Esquete Patricia, Sibaja-Cordero Jeffrey A, Troncoso Jesús S
Departamento de Ecología y Biología Animal. Universidad de Vigo. Campus As Lagoas-Marcosende. E-36310 Vigo, Pontevedra, Spain; Email:
Departamento de Ecología y Biología Animal. Universidad de Vigo. Campus As Lagoas-Marcosende. E-36310 Vigo, Pontevedra, Spain Escuela de Biología y Centro de Investigación en Ciencias del Mar y Limnología (CIMAR), Universidad de Costa Rica, San José, Costa Rica.; Email:
Zootaxa. 2013 Nov 27;3741:228-42. doi: 10.11646/zootaxa.3741.2.2.
Samples from the scarcely-studied sedimentary seabed from the Isla del Coco (Costa Rica) yielded a single species of Tanaidacea, belonging to a new genus of Leptocheliidae, Cocotanais. The new genus shows affinities with Pseudonototanais and Heterotanais in bearing a conspicuous forcipate cheliped in the males, which in Cocotanais has a modified merus and carpal flange. Other distinct characters of the males are a triangular cephalothorax, a three-articled antennular peduncle and swollen bases of pereopods 4-6. Females have a four-articled antennule, a maxilliped endite with three distal flat spines and two inner coupling hooks, and a maxilliped basis with two long setae. The species was found in sheltered bays, both free-living in the sediment and also as a commensal of anemones (Infraorder Boloceroidaria), thus representing the first reported case of such an association.
从科科斯岛（哥斯达黎加）研究较少的沉积海床采集的样本中发现了一种等足目动物，它属于Leptocheliidae科的一个新属，即Cocotanais属。这个新属与Pseudonototanais属和Heterotanais属有亲缘关系，其雄性具有明显的钳状螯足，在Cocotanais属中，该螯足的 merus 和腕节凸缘有所改良。雄性的其他明显特征包括三角形的头胸部、三节的触角柄节以及第4至6对步足基部肿胀。雌性具有四节的触角、带有三个远端扁平刺和两个内部耦合钩的颚足内叶，以及带有两根长刚毛的颚足基部。该物种在受保护的海湾中被发现，既自由生活在沉积物中，也作为海葵（下目Boloceroidaria）的共栖生物，因此代表了此类共生关系的首次报道案例。
