Review Article
Review and Catalog of the Ostracode Family Rutidermatidae (Crustacea: Myodocopa)
Table 9
Summary of characteristics of genera Metaschisma and Scleraner.
| | Scientific Name | Metaschisma nex | Scleraner trifax | Scleraner chacaoi |
| | Sex | Female | Female | Male | Female | | Maturity | m. | m. | m. | m. | | Shell length, mm | 1.49 | 1.77 | 1.96 | 1.32 | | Surface with ribs (r) or smooth (s) | s | r | s | s | | Incisur shallow or deep |
*deep |
*deep |
*deep |
*deep | | No. medial br. on rostrum | (16–20) | 15 | 12 | 11 | | (rostral infold) | | | | | | 1st antenna | | | | | | no. br. 2nd seg., d-la-v. | 1–1–1 | 1–1 | 1—1 | 1–1–1 | | no. br. 3rd seg., d-v | 1–1 | 1–2 | 2—1 | 1–2 | | no. br. 4th seg., d-v | 1–3 | 2–2 | 2–3 | 1–2 | | no. fil. on sens. br. | 4 | 2 | Numerous | 2 | | no. fil. on b.-br | 1 | 0 | 3 | 0 | | no. fil. on c.-br. | 8 | 3 | 5 | 0 | | no. fil. on g.-br. | 2 | 2 | 2 | 2 | | 2nd antenna | | | | | | endop. no. br. | 5 | 5 | 5 | 5 | | endop. no. br. 2nd seg. | 2 | 1 | 2 | 2 | | endop. no. br. 3rd seg. | abs. | abs. | 3 | abs. | | Mandible | | | | | | coxale + or − furcate endite | + | + | − | + | | basale, no. d. br. mid.-dist. | 3 | 3 | 3 | 2 | | basale, no. thin v. br. |
*5 | ? |
*9 |
*6 | | basale, no. stout v. br. |
*2 | ? |
*0 |
*0 | | basale, total no. br. | 7 | 11 | 9 | (6-7) | | ex. absent, present or rud. | rud. | abs. | Present | abs. | | 1st end. seg., no. v. br. | 4 | 3 | 3 | 3 | | 2nd end. seg., no. d. br. | 6 | 7 | 6 | 7 | | 2nd end. seg., no. v. br. excl. claw | 2 | 5 | 6 | 2 | | 3rd end. seg., no. br. excl. cl. | 7 | 4 | 6 | 4 | | Maxilla, br. on endites | 6–5–3 | ? | 9–6–5 | 7–3–4 | | 5th limb | | | | | | br. on endites | 2–2–4 | 3–5–7 | 3–5–8 | 3–4–5 | | ex. seg., no. prim. teeth | 1 | 4 | abs. | 4 | | 2nd ex. seg., no. teeth | 3 | 3 | abs. | 2 | | 2nd ex. seg., + or − bi-or | | | | | | trifurcate teeth | + | + | − | + | | 3rd ex. seg., no. br. each lobe | 1–2 | 3–2 | 3–2 | 3–2 | | 4th + 5th segs. no. br. | 4 | 4 | 5 | 8 | | 6th limb | | | | | | no. epipodial br. | 2 | 2 | 2 | 2 | | no. br. on 4 endites | 3–(2-3)–(2-3)–2 | 3–2–4–3 | 3–2–4–3 | 3–3–3–3 | | end.-seg., no. br. | 10 | (7–8) | (7–8) | 8 | | 7th limb | | | | | | no. terminal cleaning br. | 2–2 | 3–3 | 2–2 | 3–3 | | no. prox. cleaning br. | 2–2 | 2–2 | 1–1 | 1–1 | | no. comb-teeth | 17–0 | 9–2 | 7–2 | 7–2 | | Furca | | | | | | no. main claws | 4 | 3 | 3 | 4 | | no. secondary claws | 7 | 3 | 3 | 5 | | Lateral eyes, + or − | + | + | + | − | | Copulatory limbs long or short | abs. | abs. | sh. | abs. | | Specimen No. (# = USNM) | # 193930 | # 193922 | # 194019 | ZMH K 27302 |
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abs.: absent; br.: bristles; d: dorsal; dist.: distal; endop.: endopodite; ex.: exopod; fil.: filaments; l: lateral; m.: mature; no.: number; prim.: primary; prox.: proximal; rud.: rudimentary; seg.: segment; sens: sensory; v: ventral, *: Poulsen [10].
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