Namibimydas

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 : 82-83

Genus Namibimydas Hesse,1972

Figs1-21, 43

Namibimydas Hesse,1972:158.Type species: Namibimydas gaerdesi Hesse ,1972by orig.des.

ZooBank LSID:see Table1.

Diagnosis:The genus is distinguished from other Syllegomydinae by its large size with a wing length of 11.2-17.7mm,the generally grey colour caused by pubescence and dense white setation,the cylindrical metathoracic femora(not expanded),and structures of the male terminalia.

Description:

Male.

Abdomen and terminalia(Figs1-12):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 blunt,evenly rounded;subepandrial sclerite without lateral or median protuberances;hypandrium strongly concave,laterally compressed,entirely sclerotised ventrally(forming a single sclerite),entirely fused with gonocoxite,forming a gonocoxite-hypandrial complex,supra-hypandrial sclerite absent in N.gaerdesi (Fig.1)and present in N.prinsi , N.psamminos sp.n.,and N.stuckenbergi sp.n. (Figs4, 7, 10);gonocoxite dorsoventrally flattened(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 absent;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.21):Densely arranged anteriorly directed setae present on T6-8and S6-8;T8with broad anterior rectangular apodeme;T9formed by wide,rectangular sclerite with median protuberance;T9+10entirely fused,T10divided into2heavily sclerotised acanthophorite plates,5-9acanthophorite spines per plate;2spermathecae,all equally large,formed by more-or-less expanded weakly sclerotised ducts;individual spermathecal duct long;S9(furca)formed by1sclerite,ring-like(joined anteriorly and posteriorly),anterior furcal apodeme present,2lateral projections forming divided apodeme,lateral furcal apodeme absent,median furcal bridge absent.