Klára Dózsa-Farkas

Eötvös Loránd University · Department of Systematic Zoology and Ecology

Between 2019 and 2021, samplings were carried out from seashores in Italy and Croatia, where specimens were found morphologically similar to the species of the Enchytraeus albidus complex. The taxon Enchytraeus albidus was recently divided into a number of separate species, and the new Italian and Croatian specimens of Enchytraeus proved to be thre...

In this article, the descriptions of four new enchytraeid species (Enchytraeidae, Clitellata) from Jeoksangsan (Deogyusan National Park, Korea) are presented: Decimodrilus bulbosus sp. n., Fridericia jeoksangsaniensis sp. n., Fridericia sphaericoides sp. n. and Mesenchytraeus globiferus sp. n. Validity of these new species was verified by comparati...

In this paper, three new enchytraeid species (Enchytraeidae, Clitellata) are described from different mountains of Korea: Cognettia koreana sp. n., Henlea bidiverticulata sp. n. and Mesenchytraeus longidiverticulatus sp. n. Validity of these new species was confirmed by comparative morphological and molecular taxonomic analyses (based on ITS, CO1 a...

Cryptic species are such evolutionary lineages that differ genetically but cannot or can only be hardly differentiated with traditional morphological methods, so they are classified as the same species. Several cryptic species have been discovered within the family Enchytraeidae and some of them have also been described formally. During the study o...

Cave research in Hungary has developed a lot in the last decade. As a part of this progress, enchytraeid specimens were collected from Hungarian caves and were subsequently characterized by comparative morphological and molecular taxonomic analyses. Molecular phylogenetic studies based on ITS, CO1 and H3 sequences and morphological results confirme...

Two new species of the new genus Decimodrilus gen. n. are described in this paper from oak forests of South Korea using a combination of classical morphology and DNA-based molecular taxonomy. A characteristic trait of the new genus is the occurrence of the intestinal diverticula in segments IX–X. The main morphological features of the new genus are...

Colonisation and immigration history is often neglected as a factor when investigating community or species distribution patterns. However, for dynamic systems that are still reacting to large-scale environmental change, such as the retreat of the ice since the last glacial maximum, colonisation history may explain a large amount of the variation b...

The enchytraeid fauna of three areas in Jeju Island (Korea) was studied, and comparative morphological and molecular taxonomic examinations (based on CO1, ITS and H3 sequences) were performed on nine samples collected in 2016. Twenty-two enchytraeid species were recorded and identified. The descriptions of two new species ( Achaetamultisacculatasp....

The enchytraeid fauna of Mt. Hallasan (Jeju Island, Korea) was studied in 2016, and 21 enchytraeid species were recorded and identified in total. A combination of morphological and molecular analyses (based on CO1, ITS and H3 sequences) was applied. Here we give descriptions of eight new species of Enchytraeidae (Clitellata): Achaeta koreana sp. n....

One enchytraeid species, proved to be new to science, is described in this paper as Fridericia ventrochaetosa sp. nov. The new species is distinguished from similar species, especially from F. galba (Hoffmeister, 1843), which has almost the same type of spermatheca, on the basis of morphological characters and molecular data (nuclear ribosomal ITS...

The enchytraeid fauna of the Rax mountain range (Austria) was investigated. Samples were taken from five different habitats: under Pinus mugo, under Picea abies, under Larix decidua, from a mixed forest (P. abies with Betula pendula) and from an alpine meadow. Forty one enchytraeid species belonging to 12 genera were found and additionally the terr...

During the 12th International Symposium on Enchytraeidae, held in Tihany, Hungary (27–29 June 2016), the participants discussed cryptic species, i.e., species that are morphologically so similar that they are classified as the same species (Bickford et al. 2007), and how to deal with them taxonomically. Here we summarise the discussion together wit...

Five Achaeta species (A. affinis, A. bohemica sensu stricto, A. camerani, A. cf. danica, A. unibulba) and a new species, described here as A. tothi sp. n., were found during the investigation of the enchytraeid fauna of western Hungary (Őrség National Park and Kőszeg Mts.). Comparative morphological and molecular taxonomic investigations were perfo...

The enchytraeid fauna of Kőszeg Mountains (Western Hungary and Eastern Austria), hitherto unknown, was investigated in this study. Fifteen enchytraeid genera including 59 species and two other annelid worms (Hrabeiella periglandulata Pižl & Chalupský, 1984 and Parergodrilus heideri Reisinger, 1925) were identified. The latter is a new record for Hu...

Results of a comparative investigation on five Cernosvitoviella species from Hungarian Sphagnum mires including their distribution and the description of a new species, Cernosvitoviella farkasi sp. n., are presented in this paper. Cernosvitoviella atrata, C. aggtelekiensis, C. crassoductus and C. farkasi sp. n. could be easily distinguished from ea...

The phylogeny of Enchytraeidae was re-estimated to establish the relationships of the now resurrected Chamaedrilus and Euenchytraeus and to confirm their status as separate taxa. The former Cognettia (Enchytraeidae) was recently revised and split into its two senior synonyms, Chamaedrilus and Euenchytraeus, with the majority of the species transfer...

The enchytraeid fauna of the Őrség National Park (Western Hungary), hitherto unknown, was investigated in this study. 14 enchytraeid genera including 47 species and one other annelid worm (Hrabeiella periglandulata) were identified. One enchytraeid species was found to be new to science and is described in this paper as Fridericia zicsii sp. nov. T...

We give descriptions of five new enchytraeid species (Enchytraeidae, Oligochaeta) from Korea: Henlea magnaampullacea sp. n., Fridericia sphaerica sp. n., F. cusanicaformis sp. n., F. granulocyta sp. n. and Mesenchytraeus calyx sp. n., with morphological and molecular (mitochondrial cytochrome c oxidase subunit I, nuclear histone 3 genes and nuclear...

During the exploration of the enchytraeid fauna in forests and grasslands of Hungarian flat areas, a small enchytraeid species, Hemifridericia bivesiculata Christensen & Dozsa-Farkas, 2006, was found unexpectedly. This species was known previously only from one single location, Bank Island in the Canadian archipelago, and was presumed to be endemic...

We give descriptions of three new Fridericia species (Enchytraeidae, Oligochaeta) from Transylvania, Romania. Fridericia transylvanica sp. n. is a large-sized worm with a maximum of 4 chaetae per bundle. The spermathecae are separate entally and have two sac-like diverticula bent distad with the ampulla forming a common U-shaped sperm-containing ch...

The enchytraeid fauna of the Drava Floodplain (Bukkhat Forest Reserve, alder swamp and meadows at Kisszentmarton, and Barcs Nature Conservation Area belonging to the Danube-Drava National Park, Hungary) was investigated for the first time. A total of 14 enchytraeid genera, including 49 species and two other annelid worms (Hrabeiella periglandulata...

Hrabeiella periglandulata (Annelida: "Polychaeta"), one of only two known exclusively terrestrial non-clitellate annelids ("polychaetes"), has been found at an increasing number of sites in Europe and has also recently been reported from Korea. Until recently it was known only from a zone from southern Sweden across central Europe to central Italy....

The up to now unknown enchytraeid fauna of the Vértes Mountains (part of the Transdanubian Mountains, Hungary) was investigated. Eleven genera, 41 species and one subspecies were identified. One species, Fridericia mahunkai sp. n. and one subspecies Fridericia gamotheca hungarica ssp. n. are new to science. It is proposed to distinguish three subsp...

Hrabeiella periglandulata (Annelida: " Polychaeta "), one of only two known exclusively terrestrial non-clitellate annelids (" polychaetes "), has been found at an increasing number of sites in Europe and has also recently been reported from Korea. Until recently it was known only from a zone from southern Sweden across central Europe to central It...

From the Seoraksan National Park, Korea, a new enchytraeid genus, Globulidrilus gen. nov., is defined and three new species, Globulidrilus helgei sp. nov., Fridericia seoraksani sp. nov. and Mesenchytraeus longiductus sp. nov., are described. Globulidrilus also includes Marionina riparia Bretscher, 1899 augm. Černosvitov 1928, a globally distribute...

We wished to test the taxonomic status of the enchytraeid species Bryodrilus glandulosus (Dózsa-Farkas, 1990) – previously B. ehlersi glandulosus – and Mesenchytraeus kuehneltiDózsa-Farkas, 1991, and their eventual conspecifity with, respectively, B. ehlersiUde, 1892 and Mesenchytraeus pelicensisIssel, 1905. The two species were both described from...

The taxonomic status of the enchytraeid species Bryodrilus parvus Nurminen, 1970 and Bryodrilus librus (Nielsen and Christensen, 1959) was tested with respect to their possible conspecifity. B. parvus, considered as a typical northern Hol-arctic species, was also found in Hungarian lowlands. The species B. librus (Nielsen and Christensen, 1959), di...

This is the first occasion that the enchytraeid (Enchytraeidae, Oligochaeta) fauna has been investigated in Korea. 18 enchytraeid taxa (7 genera) and two terrestrial polychaetes (Hrabeiella sp. and Parergodrilus heideri) were identified. Three species are new to science (Hemienchytraeus koreanus sp. n., H. jeonjuensis sp. n. and H. quadratus sp. n....

This is the first occasion that the enchytraeid (Enchytraeidae, Oligochaeta) fauna has been investigated in Korea. 18 enchytraeid taxa (7 genera) and two terrestrial polychaetes (Hrabeiella sp. and Parergodrilus heideri) were identified. Three species are new to science (Hemienchytraeus koreanus sp. n., H. jeonjuensis sp. n. and H. quadratus sp. n....

Same species of genus Fridericia (Oligochaeta: Enchytraeidae) collected from different localities, can have small differences in their morphology, for example, the number of nephridia or length and width of the spermathecal ectal duct. During the identification of enchytraeid worms, several characteristics were investigated at the same time but pre...

A survey of the structure and variety of the nephridia in the subclass Oligochaeta is presented. The most diversified forms are discernible in the families of Megadrile earthworms Two main types can be differentiated: holonephridia and meronephridia. Both types can be exonephric when they penetrate the body-wall and open to the exterior. However, i...

A new Fridericia species (Fridericia lacii sp. nov.) is described. Including this new species the number of valid Fridericia species with two diverticula per spermatheca is 50. The present study provides an opportunity for the comparison and separation of Fridericia species on the basis of spermatheca and diverticulum characteristics. Nine tables s...

Little information is available on the distribution of soil organisms such as enchytraeids in Greek agricultural soils. Therefore the aim of this work was to study their population densities under different farming practices, in different regions, and in relation to physico-chemical soil properties such as texture, pH, organic matter content, C:N r...

Although widely distributed the parasitic rotifer Balatro calvus CLAPARÉDE, 1867 has only been sporadically observed. Here we document the presence of this species in enchytraeid (Annelida) specimens from different regions of Hungary.

A new species, Fridericia crassiductata sp. n. was described and compared by DNA fragment analyses (PCR-RFLP), with two similar species, Fridericia ratzeli ( Eisen, 1872) sensu Nielsen & Christensen ( 1959) and F. eiseni Dozsa-Farkas, 2005. The main characteristics of the new species are: 13 - 20 mm long, 0.5 - 0.7 mm wide, segment number: ( 38) -...

A new species, Fridericia crassiductata sp.n. was described and compared by DNA fragment analyses (PCR-RFLP), with two similar species, Fridericia ratzeli (Eisen,1872) sensu Nielsen & Christensen (1959) and F. eiseni Dózsa-Farkas, 2005. The main characteristics of the new species are: 13–20 mm long, 0.5–0.7 mm wide, segment number: (38)–40–56, sper...

The aim was to study the invasion of terrestrial enchytraeids into the two postglacial tundras, North-eastern Greenland and the Arctic Archipelago of Canada. The majority of species recorded have a wide distribution in the Northern Hemisphere and the species diversity is considerably lower than that of potential source regions indicating either str...

Achaeta unibulba sp. n. is described from a variety of terrestrial habitats in Europe. The new species is similar to a group of species around A. eiseni Vejdovský, 1878, having bottle-shaped glands (= setal follicles) dorsally and ventrally, the latter being only slightly smaller. Its main distinguishing characters are the fused penial bulbs formin...

This paper contains the results of a taxonomic workshop held at the Võrtsjärv Limnological Station on 15–22 May 2004, following the 6th International Symposium on Enchytraeidae. A total of 58 samples were taken from a wide diversity of habitat types; 44 enchytraeid taxa were distinguished, 40 of them were identified to species level. Twelve nominal...

The description of Achaeta antefolliculata sp. n., a new species found in Sas-hegy, a small, protected dolomite hill in Budapest, during the investigation of the enchytraeid fauna, is given. This new species of small size differs from all other Achaeta species the presence of five pairs of epidermal follicles (glandular organs), slightly protruding...

Cianid és nehézfém szennyezés hatása az élővilágra, faunára

Christensenia gen. nov., C. blocki sp. nov., is described from Signy Island, South Orkney Islands, maritime Antarctic. The new species is identical with specimens that Stephenson (1932) determined as Marionina georgiana (Michaelsen, 1888), but differs from the type material of M. georgiana. The species M. georgiana (Michaelsen, 1888) is also placed...

The reproduction biology of a recently described enchytraeid species, Enchytraeus dudichi was investigated. This species is able to reproduce both sexually and asexually by fragmentation. Data about the cocoon deposition, the incubation period, the growth of juveniles, the maturation, the occurrence of fragmentation, and the number, size, and growt...

The effect of human treading on the composition of the enchytraeid fauna was studied on hiking trails in hornbeam-oak forests in Hungary. Compaction of the soil due to continuous treading has an unfavourable influence on the enchytraeid fauna, with density and species richness decreasing significantly. However, an interesting result is that one spe...

The litter consumption of Fridericia galba and F. ratzeli was different.-from English summary

Az enchytraeidák (Oligochaeta) a mezofauna fontos csoportját alkotják, de a hazai faunát tekintve még mindig sok a tennivaló. A célt, a magyar fauna megismerését, állatföldrajzi helyzetének felmérését, 2000 óta 3 elnyert, egymásra épülő OTKA pályázat támogatásával kívánom elérni. Az első lehetővé tette az É-Középhegység kutatását, a második 2005-20...