Stenolis cooperi ( Monné & Monné, 2017 ) Vlasak & Santos-Silva, 2024

Vlasak, Josef & Santos-Silva, Antonio, 2024, Ecuadorian Acanthocinini: description of two new species and transference and notes on Sympagus cooperi Monné & Monné, Zootaxa 5397 (1), pp. 80-90 : 84-86

Stenolis cooperi ( Monné & Monné, 2017) , comb. nov.

( Figs 9–17 )

Sympagus cooperi Monné & Monné, 2017: 254 ; Monné, 2023: 210 (cat.).

Remarks. According to Hovore & Toledo (2006): “ Stenolis Bates, 1864 , superficially resembles Sympagus in the form of the head, antennae and pronotum, but is distinctly more elongate and slender in form. Based upon examination of color transparencies of dorsal and ventral views of the holotype specimen ( Stenolis undulata Bates, 1864 = Stenocorus angulatus Fabricius, 1801 ), and comparisons with several specimens of Stenolis angulata from Brazil and Panama, Stenolis sensu stricto also differs by the more elongate, rectangular front, upper eye lobes separated by about the width of the upper lobe, and much narrower pro- and mesosternal processes, being about one-fourth and one-half the width of an adjacent coxa, respectively. Like Nyssodrysina , Stenolis appears to be polyphyletic as presently assembled.” However, of the differential features pointed out by Hovore & Toledo (2006) separating Sympagus from Stenolis , only the stouter body shape is useful. The distance between upper eye lobes is very variable in both genera, and is practically identical in some species placed in different genera; the width of the prosternal and mesoventral processes is not very different and, as occurs in other genera, for example in Atrypanius Bates, 1864 , it may be very variable; the shape of the frons is another variable feature and, except when the width is distinctly longitudinal, it is not possible to use this feature to separate genera in Acanthocinini.

Monné & Monné (2017) described Sympagus cooperi based on a single female from Ecuador. The allocation in Sympagus was based, probably, on the features reported by Hovore & Toledo (2006). However, this species agrees much better with species currently included in Stenolis and is very similar to S. duidaensis (Gilmour, 1963) . This latter species was transferred to Stenolis by Monné & Monné (2017) when they synonymized Nyssosternus Gilmour, 1963 with Stenolis .

The male ( Figs 9–12, 15 ) is similar to female ( Figs 13, 14, 16, 17 ), differing by the antennae longer, last abdominal tergite centrally emarginate (acute in females), abdominal ventrite 5 shorter than 3–4 together (distinctly longer in females), and femora stouter (slender in females). According to Monné & Monné (2017), the “prosternal process narrowed in middle, width equal to half procoxal cavity width;” and “mesosternal process 2.5 times wider than mesocoxal cavity.” However, the prosternal process is narrower than half procoxal cavity, about one-third, and the mesoventral process (apex) is slightly narrower than procoxal cavity.

Material examined. ECUADOR, Napo: Cosanga , 2100 m, 25.XI.2022, J. Vlasak leg. (1 male and 1 female, MZSP; 1 male and 2 females, JVCO) .

Figures

FIGURES 9–17. Stenolis cooperi (Monné & Monné, 2017). 9–12) Male, specimen 1: 9) Dorsal habitus; 10) Ventral habitus; 11) Lateral habitus; 12) Head, frontal view. 13–14) Female 1: 13) Dorsal habitus; 14) Ventral habitus. 15–17) Dorsal habitus: 15) Male, specimen 2; 16) Female, specimen 2; 17) Female, specimen 3.