Zoological Series Volume 10, No. 15

Zoological Series Volume 10, No. 15

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...less than 110 mm. in length. The young with a dark lateral band. A caudal spot present, or rarely wanting in large specimens. Fins unmarked. This species is represented by many specimens, ranging from 25 to 500 mm. in length. It is very common in all streams in the Rio Chagres Basin, ranging from the lowland waters to the highest mountain streams. It is the most important fresh water food fish of Panama. Its flesh is penetrated by numerous small bones, but it is of good flavor and much prized by the natives. It is much more abundant than its Pacific slope relative, B. striatulus. This species difiers from B. striatulus principally in the dentition. The scales are also a little smaller. The average in a lateral series for the present species in 9 specimens is 74+, while in the preceding species for the same number of specimens the average is 68+. In the present species from 12 to 15 vertical rows of scales cross the back, between the dorsal and adipose, while in the foregoing there are 18 to 21 rows. The color in the present species mI FIELD MUSEUM OF NATURAL HISTORY. is somewhat darker and the blackish bars on sides are usually more distinct. An examination of specimens from Guatemala shows these to represent a distinct species and should be known as Brycon guatemalensis Regan. The teeth are like those of B. striatulus, but the scales are larger (53 or 54 in a lateral series). Habitat: Atlantic slope of Panama. 42. Brycon petrosus Meek & Hildebrand. Brycon petrosus Meek & Hildebrand, Field Mus. Nat. Hist. Pub., Zool. Ser., X, 1913, 184 (Upper Chagres, Panama). Head 3.3 to 4.1; depth 3.15 to 3.9; D. 11, rarely 10; A. 24 to 30; scales in lateral series 53 to 58. Body elongate, compressed, profile straight over eyes, somewhat...show more

Product details

  • Paperback | 64 pages
  • 189 x 246 x 3mm | 132g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236752465
  • 9781236752468