Xiphocentron (Antillotrichia) maracanan, Vilarino & Cavalcante & Dumas & Nessimian, 2018

Vilarino, Albane, Cavalcante, Bruna Maria Silva, Dumas, Leandro Lourenço & Nessimian, Jorge Luiz, 2018, Four new species of Xiphocentron Brauer, 1870 (Trichoptera: Xiphocentronidae) from the Atlantic Forest, southeastern Brazil, European Journal of Taxonomy 441, pp. 1-16 : 7-8

Xiphocentron (Antillotrichia) maracanan sp. nov.

urn:lsid:zoobank.org:act:757CC480-9BF8-4E4F-8661-271FD6FC38C2

Figs 4–5

Diagnosis

The new species is characterized by a strongly bent inferior appendage (at an angle of about 90° between the base and the apex), with a set of small spines, ranging from the mesal sclerite to near the apex. Moreover, tergum IX has a posterior margin forming a slightly concave central incision with acute sides. The new species has a similar forewing venation as in X. cobacabana sp. nov., with a sessile fork II. The genitalia of the two species are, however, very different.

Etymology

The specific epithet refers to the soccer stadium Estádio Jornalista Mário Filho, located in the city of Rio de Janeiro, and popularly known as Maracanã.

Material examined

Holotype

BRAZIL: ³, Rio de Janeiro State, Rio de Janeiro, Parque Nacional da Tijuca, Rio Taquaruçú (below the waterfall), 22°57′36.2″ S, 43°17′36.2″ W, alt. 509 m, 7 Sep. 2016, B.M. Silva, L.L. Dumas, J.L. Nessimian and F. Quintarelli leg. ( DZRJ 7335 ).

Paratype

BRAZIL: 1 Ƌ, Rio de Janeiro State, Rio de Janeiro, Parque Nacional da Tijuca, Caminho do Moke, Rio do Moke, 22°58′29.8″ S, 43°15′52.7″ W, alt. 355 m, 6 Feb. 2017, A.L. R. Silva, B.M. Silva, J.L. Nessimian, A.S. Nascimento and A.L.H. Oliveira leg. ( MZSP 5412).

Description

Adult

Forewing length 3.7–4.2 mm (n = 2). Overall color (in alcohol) nearly uniformly medium brown. Tibial spur formula 2-4-3. Hind tibia apical spurs not modified ( Fig. 4A). Forewings covered with uniformly fine brown setae, with opaque region on anterior margin between Sc and R1 veins. Wing venation ( Fig. 4B). Forewings: forks II and IV present; Sc reaches costa and then curves meeting R1; fork II sessile starting in discoidal cell; thyridial cell closed; two anal veins present. Hind wings: forks II and V present; Rs with three branches R2+3, R4 and R5; R1 absent. Abdominal sternum V bearing pair of mammiform glandular regions.

Male genitalia ( Fig. 5 A–E)

Tergum IX, in lateral view ( Fig. 5A), ventrally broader, dorsal margin straight, anteroventral margin rounded, dorsal region of posterior margin projected posterad, forming a lobe; in dorsal view ( Fig. 5B), anterior margin with deep V-shaped central incision, posterior margin mesally projected, with slightly concave central incision forming acute edges. Sternum IX, in lateral view ( Fig. 5A), dorsal margin rounded, anterior margin with medial apodeme, ventrally with acute indentation, ventral margin rounded, posterior margin truncate; apodeme apically acuminate; in ventral view ( Fig. 5C), with posterior margin produced, bearing medial V-shaped incision, anterior margin straight, lateral apodemes about half as long as sternum IX, strongly tapered apically. Segment X semi-membranous; in lateral view ( Fig. 5A), elongated, apicodorsally truncated, apicoventrally produced; in dorsal view ( Fig. 5B), wider apically, constricted near mid-length, closed all over its length, medially with sclerotized band, apex split into two lobes; in ventral view ( Fig. 5C), concave apically, ventral region of segment cleft apically.

Preanal appendages elongated, about 1.5 × as long as segment X, setose; in lateral view ( Fig. 5A), basally directed posterodorsally, then bent posterad near mid-length, enlarged and rounded apically; in dorsal view ( Fig. 5B), slightly enlarged basally, slightly tapered apically, apex obtuse. Inferior appendages with articles completely fused; basal region, in lateral view ( Fig. 5A), broad, bent 90° with respect to apical region, posteroventral margin not produced; apical region as long as basal region, slender, in dorsal view ( Fig. 5B), with apex slightly enlarged; inner face with spines ranging from mesal sclerite until apical region; in lateral view ( Fig. 5A), spines in a row on ventral margin of apical region; mesal sclerite small, with basal spine (only clearly visible in ventral view).

Phallus tubular, long and slender, in lateral view ( Fig 5D), apex almost as broad as the base; in dorsal view ( Fig 5E), apex not enlarged, semi-membranous, cleft apically.