Plyomydas Wilcox and Papavero, 1971

Castillo, Stephanie & Dikow, Torsten, 2017, Taxonomic revision of Plyomydas Wilcox & Papavero, 1971 with the description of two new species and its transfer to Mydinae (Insecta: Diptera: Mydidae), Revista Brasileira de Entomologia 61 (2), pp. 192-202 : 194

publication ID 10.1016/j.rbe.2017.03.002

publication LSID


persistent identifier

treatment provided by


scientific name

Plyomydas Wilcox and Papavero, 1971


Plyomydas Wilcox and Papavero, 1971 View in CoL

ZooBank 43AF4DE6-F7DE-4F35-801F-BF4248D531BB

Plazi TreatmentBank 43AF4DE6-F7DE-4F35-801F-BF4248D531BB

Plyomydas Wilcox and Papavero, 1971: 106 View in CoL .

Type-species: Plyomydas peruviensis Wilcox and Papavero, 1971 View in CoL , by original designation.

Diagnosis:The genus is distinguished from other Mydinae by the absence of a ventral metathoracic tibial keel ( Figs. 2 View Figs and 20 View Figs ), only slightly enlarged metathoracic femora ( Figs. 2 View Figs and 20 View Figs ), and a partly pubescent scutum (either stripes Fig. 12 View Figs or spots Fig. 19 View Figs ). Messiasia notospila (Wiedemann, 1828) (see Figs. 28–33 View Figs ) is somewhat similar to Plyomydas because it exhibits a weakly developed tibial keel and a grey pubescence pattern on the scutum, but can be separated from Plyomydas based on the more expanded metathoracic femur and male terminalia. The distinct ventro-posterior gonocoxal process is much more developed in Plyomydas than it is in Messiasia and the two other posterior gonocoxal processes (see Fig. 7 View Figs ) are unique to Plyomydas within Mydinae (J. Calhau, pers. comm.). See also Discussion for transfer of Plyomydas to Mydinae : Messiasiini .

Description: F* abdomen and genitalia ( Figs. 10 and 11 View Figs ): densely arranged anteriorly directed setae absent on posterior T and S; T8 with broad anterior rectangular apodeme; T9 simple, rectangular; T9 + 10 entirely fused, T10 formed by single sclerite, acanthophorite spines absent; 3 spermathecae, all equally large, formed by ±expanded weakly sclerotized ducts; individual spermathecal duct short; S9 (furca) formed by 1 sclerite, inverted U-shaped (joined anteriorly, separated posteriorly), anterior furcal apodeme absent, lateral furcal apodeme present, median furcal bridge absent.

M* abdomen and terminalia ( Figs. 7–9 View Figs , 21–26 View Figs ): T1–7 welldeveloped, entirely sclerotized, T8 postero-medially weakly sclerotized, with anterior transverse sclerotized bridge connecting lateral sclerites; T7–8 anteriorly with 2 lateral apodemes; S6 regular, without any special setation postero-medially; S8 simple plate, entire (undivided) ventro-medially, with horn-like antero-lateral processes, not fused to T8 dorso-laterally; epandrium formed by two sclerites, separated medially and only joining anteriorly, distally in dorsal view pointed postero-laterally; subepandrial sclerite without lateral or median protuberances; hypandrium concave, cup-shaped, entirely sclerotized ventrally, entirely fused with gonocoxite, forming a gonocoxite-hypandrial complex, supra-hypandrial sclerite absent; gonocoxite simple, short, hooklike, without median or lateral protuberance, gonocoxal apodeme present, short (at most slightly extending hypopygium anteriorly); 1 functional phallic prong, short and wide, phallic epimere present, distally simple, evenly rounded; lateral ejaculatory process absent; ejaculatory apodeme formed by single dorso-ventrally oriented plate; ventro-median margin of parameral sheath heavily sclerotized (appearing entirely closed); parameral sheath long, sperm sac entirely covered; sperm sac appearing ± heavily sclerotized.












Plyomydas Wilcox and Papavero, 1971

Castillo, Stephanie & Dikow, Torsten 2017


Wilcox and Papavero 1971: 106
GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF