. Breviora. BREVIORA No. 382 two of the dorsal fin. In larval Pellonula the anal fin origin may be as far forward as posterior third of dorsal fin. All other African freshwater clupeoids have 11 or more pectoral rays. In all other African clupeoids the body is completely scaled in adults; the highest vertebral count previously recorded is 44, with abdominal vertebrae usually more numerous than caudal (Poll, 1964, table 1). Congothrissa has 21+20 vertebrae. The number of epurals is unrecorded for most Pellonulinae; Congothrissa and larval Pellonula have two epurals. Etymology. Thrattidion, Gree
. Breviora. BREVIORA No. 382 two of the dorsal fin. In larval Pellonula the anal fin origin may be as far forward as posterior third of dorsal fin. All other African freshwater clupeoids have 11 or more pectoral rays. In all other African clupeoids the body is completely scaled in adults; the highest vertebral count previously recorded is 44, with abdominal vertebrae usually more numerous than caudal (Poll, 1964, table 1). Congothrissa has 21+20 vertebrae. The number of epurals is unrecorded for most Pellonulinae; Congothrissa and larval Pellonula have two epurals. Etymology. Thrattidion, Greek, neuter diminutive of Thrassa (Thratta), feminine, a small, herringlike fish. Thrattidion noctivagus, new species Figures 1 and 2; Table 1 Holotype. MCZ 48161, mm, Sanaga River at Edea, Cameroon, 4 May 1971. Paratypes. MCZ 48162, 175 specimens, mm (of which 11 specimens mm cleared and stained), Sanaga River at Edea, 17 April and 4 May 1971. The specimens are in excellent condition. They were fixed in formahn immediately after capture and placed in Nalgene plastic bottles containing only small specimens and filled to the brim to prevent damage by shaking. Consequently, the fins are in perfect condition on almost all specimens, and the squamation completely intact. After three months in formalin they were soaked in water for two days, in 40 percent ethyl alcohol for two more days, then transferred to 70 percent ethyl alcohol for permanent preservation. General characteristics. Snout short and rounded. Jaws equal. Body relatively compressed, depth , increasing with Figure 1. Thrattidion noctivagus, paratype. MCZ 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 resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoolo
Size: 2865px × 872px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniversitymuseumofcomparative, bookcentury1900
