Some new silurids from the Congo
Some new silurids from the Congo
复制标题
来自刚果的一些新鲇科动物
DOI：
10.1080/00222932208632748
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发表时间：
1922
影响因子：
0.8
通讯作者：
H. Rendahl
中科院分区：
文献类型：
--
作者：
E. Lönnberg;H. Rendahl
壳非常小，宽卵形，不透明，固体，发亮，半透明，暗褐色。塔尖适度产生，与直边会议在一个角度约50;先端锐尖。轮生6，上面几乎平，但在外围很圆并且非常迅速地增加;顶端1½显微镜下具点，稍后的轮生雕刻有非常微弱、直、稍微不规则的条纹或生长线，仅在一个强的透镜下可见，被更细的、非常接近的、显微镜下的螺旋条纹穿过;缝平，下面的边缘宽并且非常强。近卵形的孔，有点使在基部变平;口唇单，锐尖;外部唇直的轮廓和几乎不后退;柱白色，稍凹，边缘狭贴生;胼胝体白色和薄。
Shell very small, broadly ovate, imperforate, solid, shining, translucent, darkish brown. Spire moderately produced, with straight sides meeting at an angle of about 50; apex acute. Whorls 6, almost flat above, but well rounded at the periphery and very rapidly increasing; the apical 1½ microscopically punctate, later whorls sculptured with very faint, straight, slightly irregular strim or growth-lines, only visible under a strong lens, crossed by much finer, extremely close, microscopic, spiral stri~ e; suture flat, broadly and very strongly margined below. Aperture subovate, somewhat flattened at the base; peristome simple, acute; outer lip straight in profile and hardly receding; columella white, slightly concave, margin narrowly adnate; callus white and thin.