TABLE 4 in Bouchetaria (Gastropoda: Cypraeidae), a new genus for the Riddle cowry, B. aenigma (Lorenz 2002), from the deep waters of the Mozambique Channel

TABLE 4. Shell comparison of B.aenigma with phylogenetically closely related species (see Figure2). The conchologically dissimilar Ipsa childreni (J. E. GRAY 1825) (see Figure 6 h) is excluded. Nesiocypraea midwayensis not obtained for molecular analyses is included for morphological comparison with Nesiocypraea teramachii.
Propustularia surinamensis (Figure 5 g)Bouchetaria aenigma (Figure 4)Nesiocypraea midwayensis (Figure 6 c-e)Nesiocypraea teramachii (Figure 6 a-b)Fossulaflat, weak denticlesprojecting,distinctly denticulateprojecting, smoothSpiresmall, pointed, partly concealedlarge, pointed, mostly exposedsmall, pointed, mostly concealedlarge, flat, exposed, or covered by callusCol. teethcoarse, extendingfine, extendingfine, restrictedfine, restricted to the peristomedental branchesrare, towards tipspresent throughoutabsentflangesfaintly pittedsmoothterminal ridgeshort, ribbed, flatlong, slopingshort, slopinglong, less slopingring of spotsabsentindicateddistinct,confluentdorsal patterndensely mottledabsentfine spotting tofine spotting to confluent blotchingcolor of baseredpure whitecreamcream to orange

表4 隐贝（Bouchetaria aenigma）与系统发育近缘物种的壳体形态对比（见图2）。贝壳学形态差异显著的查氏艾萨螺（Ipsa childreni，J. E. GRAY 1825）（见图6h）未纳入本次对比。未获取分子分析样本的中途岛宝贝（Nesiocypraea midwayensis）被纳入，用于与寺町宝贝（Nesiocypraea teramachii）开展形态学对比。本次对比涉及的物种及对应图版如下：1. 苏里南泡螺（Propustularia surinamensis，图5g）；2. 隐贝（Bouchetaria aenigma，图4）；3. 中途岛宝贝（Nesiocypraea midwayensis，图6c-e）；4. 寺町宝贝（Nesiocypraea teramachii，图6a-b）。各壳体形态特征及对应物种的性状如下：壳沟：扁平，具弱齿突；凸起，具明显齿突；凸起，光滑；凸起，具明显齿突。螺塔：小型，尖锐，部分被遮盖；大型，尖锐，多裸露；小型，尖锐，多被遮盖；大型，扁平，裸露或被胼胝覆盖。轴唇齿：粗壮，延伸至壳口；纤细，延伸至壳口；纤细，局限于壳口区域；纤细，仅局限于口围。齿支：稀少，分布于齿端；遍布全齿；无；（原文未提供对应性状）。壳缘褶边：微具凹坑；光滑；（原文未提供对应性状）；（原文未提供对应性状）。壳轴脊：短，具肋，扁平；长，倾斜；短，倾斜；长，倾斜度较小。斑点环：无；有显示；明显，愈合；（原文未提供对应性状）。背面花纹：密集斑驳；无；细斑点至；细斑点至愈合斑块。壳底颜色：红色；纯白色；奶油色；奶油色至橙色。