Meromonakantha, Sieg, 1986

Segadilha, Juliana Lopes, Serejo, Cristiana Silveira & Błażewicz, Magdalena, 2019, New species of Typhlotanaidae (Crustacea, Tanaidacea) from the Brazilian coast genera Hamatipeda, Meromonakantha and Paratyphlotanais, with description of Targaryenella gen. nov., Zootaxa 4661 (2), pp. 309-342 : 325

Key for identification of Meromonakantha species

1. Pereopods 2–3 propodus with ventral spine................................................................. 2

- Pereopods 2–3 propodus with ventral simple seta............................................................ 3

2. Cephalothorax longer than wide (1.2 times L:W); antennule article-2 as long as broad; uropod very long and slender, about twice as long as pleotelson; uropod exopod 2-articled............................................... M. irregularis

- Cephalothorax about as long as broad; antennule article-2 wider than long (0.7 times L:W); uropod 1.5 times as long as pleo- telson; uropod exopod 1-articled........................................................... M. mauri sp. nov.

3. Antenna article-2 with short seta, shorter than half of article-4; antenna article-4 stout, less than five times L:W.......... 4

- Antenna article-2 seta as long as half of article-4; antenna article-4 slender, more than seven times L:W........ M. natatoris

4. Pereopods 2–3 merus and carpus ventrally with simple setae only............................................... 5

- Pereopods 2–3 merus and carpus with ventral spines............................................ M. macrocephala

5. Pereopods 2–3 carpus with two ventral setae; antennule article-3 stout, less than 3.5 times L:W....................... 6

- Pereopods 2–3 carpus with only one ventral seta; antennule article-3 slender, about five times L:W............. M. setosa

6. Body slender, about eight times L:W; antennule article-3 about three times L:W.............................. M. nutae

- Body shorter, 5.5 times L:W; antennule article-3 about twice L:W....................................... M. gilrowei