Acostatrichia plaumanni Mosely 1939

Santos, Allan Paulo Moreira, 2020, A review of the Neotropical microcaddisfly genus Acostatrichia Mosely, 1939 with description of a new species from Brazil (Trichoptera: Hydroptilidae: Leucotrichiinae), Zootaxa 4755 (2), pp. 201-230 : 208-209

publication ID 10.11646/zootaxa.4755.2.1

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Acostatrichia plaumanni Mosely 1939


Acostatrichia plaumanni Mosely 1939 View in CoL

Figs. 4–5 View FIGURE 4 View FIGURE 5 , 16 View FIGURE 16

Acostatrichia plaumanni Mosely 1939: 228 View in CoL , figs. 173–178, male; type locality: Brazil, Santa Catarina, Nova Teutonia; type depository: BMNH.

Angrisano (1995), reported from Uruguay.

Manzo et al. (2014), reported from Argentina.

Santos et al. (2016), phylogenetic placement.

Redescription. Length from front of head to tips of folded forewings 2.0–3.0 mm (n = 10). General color, in alcohol, light brown. Head unmodified. Ocelli 3 ( Fig. 4A View FIGURE 4 ). Antenna 19-articulated; scape cylindrical, twice as long as wide, inner margin not produced; pedicel cylindrical ( Fig. 4A View FIGURE 4 ); flagellomeres cylindrical, unmodified. Forewings each with costal vein bearing short basal bulla ( Fig. 4B View FIGURE 4 ). Abdominal segment VII bearing two acute ventromesal processes, basal one shorter ( Figs. 5A, 5E View FIGURE 5 ).

Male genitalia. Segment VIII shorter dorsally than ventrally ( Fig. 5E View FIGURE 5 ); in ventral view, posterior margin of sternum truncate, without lateral processes ( Fig. 5A View FIGURE 5 ); tergum with scattered setae. Segment IX mostly within segment VIII, ventrally open; with pair of elongate dorsolateral processes, almost straight in ventral view ( Fig. 5A View FIGURE 5 ); in dorsal ( Fig. 5B View FIGURE 5 ) and lateral views ( Fig. 5C View FIGURE 5 ), each one with very long and stout apical seta. Preanal process digitate, each bearing very long seta ( Fig. 5C View FIGURE 5 ). Inferior appendages paired, short and triangular in ventral view ( Fig. 5A View FIGURE 5 ); without apical or basal processes. Subgenital plate, in ventral view quadrangular ( Fig. 5A View FIGURE 5 ); in lateral view triangular ( Fig. 5C View FIGURE 5 ). Tergum X membranous, posterior margin convex in dorsal view ( Fig. 5B View FIGURE 5 ); in lateral view slightly bilobed ( Fig. 5C View FIGURE 5 ). Phallus tubular basally, bearing midlength complex, with dorsal window and basal loop shorter than basal portion of phallus; apical portion with plate-like sclerite and more than 8 internal spines.

Material examined. Brazil, Sta. Catarina, Nova Teutonia , i.1963, F. Plaumann, Flint det., 10 males ( NMNH); Brasilien, Nova Teutonia, 27°11’B 52°23’L, xi.63, Fritz Plaumann , Flint , 1975 det., 1 male ( NMNH). Uruguay, Artigas, Arroyo de la Invernada, 24.ii.1954, CS Carbonell leg., Flint 1982 det., 13 males ( NMNH); Tacuarembó, Puntas Arroyo Laureles, 10.ii.1954, CS Carbonell leg. Flint det., 16 males ( NMNH).

Remarks. Although the types were not examined, several specimens in the NMNH from the type locality and previously identified by Dr. Flint were studied. In addition, the illustrations and description provided by Mosely (1939) are with sufficient detail to recognize the species correctly. This species is the type species of the genus and in the phylogeny of Leucotrichiinae ( Santos et al. 2016) has been found in a distinct clade, referred to here as the A. plaumanni Group. In this group, Acostatrichia plaumanni , A. simulans , and A. fluminensis share the presence of preanal processes, each one with a very long seta; and the long and digitate dorsolateral processes on segment IX, each one with a stout spine ( Figs. 3C View FIGURE 3 , 5C View FIGURE 5 , 6C View FIGURE 6 ). Acostatrichia plaumanni and A. simulans also share a short basal bulla on the costal vein of each forewing, absent in A. fluminensis . Acostatrichia plaumanni differs from these two and from other species in this group by the dorsolateral processes of segment IX ( Figs. 5A, 5B, 5C View FIGURE 5 ), which are shorter, posteriorly directed, and almost straight (in A. simulans , they are curved inwards in ventral and dorsal views), and by the phallus bearing about 8 apical spines ( Figs. 5D, 5E View FIGURE 5 ).

Distribution. Argentina, Brazil, and Uruguay ( Fig. 16 View FIGURE 16 ).


USA, Washington D.C., National Museum of Natural History, [formerly, United States National Museum]


Smithsonian Institution, National Museum of Natural History


Musee des Dinosaures d'Esperaza (Aude)














Acostatrichia plaumanni Mosely 1939

Santos, Allan Paulo Moreira 2020

Acostatrichia plaumanni

Santos, A. P. M. & Nessimian, J. L. & Takiya, D. M. 2016: 208
Manzo et al. 2014: 208
Angrisano 1995: 208
Mosely, M. E. 1939: 228
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