. Bulletin of the British Museum (Natural History) Geology Supplement. 138 ELOPIFORM FISHES ep1-3 nsp pu. h 3-6 -u1-2 h1-2 Fig. 68. Pterothrissus gissu Hilgendorf. Caudal skeleton in left lateral view. Arrows indicate upper and lower principal caudal fin-rays. Pelvic girdle and fin. The pelvic fin originates mid-way between the snout and the caudal peduncle. The fin is supported by a triangular pelvic bone. A narrow band of cartilage forms a cap along the posterior margin of the pelvic bone. Only the innermost pelvic radial is ossified. There are io pelvic fin-rays, the outermost unbranched an
. Bulletin of the British Museum (Natural History) Geology Supplement. 138 ELOPIFORM FISHES ep1-3 nsp pu. h 3-6 -u1-2 h1-2 Fig. 68. Pterothrissus gissu Hilgendorf. Caudal skeleton in left lateral view. Arrows indicate upper and lower principal caudal fin-rays. Pelvic girdle and fin. The pelvic fin originates mid-way between the snout and the caudal peduncle. The fin is supported by a triangular pelvic bone. A narrow band of cartilage forms a cap along the posterior margin of the pelvic bone. Only the innermost pelvic radial is ossified. There are io pelvic fin-rays, the outermost unbranched and the third apparently the longest. A large pelvic splint is associated with the base of the upper half of the outermost (the first) fin-ray. Vertebral column. Of the 107 vertebrae 35 are caudal. Each centrum is amphi- coelous and pierced for the passage of the constricted notochord. Most centra throughout the column are marginally deeper than long but the first sixteen and the posterior three or four are almost twice as deep as long. The lateral surface of each centrum is marked by several longitudinal ridges. The neural arches are autogenous. Those upon the anterior 45 centra are ex- panded distally and bear narrow neural spines. Throughout the abdominal region the spines are represented by separate lateral halves. Short, stout, autogenous parapophyses are found throughout the abdominal region. Those posteriorly are somewhat longer than those anteriorly. The first complete haemal arch and spine occurs on the seventy-sixth centrum. The pleural ribs are short and slender and partially encircle the abdominal cavity. Epineural intermuscular bones are associated with the first 67 neural arches. Those associated with the first 49 are attached to the base of the neural arch, but thereafter. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly res
Size: 1884px × 1326px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbritishmuseumnaturalhistory, bookcentury1900, bookcoll
