FUIMAN: OSTARIOPHYSI 



129 



Ssur 



Fig. 62. Representative cypriniform larvae. (A-C) Cyprinidae: (A) Tribolodon hakonensis (UMMZ 212151) 9.2 mm TL; (B) Semotilus 

 alromaculatus 8.6 mm TL; (C) Barbiis { = Capoela) tilteya (UMMZ 212148) 6.0 mm TL; (D, E) Cobitidae; (D) Misgurnus fossiHs 6.9 mm TL, 

 after Kryzhanovskii (1949); (E) Acanthophthalmus cf kuhni 4.0 mm TL (specimen from S. S. Boggs). 



lacking oil globules. Eggs may be strongly adhesive (e.g., Cy- 

 priniformes: Nemacheilus [=Barbatula] torn [Kobayasi and 

 Moriyana, 1957]; Characiformes: Gymnocon'mhus tenictzi [pers. 

 obs.]; Siluriformes: Loricana calaphracta [pers. obs.]), nonad- 

 hesive (e.g., Cypriniformes: Clenopharyngodon idclla [Inaba et 

 al., 1957]; Siluriformes: Tandanm landanus [Lake. 1967]), or 

 weakly adhesive (e.g., Cypriniformes: Catoslomus commersoni 

 [pers. obs.]; Characiformes: Scrrasalmm nattercn [pers. obs.]; 

 Siluriformes: Baganus hagarius [David, 1961]). Adhesive fila- 

 ments or other apparent modifications of the egg surface are 

 almost entirely unknown. 



Representatives of outgroups (Gonoi^nchiformes, Clupeo- 

 morpha, "Salmoniformes," and Osteoglossomorpha) share the 

 spherical egg with yellow, granular or segmented yolk. Their 

 eggs are pelagic or demersal, usually 1 .0 to 1.3 mm in diameter. 



adhesive (in Osmerus) or nonadhesive (in Chanos. Alosa. and 

 Hiodon). without oil globules (Chanos) or with one to several 

 (in Alosa and Osmerus). 



Exceptions to this characterization of ostariophysan eggs exist. 

 Among cypriniforms, the cyprinid subfamily Acheilognathinae 

 (Gosline, 1978) exhibits elliptical to pyriform eggs which are 

 deposited in the mantle cavity of a bivalve mollusc (Kryzhan- 

 ovskii et al., 1951; Nakamura, 1969; Makeeva, 1976). Their 

 irregular shape may be the important mechanism preventing 

 the eggs from being expelled. Some cyprinid eggs are pelagic 

 (e.g., Hypophthalmichthys molitrix [Nakamura, 1969; Koblit- 

 skaia, 1981]) and have a larger diameter (ca. 5 to 6 mm) due 

 to the considerable perivitelline space. Only one ostariophysan, 

 the cypriniform Cobitis biwae, was reported to have 12 to 13 

 small oil globules in the yolk (Okada and Seiishi, 1938; Okada, 



Fig. 63. Representative cypriniform larvae (continued). Catostomidae: Hypentetium etowanum (upper) 13.1 mm and (lower) 15.0 mm TL. 



