Subfossil chironomids (Diptera, Chironomidae) of lakes in the Tatra Mountains an illustrated guide Author Chamutiová, Tímea 0000-0002-8439-4582 peter. bitusik @ umb. sk; https: // orcid. org / 0000 - 0002 - 8439 - 4582 peter.bitusik@umb.sk Author Hamerlík, Ladislav 0000-0002-0803-8981 ladislav. hamerlik @ umb. sk; https: // orcid. org / 0000 - 0002 - 0803 - 8981 ladislav.hamerlik@umb.sk Author Bitušík, Peter 0000-0003-4375-7727 timea. chamutiova @ umb. sk; https: // orcid. org / 0000 - 0003 - 4375 - 7727 timea.chamutiova@umb.sk text Zootaxa 2020 2020-07-23 4819 2 216 264 journal article 8924 10.11646/zootaxa.4819.2.2 8e35f5ad-f97e-432a-9005-3da1fd0bb897 1175-5326 4396828 2459A542-6CF2-4545-9E6F-262C68838D99 Heterotrissocladius Spärck ( Figs 48–50 ) Head capsule yellow, occipital margin pale or darkened. Antenna 7-segmented, seventh segment vestigial ( Fig. 48 ). Premandible with two indistinct teeth ( Fig. 49 ). Apical mandibular tooth shorter than combined width of 3–4 inner teeth. Mentum with two (rarely one) median teeth (sometimes accessory teeth are present) and 5 pairs of lateral teeth. First and second lateral teeth clearly longer than other three lateral teeth. Ventromental plates distinct, bulbous, extended beyond margin of mentum. Remarks: Heterotrissocladius is similar to Paratrissocladius , however the latter has 4 lateral mental teeth. Subfossil remains without antennae and labro-epipharyngeal region could be confused with Psectrocladius and Chaetocladius that have distinct ventromental plates. However, the outmost lateral tooth is usually reduced in Chaetocladius , and ventromental plates of obviously triangular shape with weak beard in Psectrocladius . One morphotype was distinguished. Heterotrissocladius marcidus - type ( Fig. 50 ) Mentum with two median teeth. Submentum entirely pigmented, darker than the rest of the head capsule. Remarks: Heterotrissocladius marcidus (Walker, 1856) is the only known species in the Tatra Mts. lakes, and it is considered to be the most common chironomid inhabiting the Tatra Mts. lakes ( Bitušík et al . 2006a ). Subfossil remains were abundant in most of the studied lakes.