS ELONGATUS NicHOLS AND LAMONTE 1934 wirH ITS SENIOR SYNONYM STEATOCRANUS ROUX! (PELLEGRIN) 1928.
Tasie 20. COMPARISON OF THE NOMINAL SPECIES STEATOCRANUS ELONGATUS NicHOLS AND LAMONTE 1934 wirH ITS SENIOR SYNONYM STEATOCRANUS ROUX! (PELLEGRIN) 1928.
TasLe 21. MORPHOMETRIC AND MERISTIC CHARACTERS IN TELEOGRAMMA.
TasLe 21. MORPHOMETRIC AND MERISTIC CHARACTERS IN TELEOGRAMMA.
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