ŠobÁŇovÁ Anna, ĎuriŠ ZdenĚk
Department of Biology and Ecology and Institute of Environmental Technologies, Faculty of Science, University of Ostrava, Chittussiho 10, 710 00 Ostrava, Czech Republic..
Zootaxa. 2018 Apr 27;4415(1):118-134. doi: 10.11646/zootaxa.4415.1.5.
A very small adult specimen of symbiotic palaemonid shrimp collected from Kavieng Lagoon, N.W. New Ireland Island, Papua New Guinea, is described as a new genus and species. Due to the slender subcylindrical body, reduced rostrum, elongated eyes and distolaterally produced uropodal exopods, the new species is somewhat similar to shrimps of the endosymbiotic sponge genus Nippontonia. Both second pereiopods are lost, but the specimen is unique by its bidentate scaphocerites, an apical corona of spiniform teeth on the mandibular molar process, five posterior telson cuspidate setae from which the median and intermediate ones are long, hooked, and the broadly spoon-like dactyli of the first pereiopods chelae with marginal pectination. Based on those characters, the new genus is without parallel among all symbiotic palaemonid shrimps. Its close phylogenetic relationship to the spongobiotic genera Nippontonia, Onycocaridella, and Thaumastocaris, is also confirmed by molecular comparison.
本文描述了从巴布亚新几内亚新爱尔兰岛西北部卡维恩泻湖采集到的一只极小的共生长臂虾成年标本，它属于一个新属新种。由于其身体细长呈亚圆柱形，额剑退化，眼睛细长，尾足外肢向远端外侧延伸，该新种在某种程度上与内共生海绵属Nippontonia的虾类相似。两只第二对步足缺失，但该标本具有独特的双齿状鳞片，下颌磨齿突上有顶端呈冠状的棘状齿，尾节有五根后尖齿刚毛，其中间和中间的刚毛长且呈钩状，第一对步足螯的指节宽匙状且边缘有栉齿。基于这些特征，这个新属在所有共生长臂虾中独一无二。分子比较也证实了它与海绵共生属Nippontonia、Onycocaridella和Thaumastocaris有密切的系统发育关系。
