Johnson R G, Richardson E S
Science. 1968 Feb 2;159(3814):526-8. doi: 10.1126/science.159.3814.526.
Jeletzkya douglassae Johnson and Richardson is described as the oldest known representative of an extant squid group. The species is known from a single specimen from the Middle Pennsylvanian of Illinois. This very unusual fossil consists of the complete tentacular crown and a fragile shell. The arms bear hooks in double rows.
杰氏鱿（Jeletzkya douglassae Johnson和Richardson）被描述为现存鱿鱼类群已知最古老的代表。该物种仅从伊利诺伊州宾夕法尼亚纪中期的一个标本得知。这个非常特别的化石包括完整的触手冠和一个易碎的壳。腕上有双排钩。
