Pérez-Pech Wilbert Andrés, DE Jesús-Navarrate Alberto, Demilio Erica, Anguas-Escalante Abril, Hansen Jesper Guldberg
El Colegio de la Frontera Sur-Unidad Chetumal. Departamento de Ecología y Sistemática. Av. Centenario km 5.5, Chetumal Quintana Roo, México.
Zootaxa. 2020 Feb 10;4731(4):zootaxa.4731.4.3. doi: 10.11646/zootaxa.4731.4.3.
Marine tardigrades were sampled at three sites on Mexico's Caribbean coast. Eleven taxa were collected, one of which is described as a new species. Styraconyx robertoi sp. nov. is characterized by: asymmetric primary clavae; dorsal cuticle with a grid-like sculpture; claws with reduced accessory hooks; females with peduncles on only two digits (the external) of legs I-IV; males with peduncles only on the external digits of legs I-III and peduncles on all four digits of leg IV. Styraconyx robertoi sp. nov. is most similar to S. craticuliformis Chang Rho, 1998 and S. kristenseni Renaud-Mornant, 1981 by having asymmetric primary clavae but differs from S. craticuliformis mainly by the number of peduncles and from S. kristenseni mainly by the presence of a grid-like dorsal sculpture. Additionally, a comparison of material collected from the same region, but reported previously only as genus level records, was carried out in order to produce a refined list of the known Mexican marine tardigrade species.
在墨西哥加勒比海岸的三个地点采集了海洋缓步动物。共收集到11个分类单元，其中一个被描述为新物种。新物种罗伯托斯氏硬甲缓步虫（Styraconyx robertoi sp. nov.）的特征如下：初级棒状体不对称；背部角质层有网格状纹饰；爪上的副钩减少；雌性仅在第一至四对足的两个趾（外侧趾）上有柄节；雄性仅在第一至三对足的外侧趾上有柄节，而在第四对足的所有四个趾上都有柄节。罗伯托斯氏硬甲缓步虫（Styraconyx robertoi sp. nov.）与1998年的克拉蒂库利氏硬甲缓步虫（S. craticuliformis Chang Rho）和1981年的克里斯滕森氏硬甲缓步虫（S. kristenseni Renaud-Mornant）最为相似，均具有不对称的初级棒状体，但与克拉蒂库利氏硬甲缓步虫的主要区别在于柄节的数量，与克里斯滕森氏硬甲缓步虫的主要区别在于是否存在网格状的背部纹饰。此外，还对从同一地区收集的材料进行了比较，这些材料此前仅作为属级记录报道，目的是生成一份更精确的墨西哥已知海洋缓步动物物种清单。
