. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 494 BuUetin Muscidu of Comparative Zoology, Vol. 144, No. 8. pplvic splinl L . 5 mm J Figure 3. Modified scale in caudal gland of $ lotabrycon proecox (drawn from an alizarin preparation). Arrow points to separately ossified process which may represent a second modified scale. depth (range , average ) tends to be greater tlian in fenial(\s and immature specimens (range , average ). In tlic- first eiglit or ninc> segmented anal fin rays bear liooks and form a distinet lobe; pe
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 494 BuUetin Muscidu of Comparative Zoology, Vol. 144, No. 8. pplvic splinl L . 5 mm J Figure 3. Modified scale in caudal gland of $ lotabrycon proecox (drawn from an alizarin preparation). Arrow points to separately ossified process which may represent a second modified scale. depth (range , average ) tends to be greater tlian in fenial(\s and immature specimens (range , average ). In tlic- first eiglit or ninc> segmented anal fin rays bear liooks and form a distinet lobe; pelvie fins relative!) longer and bearing hooks; peKie fin length , (average ). In females anal and pebie fins bookless; peb'ic l(>ngth , average No other e\ident differenees in pro- portional measurements between sexes. Of 12 male specimens in the type series, the six largest individuals range from mm standard length, whereas out of only 8 females and immatinx^s, the largest female, at mm, is considerably larger. Modified caudal structures in males (Figs. 1-3). Twelve of the 20 specimens in the t)pe series are identified as males because tliey bear well-developed hooks on the anal and pebic fins and have a "caudal ; In lotabrycon the caudal modifications consist of a highly modified scale supporting a large caudal pouch and a muscle with extensive attachments to the proximal half of the upper caudal lobe. The modified scales on opposite sides of the caudal fin are mirror images. It is questionable whether the posteriorly di- rected process indicated by an arrow in. 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. : The Museum
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