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tadpole madtom
The tadpole madtom (''Noturus gyrinus'') is a species of fish in the Ictaluridae family.〔http://www.itis.gov/servlet/SingleRpt/SingleRpt〕 It is native to Canada and the United States.〔http://fishbase.org/Summary/SpeciesSummary.php?ID=3037&AT=tadpole+madtom〕
== Description ==
An adult tadpole madtom is typically , however they have recorded at a length of .〔http://www.dnr.state.oh.us/Home/species_a_to_z/SpeciesGuideIndex/tadpolemadtom/tabid/21791/Default.aspx〕 The tadpole madtom has a dark brown back with a lighter brown color on their sides and a yellow or white stomach. The pelvic and pectoral fins of adults are heavily covered in melanophores responsible for pigmentation, and the dorsal and anal fins contain fewer melanophores. There are also bands of melanophores on both the upper and lower jaws creating a dark horizontal streak along the side. Chin barbels vary from white to being lightly covered with melanophores. The tadpole madtom possess dark nasal and maxillary barbels and white mandibular barbels. Their adipose fin is completely connected to their large and round caudal fin,〔http://www.epa.gov/bioiweb1/html/fish_catfishes_genus.html〕 and their pectoral fin is not serrated. They possess 6-7 gill rakers; 6-7 dorsal rays; 15-18 anal rays; 7-9 pectoral rays; and 8-10 pelvic rays. The anal fin is of moderate length, but decreases with increasing body length. The tadpole madtoms also possess two pectoral spines through which an anti-predatory venom is transmitted. They have a terminal mouth with numerous small and sharp cardiform teeth. The teeth exist in numerous broad bands across the upper and lower jaw.〔http://www.bio.txstate.edu/~tbonner/txfishes/noturus%20gyrinus.htm〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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