Smicridea (Smicridea) lata Rázuri-Gonzales and Armitage, 2019

Rázuri-Gonzales, Ernesto & Armitage, Brian J., 2019, The Trichoptera of Panama. XI. Three new species of caddisflies in the genus Smicridea McLachlan (Trichoptera: Hydropsychidae) from Omar Torrijos and Santa Fe National Parks, Insecta Mundi 710 (710), pp. 1-13 : 4-5

Smicridea (Smicridea) lata Rázuri-Gonzales and Armitage , sp. n.

Fig. 1 .

Diagnosis. Smicridea (S.) lata is most similar to S. (S.) soyatepecana Bueno-Soria, 1986 from Mexico, mainly based on the shape of tergum X and the phallic apparatus. Both species have a long narrow tergum X in lateral view with a dorsally-directed apex, but in dorsal view, the apex of tergum X in Smicridea (S.) lata is rounded whereas it is truncate in S. (S.) soyatepecana . Additionally, the phallic apparatus in lateral view in both species has a broad posteroventral process. However, this process is broader, directed dorsad, and with a rounded apex in Smicridea (S.) lata but directed posterad and with slightly truncate apex in S. (S.) soyatepecana . Furthermore, the posteroventral process of the phallobase in ventral view in Smicridea (S.) lata is narrowly divided, more slender apically, and with a pair of processes subapically and midlaterally, while in S. (S.) soyatepecana , this process is broadly divided, broader apically, and without subapical processes but with midlateral spines on the surface of the phallobase.

Description. Adult male. Forewing length 4.1 mm (n = 1). Body color light brown (specimen preserved in alcohol). Head and thorax light brown with brown setae, dorsally thorax with dark brown marks anterad. Antennae and legs yellowish brown, legs with short brown setae. Maxillary palps 5-segmented; maxillary palps with fine light brown setae and few thicker dark brown setae dorsally on segments I and II. Forewing membrane brown, with brown setae and whitish transversal band in the nygmal area membrane, mostly denuded. Wing venation typical for the subgenus. Glands on abdominal segments VI and VIII oval.

Male genitalia. Segment IX in lateral view ( Fig. 1A ) much longer dorsally than ventrally, anterolateral margin concave, anterodorsal corner not produced, broadly rounded; anterior portion of dorsal margin slightly concave, posterior portion membranous; ventrolateral margin oblique, sinuous; ventral margin short, rounded; in dorsal view ( Fig. 1B ) anterior margin concave, lateral margin sinuous, inflated mesally, mesally bearing microsetae. Tergum X in lateral view ( Fig. 1A ) narrow, setose, much shorter than segment IX, apex truncate, posterodorsal corner produced dorsad; in dorsal view ( Fig. 1B ) narrow, with rounded apices, separated by mesal notch, less than half its length, membranous mesally. Inferior appendage ( Figs. 1 A–C) two-segmented; first segment extending beyond posterior margin of tergum X, covered with setae, inflated apically; second segment digitate, approximately 1/3 as long as first segment, with short setae on lateral margin and very fine setae on dorsal and mesal surfaces, in dorsal view apex acute, slightly inflated on distal half. Phallic apparatus ( Figs. 1 D–E) with phallobase enlarged, open ventrally; apical section open, dorsolateral corner of phallobase rounded, entire; posterodorsal margin of phallobase mesally produced, spatulate; posteroventral margin produced into broad digitate, entire lobe, with rounded apex, directed dorsad, with pair of midlateral processes: (i) a subtriangular process bearing spicules, and (ii) a short subapical process; in ventral view, posteroventral process deeply notched, notch basally narrow, each lobe slender, rounded apically; endothecal membranes with two pairs of long slender acute spines, curved dorsad: (i) dorsal pair shorter than ventral pair, bearing spicules on dorsal surface, and (ii) ventral spines twice as long as dorsal pair.

Female and immature stages. Unknown.

Distribution. Panama (Veraguas Province).

Etymology. From the Latin word latus, referring to the very broad posteroventral process of the phallobase in lateral view.

Material examined. HOLOTYPE MALE. PANAMA: Veraguas: Santa Fe National Park, Río Mulaba , afluente del primer brazo, 8.51706°N, 81.12140°W, 770 m, 19–23.iv.2017, T. Ríos, E. Álvarez, and C. Nieto, Malaise trap ( COZEM).

Figures

Figure 1. Smicridea (Smicridea) lata Rázuri-Gonzales and Armitage, sp. n., male genitalia. A) Lateral view. B) Dorsal view. C) Left inferior appendage, ventral view. D) Phallic apparatus, lateral view (inset: posterodorsal margin projection, dorsal view). E) Phallic apparatus, ventral view.