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Halacaridae (Acari) from Gazi Bay (Kenya): description and biogeography of three new and two known species
Chatterjee, T.; De Troch, M. (2000). Halacaridae (Acari) from Gazi Bay (Kenya): description and biogeography of three new and two known species. Hydrobiologia 427(1-3): 177-194. dx.doi.org/10.1023/A:1003979629889
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158; e-ISSN 1573-5117
Peer reviewed article  

Available in  Authors 

Keywords
    Biology > Organism morphology > Animal morphology
    Classification > Taxonomy
    Distribution > Geographical distribution
    Geography > Biogeography
    Morphology
    Morphology
    Morphology
    New records
    Taxa > Species > New taxa > New species
    Copidognathus Trouessart, 1888 [WoRMS]; Copidognathus gazii Chatterjee & De Troch, 2000 [WoRMS]; Copidognathus kenyae Chatterjee & DeTroch, 2000 [WoRMS]; Copidognathus magnipalpus (Police, 1909) [WoRMS]; Halacaridae Murray, 1877 [WoRMS]; Simognathus tropicalis Chatterjee & De Troch, 2000 [WoRMS]
    ISW, Kenya, Gazi Bay [Marine Regions]
    Marine/Coastal
Author keywords
    marine Halacaridae; Gazi Bay; Kenya

Authors  Top 
  • Chatterjee, T., correspondent
  • De Troch, M., more

Abstract
    Three new and two known halacarid species are described from benthic and epiphytic meiofauna samples nearby five seagrass species from the east coast of Kenya (Gazi Bay). Three species belong to the genus Copidognathus (subfamily Copidognathinae). The present record of C. magnipalpus (Police, 1909) is the first one for the Kenyan coast, but also for the Western Indian Ocean. C. kenyae sp.n. is new to science because of its combination of characteristics: very stout and long rostrum going upto a quarter of palpal tibiotarsus, dorsal seta 2 on ocular plate, epimeral process absent, posterior portion of anterior dorsal plate with a few rosette pores, posterodorsal plate with two costae 2-3 pores wide, few rosette pores present on lateral side of posterodorsal plate giving indication of paracostae, tibia I with two stout, thick and short setae and one slender seta ventrally. Telofemur I with a thick ventral spine like seta. Telofemora III and IV devoid of any ventral seta, tarsi III/IV with four dorsal setae. The resemblance of this species to C. curassaviensis is discussed. C. gazii sp.n. is characterised by an anterior dorsal plate with a small frontal projection, an anterior and a big posterior areolae joined together; gland pores at the lateral margin; ocular plate with an elongated posterior tail; a crescent-shaped elevated ridge at the middle. Posterodorsal plate devoid of costae and with porose panel. Telofemora III and IV devoid of ventral seta. Porose area on telofemora I/II and tibiae I/II. Tarsi III/IV with four dorsal setae. Rhombognathus scutulatus Bartsch 1983 (subfamily Rhombognathinae) is widely distributed in the Indo-Pacific region but this is the first record from the Kenyan coast. One new species of the subfamily Simognathinae was found in the Kenyan samples. Simognathus tropicalis sp.n. differs from S. uniscutatus as the posterior epimeral plate is divided into two halves, which is not the case in the latter species. A pointed apical membrane in the second palpal segment could not be distinguished. An elongated ventro-distal portion of tibia I was observed. In addition to the description of the species found in Gazi Bay, an overview of the species known from the East African coast is reported.

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