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Pseudoplatystoma reticulatum (Eigenmann & Eigenmann, 1889) ZBK

(Figure 27, Table 8)

Pseudoplatystoma fasciatum reticulatum Eigenmann & Eigenmann ZBK , 1889:30. Type and Locality: Negro River [Brazil]. Holotype: MCZ 23813.

Geographic distribution: Central Amazon and Paraná River in Argentina, Bolivia, Brazil, Paraguay, and Uruguay (Fig. 25).

Holotype : MCZ 23813 , 605 mm SL, Negro River, between Manaus and Moura , 3°8'N , 59°55'W , state of Amazonas , Brazil , N. Dexter and L. Agassiz , 12 October 1865 .

Material examined: ANSP 53867 , (2), Descalvados , Matto Grosso , Paraguay River . J. A. Rehn , September1931 . BMNH 1934-820113120 , (2), Paraguay River, near Asuncion , Paraguay , purchased by G. Schouten , 1934 . FMNH 96053 , (1), Delcalvados , Matto Grosso , Paraguay River , Brazil , Schmidt et al. , 1926 . FMNH 58039 , (1), Puerto Suarez , Bolivia , J. D. Haseman , 6 May 1909 . FMNH 72656 , (1), Aregua, Paraguay River , 7 April 1909 . USNM 181766 , (1), Paraguay River, Asuncion bay, near Asuncion , Paraguay , C. J. Brown , 27 December 1956 . USNM 002114 , (1), Paraguay River .

FIGURE 27. Pseudoplatystoma reticulatum (Eigenmann & Eigenmann, 1889) ZBK , NRM 14068, 460.1 mm SL. Scale 10 cm.

Diagnosis : A species of Pseudoplatystoma ZBK distinguished by a combination of the following features: loop-like dark bars forming a reticulating pattern, never straight as in P. fasciatum , P. orinocoense and P. punctifer ; dark, loop -like bars join those in the dorsal region of the body forming distinct cells; longer loop - like dark bars, extending far below the lateral line; head shows either spots or loops; 42-43 vertebrae; anal fin always with spots; no clear demarcation between dark dorsal and pale ventral regions; lower jaw pointed.

Description: Maximum recorded length 605 mm TL. Viewed dorsally, head somewhat pointed on the anterior margin; dorsal lip expanding toward the midline. Generally, individuals are stout. Dark pigmentation on dorsal and lateral region of body extends below lateral line. No clear delimitation between pale and dark pigmentation of body. Dark loop -like bars all over the dark area from posterior opercular flap to caudal peduncle. Head with spots and bars from tip to nape. Dorsal fin spine and rays with spots. Anal fin spotted on each individual examined. Pectoral and pelvic fins dark dorsally, pale ventrally, with few spots; some individuals with dusky posterior margins on pectoral fins. Adipose fin with few spots (10-13 spots). Area around dorsal procurrent caudal rays with spots, ventral procurrent caudal rays without spots. See Table 9 for a comparison with other species. Color and pattern of adults are shown in Fig. 18.

Etymology: The specific epithet reticulatum refers to the reticulating pigmentation pattern.

TABLE 8. Descriptive measurements of the body size and shape (in mm), and number of vertebrae for P. reticulatum ZBK . Number of individuals measured, 10.

Variables Holotype mean+SD range
Standard length 605 363.7+140.0 193.6-579
Snout-posterior occipital process 250 143.2+49.6 80.6-211.3
Snout-posterior margin of the opercle 238 139.0+47.4 78.7-204.4
Dorsal fin spine length 58 40.3+13.6 22.9-59.9
Pectoral fin spine length 94 54.7+18.3 32.4-83.1
Maxillary barbel length 219 169.3+40.6 120-219.4
Anterior chin barbel length 195 143.7+25.7 109.6-177.2
Insertion maxillary barbel-eye 104 55.7+18.1 32.7-80.3
Insertion maxillary barbel-joint pectoral spine 183 106.9+18.1 59.9-160.8
Insertion maxillary barbel-joint dorsal spine 260 150+52.4 82.7-219.6
Eye-joint pectoral spine 91 58.3+21.4 31.5-89.2
Eye-joint dorsal spine 164 95.3+34.2 51.4-127.4
Joint pectoral spine-joint dorsal spine 114 63.6+23.3 33.2-93.8
Joint pectoral spine-joint first pelvic ray 164 82.0+33.0 34-135.1
Joint pectoral spine-joint last ray of dorsal fin 153 77.3+26.1 41.7-108.7
Joint dorsal spine-joint first pelvic ray 119 65.2+26.5 31.6-101.4
Dorsal fin base length 54 27.7+10.4 13.8-42
Joint first pelvic ray-joint last dorsal fin ray 88 48.5+20.1 22.4-73.2
Joint first pelvic ray-anal fin origin 153 85.3+34.5 44-140.3
Joint first pelvic ray-origin adipose fin 170 90.2+34.9 46.7-138.6
Last dorsal fin ray-anal fin origin 194 102.4+41.0 51.9-163.5
Last dorsal fin ray-adipose fin origin 178 87.2+35.7 44.5-140.8
Anal fin origin-adipose fin origin 68 45.5+17.4 20.8-63.1

...continued

TABLE 8. (continued)

Variables Neotype mean+SD range
Anal fin base length 61 36.1+12.9 20.2-55.7
Anal fin origin-adipose fin terminus 71 41.5+15.2 22.7-64.2
Adipose fin origin-anal fin terminus 84 48.4+17.9 27.8-74.2
Adipose fin length 52 28.4±9.5 11.6-44
Anal fin terminus-adipose fin terminus 44 25.6±9.8 12.9-37.9
Anal fin terminus-ventral caudal fin origin 27 17.3±6.3 8.4-28.1
Anal fin terminus-dorsal caudal fin origin 43 26.9±9.9 13.1-39.5
Adipose fin terminus-ventral caudal fin origin 61 34.8±13.1 17.6-54.2
Adipose fin terminus-dorsal caudal fin origin 43 23.7+8.8 11.9-34.8
Caudal peduncle depth 37 22.9+9.5 10.8-37
Number of vertebrae 42 42.25+0.43 42-43

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