Dicrotendipes Kieffer, 1913

Chamutiová, Tímea, Hamerlík, Ladislav & Bitušík, Peter, 2020, Subfossil chironomids (Diptera, Chironomidae) of lakes in the Tatra Mountains an illustrated guide, Zootaxa 4819 (2), pp. 216-264 : 249

Dicrotendipes Kieffer ( Figs 77–82 )

Head capsule yellow, occipital margin darkened. Frontal apotome separated from clypeus (except for a European species, Dicrotendipes lobiger (Kieffer, 1921)) , and there is an antero-median fenestra (oval to round or linear) on the frontal apotome ( Figs 77, 78 ); anterior margin of frontal apotome may be crenulated ( Fig. 77 ). Antenna 5-segmented, segment 4 exceptionally long. Premandible with 3 teeth, second one and third broad and blunt. Mandible with pale dorsal tooth, 1–2 small surficial and 3 inner teeth. Median tooth of mentum robust, sometimes laterally notched, 6 pairs of lateral teeth. First and second pairs sometimes partially fused. Sixth lateral tooth sometimes reduced into a broad lobe, so only five laterals are clearly visible. Ventromental plates narrow, visibly fan-shaped, completely striated, about half width of mentum; anterior margin smooth or crenate.

Remarks: Mentum of Dicrotendipes is especially similar to that of Glyptotendipes , Einfeldia and Kiefferulus (all having fenestra in frons or frontoclypeus), however ventromental plates of these genera are much longer, (equalling to or exceeding width of mentum), while distinctly short in Dicrotendipes .

Subfossil remains were rare, found in lakes with higher trophy.

Two morphotypes were distinguished following Brooks et al. (2007).

Figures

FIGURES 72–78. Chironomus anthracinus-type: 72—head capsule (arrow indicates two inner teeth of the mandible). C. anthracinus-type: 73—head capsule (arrow indicates three inner teeth of the mandible). Chironomus plumosus-type: 74—head capsule (arrow indicates three inner teeth of the mandible). C. plumosus-type: 75—head capsule (arrow indicates two inner teeth of the mandible). Cladopelma lateralis-type: 76—head capsule. Dicrotendipes nervosus-type: 77—frontal apotome (arrow indicates crenulated anterior margin). Dicrotendipes notatus-type: 78—frontal apotome (arrow indicates antero-median fenestra).

FIGURES 79–84. D. nervosus-type: 79—head capsule. D. nervosus-type: 80—ventromental plate. D. notatus-type: 81—head capsule. D. notatus-type: 82—ventromental plate. Endochironomus impar-type: 83—detail of mentum and ventromental plates. E. impar-type: 84—head capsule (arrow indicates four inner teeth of the mandible).