Atlantodesmus Hoffman, 2000

Bouzan, Rodrigo Salvador, Iniesta, Luiz Felipe Moretti & Brescovit, Antonio Domingos, 2019, Cladistic analysis and description of a new species of the Brazilian genus Atlantodesmus Hoffman, 2000 (Diplopoda: Polydesmida: Chelodesmidae), European Journal of Taxonomy 538, pp. 1-17 : 5-7

Genus Atlantodesmus Hoffman, 2000

Atlantodesmus Hoffman, 2000: 102 . Type species: Leptodesmus eimeri Attems, 1898 , by original designation.

Iemanja Hoffman, 2000: 106 . Type species: I. teresa Hoffman, 2000 , by original designation. Synonymized by Bouzan et al. 2017: 271.

Diagnosis

Modified from Bouzan et al. (2017): males of Atlantodesmus differ from other chelodesmid genera by the combination of the following characters: absence of ventral projections on the sternites (except A. itapurensis and A. teresa , which have a pair of projections on the fourth sternite; Fig. 5C ); presence of folds on the dorsal edge of the prefemoral region of the gonopod ( Fig. 6B ), except A. pickeli ; presence of a cingulum ( Fig. 2 E−F); acropodite branching, forming a long, thin, falciform solenomere, and a large acropodite process with a broadened apical region overreaching the tip of the solenomere ( Fig. 2 C−F).

Distribution

Occurring in the Atlantic rain forest (states of Paraná, Santa Catarina, São Paulo, Minas Gerais, Espírito Santo and Bahia) and in the Cerrado (states of São Paulo, Mato Grosso do Sul and Minas Gerais) areas of Brazil. See map in Bouzan et al. (2017).

Composition

Six species: Atlantodesmus eimeri ( Attems, 1898) , A. itapurensis (Schubart, 1943) , A. pickeli (Schubart, 1946) , A. pintoi (Schubart, 1946) , A. teresa (Hoffman, 2000) and A. sierwaldae sp. nov.

Key to the males of Atlantodesmus

1. Body coloration concolorous to paranota edge ................................................................................ 2 – Coloration at paranota edge lighter ................................................................................................... 3

2. Tubercles present on dorsal surface of metazonites ................................... A. eimeri ( Attems, 1898) – Tubercles absent on dorsal surface of metazonites ................................... A. teresa (Hoffman, 2000)

3. Median stripe on metazonite present ........................................................ A. pintoi (Schubart, 1946) – Median stripe on metazonite absent ................................................................................................. 4

4. Prefemoral process serrated distally ................................................................................................. 5 – Prefemoral process unserrated distally ............................................................ A. sierwaldae sp. nov.

5. Prefemoral process densely serrated distally ........................................... A. pickeli (Schubart, 1946) – Prefemoral process slightly serrated distally .................................... A. itapurensis (Schubart, 1943)

Figures

Fig. 5. A–B. Lateral projection on the seventh sternite. A. Smooth in Atlantodesmus eimeri (Attems, 1898). B. Serrated in A. pintoi (Schubart, 1946). C. Ventral projection on the fourth sternite in A. teresa (Hoffman, 2000). D. Ventral projection on the fifth sternite in Arthrosolaenomeris pantalanensis Schubart, 1943. E–F. Shape of the posterior edge of the paranota. E. Rounded in A. pantalanensis. F. Acuminate in Atlantodesmus eimeri (Attems, 1898). Scale bars: A–B = 250 µm; C–F = 500 µm.

Fig. 6. A. Folds on the gonopod aperture in Atlantodesmus pintoi (Schubart, 1946). B. Folds on dorsal edge of the prefemoral region in A. pintoi. C. Smooth-edged prefemoral process in A. itapurensis (Schubart, 1943). D. Serrated prefemoral process in A. teresa (Hoffman, 2000). Scale bars: A–B = 2 mm; C = 500 µm; D = 200 µm.

Fig. 2. Atlantodesmus sierwaldae sp. nov., holotype, ♂ (IBSP 180). A. Anterior region in dorsal view. B. Posterior region in dorsal view. C–F. Left gonopod. C. Mesal view. D. Ventral view. E. Ectal view. F. Detail of the distal portion in ectal view. Scale bars: A–B = 2 mm; C–D = 250 µm. E–F = 500 µm.