Black-knobbed Map Turtle

黑瘤地图龟（Graptemys nigrinoda）是一种分布于美国阿拉巴马州和密西西比州的淡水龟，俗称黑瘤锯齿龟。其背甲具有独特的黑色结节，是地图龟属中体型较小的物种。

Lineage: Turtles and Tortoises (TESTUDINES) > Cryptodira (CRYPTODIRA) > Durocryptodira (DUROCRYPTODIRA) > Testudinoid Turtles Superfamily (TESTUDINOIDEA) > Pond Turtles (EMYDIDAE) > Chicken Turtles and Allies Subfamily (DEIROCHELYINAE) > Map Turtles (Graptemys) > Black-knobbed Map Turtle (Graptemys nigrinoda). This path helps place the taxon within its family, genus, or species-level context.