External morphology of the larva and polytene chromosomes of Thalassomya paraskevae Makarchenko, Semenchenko, Palatov & Lisanovskaya, 2024 (Diptera, Chironomidae: Telmatogetoninae) from the Bulgarian Black Sea Coast.
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Abstract
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.
期刊介绍：
Zootaxa is a peer-reviewed international journal for rapid publication of high quality papers on any aspect of systematic zoology, with a preference for large taxonomic works such as monographs and revisions. Zootaxa considers papers on all animal taxa, both living and fossil, and especially encourages descriptions of new taxa. All types of taxonomic papers are considered, including theories and methods of systematics and phylogeny, taxonomic monographs, revisions and reviews, catalogues/checklists, biographies and bibliographies, identification guides, analysis of characters, phylogenetic relationships and zoogeographical patterns of distribution, descriptions of taxa, and nomenclature. Open access publishing option is strongly encouraged for authors with research grants and other funds. For those without grants/funds, all accepted manuscripts will be published but access is secured for subscribers only.
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