Latineosus sigillatus ( Molineri, 2014 )

Nascimento, Stênio R. S., Cruz, Paulo V., Lima, Lucas R. C., Lima, Cláudia R. T., Hamada, Neusa & Ale-Rocha, Rosaly, 2023, New species and records of Caenidae Newman, 1853 (Insecta: Ephemeroptera) from Rondônia State, Northern Brazil, Zootaxa 5339 (3), pp. 237-255 : 251

Latineosus sigillatus ( Molineri, 2014) ( Figs. 10I–J )

Alloretochus sigillatus Molineri, 2014: 142 ; Angeli et al. 2015: 200; Angeli et al. 2016: 272 (nymph).

Distribution. Bolivia. Ecuador. Brazil: states of Espírito Santo, Rio Grande do Sul. New record: Rondônia State.

Material examined. Two ♁ subimagos (light trap), Brazil, Rondônia State, Rolim de Moura municipality, Waterfall , road 192 south, S11°50’34.8”, W61°42’50.3”, 21.viii.2022, Nascimento, S. R . S., Cruz, P. V ., Lima, C. R . T . cols. ( INPA); 25 ♁ imagos (light trap), Brazil, Rondônia State, Ji-Paraná municipality, Urupá River , S11°02’07.8”, W62°08’41.5”, 23.viii.2022, Nascimento, S. R . S., Cruz, P. V ., Lima, C. R . T . cols. ( INPA); three nymph, Brazil, Rondônia State, Ji-Paraná municipality, Urupá River , S11°02’07.8”, W62°08’41.5”, 25.viii.2016, Cruz, P. V . col. ( INPA).

Comments. Latineosus sigillatus can be characterized by the relatively large size (male body ca. 4 mm, female ca. 5 mm); with characteristic blackish marks on abdominal terga, presence of vestiges of posterolateral projections on abdominal segments IV–VI, male subgenital plate broadly emarginated posteriorly, ratio of forceps length/ subbasal width 8.9 (adapted from Molineri 2014). Variations related to color pattern were observed in specimens from Rondônia. It was observed that the pronotum does not present a medial T-shaped black mark, abdomen without blackish median marks on terga VII–IX, and head without paired sublateral black marks near hind margin.

Figures

FIGURE 10. Male imagos, body dorsal view and genitalia ventral view: A–B, Brasilocaenis elidioi; C–D, B. irmleri; E–F, Caenis chamie; G–H, C. fittkaui; I–J Latineosus sigillatus. (Scale: Figs. 10A, C, E, G, I = 1 mm; Figs. 10B, D, F, H, J = 0.1 mm).