Namibimydas prinsi Hesse

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 : 86-88

Namibimydas prinsi Hesse ,1974

Figs10-12, 15, 16, 43

Namibimydas prinsi :Hesse1974:26.

ZooBank LSID:see Table1.

Diagnosis:The species is distinguished from congeners by the lack of ventral macrosetae on the metathoracic femora,the short abdominal setation in females(Fig.16),and its apparent distribution in coastal habitats in the far south-western Western Cape Province of South Africa(Fig.43).

Redescription:

Male.

Head:Black,in general densely 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 more than half width of central facial gibbosity;facial gibbosity distinct,well-developed and discernible in lateral view;mystax white,covering entire facial gibbosity;frons entirely grey pubescent,vertex entirely grey pubescent,postgena lightly grey pubescent;setation:vertex white,frons white,ocp setae white,pocl macrosetae light brown;ocellar triangle apubescent;proboscis brown,long,projecting well-beyond fronto-clypeal suture,reaching half length of postpedicel;labellum small,as wide as prementum,about quarter length of prementum,unsclerotised laterally;maxillary palpus cylindrical,light brown,as long as pedicel.

Antenna:Brown,scape and pedicel white setose dorsally and ventrally;postpedicel cylindrical in proximal0.4,symmetrically bulbous in distal0.6,≥4.0 × as long as combined length of scape and pedicel;apical ‘seta-like’ sensory element situated apically in cavity on postpedicel.

Thorax:Brown,predominantly grey pubescent;scutum uniformly brown,surface entirely smooth,lightly grey pubescent,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,asetose,apical scutellar setae absent;mesopostnotum,anatergite,and katatergite grey pubescent,mesopostnotum asetose,anatergite long white setose,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 grey pubescent,asetose,metepimeron more-or-less flat,same colour as T1,grey pubescent,long white setose.

Leg:Light brown,setation predominantly white;pro,mes,and met coxa lightly grey pubescent,long white setose;met trochanter setose medially;femur light brown,met femur more-or-less cylindrical only slightly wider than pro and mes femur,in distal half without ventral 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 tarsomere1longer than tarsomere2,but less than combined length of tarsomeres2-3,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 11.2-12.5mm;hyaline throughout,veins light yellow,microtrichia absent;cells r,r,r,m,and cup closed;C terminates at junction with R;R terminates1 4 5 3 1 4in R1;R5terminates in R1;stump vein(R3)at base of R4present,short not reaching R2;R4and R5widest apart medially; r–m distinct,R4+5and M1apart,connected by crossvein;M1curves slightly anteriorly at r–m,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,very large and partly overlapping with scutellum medially;haltere light brown.

Abdomen:Brown;setation comprised of dense long white setose,surface entirely smooth;T1-7brown with narrow yellow posterior margin;T1-7long white setose;

T1apubescent,T2-7grey 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(10-12):Supra-hypandrial sclerite present.

Female.

Head:Pocl macrosetae yellow;labellum about0.2length of prementum.Antenna:≥5.0 × as long as combined length of scape and pedicel.Leg:met femur posteroventrally sparse long white,erect setose and setae arranged in distinct row;met tibia lateroposteriorly sparse long white,erect setose and setae arranged in distinct row;met tarsomere1less than combined length of tarsomeres2-3.Wing:Length 12.3-12.7mm;M1straight at r–m (not curving anteriorly).Abdomen:Setation dense,very short white setose;T1-7brown;T1and antero-lateral corners of T2-3long white setose,remaining T short white setose;S1-7predominantly asetose;bullae on T2black,oval.Genitalia:6-7acanthophorite spines per plate.

Material examined: SOUTH AFRICA: Western Cape: 3♀ 4♂ Paternoster , 32°48'25"S 17°53'01"E, 13.ii.1973, A.Prins (holotype and paratypes, SAMC) .

Type locality and distribution:Paternoster(32°48'25"S 17°53'01"E),South Africa(Fig.43,GBIF resource#14003).Biodiversity hotspot:endemic to Cape Floristic Region.