Latineosus sigillatus (Molineri, 2014) Molineri, 2014

Angeli, Kamila Batista, Salles, Frederico Falcão, Paresque, Roberta, Molineri, Carlos & Lima, Lucas Ramos Costa, 2016, Stage description, new combination and new records of Neotropical Brachycercinae (Ephemeroptera: Caenidae), Zootaxa 4088 (2), pp. 268-278 : 272-274

publication ID

https://doi.org/ 10.11646/zootaxa.4088.2.8

publication LSID

lsid:zoobank.org:pub:2ADF9394-6FEF-4EC9-8369-397FD9F7EDAE

DOI

https://doi.org/10.5281/zenodo.5622777

persistent identifier

https://treatment.plazi.org/id/2B0C87F8-FF9F-FFA5-FF73-FD30FCCDA9C9

treatment provided by

Donat

scientific name

Latineosus sigillatus (Molineri, 2014)
status

comb. nov.

Latineosus sigillatus (Molineri, 2014) , new combination

( Figs. 2–4 View FIGURE 2 View FIGURE 3 View FIGURE 4 )

Alloretochus sigillatus Molineri 2014: 142 , Angeli et al. 2015: 200

Adults and egg. Adequately described by Molineri (2014).

Nymph. Diagnosis. 1) Compound eyes strongly produced dorsally ( Figs. 3A, B, C View FIGURE 3 ); 2) Anterior margin of compound eyes not extending anterior of base of middle ocellar tubercle ( Fig. 3C View FIGURE 3 ); 3) Lateral ocellar tubercle with length subequal to basal width, triangulate in lateral view, apex rounded; 4) Labrum trapezoidal with lateral margin nearly straight; 5) Operculate gill ventrally without submarginal microtrichia; 6) Abdominal segment VI with a pair of projections not overlapping medially ( Fig. 4B, C View FIGURE 4 ); 7) Abdominal segments VII-VIII without projections.

Description. Coloration: General coloration yellowish brown. Head with diffuse dark brown marks on vertex ( Fig. 3A View FIGURE 3 ); antenna pale. Thorax ( Fig. 2B View FIGURE 2 ) with pronotum with dark brown mark in medial region; posterior margin of mesonotum dark brown; metanotum shaded with brown; ventrally pale; legs pale. Abdomen ( Fig. 2B View FIGURE 2 ) dorsally with segments I and II shaded with light brown and with dark brown marks in medial region; segments VII–X with dark brown marks in medial region; ventrally pale; operculate gill with Y-ridge dark brown. Caudal filaments pale with apex shaded with light gray.

Lengths (mm): body, 3.9–4.7; caudal filaments, 1.4–2.2; antenna, 0.9–1.1.

Head: Occiput relatively densely covered with long setae. Compound eye ( Figs. 3A, B, C View FIGURE 3 ) strongly produced dorsally; anterior margin not extending anterior of base of middle ocellar tubercle. Lateral ocellar tubercle ( Fig. 3C View FIGURE 3 , 4A View FIGURE 4 ) length subequal to basal width, triangulate in lateral view, apex rounded. Middle ocellar tubercle ( Fig. 3A, B View FIGURE 3 , 4A View FIGURE 4 ) tapered-conical in dorsal view; length 0.7 × of basal width, and 0.7 × length of lateral ocellar tubercle; apex rounded. Antenna with pedicel 1.0 × length of scape, with 4 or 5 setae on pedicel. Labrum trapezoidal with lateral margin nearly straight. Hypopharynx with superlingua subovate with lateral margin moderately and convexly produced. Maxilla ( Fig. 3D View FIGURE 3 ) with galea-lacinia length 2.3 × basal width; palp segment I width 1.6 × width of segment II; segment II 1.4 × length of segment I, with seven long, stout setae along inner margin.

Thorax: Pronotum with anterior margin moderately emarginate; lateral margin not forming distinctly convex ridge, without angulate expansion. Propleuron partially visible in dorsal view. Legs. Ratios of lengths of body: foreleg: midleg: hindleg—3.6: 1.0: 1.7: 1.8. Ratios of lengths of forefemur: tibia: tarsus: claw—2.1: 1.0: 1.1: 0.7. Ratios of length of hindfemur: tibia: tarsus: claw—1.7: 1.0: 1.0: 0.5. Foreleg. Femur. Dorsally with few long setae and many short setae; ventrally with sparse row of short setae and many long setae on basal third; length of long setae 0.5–1.5 × width of femur. Tibia. Ventral margin with row of about seven setae as long as, or shorter than, width of tibia; posterior surface with some scattered setae measuring 1.2–1.5 × width of tibia, but not arranged in distinct row. Tarsus. Ventral margin with row of about 12 setae as long as, or shorter than, width of tarsus; anterior and posterior surfaces with some setae as long as 1.8 × width of tarsus, not in distinct rows. Hindleg. Femur length 7.0 × width; outer margin with row of short setae and few setae 1.5 × longer than width of femur; inner margin with short setae. Tibia. Outer margin with long, fine setae measuring in length about 2.8 × width of tibia; inner margin with few fine, simple setae. Tarsus. Outer margin bare; inner margin with row of about 6 fine, simple setae. Tarsal claw length 7.4 × basal width.

Abdomen: Terga. Posterolateral projection V length 3.4 × basal width ( Fig. 4B, C, D View FIGURE 4 ); projection VI with distal half with outer margin posterior to inner margin in dorsal view, and with apex rounded, pair of projections not overlapping medially ( Fig. 4B, C View FIGURE 4 ); segments VII–IX without projections. Sterna. Sternum IX with posterior margin truncate. Operculate gill ( Fig. 4B, C, E View FIGURE 4 ). Length 1.2 × width; dorsum with lateral region with some long setae onefifth to one-third length of gill; posteromedial corner with row of long marginal setae measuring up to one-third length of gill; posterolateral corner with marginal setae one-sixth to one-fourth of gill and not longer than posteromedial corner setae; Y-ridge weakly developed, narrow, indistinct; ventral submarginal microtrichia absent.

Material examined. 8 nymphs, BRAZIL, Espírito Santo, São Mateus, Rio Cotaxé, Japira, S 18º34'39.1" / W 40º16'58.0", 18/iv/2013, F.F. Salles, E. Rosário, cols.; 6 male imagos from Pensilvânia light trap, same data as previous, except: 22–23/xi/2012. 18 male imagos from Pennsylvania light trap, BRAZIL, Espírito Santo, Nova Venécia, Rio Cricaré, Santa Rita do Pip Nuck, S 18°39'51.4'' / W 40°30'44.9'', 18–19/iv/2012. 94 male imagos from Pennsylvania light trap, BRAZIL, Espírito Santo, São Mateus, Rio Cotaxé, Sr. Gama farm, S 18°37'41.1" / W 40°6'41.6", 20–21/xi/2013. 35 male imagos, BRAZIL, Rio Grande do Sul, Bossoroca, Barra de Angico, Rio Piratinim, 28.vi.2009, S 28o 32' 26" W 54o 57' 30", AMO Pes col.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Ephemeroptera

Family

Caenidae

Genus

Latineosus

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