ANEWSPECIESOF ALPHEUS (DECAPODA,CARIDEA, ALPHEIDAE ) FROMKAGOSHIMA BA Y,JAPAN
BY
KEN-ICHI HAYASHI andMICHIO NAGATA NationalFisheries University, 2-7-1 Nagata-honmachi, Shimonoseki, Y amaguchi759-6595, Japan
ABSTRACT
Anewspecies, Alpheuskagoshimanus ,collectedfrom considerable depths of KagoshimaBay, is describedand illustrated, including its live colouration. It belongs to the brevirostris species-group. Adistinctpterygostomial spine readily distinguishes the new species from all other members of this groupas wellas from all the known species of thegenus Alpheus.Apartfrom this character, it bears muchresemblance to A.acutocarinatus De Man and A. migrans Lewinsohn& Holthuisin having the remarkablylong rstpereopods and the middorsal carina of the carapace with a small,interrupted tubercle.More slender rstpereopods with 2-8 movable spines on theischium and the longer rst carpalarticle of the second pereopod are the other characters of the new species.
RÉSUMÉ
Unenouvelle espè ce, Alpheuskagoshimanus ,récolté e àgrandeprofondeur dans la baie de Kagoshima,est dé crite et illustrée, y comprissa couleur à l’état vivant. Elle appartient au groupe brevirostris .Lapré sence d’une é pinepté rygostomienne distincte la distingue nettement des autres membresde ce groupe comme des autres espè ces du genre Alpheus.Cecaractè re mis à part, l’espèce ressemble beaucoup à A.acutocarinatus De Man et A. migrans Lewinsohn& Holthuis parles premiers pé ré iopodes remarquablement longs et un petit tubercule é moussésur la carè ne médiodorsale de la carapace.Les premiers pé ré iopodes plus grê les, portant 2-8 é pinesmobiles sur l’ischionet le premier article du carpe du second pé ré iopode plus long sont les autres caractè res distinctifsde la nouvelle espè ce.
INTRODUCTION
Alpheidshrimps are the most commonin tropical andtemperate shallow waters (Banner& Banner,1982 ),but several species are knownto occur in deep seas (Chace,1988). Recently, nine unique specimens ofthe genus Alpheus were obtainedfrom the central part ofKagoshimaBay, Japan from depths of 223-240 m. Theybelong to asingle species ofthe brevirostris species-groupand are, at rst
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