Ozagathus Błażewicz-Paszkowycz & Bamber, 2012, gen. nov.

Genus Ozagathus gen. nov. Diagnosis. Agathotanaid with three-articled antennule, apparent five-articled antenna; pereonites wider medially, pleon slightly narrower than pereon; mandibular molar membranous and directed proximally, lacinia mobilis reduced to apophysis; labium with prominent rounded mediodistal processes; maxilliped bases and endites naked; cheliped without pseudocoxa; pereopod coxae unfused; anterior pereopods with carpal spines; dactyli and ungues of posterior pereopods not fused, their carpi with two spines; uropod exopod a fused process on basis, endopod one-segmented, uropods held beneath pleotelson. Female without pleopods. Male with slightly more robust antennule and with poorlydeveloped pleopods. Type species. Ozagathus watharongus sp. nov. by monotypy. Etymology. From “Oz”, colloquial slang for “ Australia ”, and “agathus” derived from the prefix to the Family name (male). Remarks. The new species described below shows all the general features of an agathonataid, but is somewhat intermediate between the previously recognized genera, having the three-articled antennule and reduced uropods typical of Agathotanais Hansen, 1913, but an apparently five-articled antenna more typical of Paragathotanais. The mouthparts are generally within the range of morphology shown by the Family, although the setulose rounded distal processes on the labium are presently characteristic of Ozagathus gen. nov. Whether the tuberculation of the cheliped, a feature not previously described for an agathotanaid, is a generic character is impossible to say at present, particularly in the light of the variable presence of this feature in some genera of the Tanaellidae (see above).奥扎塔那虾属（Ozagathus gen. nov.）新属 ### 鉴别特征 隶属于阿加塔那钩虾科（Agathotanaid）类群，第一触角（antennule）为3节，第二触角（antenna）外观呈5节；躯节（pereonites）中部较宽，腹节（pleon）略窄于躯节；大颚臼齿突（mandibular molar）膜质且指向近端，动颚叶（lacinia mobilis）退化为突起；下唇（labium）具显著的圆形中远端突起；颚足（maxilliped）基节与内肢光滑无刚毛；螯肢（cheliped）无假基节（pseudocoxa）；步足（pereopod）基节（coxae）不愈合；前步骤足具腕节刺；后步骤足的指节（dactyli）与爪（ungues）不愈合，其腕节具2枚刺；尾肢（uropod）外肢（exopod）为基节上的愈合突起，内肢（endopod）为1节，尾肢收纳于尾节复合体（pleotelson）下方。雌性无腹肢（pleopods）；雄性第一触角略粗壮，腹肢发育欠佳。 ### 模式种 模式种为沃萨隆奥扎塔那虾（Ozagathus watharongus sp. nov.），为单型属。 ### 词源 词源取自俚语"Oz"（澳大利亚的口语俗称）以及源自该科名称阳性前缀的"agathus"。 ### 讨论 下文描述的新种具备阿加塔那钩虾科类群的全部通用特征，但介于已发表的各属之间，呈现过渡形态：其3节第一触角与退化尾肢的特征与1913年Hansen建立的Agathotanais属相符，而外观呈5节的第二触角则更接近Paragathotanais属。其口器形态整体处于该科的变异范围内，但下唇上具刚毛的圆形远端突起目前为奥扎塔那虾属（Ozagathus gen. nov.）所特有。目前尚无法确定螯肢的瘤突（tuberculation）是否为该属的共有特征——鉴于塔那钩虾科（Tanaellidae）部分类群中该特征的存在与否存在变异，暂无法定论。