Metacuterebra

Letana, Socrates, Mengual, Ximo & Pape, Thomas, 2024, A new bot fly species of Cuterebra (Diptera: Oestridae) from Ecuador, Zootaxa 5437 (3), pp. 413-423 : 419-420

Key to the species of the Metacuterebra species group

[modified from Guimar„es & Papavero (1999)]

1 Scutum predominantly yellow or orange setose............................................................. 2

– Scutum predominantly black setose...................................................................... 6

2 Scutellum partially or totally black setose. Abdominal tergite 5 black setose with rare yellow setae laterally...................................................................................................... simulans Austen

– Scutellum entirely yellow setose. Abdominal tergite 5 with golden setae......................................... 3

3 Males: narrow frons, distance of eyes at vertex at most three times the ocellar plate width; terminalia curled ventrally and appearing as a rounded, capsule-like structure.............................................................. 4

– Females: broad frons, distance of eyes at vertex more than three times the ocellar plate width; terminalia not capsule-like, comprised of shortened but otherwise unmodified segments 6–8................................................ 5

4 Only parafrontal callus present......................................................... cayennensis Macquart

– Distinct parafrontal and parafacial callus present........................................ apicalis Guérin-Méneville

5 Head with fine yellow setae at vertex. Anepisternum white setose with two tufts of black setae dorsally and a stripe of black setae near posterior margin............................................................ cayennensis Macquart

– Head with black setae at vertex. Anepisternum white setose with two tufts of black setae dorsally..................................................................................................... apicalis Guérin-Méneville

6 Body black setose; sometimes abdomen dark brown......................................................... 7

– Body not entirely black or dark brown setose............................................................... 8

7 Parafrontal and parafacial callus fused; genal callus large, polished black, occupying almost the entire genal region. Head microtomentum testaceous........................................................... baeri Shannon & Greene

– Parafrontal and parafacial callus distinctly separated; genal callus prominent, circular, black. Head microtomentum whitish to grey.................................................................................. funebris (Austen)

8 Thorax black setose dorsally except for a U-shaped band of yellow or orange setae, composed of the postalar tufts and setae on the scutellar margin................................................................................... 9

– Thorax without a U-shaped band of yellow or orange setae................................................... 11

9 Parafrontal and parafacial callus inconspicuous and represented only by rugose areas. Head mostly black setose except for face with golden setae and gena with tuft of orange setae posteriorly. [Female unknown]................ townsendi (Fonseca)

– Parafrontal and parafacial callus distinct. Head white or yellowish setose, face with yellow setae and gena without a tuft of orange setae posteriorly............................................................................... 10

10 Parafrontal, parafacial and genal callus distinctly small. Abdomen with grey microtomentum, laterally with conspicuous tufts of black setae.................................................................. patagona Guérin-Méneville

– Parafrontal, parafacial and genal callus at least about quarter size of facial plate. Abdomen with orange microtomentum except for a narrow shiny black stripe on posterior margin, laterally covered with black setae not forming circular tufts.................................................................................................... infulata Lutz

11 Scutum black setose, anterior area of prescutum covered with yellow setae, extending posteriorly into a U-shaped fringe, or a few yellow setae are found at the anterior margin of prescutum................................................ 12

– Scutum black setose, anterior margin of prescutum without distinct yellow setae.................................. 13

12 Thorax black setose with yellowish tufts on alar area and whitish setae on scutellar margin. Anepisternum with distinct black setae that appear as spots........................................................ pessoai Guimar „es & Carrera

– Thorax black setose with yellowish and golden setae on anterior half of pronotum. Alar region and thoracic pleuron with yellowish setae; anepisternum black setose, anterior margin with yellowish setae....................... detrudator Clark

13 Scutum cinereous microtomentose. Abdomen black setose except for yellow setae laterally.......................... 14

– Scutum with microtomentum not cinereous. Abdomen yellow setose, sometimes with some black setae............... 15

14 Scape and pedicel with long, whitish setae. Body 18 mm ....................................... megastoma Brauer

– Scape and pedicel with yellowish or black setae. Body 23 mm ......................... almeidai Guimar „es & Carrera

15 Parafrontal, parafacial and genal callus distinct; lower half of face with yellow setae. Pleura yellow setose with two tufts of black setae on anepisternum, a third tuft on postpronotal lobe. Scutellum and abdomen with orange cuticle; scutellum black setose.............................................................................. rufiventris Macquart

– Parafrontal, parafacial and genal callus indistinct or not developed; lower half of face with black setae. Pleura black setose with a single tuft of yellow setae............................................................................ 16

16 Vertex narrow, about as wide as ocellar plate. Long, golden yellow setal tuft posteriorly on anepisternum.Abdominal syntergites 1+2 black setose, tergites 3–5 golden yellow setose; sternites black setose......................... yanayacui sp. nov.

– Vertex relatively wide, more than three times the width of ocellar plate. Long yellow setal tuft ventromedially on katepisternum, between fore- and mid-coxa. Abdominal syntergites 1+2 whitish setose with black setae laterally, tergites 3–5 golden brown setose dorsally, whitish laterally; sternites whitish setose.............................................. ornata Bau