. Bulletin. Science; Natural history; Natural history. RliSI AKCII NOUS SPECIES c;ROUPS OF NORTH AMERICAN CHORUS FROGS (GENUS PSEUDACRIS: FAMILY HYLIDAE) Seven species of chorus frogs are currently included in Hie North American genus Pseudacris: Pseudacris brachyphona, P. brimleyi, P. clarki, I', nigrita, I'. ornata, P. streckeri, and /'. triseriata. These seven species have been divided inlo different inlragcncric groups by different authors. The most recent designa- tion was that of Chantell (Amer. Midi. Nat., 80:381- 391, 1%8), who divided the extant species into two groups: the ornata gro

. Bulletin. Science; Natural history; Natural history. RliSI AKCII NOUS SPECIES c;ROUPS OF NORTH AMERICAN CHORUS FROGS (GENUS PSEUDACRIS: FAMILY HYLIDAE) Seven species of chorus frogs are currently included in Hie North American genus Pseudacris: Pseudacris brachyphona, P. brimleyi, P. clarki, I', nigrita, I'. ornata, P. streckeri, and /'. triseriata. These seven species have been divided inlo different inlragcncric groups by different authors. The most recent designa- tion was that of Chantell (Amer. Midi. Nat., 80:381- 391, 1%8), who divided the extant species into two groups: the ornata gro Stock Photo
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. Bulletin. Science; Natural history; Natural history. RliSI AKCII NOUS SPECIES c;ROUPS OF NORTH AMERICAN CHORUS FROGS (GENUS PSEUDACRIS: FAMILY HYLIDAE) Seven species of chorus frogs are currently included in Hie North American genus Pseudacris: Pseudacris brachyphona, P. brimleyi, P. clarki, I', nigrita, I'. ornata, P. streckeri, and /'. triseriata. These seven species have been divided inlo different inlragcncric groups by different authors. The most recent designa- tion was that of Chantell (Amer. Midi. Nat., 80:381- 391, 1%8), who divided the extant species into two groups: the ornata group containing /'. clarki, P. ornata, and /'. streckeri; and the nigrita group con- taining /'. brachyphona, /'. brimleyi, /'. nigrita, and P. triseriata. Based on the data reported in the present paper, 1 propose that this scheme be changed by transferring I', clarki from the ornata group to the nigrita group. During the course of a detailed study of the com- plete skeletons of the 32 species of tree frogs found in the temperate regions of the northern hemisphere. 1 examined entire and disarticulated skeletons of specimens from the seven species listed above. Each specimen was cleared in 2 percent potassium hydrox- ide, stained with alizarin red S. and dehydrated and stored in glycerine. The following number of speci- mens of each species were studied: P. brachyphona, 7: P. brimleyi, 2; P. clarki, 5: P, nigrita, 4; P. ornata. 7; /'. streckeri, 3; and P. triseriata, 5. The following species groups can be established solely on the basis of osteological data; the ornata group containing P. ornata and P. streckeri; and the nigrita group containing P. brachyphona, P. brimleyi. P. clarki, P. nigrita. and P. triseriata. The ornata group can be diagnosed in the following way (the contrasting character state found in the nig- rita group is given in parentheses): 1) a solid articula- tion is present between the nasal bone and the facial spine of the maxilla (Fig. 1) (no nasal-maxillary a

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