Table 5 in Taxonomic revision of the endemic Cameroonian freshwater crab genus Louisea Cumberlidge, 1994 (Crustacea, Decapoda, Brachyura, Potamonautidae), with descriptions of two new species from Nkongsamba and Yabassi
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Table 5. Differences between the four species of the genus Louisea.
CharactersL. nkongsamba sp. nov.L. yabassi sp. nov.L. balssiL. edeaensisMajor cheliped dactylus shapeStout, straight (Fig. 8h)Stout, straight (Fig. 8e)Slender, highly arched (Fig. 8c)Stout, straight (Fig. 8a)Major cheliped propodus dentition3 large teeth (Fig. 8h)5 large teeth (Fig. 8e)2 large proximal teeth (Fig. 8c)4 large teeth (Fig. 8a)Cheliped carpus inner margin teethDistal larger than proximal (Fig. 10d)Both large and pointed (Fig. 10c)Both large and pointed (Fig. 10b)Distal larger than proximal (Fig. 10a)Intermediate tooth between exorbital and epibranchial teethLarge and triangular (Figs 4a, 7d)Large and triangular (Figs 4d, 7c)Faint, barely detectable (Figs 4b, 7b)Small but distinct (Figs 4c, 7a)Postfrontal crestFaint (Figs 4a, 7d)Prominent, clearly defined (Figs 4d, 7c)Faint (Figs 4b, 7b)Faint (Figs 4c, 7a)Sternal sulcus s2/s3Deep, ends not meeting side margins of sternum (Figs 5d, 6d)Deep, ends meeting side margins of sternum (Figs 5c, 6c)Deep, ends meeting side margins of sternum (Figs 5b, 6b)Faint and shallow, ends meeting side margins of sternum (Figs 5a, 6a)Sternal segment s3With distinct central depression (Figs 5d, 6d)No depression (Figs 5c, 6c)No depression (Figs 5b, 6b)No depression (Figs 5a, 6a)Size of anterior lobe on terminal segment (TS) of mandibular palpLarge (0.8 × TS length) (Fig. 15d)Medium (0.6 × TS length) (Fig. 15c)Small (0.5 × TS length) (Fig. 15b)Medium (0.6 × TS length) (Fig. 15a)G1TA lengthShort (0.22 × G1 length) (Fig. 11d)Medium (0.27 × G1 length) (Fig. 11c)Medium (0.28 × G1 length) (Fig. 11b)Medium (0.29 × G1 length) (Fig. 11a)
表5 路易莎蟹属(Louisea)四个物种的形态差异
| 性状 | 恩孔桑巴路易莎蟹(新种)(L. nkongsamba sp. nov.) | 亚巴希路易莎蟹(新种)(L. yabassi sp. nov.) | 巴尔西路易莎蟹(L. balssi) | 埃代阿路易莎蟹(L. edeaensis) |
| ---- | ---- | ---- | ---- | ---- |
| 大螯可动指(major cheliped dactylus)形态 | 粗壮、直(图8h) | 粗壮、直(图8e) | 纤细、高度弯曲(图8c) | 粗壮、直(图8a) |
| 大螯掌节(major cheliped propodus)齿式 | 3枚大齿(图8h) | 5枚大齿(图8e) | 2枚近端大齿(图8c) | 4枚大齿(图8a) |
| 螯腕节(cheliped carpus)内缘齿 | 远端齿大于近端齿(图10d) | 齿均大且尖锐(图10c) | 齿均大且尖锐(图10b) | 远端齿大于近端齿(图10a) |
| 眼外刺与鳃上刺间的中间齿(intermediate tooth between exorbital and epibranchial teeth) | 大且呈三角形(图4a、7d) | 大且呈三角形(图4d、7c) | 微弱,几乎不可辨(图4b、7b) | 细小但清晰可辨(图4c、7a) |
| 额后脊(postfrontal crest) | 微弱(图4a、7d) | 显著,轮廓清晰(图4d、7c) | 微弱(图4b、7b) | 微弱(图4c、7a) |
| 胸甲沟s2/s3(sternal sulcus s2/s3) | 深,末端不与胸甲侧缘汇合(图5d、6d) | 深,末端与胸甲侧缘汇合(图5c、6c) | 深,末端与胸甲侧缘汇合(图5b、6b) | 微弱且浅,末端与胸甲侧缘汇合(图5a、6a) |
| 胸甲节s3(sternal segment s3) | 具明显中央凹陷(图5d、6d) | 无凹陷(图5c、6c) | 无凹陷(图5b、6b) | 无凹陷(图5a、6a) |
| 大颚须(mandibular palp)末节(TS)前叶大小 | 大(为末节长度的0.8倍)(图15d) | 中等(为末节长度的0.6倍)(图15c) | 小(为末节长度的0.5倍)(图15b) | 中等(为末节长度的0.6倍)(图15a) |
| 雄性第一腹肢顶突(G1TA)长度 | 短(为G1长度的0.22倍)(图11d) | 中等(为G1长度的0.27倍)(图11c) | 中等(为G1长度的0.28倍)(图11b) | 中等(为G1长度的0.29倍)(图11a) |
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2025-04-04



