TABLE 2 in Two new species of Travisiidae (Annelida, Sedentaria) from Thailand

TABLE 2. Comparison of holotypes of Travisia species with branched branchiae.
Species/MorphologyT. arborifera Fauvel, 1932T. filamentosa de León-González, 1998T. satunensis sp. nov.Chaetigers363337Body length (mm)386830.6Body width (mm)10–11127.4ProstomiumRounded with a small conical tipMucronateRounded with conical tipDistribution of branchiae (chaetigers)2 to last 6–7 chaetigers3 to last 5–6 chaetigers2 to last 2 chaetigersBranchiae (pairs)292834Branchiae shapeSome branched, some pectinatedBranchedBranched and last three digitiformInterramal sensory pits visible from chaetiger1, conspicuous1–141, large (can see under stereomicroscope)Anal cirri6–8 short cirri610 cirri: 6 digitate and 4 shortDepth (m)4.5–96.9552–14

表2 具分枝鳃的特拉维斯虫属（Travisia）物种正模标本对比

| 形态学特征 | 树状特拉维斯虫（T. arborifera Fauvel, 1932） | 丝形特拉维斯虫（T. filamentosa de León-González, 1998） | 沙敦特拉维斯虫新种（T. satunensis sp. nov.） |
| --- | --- | --- | --- |
| 刚节数 | 36 | 33 | 37 |
| 体长（mm） | 38 | 68 | 30.6 |
| 体宽（mm） | 10–11 | 12 | 7.4 |
| 口前叶 | 圆形，具小型圆锥状尖端 | 具尖突 | 圆形，具圆锥状尖端 |
| 鳃分布（刚节范围） | 第2刚节至最后第6–7刚节 | 第3刚节至最后第5–6刚节 | 第2刚节至最后第2刚节 |
| 鳃对数 | 29 | 28 | 34 |
| 鳃形态 | 部分分枝，部分栉状 | 分枝状 | 分枝状，最后3对呈指状 |
| 节间感觉窝 | 自第1刚节可见，特征显著 | 1–14 | 1个，较大（体视显微镜下可观测） |
| 肛须 | 6–8根短肛须 | 6根肛须 | 10根肛须：6根指状，4根短须 |
| 栖息深度（m） | 4.5–9 | 6.9 | 552–14 |