. Contributions to North American Ichthyology [microform] : based primarily on the collections of the United States National Museum. Ichthyology; Fishes, Fresh-water; Fishes; Ichtyologie; Poissons d'eau douce; Poissons. GENUS CATOSTOMUS. 153 Tbe jaw-bones are very feeble, the intermaxillary being reduced to a thiu lamella, wblch does not descend to tbe middle of tbe maxillary. The anterior part of tbe mandible is borizoutal, tbin and slightly dilated. The apophyses of the four anterior vertebriB are very strong and ;â (GiJNTHER, Cat. Fishes Brit. Mus. vii, 13.) This genus as at prese
. Contributions to North American Ichthyology [microform] : based primarily on the collections of the United States National Museum. Ichthyology; Fishes, Fresh-water; Fishes; Ichtyologie; Poissons d'eau douce; Poissons. GENUS CATOSTOMUS. 153 Tbe jaw-bones are very feeble, the intermaxillary being reduced to a thiu lamella, wblch does not descend to tbe middle of tbe maxillary. The anterior part of tbe mandible is borizoutal, tbin and slightly dilated. The apophyses of the four anterior vertebriB are very strong and ;â (GiJNTHER, Cat. Fishes Brit. Mus. vii, 13.) This genus as at present restricted comprises three well marked groui)s, which may be accepted as subgenera, under the names Catosto- ms, DccddacfyJus, and Hypcntelium. One of these groui)S, ffypentcUum, lias been usually considered as a distinct genus, on account of the dif- ferences in tbe form of the head and iu the squamatiou. These differ- ences are, however, individually of subordinate value, and should probably be held to designate a subgeneric section, rather than a 4inct genus. The group Becadacttjlus as here given is nearly equivalent to Minomna and Catostomus of Girard, while onr Catostomus is Girard's Acomua. I The type of Catostomus, as restricted by Agassiz, prior to Girard being priniis catostomus Forster, oi:e of the small-scaled group, the name [belongs properly to that group, and Acomits is a simple synonym. iDmctylus llaRuesque was not originally defined in any very tangible way, inasmuch as its author included in it species of Mijxostoma and lUfleptus. As, however, it was intended for 10-rayed species, and as one auiouj;, those originally placed in it was C. teres (as C. hostoniensis), the tlieuaine Decactylus {Dccadactijlns) may be, used instead of Minomus as ladesignation for the subgenus to which C. teres belongs. The genus Catostomus is, next to Myxostoma, the most rich in species. litis much tbe most widely distributed of the genera of Suckers, some of |iis nicmliers abound
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Keywords: ., bookce, bookdecade1870, booksubjectfishes, booksubjectichthyology
