ABSTRACT
A new rare species of Anthalona Van Damme, Dumont & Sinev, 2011, Anthalona vandammei sp. nov. (Anomopoda: Chydoridae), is described from Thailand. It is a sister species of Neotropical Anthalona brandorffi (Sinev & Holwedell, 2002), sharing three important synapomorphies: (1) postabdomen widening distally in the anterior portion; (2) long posterior setae of valves, with the last setae located at the posteroventral angle of valves; and (3) only two flaming-torch setae of thoracic limbs IV. A. brandorffi and A. vandammei sp. nov. are similar habitually, but can be clearly distinguished by details of thoracic limb morphology. A. vandammei sp. nov. differs from A. brandorffi in (1) limb 1 IDL seta 3 with a basal spine much thicker and much longer than others, (2) longer setae e-f of endite 2 of limb I and (3) scraper 7 of limb II being only slightly smaller than scraper 6. The amphi-Pacific distribution of the brandorffi-clade of Anthalona is explained best by the Boreotropical hypothesis.
Subject(s)
Cladocera , Animals , Thailand , Animal DistributionABSTRACT
A new species of Aloninae, Karualona arcana sp. nov. (Cladocera: Chydoridae) is described from Northeast Thailand. It differs from other species of the genus Karualona Dumont Silva-Briano, 2000 by: (1) the inner distal lobe of limb I bearing two setae; (2) shape of the postabdomen; (3) setae on the apical segment of the antenna endopodite of equal thickness; and (4) the presence of setules on the anterior margin of labrum. Some morphological characteristics of this taxon do not match well with the genus diagnosis, but share several important characteristics as well, such as: (1) presence of two main head pores and minute lateral pores; (2) presence of a lateral indentation on labral plate; (3) presence of denticles on the posteroventral angle of valves; (4) two flaming-torch setae on endite of limb IV; and (5) lack of composite denticles on postabdomen.
Subject(s)
Cladocera , Animal Distribution , Animals , Body Size , ThailandABSTRACT
An intensive study of cladoceran diversity in Lake Kud-Thing, a Ramsar site of Bueng Kan Province, Thailand, was conducted. One hundred and twenty-five qualitative samples were collected from 15 localities during the period from June 2012 to November 2014. A total of 58 species belonging to 38 genera was recorded. Three species, Chydorus idrisi Sinev 2014, Karualona kwangsiensis (Chiang 1963) and Streblocerus cf. serricaudatus (Fisher 1849) are new records for Thailand. The most species rich family was Chydoridae (32 species, 55% of the encountered species in the lake) followed by Sididae (8 species, 14%) and Macrothricidae (8 species, 14%) while only a single species of Ilyocryptidae was observed. The most frequently encountered planktonic species were Ceriodaphnia cornuta Sars 1885, Bosmina cf. meridionalis Sars 1904 and Ephemeroporus barroisi (Richard 1894). A newly described chydorid, Anthalona spinifera Tiang-nga, Sinev Sanoamuang 2016, was also recorded from this lake. The number of cladocerans recorded in this study is remarkably higher than that of previous studies in other natural lakes (17-40 species) within Thailand. In addition to earlier records, the number of cladocerans of Lake Kud-Thing has been updated to 62 species, about two times higher than that of other lakes in this region. Thus, our results suggest that Lake Kud-Thing is one of the biodiversity hotspots for Cladocera of Southeast Asia.
Subject(s)
Cladocera , Animals , Biodiversity , Lakes , Plankton , ThailandABSTRACT
A new species of Cladocera, Anthalona spinifera sp. nov., is described from North-East Thailand. A. spinifera differs from most species of the genus in the setae of the inner distal lobe on limb I armed by long thin spines and in limb II having very short scraping spines 6-8, a character that is shared only with the South American Anthalona brandorffi (Sinev & Hollwedel, 2002). A. brandorffi differs from A. spinifera sp. nov. in the shape of postabdomen, in much longer posterior setae of valves, in posteroventral angle of valves armed with about 25 setules only, and in shortened setae of endite 2 of limb I. These two species form a separate advanced clade within Anthalona with Amphi-Pacific distribution.
