Acostatrichia buborektala Oláh & Johanson 2011

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 : 213-216

Acostatrichia buborektala Oláh & Johanson 2011

Figs. 8 , 16

Acostatrichia buborektala Oláh & Johanson 2011: 155 , figs. 79–82, male; type locality: Peru, San Martin Prov., Rio Huallaga, at Pumarihri Huallaga Lodge, between Juan Guerra and Chazuta, 14 km (rd.) W Chazuta, 6°36.643’S, 76°12.555’W; type depository: NHRS.

Oláh & Flint (2012), reported from Brazil.

Redescription. Length from front of head to tips of folded forewings 2.3 mm (n = 1). General color, in alcohol, light brown. Head unmodified. Ocelli 3. Antenna 20-articulated; scape cylindrical, twice as long as wide, inner margin not produced; pedicel cylindrical; flagellomeres cylindrical, unmodified. Forewing with costal vein simple, unmodified. Abdominal segment VII bearing very long ventromesal process, with slightly capitate apex ( Figs. 8A, 8E ). Segment VIII shorter dorsally than ventrally ( Fig. 8C ); in ventral view, posterior margin of sternum truncate ( Fig. 8A ); with a pair of long ventrolateral processes, each bearing extremely long seta on basal third and slightly enlarged at apex ( Figs. 8A, 8C ); tergum with transverse row of long setae ( Fig. 8B ). Segment IX mostly within segment VIII, ventrally open; without dorsolateral processes ( Figs. 8B, 8C ). Preanal process globose and bearing very long setae ( Fig. 8B ). Inferior appendages paired but fused with each other basally, elongate, narrowing to apex in lateral view ( Fig. 8A ); without apical or basal processes ( Fig. 8A ). Subgenital plate, in ventral view, broad, with truncate apex ( Fig. 8A ); in lateral view, slightly downturned ( Fig. 8C ). Tergum X membranous, triangular in dorsal view ( Fig. 8B ). Phallus tubular basally, bearing midlength complex, with dorsal window and basal loop shorter than basal portion of phallus ( Fig. 8D ); apical portion with slightly sclerotized sclerite and with no internal spines ( Figs. 8D, 8E ).

Material examined. Brazil: Amazonas, AM 010, km. 246, 15–16 Jul 1979, J. Arias leg., Oláh det., 1 male ( NMNH).

Remarks. Oláh & Johanson (2011) described this species based only on the holotype from Peru. Oláh & Flint (2012) recorded this species from northern Brazil, indicating 8 males in NMNH, but only one specimen of A. buborektala Oláh & Johanson, 2011 was located in this collection. This non-type specimen from Brazil agrees with the original description and it was used here to provide illustrations and the description above. Due to the long and capitate ventromesal process on segment VII ( Fig. 8C ), the presence of a pair of ventrolateral processes on segment VIII ( Figs. 8A, 8E ), and the inferior appendages fused with each other, at least basally ( Fig. 8A ), this species is placed in the A. brevipenis Group. However, A. buborektala is very distinctive from the others in this group and in the genus as a whole. Acostatrichia buborektala differs from other species in the A. brevipenis Group by the inferior appendages fused to each other only basally ( Fig. 8A ), instead of completely fused as a plate. In this respect, this species is similar to those in A. cerna Group, but in A. buborektala the inferior appendages lack a rod-like lateral process, typical for the A. cerna Group. Acostatrichia buborektala can be easily distinguished from other Acostatrichia species by the long ventrolateral processes of segment VIII, each one with an extremely long seta arising from basal half of the process ( Figs. 8A, 8C ).

Distribution. Brazil and Peru ( Fig. 16 ).

Figures

FIGURE 8. Acostatrichia buborektala Oláh & Johanson 2011, non-type male from Amazonas, Brazil, genitalia. 8A, ventral; 8B, dorsal; 8C, left lateral; 8D, phallus, dorsal; 8E, phallus, left lateral. Abbreviations: vl. proc. = ventrolateral process of segment VIII (paired); sb. pl. = subgenital plate; inf. app. = inferior appendage (paired). Scale bar = 0.1 mm.

FIGURE 16. Distribution map of the Acostatrichia species in South America, based on material examined here and previously published records. When latitude and longitude were not available, an approximate location was used. Circle, species in the Acostatrichia plaumanni Group; square, species in the Acostatrichia brevipenis Group; triangle, species in the Acostatrichia cerna Group.