Yamasaki Hiroshi, Neuhaus Birger, George Kai Horst
Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity, Invalidenstr. 43, D-10115 Berlin, Germany Senckenberg am Meer, Abt. Deutsches Zentrum für Marine Biodiversitätsforschung DZMB, Südstrand 44, D-26382 Wilhelmshaven, Germany.
Zootaxa. 2018 Feb 27;4387(3):541-566. doi: 10.11646/zootaxa.4387.3.8.
Two new species of Echinoderes from the Eratosthenes Seamount and a deep-sea station near the Sedlo Seamount are described. Echinoderes multiporus sp. nov. from the Eratosthenes Seamount is characterized by a combination of the presence of middorsal acicular spines on segments 4, 6, and 8, ventrolateral tubes on segment 2, lateroventral tubes on segment 5, lateroventral acicular spines on segments 6-9, midlateral tubes on segment 10, and type-2 glandular cell outlets in subdorsal position on segment 2 and in laterodorsal position on segments 4-9. Echinoderes unispinosus sp. nov. from the deep-sea station differs from its congeners by the combination of middorsal acicular spine on segment 4, lateroventral acicular spines on segments 6 and 7, type-2 glandular cell outlets present in midlateral position on segment 1, in subdorsal, laterodorsal, sublateral, and ventrolateral position on segment 2, in lateral accessory position on segment 5, and in sublateral position on segment 8, and densely aligned pectinate fringe teeth of the primary pectinate fringes similar in width on segments 1-10. In addition, the morphological data of two undescribed species from the Anaximenes Seamount and a deep-sea station near the Sedlo Seamount are given. An undescribed species from the Anaximenes Seamount is morphologically similar to Echinoderes unispinosus sp. nov., but differs in the smaller trunk length, the presence of broader pectinate fringe teeth of the primary pectinate fringe on segment 1, and the absence of ventromedial sensory spots on segment 8. Another undescribed species from the deep-sea station differs from its congeners in the pattern of spines, tubes, and type-2 glandular cell outlets and length of middorsal and lateral terminal spines. New names are not given to both undescribed species in this study, because only one specimen is available for each species, and both of the specimens were damaged during the preparation.
本文描述了来自埃拉托色尼海山和塞德洛海山附近一个深海站点的两种新海螨类物种。来自埃拉托色尼海山的多孔海螨新种（Echinoderes multiporus sp. nov.）的特征在于：第4、6和8节有中背针状刺，第2节有腹侧管，第5节有侧腹管，第6 - 9节有侧腹针状刺，第10节有中侧管，以及第2节背下位置和第4 - 9节背侧位置有2型腺细胞出口。来自深海站点的单刺海螨新种（Echinoderes unispinosus sp. nov.）与其同属物种的区别在于：第4节有中背针状刺，第6和7节有侧腹针状刺，第1节中侧位置、第2节背下、背侧、外侧和腹侧位置、第5节外侧附属位置以及第8节8节外侧位置有2型腺细胞出口，并且第1 - 10节初级栉状缘的栉状缘齿宽度相近且排列密集。此外，还给出了来自阿那克西曼德海山和塞德洛海山附近一个深海站点的两种未描述物种的形态学数据。来自阿那克西曼德海山的一个未描述物种在形态上与单刺海螨新种相似，但躯干长度较短，第1节初级栉状缘的栉状缘齿更宽，且第8节没有腹内侧感觉斑。来自深海站点的另一个未描述物种在刺、管和2型腺细胞出口的模式以及中背和侧端刺的长度方面与其同属物种不同。本研究中未给这两个未描述物种命名，因为每个物种仅有一个标本，且两个标本在制备过程中均有损坏。
