Cover illustration. The axial complex of echinoderms is morphologically and functionally associated with the gonads and genital haemal ring, with the perihaemal coeloms and the oral haemal ring, with the intestinal vessels, with the perioral coelom, and with the nerve structures associated with the perihaemal coeloms and epineural canals. However, the axial complex of Crinoidea differs so dramatically from that of other echinoderms that the homology has been questioned. In this issue of the Journal of Morphology, Ezhova and Malakov (pp. 1456–1475) present a detailed microscopic anatomical analysis of the axial organ complex of crinoids and compare it with that of all other clades of echinoderms. The cover image shows a graphical reconstruction of the morphology of the axial organ of Himerometra robustipinna, perivisceral coeloms, intestine, and gonads (see Figure 1a of that paper for details).

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封面图片

封面插图。棘皮动物的轴向复合物在形态上和功能上与性腺和生殖器血环，血周腔和口腔血环，肠道血管，口周腔以及与血周腔和神经外膜相关的神经结构相关运河。然而，Crinoidea的轴向复合体与其他棘皮动物的轴向复合体差异如此之大，以至于同源性受到质疑。在本期《形态学杂志》上，Ezhova和Malakov（pp。1456–1475）提出了对喙突轴向器官复合体的详细显微解剖学分析，并将其与所有其他棘皮动物分支进行了比较。封面图像显示了鲁氏姬菇的轴向器官形态的图形重建，内脏周膜，肠和性腺（有关详细信息，请参见该论文的图1a）。