Tortopsis canum Gonçalves, Da-Silva & Nessimian

Pantoja, Gabriel M. & Salles, Frederico F., 2024, The nymph of Tortopsis canum Gonçalves, Da-Silva & Nessimian (Ephemeroptera: Polymitarcyidae), Zootaxa 5447 (2), pp. 289-294 : 290

publication ID	https://doi.org/ 10.11646/zootaxa.5447.2.10
DOI	https://doi.org/10.5281/zenodo.11119443
persistent identifier	https://treatment.plazi.org/id/7919E84C-2B7A-FFB0-26C9-FC69FCD6B4FA
treatment provided by	Plazi
scientific name	Tortopsis canum Gonçalves, Da-Silva & Nessimian
status

Treatment

Tortopsis canum Gonçalves, Da-Silva & Nessimian View in CoL

Tortopsis canum Gonçalves, Da-Silva & Nessimian, 2011: 51 View in CoL View Cited Treatment ; Molineri, Salles & Boldrini, 2012: 466.

Examined material: 2 nymphs ( UFVB) from Brazil, Minas Gerais, Pingo-dÁgua, Doce river basin, 19°46’03.3”S, 42°28’35.7”W, drag, 20-IX-2022, Pantoja, G. M., Rippel, M. L. S., & Orlando, T. Y. S., col.; GoogleMaps 2 nymphs ( UFVB) from Brazil, Minas Gerais, Governador Valadares , Mathias Lobato , Suaçuí Grande river , 18°34’23.5”S, 41°56’52.3”W, drag, 11-IV-2023. Pantoja, G. M., Jabeen, F., Orlando , T. Y. S., cols. GoogleMaps 61 adults ( UFVB) from Brazil, Minas Gerais, Pingo-dÁgua, Doce river basin, 19°46’03.3”S, 42°28’35.7”W, light trap, 20-IX-2022, Pantoja, G. M., Rippel, M. L. S., & Orlando, T. Y. S., col.; GoogleMaps and 135 adults ( UFVB) from Brazil, Minas Gerais, Governador Valadares, Mathias Lobato, Suaçuí Grande river , 18°34’23.5”S, 41°56’52.3”W, light trap, 11-IV-2023. Pantoja, G. M., Jabeen, F., Orlando, T. Y. S., cols. GoogleMaps

Diagnosis. The nymphs of T. canum can be distinguished from all other species of the genus by: 1) mandibles with around 10 spines on inner margin of tusk, basal to subdistal tubercle ( Fig. 3C View FIGURE 3 ); 2) outer margin of tusk with row of around 30 stout spines ( Fig. 3A–C View FIGURE 3 ); 3) occiput with gray anastomosed lines distributed throughout the area ( Fig. 2B View FIGURE 2 ); 4) wing pads shaded with gray on costal margin and some longitudinal veins ( Fig. 2F View FIGURE 2 ).

Description. Nearly mature nymph. Length of body (from apex of tusks to apex of abdominal tergum X): 8.3 mm (N=1). General coloration yellowish white with gray markings dorsally ( Fig. 2A View FIGURE 2 ). Head. Coloration whitish yellow shaded dark gray among ocelli, occiput with gray anastomosed lines, area beneath preocular tuft unpigmented ( Fig. 2B View FIGURE 2 ), anterolateral spine 1.5 length of scape ( Fig. 2E View FIGURE 2 ). Antennae and mouthparts whitish yellow, except apex of tusk orangeish, darker towards apex, and spines orange. Finger-like gill present near base of maxillae ( Fig. 3H View FIGURE 3 ). Mandibular tusks with around 10 stout spines on inner margin, basal to subdistal tubercle; outer margin of tusk with row of around 30 stout spines ( Fig. 3C View FIGURE 3 ). Thorax. Pronotum, anterior ring shaded black almost completely including the anterolateral pointed projection, posterior ring with medial gray band and lateral light gray band, both with a median pale line ( Fig. 2A–B View FIGURE 2 ). Pigmentation on meso- and metanotum poorly marked. Wing pads shaded with gray costal margin and some veins ( Fig. 2F View FIGURE 2 ). Thoracic pleura and sterna whitish, except for gray metasternum ( Fig. 2C View FIGURE 2 ). Legs yellowish white, with yellowish setae and apex of tarsal claws orange ( Figs. 4A–D View FIGURE 4 ). Subdistal transversal row of setae on hind femur composed of a single row ( Fig. 4E View FIGURE 4 ). Inner distal margin of hind tibia with few strong setae ( Fig. 4F View FIGURE 4 ). Abdomen. Color pattern as in figures 2A and 2C. Gills: vestigial gills I translucent white; gills II–VII well developed, formed by a pair of large whitish lamellae, the outer (dorsal) lamellae of each pair are shaded with black on a medio longitudinal band, wider on basal portion, thinner towards apex on distal portion ( Fig. 4G View FIGURE 4 ). Caudal filaments broken and missing.