Simulium (Shewellomyia) Peterson, 1975

Molina, Óscar S. & Gil-Azevedo, Leonardo H., 2021, Simulium (Trichodagmia) (Diptera, Simuliidae) phylogeny revisited: the Neotropical and Afrotropical connection, European Journal of Taxonomy 773, pp. 80-119 : 101-103

publication ID	https://doi.org/ 10.5852/ejt.2021.773.1517
publication LSID	lsid:zoobank.org:pub:C69631FE-E71B-4782-8399-1AD84527DA7E
DOI	https://doi.org/10.5281/zenodo.5557600
persistent identifier	https://treatment.plazi.org/id/9D2E87F3-FFA6-804C-FDAE-FE93FDBDFED2
treatment provided by	Felipe
scientific name	Simulium (Shewellomyia) Peterson, 1975
status

Treatment

Simulium (Shewellomyia) Peterson, 1975 View in CoL

Figs 7 View Figs 3–15 , 27 View Figs 16–32 , 43 View Figs 33–49 , 63 View Figs 50–70 , 82–83 View Figs 71–90 , 112, 124–125 View Figs 107–127. 107–113

Hagenomyia Shewell, 1959: 83 View in CoL , figs 1–9 (as subgenus of Simulium View in CoL ) (preoc.). Type species: Simulium pictipes Hagen, 1880 View in CoL . nom. praeoc.

Shewellomyia Peterson, 1975: 111 (as subgenus of Simulium View in CoL ). Type species: Simulium pictipes Hagen, 1880 View in CoL . nom. nov.

Species

Simulium claricentrum Adler, 1990 View in CoL

S. innoxium Comstock & Comstock, 1895 View in CoL

S. pictipes Hagen, 1880 View in CoL

Diagnosis

Female

Scutum black to dark brown; scutal pattern present ( Fig. 7 View Figs 3–15 ). Cibarium unpigmented anteromedially and unarmed. Tarsal claw without subbasal tooth. Hypoginial valves subtriangular, shorter than sternite VIII width, forwardly directed. Anal lobe subrectangular with ventral extension shorter than the cercus base width ( Fig. 27 View Figs 16–32 ).

Male

Ventral plate ( Fig. 43 View Figs 33–49 ) two times longer than wide, deeply notched (reaching about half of the ventral plate body width); lateral shoulders projected; posteromedial process absent. Gonocoxite wider than long, with base double in width than gonostylus width at their point of intersection ( Fig. 63 View Figs 50–70 ). Gonostylus cylindrical, distinctly longer than gonocoxite, with blunt apex and without apical spinule ( Fig. 63 View Figs 50–70 ). Parameres with both distinctly large and small accessory spines.

Pupa

Cocoon aperture upward directed, separated from substratum, not corbicular ( Figs 82–83 View Figs 71–90 ). Gills shorter than pupa body, with trunk development, and totally enclosed by cocoon anterior margin; with nine filaments arranged in different planes (tridimensional); filaments flexible, cylindrical, with blunt apices concolorous with rest of gill; inferior branch multibranched. Thoracic trichomes simples.

Larva (last instar)

Cephalic apotome spots insertion area pigmented ( Figs 124–125 View Figs 107–127. 107–113 ). Postocciput extended over the cervical sclerites. Antenna equal or shorter than labral fan stalk, without secondary annulations. Mandibles with pre-apical teeth shorter than apical tooth; two mandibular serrations of different sizes. Postgenal cleft triangular; postgenal bridge length equal or less than hypostomal length. Hypostomal anterior margin straight; hypostomal teeth extended beyond anterior margin of ventral wall of hypostoma; medial tooth at same level as lateral ones; lateral serrations well-developed, sharp; paralateral teeth absent. Body surface glabrous. Abdomen gradually expanding posteroventrally to last segments, then abruptly contracting to posterior proleg ( Fig. 112 View Figs 107–127. 107–113 ). Anal sclerite no encircling base of posterior proleg. Posterior portion of abdomen without sclerotized accessory plates. Without 1+1 ventral tubercles. Rectal papillae with three multi-branched lobes.

Remarks

Simulium (Shewellomyia) was recovered as monophyletic and stable, based on three synapomorphies ( Fig. 1 View Fig , Table 2 View Table 2 , node 7), therefore we propose its revalidation.

Distribution

Simulium (Shewellomyia) is distributed in the Nearctic Region, recorded from the central-eastern regions of Canada and the USA ( Adler 2020).