Ecnomus stungtrengensis Laudee & Malicky, 2022

Laudee, Pongsak, Malicky, Hans, Seetapan, Kriengkrai, Thamsaenanupap, Penkhae, Karnkasem, Supawit, Vongsombath, Chanda, Oo, Sai Sein Lin, Kong, Chamroeun, Zalyan, Pome & Morse, John C., 2022, Distribution of Ecnomus McLachlan, 1864 (Trichoptera, Ecnomidae) from the Lower Mekong River with a description of Ecnomus stungtrengensis new species, Biodiversity Data Journal 10, pp. 94936-94936 : 94936

Ecnomus stungtrengensis Laudee & Malicky sp. n.

Ecnomus stungtrengensis Ecnomus McLachlan, 1864

Ecnomus stungtrengensis Type species: Ecnomus tenellus (Rambur, 1842) (monobasic)

Materials

Type status: Holotype. Occurrence: sex: male; lifeStage: Adult; occurrenceStatus: present; preparations: whole animal; occurrenceID: 867C6D9C-CF80-52DF-A6A2-C0B38E0A1A4C; Taxon : scientificName: Ecnomus stungtrengensis; nameAccordingTo: Province ; kingdom: Animalia ; phylum: Arthropoda ; class: Insecta ; order: Trichoptera ; family: Ecnomidae ; genus: Ecnomus ; specificEpithet: stungtrengensis; scientificNameAuthorship: Laudee and Malicky ; Location : continent: Asia ; country: Cambodia; countryCode: KH; stateProvince: Krung Stung Treng; county: Cambodia; municipality: Krung Stung Treng; locality: Tonle Sekong River , 13°32 '00" N, 105°59 '56" E ; minimumElevationInMeters: 42; Identification: identifiedBy: Laudee and Malicky; Event: samplingProtocol: UV light trap; samplingEffort: 1 trap-night; year: 2019; month: 4; day: 8; Record Level: type: Trichoptera; language: English; institutionCode: PSUNHM; basisOfRecord: PreservedSpecimen Type status: Paratype. Occurrence: sex: male; lifeStage: Adult; occurrenceStatus: present; preparations: whole animal; occurrenceID: FCDEB7C7-94E0-50B2-BC0A-8E6B9AB20351; Taxon : scientificName: Ecnomus stungtrengensis; nameAccordingTo: Province ; kingdom: Animalia ; phylum: Arthropoda ; class: Insecta ; order: Trichoptera ; family: Ecnomidae ; genus: Ecnomus ; specificEpithet: stungtrengensis; scientificNameAuthorship: Laudee and Malicky ; Location : continent: Asia ; country: Cambodia; countryCode: KH; stateProvince: Krung Stung Treng; county: Cambodia; municipality: Krung Stung Treng; locality: Tonle Sekong River , 13°32 '00" N, 105°59 '56" E ; minimumElevationInMeters: 42; Identification : identifiedBy: Laudee and Malicky ; Event : samplingProtocol: UV light trap; samplingEffort: 1 trap-night; year: 2019; month: 4; day: 8; Record Level : type: Trichoptera ; language: English ; institutionCode: 2 males (PSUNHM), 2 males (CHM), 2 males (CUAC); basisOfRecord: PreservedSpecimen

Description

Adult habitus: Specimens in alcohol with head, thorax, forewings, abdomen and legs light brown.

Male (Fig. 3 ) Length of each male forewing 4.0 mm (3.5-4.5, n = 5); Tergum IX somewhat rounded, anterior margin bilobed, posterior margin slightly incised in dorsal view (Fig. 3 A); trapezoidal, nearly triangular and truncate anteriorly in lateral view (Fig. 3 B). Sternum IX ovoid in lateral view (Fig. 3B); isosceles trapezoid in ventral view and evenly concave posteriorly (Fig. 3 C); Superior appendages long, slender, strongly and evenly curved inwards posteriorly with numerous long setae, spiny setae subapically in dorsal view (Fig. 3 A); in lateral view, superior appendages, long, slender, tapered and bent downwards with numerous spiny setae apically (Fig. 3 B). Process of segment X triangular with strong apical setae in lateral view. Inferior appendages cylindrical with numerous small setae, bent slightly inwards and upwards subapically, rounded apically in lateral view (Fig. 3 B); in ventral view, crescent-shaped, expanded basally with inner submedial lobe, rounded apicolaterally, acute apicomesally (Fig. 3 C). Paramere spoon-like, bent downwards subapically, rounded apically. Phallus shaped like candle flame, pointed apically in lateral view (Fig. 3 B); in ventral view, conical with pointed apex (Fig. 3 C).

Diagnosis

The male genitalia of E. stungtrengensis sp. n. are similar to those of E. robustior Ulmer, 1951, E. pseudotenellus Ulmer, 1930 and E. projectus Li & Morse, 1997, but clearly different from those species by the shape of the superior appendages. In the new species, they are slender and bent downwards distally in lateral view, but in the other three species, they are straight and not bent in lateral view. In dorsal view, the superior appendages of the new species are bent evenly mesad to define 3/4 of a circle, but in the other three species, they are straight.

Etymology

The species is named for the type locality, Krung Stung Treng Province, with the epithet having masculine gender, corresponding with the gender of the genus.

Distribution

Cambodia (Krung Stung Treng Province).

Figures

Figure 3. Ecnomus stungtrengensis, sp. n. Male genitalia. A tergum IX and superior appendages, dorsal; B tergum IX, sternum IX, superior appendages and inferior appendages, left lateral; C sternum IX and inferior appendages, ventral. Ter IX = tergum IX, Ste IX = sternum IX, Sup = superior appendage (paired), Inf = inferior appendage (paired), Pro X = process of segment X, Par = paramere (paired), Pha = phallus.