Nothomydas aquilonius, Dikow, T., 2012

Dikow, T., 2012, Review of Namibimydas Hesse, 1972 and Nothomydas Hesse, 1969 (Diptera: Mydidae: Syllegomydinae: Halterorchini) with the description of new species, African Invertebrates 53, pp. 79-111 : 95-98

publication ID 10.5733/afin.053.0105


persistent identifier

treatment provided by


scientific name

Nothomydas aquilonius


Nothomydas aquilonius sp.n.

Figs23-25, 35, 36, 43

ZooBank LSID:see Table1.

Etymology:From Greek aquilonius (northern),referring to the distribution of this species representing the northernmost record of Nothomydas to date.

Diagnosis:The species,known only from a single male,is distinguished from congeners by the apubescent scutum(Fig.35),the posteromedially grey pubescent abdominal tergites 2-7(tergites otherwise apubescent),and the proximally grey pubescent scutellum while it is apubescent distally.



Head:Brown,in general grey pubescent;width distinctly greater than thorax,interocular distance on vertex larger than at ventral eye margin,vertex between compound eyes more-or-less horizontally straight,medially only slightly below dorsal eye margin,parafacial area less than half the width of central facial gibbosity;facial gibbosity distinct,well-developed and discernible in lateral view;mystax white,covering facial gibbosity except for narrow median dorso-ventral area;frons medially apubescent,laterally grey pubescent,vertex apubescent,postgena apubescent;setation:vertex white,frons white,ocp setae white,pocl macrosetae absent;ocellar triangle apubescent;proboscis brown,long,projecting well-beyond fronto-clypeal suture and beyond tip of postpedicel;labellum small,as wide as prementum,about quarter length of prementum,unsclerotised laterally;maxillary palpus cylindrical,brown,minute.

Antenna:Brown,scape and pedicel white setose dorsally,asetose ventrally;postpedicel cylindrical in proximal half,symmetrically bulbous in distal half,≥3.0 × as long as combined length of scape and pedicel;apical ‘seta-like’ sensory element situated apically in cavity on postpedicel.

Thorax:Brown,predominantly apubescent;scutum uniformly brown,surface entirely smooth,apubescent,scutal setation comprised of long white setae with distinct rows of long dorsocentral setae and dense lateral scutal setae;dc setae pre- and postsuturally white,acr setae present,lateral scutal setae white,npl setae0,spal setae0,pal setae0;postpronotal lobe brown,grey pubescent;proepisternum,lateral postpronotum,and postpronotal lobe long white setose;scutellum grey pubescent proximally,apubescent distally,asetose,apical scutellar setae absent;mesopostnotum,anatergite,and katatergite lightly grey pubescent,mesopostnotum asetose,anatergite asetose,katatergite long white setose;katatergite more-or-less flat;anterior anepisternum asetose,supero-posterior anepisternum long white setose;posterior anepimeron long white setose,katepimeron long white setose;metanepisternum lightly grey pubescent,asetose,metepimeron more-or-less flat,same colour as T1,lightly grey pubescent,long white setose.

Leg:Brown,setation predominantly white;pro,mes,and met coxa apubescent,long white setose;met trochanter setose medially;femur brown,met femur more-or-less cylindrical only slightly wider than pro and mes femur,in distal half macrosetose,1anteroventral and1posteroventral row of macrosetae,posteroventrally long white,erect setose and setae arranged in distinct row;pro,mes,and met tibia straight,met tibia cylindrical,ventral keel absent,lateroposteriorly long white,erect setose and setae arranged in distinct row;pro and mes tarsomere1as long as tarsomere2,met tarsomere1as long as combined length of tarsomeres2-3;pulvillus well-developed,as long as well-developed claw,and as wide as base of claw;empodium absent.

Wing:Length 7.9mm;hyaline throughout,veins light brown,microtrichia absent;cells r1r4,r,m,and cup closed;C terminates at junction with R;R terminates in R;,5 3 1 4 1R5terminates in R1;stump vein(R3)at base of R4 present,short not reaching R;R3 4 2 4and R5widest apart medially; r–m distinct,R and M apart,connected by crossvein;4+5 1 M 1straight at r–m (not curving anteriorly),M1(or M1+M2)terminates in R1;CuA1and CuA2split proximally to m–cu (cell m3narrow proximally);M3+CuA1do not terminate together in C;A1undulating,cell a1wide,A1and wing margin further apart proximally than distally;alula well-developed;haltere light brown.

Abdomen:Brown;setation comprised of dense white setose,surface entirely smooth;T1-7brown;T1-2long white setose,T3-7shorter white setose;T1apubescent,T2-7posteromedially grey pubescent;S1-7brown;S1asetose,S2-7sparsely white setose; S predominantly apubescent;T2-4parallel-sided and not constricted waist-like;bullae on T2black,transversely elongate,surface entirely smooth,T2surface anterior to bullae smooth.

Terminalia (Figs23-25):Epandrium distally in dorsal view pointed with single tip posteromedially.


Holotype:♂ NAMIBIA: Karas: Rotkop , 26°42'00"S 15°23'00"E, 12-26.xi.1993, E.Marais,pitfall trap(AAM-000873, NMNW) GoogleMaps .

Type locality and distribution: Rotkop (26°42'00"S 15°23'00"E),Namibia(Fig.43,GBIF resource#14003).Biodiversity hotspot:endemic to Succulent Karoo.


Namibia, Windhoek, National Museum of Namibia