Jurochlus lineatus, Lukashevich, Elena D. & Przhiboro, Andrey A., 2012

Lukashevich, Elena D. & Przhiboro, Andrey A., 2012, Pupae of Mesozoic Jurochlus Kalugina, 1985 (Diptera: Chironomidae), with description of four new species, Zootaxa 3478, pp. 434-452 : 441-446

Jurochlus lineatus sp. nov.

( Figs 6 , 7)

Type material. Holotype: PIN 4270/2544 (part and counterpart of male pupal abdominal segments VII–IX). Paratype: PIN 4270/348 (part and counterpart of male pupal abdominal segments VII–IX). SW Mongolia, Gobi- Altai Aymag, Shar Teg (outcrop 443/1), Upper Jurassic.

Etymology. From the Latin lineatus (rectilinear), in reference to the nearly straight outer margin of the anal lobe.

FIGURE 5. Jurochlus trivittatus sp. nov. from Shar Teg, J3: A, B, holotype PIN 4270/2581, pupa of female: A, segments IV–IX, B, segments VIII and IX; C, D, paratype PIN 4270/2540, pupa of male: C, segments V–IX, D, segments VIII–IX.

FIGURE 7. Jurochlus lineatus sp. nov., Shar Teg, J3: A, holotype PIN 4270/2544, pupa of male: segments VIII–IX; B, paratype PIN 4270/348, pupa of male: total view.

FIGURE 8. Jurochlus spp. pupae from the Mesozoic of Mongolia: A, J. limbatus sp. nov., Shar Teg, J3, holotype PIN 4270/ 2584, female: total view (segments VIII–IX); B, C, J. adustus sp. nov., Khutel Khara, J3/K1, holotype PIN 3965/3209, female: B, total view (pigmentation of tergites not shown), C, segments VIII–IX.

Description. Pupa of male. Segment VII slightly widening distally. Each segment with three wide nearly parallel (broadly oval) concavities, a median and two lateral ones, more darkened than surrounding areas. Tergite VII with a well-developed ridge. Lateral margin of segment VII with at least an apical seta. Tergite VIII with posterior margin slightly darkened.

Segment IX. Outer margins of anal lobes not sinuate: nearly straight in the middle part and very slightly concave at extreme apex. Outer margin with serration strong, developed distal to base of second seta and reaching apical one-fifth, consisting of 40–50 elongate-triangular teeth; inner margin serration finer, no more than 20 teeth distinct. Segment with strong apical spurs (outlines much impressed into/projecting over the surface).

Measurements (holotype, paratype). Combined length of abdominal segments VII–IX, 2800, 2950; entire body length (extrapolated), 9500–10500. Abdominal segments VII–VIII: length, 760, 820–840; width, 1880–1950. Abdominal segment IX: length, 1280–1290; width at base, 1600–1620; distance between tips of anal lobe spurs, 685, 600.

Figures

FIGURE 6. SEM images of Jurochlus lineatus sp. nov. (pupae of male): A – C, holotype PIN 4270 / 2544: A, total view (SE), B, segment IX (SE), C, posterior part of segment VIII and segment IX (BSE); D, paratype PIN 4270 / 348: total view (SE).