Ammothella Verrill, 1900

Müller, Hans-Georg & Krapp, Franz, 2009, The pycnogonid fauna (Pycnogonida, Arthropoda) of the Tayrona National Park and adjoining areas on the Caribbean coast of Colombia 2319, Zootaxa 2319 (1), pp. 1-138 : 21

Ammothella Verrill, 1900

1. A slender dorsomedian tubercle on all trunk segments .............................................................................. A. exornata Trunk segments without any dorso-median tubercles .................................................................................................. 2

2. Second trunk segment with a pair of short dorso-median club-shaped setae ............................................. A. spinifera Trunk segments in the dorso-median region without setae........................................................................................... 3

3. Crurigers 1–3 with 4, crurigers 4 with 2 lateral spinose tubercles................................................................. A. marcusi Crurigers without lateral spinose tubercles ................................................................................................................... 4

4. Crurigers with a long, very slender tubercle which is twice as long as the diameter of crurigers.... A. gertrudae n.sp. Crurigers without such long slender tubercle ............................................................................................................... 5

5. Trunk very slender, ocular process 7 times and tibia 2 about 20 times as long as their respective diameter, mostly in deep water. ............................................................................................................................................... A. panamensis Trunk rather robust, ocular process 5 times higher than diameter, tibia 2 about 7 times as long as broad, prefers uppermost shallow water .................................................................................................................... A. appendiculata