Table 1 in Revision of the Siriella brevicaudata species group (Crustacea: Mysida: Mysidae) from the West Indo-Pacific

Table 1. Comparison of diagnostic morphological characters among species of the Siriella brevicaudata group (bold type indicates unique character states). Species (in alphabetical order)CharactersS. bassi sp. nov.S. brevicaudataS. gibbosaS. hanseniS. lacertilisS. lingvura sp. nov.Anterior margin of carapace:- shapeangular; apically rounded; sides concaveroundedangular; apically acute; sides concaveroundedroundedrounded- frontal extension (coverage of subrostral process)covering at least half of process Ƌ: not covering; ♀: coveringcoveringnot coveringnot coveringnot coveringCephalic tuberclepresent; larger in ♂present; larger in ♀presentabsentpresentabsentPostcervical elevationpresent; larger in ♂present; larger in ♀presentabsentpresentabsentEye corneal colorunknownblackunknownunknownred-browndark purpleTelson:- length / last abdominal somite length1.0–1.10.9unknown1.0–1.10.70.9- length / anterior width2.35–2.51.5–1.71.31.6–1.91.71.6–1.8- anterior width/ posterior width*1.3–1.51.5–1.72.31.3–1.61.41.45–1.5- N of anterolateral spiniform setae3–4333–435–6- N of posterolateral spiniform setae15–204–7410–1699–11- terminal spiniform setal length /telsonal length0.07–0.080.36–0.530.310.09–0.130.250.13–0.14- terminal spiniform setal length /subterminal setal length♂: 1.0–1.2; ♀: 0.7–1.01.2–1.63.11.0–1.21.1–1.21.2–1.6- subterminal spiniform setal length to preceding posterolateral0.8–1.41.4– 3.11.2–1.81.0–1.21.8–2.01.1–1.4Telson:- pattern of posterior spiniform setaegraded, except terminal in most of ♀♀very long 2–3 last graded pairs against 3–4 short precedingvery long one pair against 3 short precedingnearly equal 3–6 last pairs, gradually grading into posterolateralvery long 2 last graded pairs against 7 short precedinggraded- emarginationabsentpresentabsentabsentabsentabsent- apical spinulessmall, dorsally visiblevery small, dorsally invisiblesmall, dorsally visiblesmall, dorsall visiblesmall, dorsally visiblesmall, dorsally visible- length of apical spinules / terminal spiniform setae0.3–0.50.03–0.080.090.2–0.30.13–0.160.19–0.23Labral anterior spine length / rest of labral length0.25–0.3<0.1absent (?)<0.10.1–0.150.15Maxilla 1, outer ramus robust setaeserratedsmoothsmoothsmoothserratedsmoothMaxilla 2, N of endopod lateral setae2523–443–4Pereopods 1–3, meral length / width ratio4.3–4.43.0–3.33.23.5–4.44.13.5Uropods:- exopod length / width ratio3.8–4.03.1–3.42.93.8–4.03.93.6–3.7- N of exopodal spiniform setae4–83–54–53–634–5- ratio of length of exopodal segments1.9–2.02.8–3.02.71.9–2.31.4–1.51.8–2.2- N of endopodal spiniform setae22–2910–12310–1314–1515–16- pattern of endopodal spiniform setaealong entire margin, terminal reaching apex; medially in pairsalong almost entire margin, not reaching apexalong proximal half of marginalong almost entire margin, not reaching apexalong almost entire margin, not reaching apexalong almost entire margin, not reaching apexAnterior margin of carapace:- shaperoundedangular; sides straightangular, apically rounded; sides concaveroundedweakly angular or nearly roundedangular, apically rounded sides concave- frontal extension (coverage of subrostral process)not coveringcoveringcovering at least half of processnot coveringnot coveringcovering at least half of processCephalic tuberclepresent; weakabsentabsentpresent; weakabsentpresent in ♀Postcervical elevationpresentpresentabsentpresentpresentpresent in ♀Eye corneal colorunknownunknownunknownwhite; three golden-yellow horizontal stripesbrown-goldblackTelson:- length / last abdominal somite length0.90.91.00.91.01.0–1.1- length / anterior width1.6–1.71.6–1.72.0–2.11.5–1.72.0–2.12.0–2.1- anterior width/ posterior width*1.51.51.41.51.3–1.41.3- N of anterolateral spiniform setae33–433–443–4- N of posterolateral spiniform setae10–169–1312–1411–1314–1710–16- terminal spiniform setal length / telsonal length0.13–0.140.20–0.230.13–0.140.18–0.190.090.11–0.13- terminal spiniform setal length / subterminal setal length1.0–1.11.1–1.3♂: 1.2; ♀: 0.81.3–1.41.3–1.40.9–1.0- subterminal spiniform setal length to preceding posterolateral1.21.1–1.2♂: 1.2; ♀: 1.4–1.51.41.1–1.21.1–1.2Telson:- pattern of posterior spiniform setae2 equal pairs longer than precedinggradedgraded, except terminal in ♀gradedgradedterminal shorter than or equal to subterminal- emarginationabsentpresentabsentabsentabsentabsent- apical spinulessmall, dorsally visiblevery small, dorsally invisiblesmall, dorsally visiblesmall, dorsally visiblesmall, dorsally visiblesmall, dorsally visible- length of apical spinules / terminal spiniform setae0.25–0.30.10.2–0.30.20.40.2–0.3Labral anterior spine length / rest of labral length0.2<0.10.15<0.10.25–0.30.2Maxilla 1, outer ramus robust setaesmoothsmoothserratedsmoothsmoothsmoothMaxilla 2, N of endopod lateral setae3–45–623–423–4Pereopods 1–3, meral length / width ratio3.8–4.13.1–3.34.2–4.83.1–3.43.4–3.54.6–5.0Uropods:- exopod length / width ratio4.23.64.03.9–4.03.5–3.73.6–3.9- N of exopodal spiniform setae3–54–63–4 in ♀; 4–5 in ♂3–54–63–4 in ♀; 4–6 in ♂- ratio of length of exopodal segments1.72.5–3.02.51.8–1.91.7–1.81.8–1.9- N of endopodal spiniform setae11–1415–2019–27 in ♀; 15–21 in ♂10–1317–1819–25 in ♀; 15–22 in ♂- pattern of endopodal spiniform setaealong almost entire margin, not reaching apexalong almost entire margin, not reaching apexalong entire margin, terminal reaching apexalong almost entire margin, not reaching apexalong entire margin, terminal not reaching apexalong entire margin, terminal reaching apex表1 短尾西丽猛水蚤（Siriella brevicaudata）类群各物种的诊断形态特征比较（粗体标注独有特征态）。 按字母序排列的物种 特征 S. bassi 新种（sp. nov.） S. brevicaudata S. gibbosa S. hanseni S. lacertilis S. lingvura 新种（sp. nov.） 甲壳前缘： - 形状 棱角形，顶端圆润，两侧凹陷 圆形 棱角形，顶端尖，两侧凹陷 圆形 圆形 圆形 - 额突（亚喙突（subrostral process）覆盖情况） 覆盖至少一半的亚喙突 雄体（♂）：不覆盖；雌体（♀）：覆盖 覆盖 不覆盖 不覆盖 不覆盖 头结节（cephalic tubercle） 存在，雄体更大 存在，雌体更大 存在 缺失 存在 缺失 颈后隆起（postcervical elevation） 存在，雄体更大 存在，雌体更大 存在 缺失 存在 缺失 眼角膜颜色 未知 黑色 未知 未知 红棕色 深紫色 尾节（telson）： - 尾节长度/最后腹节长度 1.0–1.1 0.9 未知 1.0–1.1 0.7 0.9 - 尾节长度/前侧宽度 2.35–2.5 1.5–1.7 1.3 1.6–1.9 1.7 1.6–1.8 - 前侧宽度/后侧宽度* 1.3–1.5 1.5–1.7 2.3 1.3–1.6 1.4 1.45–1.5 - 前侧刺状刚毛（spiniform setae）数量 3–4 3 3 3–4 3 5–6 - 后侧刺状刚毛数量 15–20 4–7 4 10–16 9 9–11 - 端刺状刚毛长度/尾节长度 0.07–0.08 0.36–0.53 0.31 0.09–0.13 0.25 0.13–0.14 - 端刺状刚毛长度/亚端刚毛长度 雄体（♂）：1.0–1.2；雌体（♀）：0.7–1.0 1.2–1.6 3.1 1.0–1.2 1.1–1.2 1.2–1.6 - 亚端刺状刚毛长度与前一侧后侧刺状刚毛长度之比 0.8–1.4 1.4–3.1 1.2–1.8 1.0–1.2 1.8–2.0 1.1–1.4 尾节： - 后侧刺状刚毛排列方式 多数雌体除端刺外均渐变排列 雌体具2–3对极长的后侧刺，对应前3–4对短刺 1对极长后侧刺对应前3对短刺 近等长的3–6对后侧刺，逐渐过渡为侧刺 2对极长渐变后侧刺对应前7对短刺 渐变排列 - 尾节缺刻 缺失 存在 缺失 缺失 缺失 缺失 - 顶端小刺 小型，背面可见 极小，背面不可见 小型，背面可见 小型，背面可见 小型，背面可见 小型，背面可见 - 顶端小刺长度/端刺状刚毛长度 0.3–0.5 0.03–0.08 0.09 0.2–0.3 0.13–0.16 0.19–0.23 上唇前棘长度/上唇其余部分长度 0.25–0.3 <0.1 缺失（？） <0.1 0.1–0.15 0.15 第一颚足（Maxilla 1）外肢强壮刚毛 锯齿状 光滑 光滑 光滑 锯齿状 光滑 第二颚足（Maxilla 2）内肢侧刚毛数量 25 2 3–4 3–4 步足（Pereopods）1–3 长节长宽比 4.3–4.4 3.0–3.3 3.2 3.5–4.4 4.1 3.5 尾肢（Uropods）： - 外肢长度/宽度比 3.8–4.0 3.1–3.4 2.9 3.8–4.0 3.9 3.6–3.7 - 外肢刺状刚毛数量 4–8 3–5 4–5 3–6 3 4–5 - 外肢节长度比 1.9–2.0 2.8–3.0 2.7 1.9–2.3 1.4–1.5 1.8–2.2 - 内肢刺状刚毛数量 2 22–29 10–12 3 10–13 14–15 15–16 - 内肢刺状刚毛排列方式 沿整个边缘分布，末端刚毛达肢端 沿几乎整个边缘分布，未达肢端 沿边缘近端半段分布 沿几乎整个边缘分布，未达肢端 沿几乎整个边缘分布，未达肢端 沿几乎整个边缘分布，未达肢端 甲壳前缘： - 形状 圆形 棱角形，两侧平直 棱角形，顶端圆润，两侧凹陷 圆形 弱棱角形或近圆形 棱角形，顶端圆润，两侧凹陷 - 额突（亚喙突覆盖情况） 不覆盖 覆盖 覆盖至少一半的亚喙突 不覆盖 不覆盖 覆盖至少一半的亚喙突 头结节 存在，较弱 缺失 缺失 存在，较弱 缺失 雌体存在 颈后隆起 存在 存在 缺失 存在 存在 雌体存在 眼角膜颜色 未知 未知 未知 白色，具3条金黄色水平条纹 金棕色 黑色 尾节： - 尾节长度/最后腹节长度 0.9 0.9 1.0 0.9 1.0 1.0–1.1 - 尾节长度/前侧宽度 1.6–1.7 1.6–1.7 2.0–2.1 1.5–1.7 2.0–2.1 2.0–2.1 - 前侧宽度/后侧宽度* 1.5 1.5 1.4 1.5 1.3–1.4 1.3 - 前侧刺状刚毛数量 3 3–4 3 3–4 4 3–4 - 后侧刺状刚毛数量 10–16 9–13 12–14 11–13 14–17 10–16 - 端刺状刚毛长度/尾节长度 0.13–0.14 0.20–0.23 0.13–0.14 0.18–0.19 0.09 0.11–0.13 - 端刺状刚毛长度/亚端刚毛长度 1.0–1.1 1.1–1.3 雄体（♂）：1.2；雌体（♀）：0.8 1.3–1.4 1.3–1.4 0.9–1.0 - 亚端刺状刚毛长度与前一侧后侧刺状刚毛长度之比 1.2 1.1–1.2 雄体（♂）：1.2；雌体（♀）：1.4–1.5 1.4 1.1–1.2 1.1–1.2 尾节： - 后侧刺状刚毛排列方式 2对等长后侧刺长于前侧刺 渐变排列，雌体除端刺外均渐变排列 渐变排列 渐变排列 渐变排列 端刺短于或等于亚端刺 - 尾节缺刻 缺失 存在 缺失 缺失 缺失 缺失 - 顶端小刺 小型，背面可见 极小，背面不可见 小型，背面可见 小型，背面可见 小型，背面可见 小型，背面可见 - 顶端小刺长度/端刺状刚毛长度 0.25–0.3 0.1 0.2–0.3 0.2 0.4 0.2–0.3 上唇前棘长度/上唇其余部分长度 0.2 <0.1 0.15 <0.1 0.25–0.3 0.2 第一颚足外肢强壮刚毛 光滑 光滑 锯齿状 光滑 光滑 光滑 第二颚足内肢侧刚毛数量 3–4 5–6 2 3–4 2 3–4 步足1–3 长节长宽比 3.8–4.1 3.1–3.3 4.2–4.8 3.1–3.4 3.4–3.5 4.6–5.0 尾肢： - 外肢长度/宽度比 4.2 3.6 4.0 3.9–4.0 3.5–3.7 3.6–3.9 - 外肢刺状刚毛数量 3–5 4–6 雌体3–4；雄体4–5 3–5 4–6 雌体3–4；雄体4–6 - 外肢节长度比 1.7 2.5–3.0 2.5 1.8–1.9 1.7–1.8 1.8–1.9 - 内肢刺状刚毛数量 11–14 15–20 雌体19–27；雄体15–21 10–13 17–18 雌体19–25；雄体15–22 - 内肢刺状刚毛排列方式 沿几乎整个边缘分布，未达肢端 沿几乎整个边缘分布，未达肢端 沿整个边缘分布，末端刚毛达肢端 沿几乎整个边缘分布，未达肢端 沿整个边缘分布，末端刚毛未达肢端 沿整个边缘分布，末端刚毛达肢端