Polypedilum (Polypedilum) parthenogeneticum Donato & Paggi, 2008

Donato, Mariano, Baccaro, Lara & Siri, Augusto, 2019, Male description of the phytotelma-dwelling species Polypedilum parthenogeneticum (Chironomidae: Chironominae), CHIRONOMUS Journal of Chironomidae Research 32 (32), pp. 68-72 : 69

Polypedilum (Polypedilum) parthenogeneticum Donato & Paggi, 2008

( Fig. 1 )

Polypedilum parthenogeneticum Donato and Paggi 2008: 52 .

Polypedilum (Polypedilum) parthenogeneticum , new combination.

Material examined. ARGENTINA: 1 male with pupal exuviae, Corrientes, Riachuelo, 27.5452754 ° S, 58.7159499 ° W, 31.xii.2018, pipette phytotelmata in Eryngium L. ( Apiaceae ), L. Baccaro ( ILPLA).

Male description

Total length 2.03 mm; wing length 1.5 mm. Total length/wing length 1.35. Wing length/length of profemur 1.97.

Head. AR 1.24. Ultimate flagellomere 128 long. Temporal setae 13. Clypeus with 22 setae. Tentorium 117 long; 27 wide. Length of palp segments: 29; 31; 68; 87; 126. Third palpomere with 3 lanceolate sensilla clavata in small pit; longest 19 long.

Thorax. Dorsocentrals 11, with 3 on humeral area; acrostichals 7; prealars 3; antepronotals 1. Scutellum with 8 setae.

Wing ( Fig. 1A ). VR 1.15. Brachiolum with 1 seta. R with 18; R 1 with 9; R 4+5 with 21; remaining veins bare. Squama with 3 setae. Lengths and proportions of legs in Table 1 .

Legs. Scale of fore tibia: 45. Spur of middle tibia: 16 and 56; of hind tibia: 26 and 70. Width at apex of fore tibia 50; of middle tibia 49; of hind tibia 54. Lengths and proportions of legs in Table 1 .

Hypopygium ( Fig. 1B, C ). Tergite IX with 14 medial setae. Phalapodeme length: 76. Transverse sternapodeme length: 49. Superior volsella 74 long, lateral seta lacking, basal portion of superior volsella with microtrichia and 4 inner setae. Inferior volsella slender 120 long, with 11 setae arranged in two rows. Gonocoxite length: 128. Gonostyle length: 159. HR= 0.81. HV= 1.28.

Remarks

The larva and pupa of this specimen fits in the original description, except that the branches of the thoracic horn present fine spinules in its tegument. This feature was corroborated also in the females previously described, and therefore the emendation of the pupal diagnosis of P. parthenogeneticum is established.

Figures

Figure 1. Polypedilum (Polypedilum) parthenogeneticum Donato and Paggi: A, wing; B, hypopygium, dorsal view; C, hypopygium with anal point and tergite IX removed, dorsal aspect to the left, ventral aspect to the right. Scale bar = 100 µm.