Wormaldia caobangensis, Johanson & Pham, 2025

Johanson, Kjell Arne & Pham, Hong-Thai, 2025, Description of three new species of Wormaldia McLachlan, 1865 from Vietnam (Trichoptera: Philopotamidae), European Journal of Taxonomy 1007, pp. 24-34 : 32-33

publication ID	https://doi.org/10.5852/ejt.2025.1007.2991
publication LSID	lsid:zoobank.org:pub:FB5638C1-EE73-44A4-8914-87F0076F8361
DOI	https://doi.org/10.5281/zenodo.16755751
persistent identifier	https://treatment.plazi.org/id/5B7A156C-FFB3-D128-7A5B-FEEA6792FD57
treatment provided by	Plazi
scientific name	Wormaldia caobangensis
status	sp. nov.

Treatment

Wormaldia caobangensis sp. nov.

urn:lsid:zoobank.org:act:412B7D98-4ED4-4DAB-BA79-3F7F50EAED53

Figs 1 View Fig , 4 View Figs 2–4 , 13–16 View Figs 13–16

Diagnosis

The male genitalia of Wormaldia caobangensis sp. nov. exhibit similarities to those of Wormaldia muoihai , particularly in the presence of the downwardly curving harpagones that are of equal height at mid-length and at the base, and are shorter than the coxopodites. However, in lateral view, W. caobangensis is distinguishable from W. muoihai by the more prominently produced anterior segment IX.

Etymology

Wormaldia caobangensis sp. nov. was named after the Vietnamese Cao Bang Province, the type locality of the species.

Type material

Holotype VIETNAM • ♂ (in alcohol); Cao Bang Province, Nui Pia Oac Nature Reserve, N Phia Dén Village, upstream road to the radio tower; 8–10 Apr. 2012; Johanson and Pham leg.; Malaise trap across stream with large stones; loc#VN024; VNMN.

Description (holotype)

Forewing ( Fig. 4 View Figs 2–4 ) 5.5 mm (N = 1), membrane light brown, veins dark brown. Forks 1–5 present; fork 1 originates shortly before distal corner of Dc; basis of M1+2 and Ms hyaline; arc located slightly distally of base of fork 5. Abdominal segments VII and VIII with long posteroventral lobes ( Figs 13, 15 View Figs 13–16 ). In lateral view ( Fig. 13 View Figs 13–16 ), segment IX anteriorly triangular, posteroventral corner not produced posteriorly; coxopodites with slightly undulating ventral margin, dorsal margin strongly convex; harpagones with weakly convex dorsal margin and weakly concave margins, about 3 / 5 as long as coxopodites, each with rounded apex. In dorsal view ( Fig. 14 View Figs 13–16 ), segment IX with wide U-shaped anterior margin; tergum X hidden below triangular tergite VIII. In ventral view ( Fig. 15 View Figs 13–16 ), with sternum IX with small central incision at posterior margin; basal half of coxopodites fused, each with distal half of mesal margin almost straight, bearing scattered setae; harpagones almost straight, without mesal process. Phallus ( Fig. 16 View Figs 13–16 ) with one long, straight sclerite and one distally hook-shaped, slender sclerite, both originating approximately at mid-length of phallus.