Canadopeza biacrosticha, Grimaldi, 2018

Grimaldi, David A., 2018, Basal Cyclorrhapha In Amber From The Cretaceous And Tertiary (Insecta: Diptera), And Their Relationships: Brachycera In Cretaceous Amber Part Ix David A. Grimaldi, Bulletin of the American Museum of Natural History 2018 (423), pp. 1-97 : 1-97

publication ID

https://doi.org/ 10.1206/0003-0090-423.1.1

DOI

https://doi.org/10.5281/zenodo.4631095

persistent identifier

https://treatment.plazi.org/id/03B187A8-FFAC-FFD2-FD75-3B5A7E6CFE37

treatment provided by

Felipe

scientific name

Canadopeza biacrosticha
status

sp. nov.

Canadopeza biacrosticha View in CoL , new species

Figure 29 View FIG

DIAGNOSIS: As for genus, by monotypy.

DESCRIPTION: (Female only). Head: Eyes (partially collapsed in unique specimen) female dichoptic, eyes well separated (face and frons broad), bare, no facet differentiation or emargination of eye edges. Median furrow of frons (presence/absence) not observable; at least 2 pairs short, fine fronto-orbital setae present (fracture obscures observation of anterior portion of frons); no vertical setae; postocular setae very fine, short. Ocelli slightly raised; triangle with 1 pair short, stout, upright setae. Vibrissa, genal setae absent; occiput without large setae, circlet of fine setulae around cervical connection.

Antenna: Scape setulose; pedicel about same length as basal flagellomere, with setulae on apical rim; arista terminal; basal flagellomere small, short and conical; 3 aristomeres, basal 2 minute (basalmost one longer), apical aristomere fine, with micropubescence. Mouthparts: Clypeus narrow; palp of moderate size, protruding beyond oral margin. Labellum well developed, with ~7 pseudotracheae on each lobe.

Thorax: Scutum rounded but not arched. Acrostichals in 2 even rows of ~20 setae; short, decumbent, stiff. One pair of large, prescutellar dorsocentrals present, row of ~15 small, evensized ones anterior to each; 2 rows of short, fine lateral scutal setae on each side. One short postalar seta; no supraalars; 3 short, fine notopleural setae (middle one longest). Prescutellum absent; scutellum side, short, with row of 4 pairs of setae (middle ones largest). Wing: Relatively short and broad, appears entirely hyaline (any infuscation on costal edge unapparent); membrane entirely covered with microtrichia (even on sc cell). One prehumeral costal seta present; C terminates at apex of M 1, C with well-developed spinules. Sc relatively short, apex near level of r-m vein, R 1 short, 0.6× length of wing; Sc and R 1 divergent, not parallel; pterostigma absent. Apex R 2+3 slightly upturned; R 4+5 ends near wing tip; R veins thicker than others; cells rm and bm complete; crossvein dm-cu near middle between fork of M+CuA 1 and wing apex (cell dm short). M 1+2 forked, slightly asymmetrical, M 2 very faint (almost spectral). Vein CuA 2 curved (not straight); cell cup large, longer than terminal vein; anal lobe well developed, alula not observ- able. Legs: Lacking macrosetae, except for stout ventroapical spur on mesotibia. No dark, bifid scales on legs. Basitarsomeres of all legs equal to or slightly longer than combined length of distal tarsomeres; no metatarsomeres flattened or expanded. Puvilli well developed; empodium not observable, probably minute.

Abdomen: Tergites and sternites well developed, apparently without macrosetae. Female Terminalia: Four apical segments telescoping, approximately equal in length; cerci simple, with pair of dark hypoproct lobes protruding at base ventrally.

SPECIMENS EXAMINED: Holotype, female, RTMP 96,9 View Materials .26. Deposited in the Royal Tyrell Museum of Paleontology , Drumheller, Alberta, Canada. The specimen is complete and in good condition, although flows and fractures within the amber prevent observation of some structures.

ETYMOLOGY: In reference to the two rows of acrostichal setae.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Platypezidae

Genus

Canadopeza

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