Comprehensive Description

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Pseudoplatystoma magdaleniatumn. sp.

(Figure 24, Table 7)

Geographic distribution: Magdalena River drainage, including Cauca River, Colombia (Fig. 25).

Holotype : CAS 19165 , 421.5 mm SL. Soplaviento, town on the dique de Cartagena road to Calamar, Magdalena River , department of Bolivar , Colombia , C. H. Eigenmann , 11 January 1912 .

Paratypes : FMNH 56278 , (1), Calamar, Magdalena River , north of Colombia , C. H. Eigenmann , 16/ 18 January 1912 . FMNH 59324 , (1), Soplaviento, Magdalena River , north of Colombia . C. H. Eigenmann , 13 January 1912 .

Material examined: CAS 15047 , (1), Apulo, Magdalena River , department of Santander , Colombia , M. Gonzales . CAS 150405 , (1), near junction of Samana and La Miel rivers, near city of La Dorada, Magdalena River , departamento of Caldas , Colombia , T. White and J. N. Reynolds , 27 February 1950 . CAS 13233 , (1), Puerto Berrio, Cienega, Magdalena River , Colombia . C. H. Eigenmann , 1913 . ICN -MHN uncatalogued (1 ds), Magdalena River , Colombia , R. Royero , 2002 .

FIGURE 24. Pseudoplatystoma magdaleniatumn. sp. , holotype, CAS 19165, 421.5 mm SL. Scale 15 cm.

FIGURE 25. Distribution of Pseudoplatystoma magdaleniatum (black circles), type locality indicated by a star; and P. reticulatum ZBK (black squares), type locality indicated by a cross.

Diagnosis: A species of Pseudoplatystoma ZBK distinguished by a combination of the following features: rays on dorsal and ventral lobes of caudal fin with fused branches or not separated as in other species of Pseudoplatystoma ZBK ; wide, straight, dark vertical bars on sides; no loops on nape and associated areas; dorsal and ventral regions of pectoral fin pale with no spots; dorsal fin with few or no spots (sometimes 5 spots); 43 vertebrae; adipose fin with few large spots (6-7 spots); areas surrounding the procurrent rays of dorsal fin without spots; posterior region of the metapterygoid wider than in other species, forming a depression or notch in the dorsal margin of the suspensorium (Fig. 26A).

Description: Maximum recorded length 1000 mm TL. Body elongate and slim. Anterior margin of head rounded. Posterior dorsal region of head rough and with distinctive grooves; supraoccipital process with a crest; median fontanel short, extending from middle length of mesethmoid to connection of frontals to supraoccipital. No rough skin on fontanel. Anterior nostrils short. Body pigmentation dark on dorsal and lateral sides with no clear delimitation between pale and dusky areas. Dark bars extending beyond the lateral line with pale bars. Bars connecting dorsally with those on the opposite side. Region posterior to dorsal fin with some median dark bars. Adipose fin with few and large spots. See Table 9 for a comparison with other species.

Etymology: Named for the Magdalena River, Colombia, to which this species is endemic.

FIGURE 26. A, suspensorium of P. magdaleniatum , ICN -MHN (uncatalogued). B, supsensorium of P. punctifer , ICN - MHN (uncatalogued). Arrow points to the notch in the dorsal margin of the suspensorium in P. magdaleniatum . Photo by R. Royero.

TABLE 7. Descriptive measurements of the body size and shape (in mm), and number of vertebrae for P. magdaleniatum . Number of individuals measured, 7.

Variables Holotype mean+SD range
Standard length 421.6 423.7+77.2 351.8-535.6
Snout -posterior occipital process 161.7 161.2+27.3 135.6-200.5
Snout -posterior margin of the opercle 156.2 157.1+29.3 130.5-200.6
Dorsal fin spine length 53 53+8.3 45.6-65.9
Pectoral fin spine length 63.9 63+8 52.3-73.1
Maxillary barbel length 202.9 193.4+41.6 146.2-250
Anterior chin barbel length 124.5 122.1+21.6 68.7-142
Insertion maxillary barbel -eye 55.1 54.8+7.8 47.1-65.4
Insertion maxillary barbel -joint pectoral spine 123.4 130.5+20.6 103-158.7
Insertion maxillary barbel -joint dorsal spine 171.7 173.5+31.6 145.6-223
Eye -joint pectoral spine 72.4 73.6+16.3 56.7-95.5
Eye -joint dorsal spine 116.5 117.1+21.7 97.4-150.6
Joint pectoral spine -joint dorsal spine 69.5 69+12.3 59.4-87.7
Joint pectoral spine -joint first pelvic ray 86.5 96.3+26.9 75-137.5
Joint pectoral spine -joint last ray of dorsal fin 92.7 92.6+18.7 77-120.9
Joint dorsal spine -joint first pelvic ray 64.6 67.9+11.5 56.5-82.7
Dorsal fin base length 37.3 36.7+ 5.7 30.9-44.8
Joint first pelvic ray -joint last dorsal fin ray 46.3 47.5+7 41.3-55.8
Joint first pelvic ray -anal fin origin 104.6 100.9+15.2 89.3-124.6
Joint first pelvic ray -origin adipose fin 102.7 104.7+18 86-134.4
Last dorsal fin ray -anal fin origin 120.7 117.4+19.3 97.2-143.2

...continued

TABLE 7. (continued)

Variables Neotype mean+SD range
Last dorsal fin ray-adipose fin origin 97.3 99.9+18.4 78.3-123.3
Anal fin origin-adipose fin origin 42.2 43+6.7 36.9-51.2
Anal fin base length 43.1 43.4+7.4 36.4-53.9
Anal fin origin-adipose fin terminus 50.6 51.2±8.9 41.7-63.4
Adipose fin origin-anal fin terminus 56.1 55±9.6 47.4-69.9
Adipose fin length 46.2 41.1+6.9 32.7-50
Anal fin terminus-adipose fin terminus 24.7 26.5±4.7 22.4-34.7
Anal fin terminus-ventral caudal fin origin 22.6 22±3.7 20.4-26.6
Anal fin terminus-dorsal caudal fin origin 33.8 33.7+5.7 29.3-41.5
Adipose fin terminus-ventral caudal fin origin 33.6 36.9+7.1 32.6-47.5
Adipose fin terminus-dorsal caudal fin origin 24.6 27+6 27.2-35.8
Caudal peduncle depth 23.4 24.7+4.2 21.2-30.8
Number of vertebrae 43 43+0 43

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