Tortopsis canum Goncalves, Da-Silva & Nessimian
Creators: name: Pantoja, Gabriel M.
name: Salles, Frederico F.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Ephemeroptera
Polymitarcyidae
Tortopsis
Tortopsis canum

description: Tortopsis canum Gonçalves, Da-Silva & Nessimian
Tortopsis canum Gonçalves, Da-Silva & Nessimian, 2011: 51; 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.; 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. 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.; 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.
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); 2) outer margin of tusk with row of around 30 stout spines (Fig. 3A–C); 3) occiput with gray anastomosed lines distributed throughout the area (Fig. 2B); 4) wing pads shaded with gray on costal margin and some longitudinal veins (Fig. 2F).
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). Head. Coloration whitish yellow shaded dark gray among ocelli, occiput with gray anastomosed lines, area beneath preocular tuft unpigmented (Fig. 2B), anterolateral spine 1.5 length of scape (Fig. 2E). 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). 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). 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). Pigmentation on meso- and metanotum poorly marked. Wing pads shaded with gray costal margin and some veins (Fig. 2F). Thoracic pleura and sterna whitish, except for gray metasternum (Fig. 2C). Legs yellowish white, with yellowish setae and apex of tarsal claws orange (Figs. 4A–D). Subdistal transversal row of setae on hind femur composed of a single row (Fig. 4E). Inner distal margin of hind tibia with few strong setae (Fig. 4F). 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). Caudal filaments broken and missing.
description: Published as part of Pantoja, Gabriel M. & Salles, Frederico F., 2024, The nymph of Tortopsis canum Gonçalves, Da-Silva & Nessimian (Ephemeroptera: Polymitarcyidae), pp. 289-294 in Zootaxa 5447 (2) on page 290, DOI: 10.11646/zootaxa.5447.2.10, http://zenodo.org/record/11119433