Thlasia girijae VIRAKTAMATH, WEBB & YESHWANTH, 2025, sp. nov.

Thlasia girijae sp. nov. Figs 13 EF, 19I, 35A–H. Diagnosis. Externally resembling species of Destinia Nast and also has a similar aedeagus with pair of lamellate ventrolateral processes exceeding aedeagal shaft, but differs in having forewing flexed laterad of outer claval vein, pygofer with short processes and the structure of style entirely different. Description. Greenish yellow, crown margin, pronotal lateral margins reddish, clavus mesad of outer claval vein bright yellowish green, rest of forewing dark cinnamon brown. Face, thoracic pleurites, sternites and femora whitish green, tibiae and tarsi brownish. Metabasitarsomere with 5 platellae (Fig. 20F). Male genitalia. Pygofer in lateral view more or less triangular, anterior margin broad, posterodorsal angle acutely rounded, posterior half of pygofer narrowed, thin and prolonged posteriorly, with very short ventral process. Subgenital plate with both extremities narrowed and pointed, about 4.3× as long as wide, about as long as pygofer in lateral view. Style with anterior apodeme 0.4× as long as total length, widest at about midlength then narrowed distally, apophysis abruptly ventrally directed, posterior margin of ventrally directed region slightly concave, apex with sharp posterior angle and rounded anterior angle, apical region sculptured. Aedeagus with short and stout dorsal apodeme; shaft more or less tubular, slightly narrowed in proximal region, then widened being widest at midlength in lateral view, with one pair of ventrolateral, elongate lamellate processes on either side, about as wide as shaft at their midlength, distally narrowed and pointed in dorsal view and exceeding shaft apex slightly; gonopore apical. Female unknown. Measurements. Male 11.4 mm long, 4.0 mm wide across eyes and 4.1 mm wide across posterolateral angles of pronotum. Material examined. HOLOTYPE ♂, INDIA: Tamil Nadu: Kukkal nr Kodai [kanal], 2000m, 25.x.2006, David, K.J. (UASB). Etymology. The species is named after one of the several names of Goddess Parvati, namely Girija, Sanskrit, meaning one who is born to mountain. Remarks. The clavus with bright yellowish green mesad of the outer claval vein contrasted with the dark cinnamon brown rest of the forewing in the male distinguishes this species from the others including species of the externally similar Destinia.

Publication Details

Journal
Zenodo (CERN European Organization for Nuclear Research)
Published
2025-04-23
DOI
https://doi.org/10.5281/zenodo.15324797
Primary Topic
Diatoms and Algae Research
Type
article
Field-Weighted Citation Impact
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article

Thlasia girijae VIRAKTAMATH, WEBB & YESHWANTH, 2025, sp. nov.

Zenodo (CERN European Organization for Nuclear Research)
Diatoms and Algae Research
article

Thlasia girijae VIRAKTAMATH, WEBB & YESHWANTH, 2025, sp. nov.

article en

Abstract

Thlasia girijae sp. nov. Figs 13 EF, 19I, 35A–H. Diagnosis. Externally resembling species of Destinia Nast and also has a similar aedeagus with pair of lamellate ventrolateral processes exceeding aedeagal shaft, but differs in having forewing flexed laterad of outer claval vein, pygofer with short processes and the structure of style entirely different. Description. Greenish yellow, crown margin, pronotal lateral margins reddish, clavus mesad of outer claval vein bright yellowish green, rest of forewing dark cinnamon brown. Face, thoracic pleurites, sternites and femora whitish green, tibiae and tarsi brownish. Metabasitarsomere with 5 platellae (Fig. 20F). Male genitalia. Pygofer in lateral view more or less triangular, anterior margin broad, posterodorsal angle acutely rounded, posterior half of pygofer narrowed, thin and prolonged posteriorly, with very short ventral process. Subgenital plate with both extremities narrowed and pointed, about 4.3× as long as wide, about as long as pygofer in lateral view. Style with anterior apodeme 0.4× as long as total length, widest at about midlength then narrowed distally, apophysis abruptly ventrally directed, posterior margin of ventrally directed region slightly concave, apex with sharp posterior angle and rounded anterior angle, apical region sculptured. Aedeagus with short and stout dorsal apodeme; shaft more or less tubular, slightly narrowed in proximal region, then widened being widest at midlength in lateral view, with one pair of ventrolateral, elongate lamellate processes on either side, about as wide as shaft at their midlength, distally narrowed and pointed in dorsal view and exceeding shaft apex slightly; gonopore apical. Female unknown. Measurements. Male 11.4 mm long, 4.0 mm wide across eyes and 4.1 mm wide across posterolateral angles of pronotum. Material examined. HOLOTYPE ♂, INDIA: Tamil Nadu: Kukkal nr Kodai [kanal], 2000m, 25.x.2006, David, K.J. (UASB). Etymology. The species is named after one of the several names of Goddess Parvati, namely Girija, Sanskrit, meaning one who is born to mountain. Remarks. The clavus with bright yellowish green mesad of the outer claval vein contrasted with the dark cinnamon brown rest of the forewing in the male distinguishes this species from the others including species of the externally similar Destinia.

Zenodo (CERN European Organization for Nuclear Research)
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Diatoms and Algae Research
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