Caddisflies from Myanmar: New records and descriptions of new species (Insecta, Trichoptera) Author Mey, Wolfram Museum für Naturkunde, Leibniz Institute of Evolution and Biodiversity Research, Invalidenstr. 43, 10115 Berlin, Germany Sonnengasse 13, Lunz am See, Austria. tatarin. kyselak @ gmail. com; https: // orcid. org / 0000 - 0003 - 1305 - 8378 Author Malicky, Hans 0000-0003-1305-8378 tatarin.kyselak@gmail.com text Zootaxa 2021 2021-11-02 5060 4 533 565 journal article 3686 10.11646/zootaxa.5060.4.4 2224cc31-78f3-4db3-9a52-2ce9fd357571 1175-5326 5637984 E04FD7B0-17B9-4812-8766-3674FCC3C4B6 Apatania naumanni spec. nov. ( Figs 7A–7F ) LSID urn:lsid:zoobank.org:act: 85121065-4D84-4095-AC81-9D99228700DA Holotype ♂ and paratypes 2 ♂ 1 ♀ (in ethyl alcohol), Myanmar , Kachin State , road Kanphant to Mt. Inwa Bum , near pass, 3008 m , 26°10’31.9”N 98°30’03.4”E , 26.v.2006 , leg. S. Naumann , ( MfN ). Etymology. The species is named in honour of Dr. S. Naumann, the collector of this species. Diagnosis. Although the sclerotized supragenital plate and sclerotized anal tube in the female genitalia are not present, we include this species in the genus Apatania Kolenati 1847 . This placement is justified by corresponding wing venation and absence of apomorphic characters of other genera of Apataniinae. Apatania naumanni spec. nov. is tentatively assigned to the A. complexa Group, which includes most of the ancestral species of the genus. The phallic apparatus is in a primitive state due to its short length and bulbous endotheca with slightly extending lateral flanges without parameres. Long apical spines on the harpagones were listed as a diagnostic character of Protobaicalina Ivanov & Meshutkina (1996) . They are also present in A. naumanni spec. nov. , but as much smaller spines on long harpagones, rendering this character being in an ancestral state. The settlement of Lake Baikal by ancestral species of Apataniinae which led to the subsequent formation and radiation of endemic taxa, is still an unresolved question. A. naumanni spec. nov. might represent a remnant of those species that were able to colonise Lake Baikal in the Tertiary. The species might belong to the group of relict insect taxa that have survived in the transition zone of the Palearctic and Oriental regions. FIGURE 7. Apatania naumanni spec. nov. , scale = 0.5 mm: 7A , male genitalia, left lateral; 7B , male genitalia, dorsal; 7C , male genitalia, ventral; 7D , female genitalia, left lateral; 7E , female genitalia, dorsal; 7F , female genitalia, ventral. Description. Length of each forewing ( ♂ , ♀ ) 6.3–6.5 mm . Head brown, palpi and antennae light brown, ocelli and setal warts grey-white. Thorax brown dorsally and light brown ventrally. Legs light brown, praetarsus without ventral spines, spurs 1.2.4. Forewings brown, each with underside of costa with row of hairs, radius without spines or scales, hind wings with Cu1a and M3 fused for short distance. Male genitalia ( Figs 7A–7C ). Dorsal part of segment IX shortened on anterior margin, ventral part with desclerotized, quadrangular area. Preanal appendages large, lobate. Inferior appendages with short coxopodites; slender hargagones twice as long as coxopodites, each bearing four short spines on apex. External branch of each intermediate appendage triangular in lateral view, with one or two minute processes on posterior margin; internal branch broadly attached to slender, sickle-shaped dorsal lobe of segment IX (sensu Schmid 1955 ). Ventrobasal part of segment X sclerotized, apical part membranous. Phallic apparatus short, phallobase weakly sclerotized, large endotheca with extended flanges, aedeagus membranous, parameres absent. Female genitalia ( Fig 7D–7F ). Median process of segment VIII membranous, slightly sclerotized at tip. Segment IX without anterolateral apophyses; caudal part without sclerotized supragenital plate. Segment X with two lateral, compressed, setose lobes, separated dorsally by median, triangular part; final part of anal tube melanized, attached to ventral side of segment X. Vulvar scale with dorsal process extending over median process.