Pseudozeuxo Sieg, 1982

Segadilha, Juliana Lopes & Serejo, Cristiana Silveira, 2020, First records of Pseudozeuxidae and Metapseudinae (Metapseudidae) (Crustacea, Tanaidacea) in Southwestern Atlantic, with descriptions of two new species, Zoosystematics and Evolution 96 (2), pp. 723-745 : 723

Genus Pseudozeuxo Sieg, 1982

Pseudozeuxo Sieg, 1982: 66.

Pseudozeuxo - Sieg 1982: 66, 73, 75. - Sieg 1986: 47, 53. - Larsen and Wilson 2002: 207, 213, 218, Tab. 1 - Larsen 2005: 257 - Błażewicz-Paszkowycz 2007: 9 - Bird and Larsen 2009: 142, 154, Tabs. 1-2, Figs 1 - 2 - Bird 2012: 10-11, 5L, 5N - Kakui and Fujita 2018: 5, 10.

Diagnosis.

Pleon consisting of five pleonites (all reduced) and pleotelson, provided with only one pair of greatly reduced pleopods. Antennule with subterminal aesthetasc. Antenna article-2 with two setae. Maxilliped endites with gustatory cusps on distal margin. Cheliped carpus with three ventral setae. Pereopods 2-3 propodus with two ventral setae. Uropods exopod one or two-articled; endopod two-articled.

Type species.

Pseudozeuxo belizensis Sieg, 1982.

Species included.

Pseudozeuxo belizensis Sieg, 1982; P. fischeri sp. nov.

Remarks.

The family Pseudozeuxidae is characterized by reduced pleon with pleonites narrower than pereonite-6 in dorsal view and pleonites 1-5 combined shorter than pereonite-6 ( Sieg 1982; Bamber and Bird 1997; Kakui and Fujita 2018). There are only three monotypic genera in this family: Charbeitanais Bamber & Bird, 1997; Haimormus Kakui & Fujita, 2018 and Pseudozeuxo . Nevertheless, Haimormus is easily distinguished due to the absence of pleopods while Charbeitanais and Pseudozeuxo present only pleopod-1 ( Sieg 1982; Bamber and Bird 1997; Kakui and Fujita 2018).

Pseudozeuxo differs from Charbeitanais by (1) antennule with subterminal aesthetasc; (2) antenna article-2 with two setae; (3) maxilliped endites with gustatory cusps only on distal margin; (4) cheliped carpus with three ventral setae; (5) pereopods 2-3 propodus with two ventral setae and (6) uropod endopod two-articled ( Sieg 1982; Bamber and Bird 1997).

Figures

Figure 1. Digital image of Apseudomorpha brasiliensis sp. nov. Paratype female and allotype male (MNRJ 29865 and MNRJ 29864). Female, TL 2.4 mm; Male, TL 1.8 mm. Scale bar: 1.0 mm.

Figure 2. Apseudomorpha brasiliensis sp. nov. Holotype, ovigerous female (MNRJ 29863). A Dorsal view; B enlargement of rostrum; C enlargement of pleon and pleotelson. Scale bars: 1.0 mm for A and 0.1 mm for B-C.