Parametriocnemus hamatus ( Johannsen, 1934 )

Namayandeh, Armin & Beresford, David V., 2018, A NEW SPECIES IN THE RHEOCRICOTOPUS (R.) EFFUSUS GROUP FROM CANADA WITH A REVIEW OF THE NEARCTIC SPECIES OF RHEOCRICOTOPUS AND PARAMETRIOCNEMUS (CHIRONOMIDAE: ORTHOCLADIINAE) Abstract, CHIRONOMUS Journal of Chironomidae Research 31, pp. 16-29 : 20

publication ID	https://doi.org/ 10.5324/cjcr.v0i31.2531
DOI	https://doi.org/10.5281/zenodo.7995007
persistent identifier	https://treatment.plazi.org/id/03CB87EF-4C57-6970-9193-FD61FC6AFBF1
treatment provided by	Felipe
scientific name	Parametriocnemus hamatus ( Johannsen, 1934 )
status

Treatment

Parametriocnemus hamatus ( Johannsen, 1934)

( Figs 1a–e View Figure 1 )

Material examined. Parametriocnemus (1 ♂), Old Man Joe Mt. (No such location was found in Québec), Québec, 26 April 1968, Collected by D. R. Oliver, No. CH 767

Diagnostic characters. Virga with 2–3 long narrow branches. AnP with inflated basal 1/2 to 2/3 with 4 stout setae on each side. IVo narrow and apically hooked. Gc with large projecting CD.

Male (n=1). Total length = 3.2 mm

Coloration of slide-mounted specimen: Male head and thorax light brown, abdomen golden-brown, halter hyaline to slightly golden, and wing golden-brown.

Head. Antenna ( Fig. 1a View Figure 1 ), with 13 flagellomeres, ultimate flagellomere (L = 606 μm) with apical setae (L = 35 μm); AR = 1.3. Eyes bare, with parallelsided dorsomedial extension ( Fig. 1b View Figure 1 ). Tentorium L = 147 µm ( Fig. 1b View Figure 1 ). Four coronal setae, six orbitals in single row on each side, Clypeus squared (L = 64 µm, W = 68 µm), bearing nine setae. Palpomeres p 1–5, lengths (µm): 36, 42, 141, 143, 207; p 3 with 2 sensilla chaetica.

Thorax. As in Fig. 1c View Figure 1 . Antropronotals 11, uniserial; prealars 6, uniserial. Scutum with six setae in single row.

Wing. Wing with fine punctation and hairs covering most of membrane ( Fig. 1d View Figure 1 ). L = 2.1 mm, W = 0.6 mm. R with 24 setae, R 1 with 15, R 4+5 with 60 setae. Costa extends pass R 4+5. R 4+5 distal to M 3+4. Cu curved.

Legs. Fore legs with two spurs (Ls = 42 µm, 30 µm), mid tibia with two spurs (Ls= 34 µm, 24 µm) and hind tibia with 2 spurs (Ls = 59 µm, 19 µm) and comb with 12–13 stout setae. Pseudospurs are absent. Mid and hind femurs with keel. Pulvilli reduced. Lengths and proportions of legs in Table 1 View Table 1 .

Hypopygium. As in Fig. 1e View Figure 1 . Segment IX bilobed. Virga present with 2–3 long narrow branches. Anal point L = 61 µm. Superior volsella tapered. Inferior volsella narrow and apically hooked-shaped. Gonocoxite longer than wide (L = 203 µm, W = 85 µm) with cluster of long setae medially just below the inferior volsella. Gonostyle more or less rectangular; crista dorsalis large triangular-shaped and strongly projecting above dorsal margin; megaseta L = 13 µm. HR = 3.8, HV = 2.4.

Remarks. The species was first described by Johannsen, 1934 as Metriocnemus hamatus and indicated its close relationship with Meteriocnemus lundbecki Johannsen differing from the latter only in coloration and hypopygium. Sublette (1967) re-described the species as Paraphaenocladius hamatus (Joh.) with illustration of the male hypopygium.