Chironomini

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 : 247

Chironomini ( Fig. 6 )

Antennae not placed on distinct pedestals, Lauterborn organs not situated on pedicels. Seta submenti situated ventrally, on the opposite side of mandible from seta interna. Ventromental plates variable in shape but with very few exceptions well-developed and striated (reduced only in the Stenochironomus complex). A useful character to separate the genera within Chironomini is the structure of sclerites on dorsal surface of head: frons (frontal apotome), clypeus and labrum. Frons is either discrete or fused with clypeus and forms frontoclypeus (rarely, all dorsal sclerites fused to form frontoclypeolabrum – Stenochironomus ). In some genera there is a distinct fenestra ( Fig. 78 ) at anterior frons or frontoclypeus, sometimes reduced to smaller mark, line or area with different cuticle. Anterior margin of frons or fronclypeus can be straight, curved, expanded laterally, sometimes crenulated, or with tubercles on surface.

Figures

FIGURES 1–8. Diamesinae, Pseudodiamesa nivosa: 1—head capsule. Prodiamesinae, Prodiamesa olivacea: 2—head capsule. Tanypodinae, Procladius: 3—detail of head capsule. Tanypodinae, Zavrelimyia: 4—head capsule. Orthocladiinae, Chaetocladius piger-type: 5—head capsule. Chironominae (Chironomini), Chironomus anthracinus-type: 6—head capsule. Chironominae (Tanytarsini), Micropsectra junci-type: 7—head capsule. Chironominae (Tanytarsini), Micropsectra radialistype: 8—head capsule. li—ligula, pl—paraligula, dt—dorsomental teeth, a—antennae, ma—mandible, om—occipital margin, me—mentum, vp—ventromental plate, b—beard, p—projection on occipital margin, at—apical tooth of the mandible, it—inner teeth of the mandible, ap—antennal pedestal, pm—premandible, s—spur, pp—post-occipital plate, ss—seta submenti

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).