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out by me under the supervision of Prof. U.G. De A. Fdirisinghe, Mr. R. Pethiyagada and Dr.

Figure 2 out by me under the supervision of Prof. U.G. De A. Fdirisinghe, Mr. R. Pethiyagada and Dr.

Related Figures (61)

Fig. 3.2. Methodology for taking mensural data (modified Conway et al., 2011).
Fig. 3.2. Methodology for taking mensural data (modified Conway et al., 2011).
Sinharaja World Heritage Site. neliya forest. The fifth site (Site 5), Kosmulla located in the
Sinharaja World Heritage Site. neliya forest. The fifth site (Site 5), Kosmulla located in the
selected sites
selected sites
to the lateral tip of the supracleithrum (vs. to the distal end of dorsal part of the (broken at apex; lacking coracoid foramen); E, dorsal view of pelvic girdle; F, dorsa Horadandia distinguished from Rasboroides in having the attachment of Baudelot’s ligament
to the lateral tip of the supracleithrum (vs. to the distal end of dorsal part of the (broken at apex; lacking coracoid foramen); E, dorsal view of pelvic girdle; F, dorsa Horadandia distinguished from Rasboroides in having the attachment of Baudelot’s ligament
y having caoncave (vs. convex) anterior boarder of cleithrum in ventral view (Fig. 4.4D) fin, C, caudal fin; D, dorsal view of pectoral girdle; E, dorsal view of pelvic girdle showing deeply bifurcate basipterygium (bp); F, lateral view of Weberian apparatus (wb)
y having caoncave (vs. convex) anterior boarder of cleithrum in ventral view (Fig. 4.4D) fin, C, caudal fin; D, dorsal view of pectoral girdle; E, dorsal view of pelvic girdle showing deeply bifurcate basipterygium (bp); F, lateral view of Weberian apparatus (wb)
maxillae (pp, palatine process); J, lateral view of right dentary and anguloarticular (co.
maxillae (pp, palatine process); J, lateral view of right dentary and anguloarticular (co.
yoarder of cleithrum in ventral view (Fig. 4.6D Fig. 4.6. Osteology of Rasboroides pallidus (A-C of WHT 11101, 20.0 mm SL; D-F of WHT
yoarder of cleithrum in ventral view (Fig. 4.6D Fig. 4.6. Osteology of Rasboroides pallidus (A-C of WHT 11101, 20.0 mm SL; D-F of WHT
pallidus (n= 5); Rasboroides new species (n= 2); Horadandi atukorali (n= 3); and H. brittani (n= 2)
pallidus (n= 5); Rasboroides new species (n= 2); Horadandi atukorali (n= 3); and H. brittani (n= 2)
Fig. 4.9. Horadandia atukorali, living specimen, from Hamilton canal, Sri Lanka (Courtesy streak on body. snout and on posterior one-third of head small and widely spaced. A dark-brown mid-lateral
Fig. 4.9. Horadandia atukorali, living specimen, from Hamilton canal, Sri Lanka (Courtesy streak on body. snout and on posterior one-third of head small and widely spaced. A dark-brown mid-lateral
Table 4.3. Meristics of Horadandi atukorali (n= 11) and H. brittani (n= 10).
Table 4.3. Meristics of Horadandi atukorali (n= 11) and H. brittani (n= 10).
supraorbitals not reduced, its length ~50% of orbital diameter (Fig. 4.10D); four infraorbitals, Palatine process on the maxilla with a distinct projection pointing dorsally (Fig. 4.10C)
supraorbitals not reduced, its length ~50% of orbital diameter (Fig. 4.10D); four infraorbitals, Palatine process on the maxilla with a distinct projection pointing dorsally (Fig. 4.10C)
Rasboroides nigromarginatus; E, Rasboroides pallidus; F, Rasboroides new species
Rasboroides nigromarginatus; E, Rasboroides pallidus; F, Rasboroides new species
(Deraniyagala, 1943; Pethiyagoda, 1991; Ott, 2009) (Fig. 4.12). Baddegama, Madola (Southern Province), Mundel and Puttalam (Northwestern Province) Attidiya, Colombo, Gampaha, Dombagaskanda, Veyangoda (Western Province), Wakwella
(Deraniyagala, 1943; Pethiyagoda, 1991; Ott, 2009) (Fig. 4.12). Baddegama, Madola (Southern Province), Mundel and Puttalam (Northwestern Province) Attidiya, Colombo, Gampaha, Dombagaskanda, Veyangoda (Western Province), Wakwella
hyaline. scales, snout and posterior one-third of the head. A dark lateral streak present on the body; all the fins hyaline. In preserved samples, overall colour dusky white with indistinct melanophores on body
hyaline. scales, snout and posterior one-third of the head. A dark lateral streak present on the body; all the fins hyaline. In preserved samples, overall colour dusky white with indistinct melanophores on body
(co, coronoid process); C, lateral view of left maxillae (pp, palatine process); D, dorsal view of cranium (so, supraocular; f, frontal).
(co, coronoid process); C, lateral view of left maxillae (pp, palatine process); D, dorsal view of cranium (so, supraocular; f, frontal).
orbital diameter, body depth and inter-narial width (Appendix 3).
orbital diameter, body depth and inter-narial width (Appendix 3).
‘ig. 4.16. Rasboroides vaterifloris. A, B (females), living specimens, from Gilimale (in the syntypes, male (above) and female (below); Sri Lanka: Kalu River: Illukwatta (Courtesy:
‘ig. 4.16. Rasboroides vaterifloris. A, B (females), living specimens, from Gilimale (in the syntypes, male (above) and female (below); Sri Lanka: Kalu River: Illukwatta (Courtesy:
Table 4.4. Morphometric data of Rasboroides vaterifloris (n= 10) and R. nigromarginatus (n= 12).
Table 4.4. Morphometric data of Rasboroides vaterifloris (n= 10) and R. nigromarginatus (n= 12).
4.1.2.2.1. 2. Description of R. vaterifloris (Osteology).
4.1.2.2.1. 2. Description of R. vaterifloris (Osteology).
coronoid process on dentary (Fig. 4.17A); dorsal boarder of operculum even (Fig. 4.17B).
coronoid process on dentary (Fig. 4.17A); dorsal boarder of operculum even (Fig. 4.17B).
basin (Fig. 4.18). water stream. As presently understood, however, the species is restricted to the Kalu River
basin (Fig. 4.18). water stream. As presently understood, however, the species is restricted to the Kalu River
Fig. 4.19. Rasboroides nigromarginatus. A, living male specimen, from Atweltota, Sri Lanka
Fig. 4.19. Rasboroides nigromarginatus. A, living male specimen, from Atweltota, Sri Lanka
with a concavity next to symphyseal knob (Fig. 4.20A); concavity before the coronoid
with a concavity next to symphyseal knob (Fig. 4.20A); concavity before the coronoid
hypurals present.
hypurals present.
the origin of anal fin. Dorsal fin origin located halfway between snout-tip and hypural notch forest reserve; B, not preserved, male, in life; Bentara River, Pituwala; C, WHT 9703.
the origin of anal fin. Dorsal fin origin located halfway between snout-tip and hypural notch forest reserve; B, not preserved, male, in life; Bentara River, Pituwala; C, WHT 9703.
Table 4.6. Morphometric data of Rasboroides pallidus (n= 15) and Rasboroides new species (n= 18).
Table 4.6. Morphometric data of Rasboroides pallidus (n= 15) and Rasboroides new species (n= 18).
elevated (Fig. 4.5J, 4.23A); two lateral processes on the kinethmoid; coronoid process of dentary (Fig. 4.5J, 4.23A); superior border of anguloarticular convex,
elevated (Fig. 4.5J, 4.23A); two lateral processes on the kinethmoid; coronoid process of dentary (Fig. 4.5J, 4.23A); superior border of anguloarticular convex,
Fig. 4.24. Distribution of Rasboroides pallidus (type locality, closed circle) in Sri Lanka.
Fig. 4.24. Distribution of Rasboroides pallidus (type locality, closed circle) in Sri Lanka.
mm SL, female, in life; Sri Lanka: Walawe River basin: Suriyakanda (Photographs,
mm SL, female, in life; Sri Lanka: Walawe River basin: Suriyakanda (Photographs,
Fig. 4.26. Rasboroides new species. A, Lateral views of dentary (co, coronoid process); B, pleurostyle; parahypural and first hypural fused posteriorly; six hypurals present.
Fig. 4.26. Rasboroides new species. A, Lateral views of dentary (co, coronoid process); B, pleurostyle; parahypural and first hypural fused posteriorly; six hypurals present.
Components Analysis of four species of Rasboroides identified by the present study.
Components Analysis of four species of Rasboroides identified by the present study.
Fig. 4.29. Distribution of Rasboroides pallidus in the study sites of Gin River: sites lacked the specific habitat requirements of R. pallidus (Fig. 4.29) selected. However, this species was observed in two sites only, inferring that the other three present). Madola (below), Homadola (middle), and Kosmulla (above) in black
Fig. 4.29. Distribution of Rasboroides pallidus in the study sites of Gin River: sites lacked the specific habitat requirements of R. pallidus (Fig. 4.29) selected. However, this species was observed in two sites only, inferring that the other three present). Madola (below), Homadola (middle), and Kosmulla (above) in black
Fig. 4.30. Cumulative number of individuals observed during the study period at each site. compared with the other sites (Fig. 4.30)
Fig. 4.30. Cumulative number of individuals observed during the study period at each site. compared with the other sites (Fig. 4.30)
Fig. 4.32. Mean abundance of R pallidus in the two sites during the study period. Rasboroides pallidus can be considered as a seasonal spawner (Fig. 4.33), because there was
Fig. 4.32. Mean abundance of R pallidus in the two sites during the study period. Rasboroides pallidus can be considered as a seasonal spawner (Fig. 4.33), because there was
Fig. 4.33: Number of individuals (including juveniles) of Rasboroides pallidus observed in
Fig. 4.33: Number of individuals (including juveniles) of Rasboroides pallidus observed in
Kato et al., 2009). pH gradually decreased with the onset of monsoonal rains (Fig. 4.35).
Kato et al., 2009). pH gradually decreased with the onset of monsoonal rains (Fig. 4.35).
Fig. 4.36. Fluctuations of water depth in the selected sites (January-December).
Fig. 4.36. Fluctuations of water depth in the selected sites (January-December).
Fig. 4.37. Variations [n the flow rate in different sampling sites throughout the study period of stream flow as described by Mathur & Sajwan (1978).
Fig. 4.37. Variations [n the flow rate in different sampling sites throughout the study period of stream flow as described by Mathur & Sajwan (1978).
Table 4.7. Percentage of canopy cover and substrate categories in the selected sites
Table 4.7. Percentage of canopy cover and substrate categories in the selected sites
Fig. 4.38. Variation of turbidity throughout the study period (January-December) either average or a poor condition. During the dry months, turbidity was low (Fig. 4.38) Turbidity rapidly changed due to rains. When heavy rains occurred, visibility changed to
Fig. 4.38. Variation of turbidity throughout the study period (January-December) either average or a poor condition. During the dry months, turbidity was low (Fig. 4.38) Turbidity rapidly changed due to rains. When heavy rains occurred, visibility changed to
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Fish BiologyEcology of freshwater fishFreshwater fish taxonomy
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