Halmyrapseudes Băcescu & Guţu, 1974, Bacescu & Gutu, 1974

Kakui, Keiichi & Angsupanich, Saowapa, 2013, Description of three species of Halmyrapseudes (Crustacea: Tanaidacea: Parapseudidae), with a discussion of biogeography, Zootaxa 3736 (4), pp. 345-367: 347

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Halmyrapseudes Băcescu & Guţu, 1974


Genus Halmyrapseudes Băcescu & Guţu, 1974  

Type species. Halmyrapseudes cubanensis Băcescu & Guţu, 1974   .

Other species currently included in the genus. H. bahamensis Băcescu & Guţu, 1974   ; H. cooperi (Brown, 1954)   ; H. killaiyensis (Balasubrahmanyan, 1962)   ; H. spaansi Băcescu & Guţu, 1975   ; H. thaumastocheles (Monod, 1935)   ; H. gutui   sp. nov. (this study).

Remarks. Halmyrapseudes   differs from all other genera in the Parapseudidae   in having the combination of a transverse row of plumose setae on pleonites 1–5, and the inner flagellum of antennule with two articles (Guţu 2008; Heard & Morales-Núñez 2011; Bamber et al. 2012). The former state is rare in this family, shared only with Pseudohalmyrapseudes Larsen & Hansknecht, 2004   . In the other genera, the transverse row of plumose setae is either present only on pleonite 1, or absent from all pleonites. The chelipeds in Halmyrapseudes   show strong sexual dimorphism: in adult males, the chela dactylus is elongate and far longer than the fixed finger, with the bases of the dactylus and fixed finger well separated, and the carpus has one or more ventral expansions. Three types of ventral expansions can occur on the carpus: Type 1 —one inner semicircular expansion, in H. cooperi   ; Type 2 —one digitiform process, in H. spaansi   ; and Type 3 —one outer digitiform and two inner triangular processes, in the other species. Here we remove from the diagnosis of Halmyrapseudes (Guţu 2008)   the requirement that the male chelipedal carpus bear digitiform or triangular processes, to allow for the type- 1 process. Incidentally, a type- 1 expansion occurs not only in other genera in the Parapseudidae   (e.g., Aponychos   , Pseudohalmyrapseudes   ) but also in the Apseudidae   (e.g., Bunakenia   , Falsapseudes   , Paradoxapseudes   ) (Shiino 1965; Guţu & Iliffe 1989; Guţu 2006; Bamber et al. 2012; Bamber & Błażewicz-Paszkowycz 2013).