Michailova Paraskeva
Institute of Biodiversity and Ecosystem Research; Bulgarian Academy of Sciences; 1 Tzar Osvoboditel b.;1000 Sofia; Bulgaria..
Zootaxa. 2025 Mar 28;5613(3). doi: 10.11646/zootaxa.5613.3.7.
The important larval structures of the chironomid Thalassomya paraskevae Makarchenko, Semenchenko, Palatov & Lisanovskaya, 2024, are described from specimens collected from the Bulgarian Black Sea coast town of Varna. The mandible, premandible, mentum, maxilla, antenna, clypeus and frontal apotome are described in detail. A diagnosis of the larval stage of the species is presented and compared with the closely related species Thalassomya frauenfeldi Schiner. The diploid chromosome set of T. paraskevae is 2n = 6 + B, as determined from an examination of the salivary gland chromosomes. The B chromosome was found in every individual but not in every cell. The B chromosome looks like a 'heteropycnotic' body, which in some cells has a loose structure. A characterization of the polytene chromosomes is presented, and are compared with samples from an earlier study. Low chromosomal polymorphism and two heterozygous inversions were found and the reason for this is discussed.
从保加利亚黑海沿岸城镇瓦尔纳采集的标本中，描述了2024年发现的摇蚊类拟副深海摇蚊（Thalassomya paraskevae Makarchenko, Semenchenko, Palatov & Lisanovskaya）重要的幼虫结构。详细描述了其下颚、前下颚、下唇、上颚、触角、唇基和额腹片。给出了该物种幼虫阶段的诊断，并与近缘物种弗氏深海摇蚊（Thalassomya frauenfeldi Schiner）进行了比较。通过对唾液腺染色体的检查确定，拟副深海摇蚊的二倍体染色体组为2n = 6 + B。在每个个体中都发现了B染色体，但并非每个细胞中都有。B染色体看起来像一个“异固缩”体，在某些细胞中结构松散。给出了多线染色体的特征描述，并与早期研究的样本进行了比较。发现了低染色体多态性和两个杂合倒位，并对其原因进行了讨论。
