European journal of taxonomy : EJT
Paris : Muséum National d'Histoire Naturelle
ISSN: 2118-9773
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471
During a survey of the fishes in the region of the Wonga-Wongué Presidential Reserve, 14 new populations of the subgenus Chromaphyosemion Myers, 1924 were found. These observations extend the previously known distribution range of the subgenus 120 kilometres southward. None of these populations could be related to any described species. Based on the colouration of the males and females, together with a genetic marker (mitochondrial DNA cytochrome b sequences), the populations studied are grouped into six new species which are described in this article, all close to Aphyosemion alpha Huber, 1998 with which they share the presence of a black alpha-shaped mark on the pre- and post-opercular region. The group composed of A. alpha and the six new species is referred to here as the A. alpha species group. All the new species, A. aurantiacum Chirio, Legros & Agnèse sp. nov., A. barakoniense Chirio, Legros & Agnèse sp. nov., A. flammulatum Chirio, Legros & Agnèse sp. nov., A. flavocyaneum Chirio, Legros & Agnèse sp. nov., A. pusillum Chirio, Legros & Agnèse sp. nov. and A. rubrogaster Chirio, Legros & Agnèse sp. nov., are further unambiguously diagnosed by unique combinations of colour patterns, making it possible to generate an identification key for the A. alpha species group. It is likely that the coastal dunes of Wonga-Wongué that form a sandy relief, could have led to the fragmentation and then isolation of the hydrographical networks that flow into the Atlantic Ocean, making possible a significant number of allopatric speciations.
460
The genus Disparalona Fryer, 1968 comprises a well-defined species complex, the hamatagroup, which might have sibling species in South America. This hamata-group needs urgent revision. Besides that, a complete morphological evaluation of the endemic species D. leptorhyncha (Daday, 1905) is lacking. Thus, the aim of the present study is to revise populations of species of the hamatagroup in South America and to redescribe D. leptorhyncha. Our findings pointed to an occurrence of species which are part of the Disparalona (Mixopleuroxus) linage. Currently, the Neotropics have the highest diversity to the genus, with three species of the hamata-complex – D. (M.) hamata (Birge, 1879), D. (M.) lucianae sp. nov., D. (M.) tenuispina sp. nov. – in addition to D. (M.) leptorhyncha. These species can be differentiated from each other by the morphology of their rostrum, labrum, and postabdomen.
421
We describe two new species of the annelid genus Trilobodrilus Remane, 1925 (Dinophilidae Verill, 1892) from an intertidal and a subtidal location in San Diego, California. These two species show morphological and molecular divergences between each other and the previously described, geographically distant species. Intertidal T. windansea sp. nov. differs from subtidal T. ellenscrippsae sp. nov. most remarkably in the number and pattern of ciliary tufts and bands on the prostomium and along the body length, besides showing ca. 15% difference in gene fragments of COI and CytB. Trilobodrilus windansea sp. nov., though nesting with T. ellenscrippsae sp. nov. in the molecular phylogenetic analyses, morphologically resembles the Japanese T. itoi Kajihara, Ikoma, Yamasaki & Hiruta, 2015 most closely, but still differs from this species in the higher number of apical ciliary tufts, an additional ciliary row posterior to the second ciliary band, and by lacking a forth ciliary band and segmentally arranged lateral ciliary tufts. Trilobodrilus ellenscrippsae sp. nov. is morphologically most similar to the Japanese T. nipponicus Uchida & Okuda, 1943, but is much shorter, has more apical ciliary tufts, and less regularly arranged lateral ciliary tufts along the body. All species differ significantly in all compared gene fragments, and no obvious correlation was found between habitat and the species morphology or relationships.
436
The kinorhynch species Echinoderes levanderi Karling, 1954 is redescribed. The species can now be recognized by the presence of spines in middorsal positions on segments 4–8, and in lateroventral positions on segments 6–9, with lateroventral spines on segment 9 showing sexual dimorphism; tubes in subdorsal and ventrolateral positions on segment 2, in sublateral positions on segments 4 and 8, in lateroventral positions on segment 5, and in laterodorsal positions on segment 10. Furthermore, the enlarged sieve plates on segment 9 make the species highly characteristic. New records of the species extend its distributional range into the Bothnian Bay where the bottom water salinity drops below 5 ppt, which is the lowest salinity recorded for a habitat with kinorhynchs.
424
The described Afrotropical species of the genus Hexophthalma Karsch, 1879 (under the genus name Sicarius Walckenaer, 1847), of the spider family Sicariidae Keyserling, 1880, were recently reviewed. In the present paper the Afrotropical species of the genus Hexophthalma are revisited. After a thorough examination of all the available specimens from nine major collections, the species H. testacea (Purcell, 1908) is here synonymized with H. hahni (Karsch, 1878), three new species are described – H. binfordae sp. nov., H. goanikontesensis sp. nov. (both from Namibia) and H. leroyi sp. nov. (from South Africa) – and the male of H. dolichocephala (Lawrence, 1928) is described for the first time. The distribution of the species is also revised and a new updated key to the species is compiled.
395
Chigger mites of the African continent are reviewed using data acquired from the literature and examination of the collections deposited at the Royal Museum for Central Africa (Tervuren, Belgium) and the Natural History Museum (London, UK). All findings for 443 valid chigger species belonging to 61 genera are reported, along with details on their collection locality and host species. Three new synonyms are proposed: Straelensia Vercammen-Grandjean & Kolebinova, 1968 (= Anasuscuta Brown, 2009 syn. nov.); Herpetacarus (Herpetacarus) Vercammen-Grandjean, 1960 (= Herpetacarus (Lukoschuskaaia) Kolebinova & Vercammen-Grandjean, 1980 syn. nov.); Gahrliepia brennani (Jadin & Vercammen-Grandjean, 1952) (= Gahrliepia traubi Audy, Lawrence & Vercammen-Grandjean, 1961 syn. nov.). A new replacement name is proposed: Microtrombicula squirreli Stekolnikov, 2017 nom. nov. pro Eltonella myonacis heliosciuri Vercammen-Grandjean, 1965 (praeocc. Vercammen-Grandjean, 1965). Ninety new combinations are proposed. Keys to subfamilies, genera and subgenera of African trombiculid larvae and diagnoses of these taxa are given.
405
Two new species of the family Selachinematidae Cobb, 1915 from an intertidal sandy flat in the East China Sea are described. Both species are distinct rapacious nematodes, preying on other nematodes. Gammanema magnum sp. nov. is characterized by its leaf-like labial setae, large loop-shaped amphideal fovea in the male and small spiral ones in the female, an anterior buccal cavity reinforced by 12 rhabdia, each rhabdion with about six denticles, and two unequally long spicules. Gammanema magnum sp. nov. is a striking species, exhibiting extreme sexual dimorphism in the amphideal fovea, but lacking a gubernaculum or precloacal supplements, all features by which it can be differentiated from congeneric species. Synonchium caudatubatum sp. nov. is characterized by a posterior buccal cavity, with three mandibles each with a large tooth flanked by three smaller teeth on both sides, a transverse oval-shaped multispiral amphideal fovea, and a bluntly rounded tail with a protuberant caudal duct. Synonchium caudatubatum sp. nov. is unique in the genus in having a protuberant caudal duct in the tail end. Furthermore, it differs from its congeners by its mandibles, which have seven teeth each. Synonchium caudatubatum sp. nov. lacks a gubernaculum and a precloacal supplement, both features present in congeners except S. depressum Gerlach, 1954.
396
Following a taxonomic revision of Begonia L. (Begoniaceae, Cucurbitales) from Northeast India based on 332 herbarium specimens, 38 species are confirmed to occur in the region, of which ten are endemic. One new species is described, Begonia koelzii R.Camfield sp. nov., in B. sect. Platycentrum (Klotzsch) A.DC. One species is reduced into synonymy; B. barbata Wall. is now a synonym of B. thomsonii A.DC. Three species, B. difformis (Irmsch.) W.C.Leong, C.I Peng & K.F.Chung, B. labordei H.Lév. and B. handelii Irmsch., are reported new for India, and B. lushaiensis C.E.C.Fisch. is reinstated as an accepted species, having previously been synonymised under B. modestiflora Kurz. A key to the species in the region and preliminary conservation assessments are presented.
392
The species of the subgenus Conocetus Desbrochers des Loges, 1875 are reviewed and Polydrusus (Conocetus) transjordanus sp. nov. is described. Upon examination of the holotype of Polydrusus bardus Gyllenhal, 1834, it was observed that the species hitherto determined sensu auctorum as P. bardus was a misidentification. The specimen in question was therefore unnamed and is thus newly described as Polydrusus (Conocetus) crinipes sp. nov. Polydrusus femoratus (Stierlin, 1888) is a junior synonym of P. angustus (Lucas, 1854). Polydrusus gracilicornis Kiesenwetter, 1864, P. cylindrithorax (Desbrochers des Loges, 1900) and P. quadraticollis (Desbrochers des Loges, 1902) are proposed as junior synonyms of P. bardus. Polydrusus zurcheri (Schilsky, 1912) is proposed as a junior synonym of P. grandiceps (Desbrochers des Loges, 1875). Polydrusus kahri Kirsch, 1865 is transferred from subgenus Conocetus to Denticonocetus subgen. nov., with P. siculus Desbrochers des Loges, 1872 and P. vodozi Desbrochers des Loges, 1903 both recognized as new junior synonyms of P. kahri. The lectotypes of P. gracilicornis, P. zurcheri, P. marcidus Kiesenwetter, 1864, P. gracilis (Stierlin, 1888), P. rhodiacus (Schilsky, 1912) and P. grandiceps are designated. A key, figures, label data and distribution maps are provided for all species, except for P. longus (Stierlin, 1884), for which no specimens were available for examination, and whose placement in the subgenus Conocetus remains uncertain (thus categorized as incertae sedis). Polydrusus angustus is recorded for the first time for Italy, P. rhodiacus for mainland Turkey and P. festae (Solari, 1925) for Greece.
394
Damacornu gen. nov. (type species: D. transversum gen. et sp. nov.), Geotypodon papei sp. nov. and Spinotarsus fortehamatus sp. nov. are described, and Helicochetus dimidiatus (Peters, 1855), H. mutaba Kraus, 1960 and Hoffmanides dissutus (Hoffman, 1963) are recorded from the Udzungwa Mts, Tanzania. A complete overview of the 39 odontopygid species now known from the Udzungwa Mts is given, including notes on endemism, biogeographical relationships and altitudinal distribution patterns.