Chimarra (Chimarra) potiguar, Queiroz & Dias & Calor, 2020

Queiroz, Larissa L., Dias, Everton S. & Calor, Adolfo R., 2020, A new species of Chimarra Stephens 1829 (Trichoptera: Philopotamidae) and new caddisfly records from Rio Grande do Norte State, Brazil, Zootaxa 4885 (1), pp. 99-106 : 101-103

Chimarra (Chimarra) potiguar , new species

( Fig. 2 )

Diagnosis. The new species belongs in the C. (Chimarra) bidens Group ( Blahnik 1998) and differs from all its congeners by the following characters, in lateral view: Segment X has its mesal lobe elongate, sub-rectangular; its lateral lobes are long and rounded apically, each with its dorsal margin with a subapical invagination; the apex of each inferior appendage has a pronounced apicodorsal acute projection, and the phallotremal sclerite complex is curved, with small spines dorsally.

The new species resembles Chimarra (Chimarra) bidens Ulmer 1909 , mainly by the general shape in lateral view of ventral process of segment IX, the lateral lobes of segment X, and the median and apical regions of the inferior appendages. However, the new species has its inferior appendages each bearing a pronounced acute apicodorsal projection in lateral view (absent in C. bidens ), and the basal region of each inferior appendage is V-shaped in ventral view (T-shaped in C. bidens ). Additionally, in C. potiguar n. sp., segment X has a mesal lobe that is longer and more acuminate than in C. bidens in dorsal view, sub-rectangular with a truncate apex in lateral view (apex upcurved and bifurcate in C. bidens ), and its lateral lobes are longer with their apices rounded (apices projected dorsad, and rounded ventrally in C. bidens ).

Description. Length of each forewing 4.04–4.40 mm and of each hind wing 2.97–3.26 mm (males, n = 5).

Head, color dark brown (in alcohol), posterior setal warts elongate and narrow; maxillary palps each having 2nd segment with setae, somewhat shorter than 3rd segment. Thorax, color dark brown. Tibial spur formula: 1-4-4. Forewing with forks I, II, III and V present; Sc, R 1, A 1, A 2, A 3 thickened, R 3, R 4, Cu1b slightly thickened; crossveins sc-c, r 1 -r 2, r-m, cu1b-cu2, cu2-a present; stem of Rs vein conspicuously curved before discoidal cell ( Fig. 2A ). Hind wing with forks I, II, III and V present; Sc very thickened, R 1 almost straight; veins Cu1a, A 1, and A 2 thickened; crossvein r-m present ( Fig. 2B ).

Male genitalia. Segment IX, in lateral view, with anteroventral region enlarged, anterobasal margin rounded, posteroventral process projecting, with pointed apex ( Fig. 2C ). Segment X long, in lateral view with sensilla on pair of swollen areas at midlength, divided into pair of lateral lobes with mesal lobe between them; mesal lobe, in lateral view, elongate, sub-rectangular, in dorsal view, acuminate, thorn-like; lateral lobes, in lateral view, enlarged at midlength, each with dorsal margin invaginated subapically, apex rounded, curved slightly dorsad ( Fig. 2C ), in dorsal view, slightly surpassing and thicker than mesal lobe, apices of lateral lobes enlarged and projecting outward ( Fig. 2D ). Preanal appendages, in lateral view, small, setose ( Fig. 2C ). Inferior appendages, in lateral view, each with long, median region enlarged; apex with pronounced apicodorsal acute projection, axe-shaped ( Fig. 2C ); especially broad basally, tapering to acute apex, in ventral view ( Fig. 2G ). Phallic apparatus with phallotheca tubular, elongate, with apicoventral extension; endotheca elongate, with two slender and elongate spines ( Figs 2E, 2F ); phallotremal sclerite complex, conspicuous curved, bearing row of small spines in dorsal region, and apical membranous structure with associated a wishbone-like sclerites ( Fig. 2E ).

Female and immatures. Unknown.

Holotype male: BRAZIL: Rio Grande do Norte, Portalegre, Pinga Stream , UV light pan trap, 06º01’31”S, 37º59’31.4”W, 26.iv.2014, Dias, E. & Duarte, T. (alcohol, MZSP).

Paratypes: Same data as holotype, except Pinga Waterfall , 06º01’27”S, 37º59’31.8”W, 3 males (alcohol, UFBA) ; same data, except 29.iv.2014, Cordeiro, D., Menezes, M. & Nascimento, F., 1 male (alcohol, UFBA) ; same data, except 2 males (alcohol, UFBA) ; same data, except, 06º01’27”S, 37º59’31.8”W, 29.iv.2014, Bravo, F., Carvalho, J.; Cordeiro, D., Menezes, M. & Nascimento, F., 3 males (alcohol, UFBA) ; same data, except 06º01’27”S, 37º59’31.8”W, 29.iv.2014, 5 males (alcohol, UFBA) .

Distribution. Brazil (Rio Grande do Norte state).

Etymology. Potiguar is related to a large indigenous Tupi tribe that inhabited the Atlantic Coast of the Brazilian Northeastern region, where the states of Rio Grande do Norte and Paraíba are today. Potiguar is also the designation given to those who have been born in Rio Grande do Norte State.

Remarks. Chimarra (Chimarra) potiguar n. sp. belongs to the C. (Chimarra) bidens Species Group (sensu Blahnik 1998) according to the following characters: (1) inferior appendages are elongate, narrow, and with their apices sinuously incurved; (2) the sensilla of tergum X are borne on midlateral, protuberant processes; (3) a posteroventral process of segment IX is elongate, protuberant, and narrowing to an acute apex; (4) the phallotremal sclerite complex consists of an elongate rod, a strongly inclined ring, and a subtending apical structure with gradually curved, “wishbone-like” anterior sclerites, and (5) the inferior appendages are rounded basally.

The Chimarra (Chimarra) bidens Species Group is composed of six species with Neotropical distribution as follows: C. (Chimarra) antilliana Flint 1968 ( Dominica, Guadeloupe, Martinique, and St. Lucia), C. (Chimarra) bidens Umer 1909 ( Brazil, Venezuela, and Suriname), C. (Chimarra) caribea ( Grenada, Mustique, Nicaragua, Panama, Suriname, Trinidad, and Venezuela), C. (Chimarra) duckworthi Flint 1967 ( Costa Rica, Ecuador, Guatemala, Honduras, Mexico, Nicaragua, Panama, and Venezuela), C. (Chimarra) haesitationis (Guadalupe) , C. (Chimarra) woldai Blahnik 1998 ( Panama) ( Blahnik 1998). In this way, C. (Chimarra) potiguar n. sp. represents the easternmost record of the C. (Chimarra) bidens Species Group as well as the second record of this species group in Brazil.

Figures

FIGURE 2. Chimarra (Chimarra) potiguar n. sp., male. 2A, right forewing, dorsal; 2B, right hind wing, dorsal; 2C, genitalia, left lateral; 2D, genitalia, dorsal; 2E, phallic apparatus, everted, dorsal; 2F, phallic apparatus, left lateral; 2G, inferior appendages, ventral.Abbreviations: Dc = discoidal cell; Endo = Endotheca; Endo spines = Endothecal spines; Inf ap = Inferior appendage (paired); IX = abdominal segment IX; I, II, III, V = apical forks I, II, III, and V; Lat lobe = Lateral lobes of segment X (paired); Mes lobe = Mesal lobe of the segment X; Pha = Phallotheca; Pha sc cpx = Phallotremal sclerite complex; Pre ap = Preanal appendage (paired); Sen = sensillae; V proc = posteroventral process of segment IX; VIII = abdominal segment VIII.