There is evidence of some contact between the parapatric species of Vipera aspis, Italian V. aspis and Vipera atra Meisner, 1820 along a North-South oriented sector, from about 8°45' to 9° 20' Longitude East. V. atra from north-western Italy is characterized by a high number of ventral scales and dorsal bars, and by a distinct morphological pattern of the hemipenes that has elongated lobes, mostly covered by short and small spines, while V. aspis has a relatively lower number of ventral scales and dorsal bars, and hemipenes that show large lobes with the upper part completely covered by a calyculate area. The intermediate specimens appear to be more similar to V.aspis than to V. atra.

Transition-hybridization areas in parapatric species of Vipera aspis group from northern Italy

Augusto Gentilli;Edoardo Razzetti;
2002

Abstract

There is evidence of some contact between the parapatric species of Vipera aspis, Italian V. aspis and Vipera atra Meisner, 1820 along a North-South oriented sector, from about 8°45' to 9° 20' Longitude East. V. atra from north-western Italy is characterized by a high number of ventral scales and dorsal bars, and by a distinct morphological pattern of the hemipenes that has elongated lobes, mostly covered by short and small spines, while V. aspis has a relatively lower number of ventral scales and dorsal bars, and hemipenes that show large lobes with the upper part completely covered by a calyculate area. The intermediate specimens appear to be more similar to V.aspis than to V. atra.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11571/1214105
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