Nothomydas

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 : 94-95

Nothomydas Hesse,1969

Figs22-42, 43

Nothomydas :Hesse1969:290.Type species: Nothomydas gariepinus Hesse ,1969,by orig.des.ZooBank LSID:see Table1.

Diagnosis:The genus is distinguished from other Syllegomydinae by its small size with a wing length of 5.5-8.9mm,the long proboscis that extends beyond the tip of the postpedicel,the entirely transparent wings,the slender legs,the anteriorly directed setae on abdominal tergites 4-8in females,and structures of the male terminalia.

Description:

Male.

Abdomen and terminalia(Figs23-34):T1-7well-developed,entirely sclerotised,T8posteromedially weakly sclerotised,with anterior transverse sclerotised bridge connecting lateral sclerites;T7-8anteriorly with2lateral apodemes;S6regular,without any special setation posteromedially,S8not plate-like,medially narrow(broad laterally)and protruding ventrally(perpendicular to antero-posterior axis),not fused to T8dorsolaterally;epandrium formed by two sclerites,separated medially and only joining anteriorly,distally in dorsal view pointed with single tip posteromedially( N.aquilonius sp.n., N.gariepinus )or pointed with bid tip posteromedially( N.namaquensis,N.picketti sp.n.);subepandrial sclerite without lateral or median protuberances;hypandrium strongly concave,cup-shaped,entirely sclerotised ventrally(forming a single sclerite),entirely fused with gonocoxite,forming a gonocoxite-hypandrial complex,supra-hypandrial sclerite present;gonocoxite dorsoventrallyflflattened(same height throughout,expanded laterally and medially),without median or lateral protuberance,gonocoxal apodeme absent;2functional aedeagal prongs,extremely long and thin,mediodistally free,parallel or diverging laterally,distally straight or only diverging slightly laterally;aedeagal epimere present,distally simple,evenly rounded;

Figs 21, 22.Female genitalia in dorsal view(anterior on top):(21) Namibimydas gaerdesi (AAM-000866),(22) Nothomydas namaquensis (paratype).Scale lines= 1mm.

lateral ejaculatory process absent;ejaculatory apodeme formed by single dorsoventrally oriented plate;ventro-median margin of dorsal aedeagal sheath heavily sclerotised(appearing entirely closed);dorsal aedeagal sheath long,sperm sac entirely covered;sperm sac appearing more-or-less heavily sclerotised.

Female.

Abdomen and genitalia(Fig.22):Densely arranged anteriorly directed setae present on T3-8and S3-8;T8with broad anterior rectangular apodeme;T9formed by wide,rectangular sclerite with median protuberance;T9+10entirely fused,T10divided into2heavily sclerotised acanthophorite plates,5-6acanthophorite spines per plate;2spermathecae,all equally large,formed by more-or-less expanded weakly sclerotised ducts;individual spermathecal duct long;S9(furca)formed by1sclerite,ringlike(joined anteriorly and posteriorly),anterior furcal apodeme present,2lateral projections forming divided apodeme,lateral furcal apodeme absent,median furcal bridge absent.