TABLE 2 in Description of the mature larva of Derovatellus lentus (Coleoptera: Dytiscidae)

TABLE 2. Number and position of secondary setae on the legs of instar III of Derovatellus lentus. Numbers between slash marks refer to pro-, meso- and metathoracic leg, respectively. A = anterior, AD = anterodorsal, AV = anteroventral, P = posterior, PD = posterodorsal, PV = posteroventral, Pr = proximal, Total = total number of secondary setae on the segment (excluding primary and natatory setae). Three specimens were studied.
SegmentPositionRangeCoxaA3 / 2–5 / 2–4PD3–4 / 3 / 3–4Total6–7 / 5–8 / 6–7TrochanterPr1 / 1–2 / 1–2Total1 / 1–2 / 1–2FemurAD4 / 4–5 / 4–5AV7–10 / 6–10 / 6–7PV5–7 / 6 / 9–10Total16–20 / 17–20 / 19–22TibiaAD2–3 / 3–4 / 3–4AV0 / 3–4 / 4–5P1 / 1 / 1PV2–4 / 2–3 / 0Total5–7 / 10–11 / 8–10TarsusA2 / 0 / 0AD0 / 3–5 / 4–5AV0 / 4–5 / 5–7PD2 / 0–1 / 1PV5–6 / 4–5 / 0Total9–10 / 12–15 / 10–12

表2. 德氏德瓦螨（Derovatellus lentus）3龄若虫足上次生刚毛的数量与着生位置。斜杠分隔的三组数字依次对应前胸足、中胸足与后胸足。各位置缩写含义如下：A=前侧（Anterior, A）、AD=前背侧（Anterodorsal, AD）、AV=前腹侧（Anteroventral, AV）、P=后侧（Posterior, P）、PD=后背侧（Posterodorsal, PD）、PV=后腹侧（Posteroventral, PV）、Pr=近心端（Proximal, Pr）；Total指该体节上次生刚毛的总数（不含初生刚毛与游泳刚毛）。本研究共观测3份标本。

各体节的刚毛数量范围如下：
1. 基节：前侧 3/2–5/2–4；前背侧 3–4/3/3–4；总刚毛数 6–7/5–8/6–7
2. 转节：近心端 1/1–2/1–2；总刚毛数 1/1–2/1–2
3. 股节：前背侧 4–5/4–5/4–5；前腹侧 7–10/6–10/6–7；后腹侧 5–7/6/9–10；总刚毛数 16–20/17–20/19–22
4. 胫节：前背侧 2–3/3–4/3–4；前腹侧 0/3–4/4–5；后侧 1/1/1；后腹侧 2–4/2–3/0；总刚毛数 5–7/10–11/8–10
5. 跗节：前侧 2/0/0；前背侧 0/3–5/4–5；前腹侧 0/4–5/5–7；后背侧 2/0–1/1；后腹侧 5–6/4–5/0；总刚毛数 9–10/12–15/10–12