Redescription and anatomical investigation of Schroederichthys maculatus Springer, 1966 and S. saurisqualus Soto, 2001 with comments on their systematics (Chondrichthyes: Carcharhiniformes: Atelomycteridae)
Author
Soares, Karla D. A.
Universidade de São Paulo, Departamento de Zoologia, Instituto de Biociˆencias, Rua do Matão, Trav. 14, n 101, São Paulo, SP, CEP 05508 - 900, Brazil
Author
Zanini, Flávia
Universidade Federal do Rio de Janeiro, Departamento de Zoologia, Instituto de Biologia, Av. Carlos Chagas Filho, 373, Centro de Ciências e Saúde, Bloco A, Rio de Janeiro, RJ, CEP 21941 - 902, Brazil
text
Zoologischer Anzeiger
2023
2023-01-31
302
224
238
http://dx.doi.org/10.1016/j.jcz.2022.12.003
journal article
304128
10.1016/j.jcz.2022.12.003
6b151d11-143c-45e5-ab71-e2696a3161df
1873-2674
10375904
Table 2 Morphometric and meristic data of Schroederichthys saurisqualus. Data presented here are compared with data provided by Soto (2001) and Pagnoncelli (2009). Total length (TL) in mm, other measurements as percentages of TL. Numbers of specimens examined in parenthesis.| Characters | Soto (2001) (n =8) | Pagnoncelli (2009) (n =30) | Present study (n =19) |
|---|
| Total length (TL) | 92.0–692.0 | 320.0–650.0 | 293.8–626.9 |
|---|
| Precaudal length | 77.5–82.4 | 80.5–87.5 | 78.7–84.1 |
|---|
| Eye-spiracle length | – | – | 0.5–0.7 |
|---|
| Prenasal length | 2.1–4.5 | 1.9–3.4 | 1.8–3.1 |
|---|
| Preoral length | 3.5–5.9 | 3.2–4.2 | 2.2–4.4 |
|---|
| Preorbital length | 4.0–6.9 | 3.8–4.7 | 4.0–5.3 |
|---|
| Prespiracular length | 7.4–13.0 | 5.0–7.8 | 7.1–9.1 |
|---|
| Prebranchial length | 10.4–16.1 | 9.8–12.6 | 10.6–12.3 |
|---|
| Head length | 13.4–18.7 | 13.9–15.9 | 12.5–15.7 |
|---|
| Prepectoral length | 12.4–18.2 | 12.0–15.4 | 12.7–16.0 |
|---|
| Prepelvic length | 29.5–35.9 | 30.2–33.8 | 28.5–33.9 |
|---|
| Snout-vent length | 31.3–36.9 | 32.2–37.5 | 29.0–36.3 |
|---|
| Vent-caudal length | – | – | 61.6–68.3 |
|---|
| Pre-first dorsal length | 34.9–39.7 | 35.9–41.1 | 32.4–39.2 |
|---|
| Interdorsal distance | 6.8–22.3 | 17.2–24.1 | 18.9–22.8 |
|---|
| Dorsal-caudal distance | 12.9–16.3 | 12.6–17.3 | 10.1–14.3 |
|---|
| Pectoral-pelvic distance | 12.9–16.3 | 12.7–20.2 | 13.6–19.4 |
|---|
| Pelvic-anal distance | 15.4–20.8 | 17.9–23.4 | 17.1–21.1 |
|---|
| Anal-caudal distance | 14.7–18.8 | 15.1–20.3 | 14.9–18.1 |
|---|
| Interorbital distance | 4.5–9.1 | 4.2–5.6 | 4.0–5.4 |
|---|
| Internarial distance | 2.0–3.7 | 2.0–3.9 | 2.3–4.0 |
|---|
| Mouth length | 2.1–3.5 | 2.6–5.7 | 2.6–4.6 |
|---|
| Mouth width | 4.7–7.6 | 4.0–6.4 | 4.9–6.5 |
|---|
| Upper labial furrow length | 1.2–2.3 | 1.2–2.8 | 1.2–2.7 |
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| Lower labial furrow length | 1.2–2.1 | 1.0–2.1 | 1.3–2.3 |
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| Eye length | 2.9–4.7 | 3.4–5.6 | 3.2–3.8 |
|---|
| Eye height | – | – | 1.3–1.8 |
|---|
| Spiracle length | 0.4–0.7 | 0.7–1.2 | 0.5–1.2 |
|---|
| First gill slit height | 1.2–2.0 | 1.5–2.6 | 1.5–2.6 |
|---|
| Fifth gill slit height | 0.9–1.3 | 0.8–2.1 | 0.8–1.4 |
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| Pectoral length | 8.2–11.0 | 8.2–10.2 | 8.2–11.0 |
|---|
| Pectoral anterior margin | 9.5–11.8 | 9.0–12.7 | 9.7–12.6 |
|---|
| Pectoral base | 3.7–4.3 | 3.4–4.9 | 3.0–4.6 |
|---|
| Pectoral posterior margin | 5.5–8.4 | 6.2–8.3 | 5.7–8.9 |
|---|
| Pectoral inner margin | 4.0–5.3 | 4.1–5.7 | 4.7–5.8 |
|---|
| Pelvic length | 7.9–9.8 | 8.2–10.9 | 7.3–10.5 |
|---|
| Pelvic anterior margin | 5.2–6.6 | 5.5–6.7 | 5.4–7.3 |
|---|
| Pelvic posterior margin | 4.5–7.2 | 4.4–5.8 | 4.0–6.5 |
|---|
| Pelvic base | 3.2–5.1 | 4.9–6.5 | 3.7–6.2 |
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| Pelvic inner length | 4.2–5.4 | 3.1–4.5 | 2.8–7.5 |
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| Clasper outer length | 1.8–7.6 | 1.9–8.4 | 2.1–8.4 |
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| Clasper inner length | 4.2–10.4 | 4.4–11.4 | 4.4–11.3 |
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| Clasper base width | 0.6–1.6 | 0.9–2.1 | 0.6–2.0 |
|---|
| Anal anterior margin | 5.2–6.7 | 4.5–7.7 | 4.4–8.1 |
|---|
| Anal posterior margin | 4.9–8.5 | 5.1–6.4 | 5.0–7.1 |
|---|
| Anal base | 7.4–8.7 | 7.3–10.4 | 6.0–10.1 |
|---|
| Anal height | 1.8–5.0 | 1.9–3.0 | 2.2–6.5 |
|---|
| Anal inner margin | 1.7–4.1 | 1.9–4.2 | 1.9–3.2 |
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| First dorsal anterior margin | 7.1–8.3 | 6.9–8.4 | 7.2–8.3 |
|---|
| First dorsal base | 3.2–7.7 | 3.6–5.9 | 3.4–5.9 |
|---|
| First dorsal height | 3.0–7.3 | 3.1–5.9 | 3.8–5.9 |
|---|
| First dorsal inner margin | 2.4–5.3 | 2.2–4.8 | 2.0–3.1 |
|---|
| Second dorsal anterior margin | 8.3–10.4 | 7.2–10.3 | 7.9–10.4 |
|---|
| Second dorsal base | 5.8–6.8 | 5.4–6.7 | 4.6–8.1 |
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| Second dorsal height | 3.7–6.1 | 4.4–5.7 | 2.8–5.9 |
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| Second dorsal inner margin | 2.6–3.9 | 2.2–3.5 | 2.5–3.6 |
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| Dorsal caudal margin | 15.6–18.3 | 15.3–18.4 | 15.9–21.3 |
|---|
| Preventral caudal margin | 5.9–8.9 | 5.5–8.6 | 5.5–9.2 |
|---|
| 6.4–11.0 | – | 6.7–13.4 |
|---|
| Postventral caudal margin | | | |
|---|
| Subterminal caudal margin | 2.8–3.8 | 2.8–6.9 | 2.9–6.9 |
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| Terminal caudal margin | 3.2–5.7 | 2.8–4.4 | 3.3–4.6 |
|---|
| Head width | – | – | 8.2–9.6 |
|---|
| Head height | – | – | 3.0–3.9 |
|---|
| Caudal peduncle width | – | – | 0.8–1.9 |
|---|
| Caudal peduncle height | – | – | 1.2–2.0 |
|---|
| Meristics |
|---|
| Mandibular pores | – | – | |
|---|
| Hyomandibular pores | – | – | |
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| Upper tooth rows | 57–66 | 59–67 | 53–59 |
|---|
| Lower tooth rows | 37–50 | 41–59 | 41–47 |
|---|
| Pectoral radial counts | – | 12–14 | 12–15 |
|---|
| Monospondylous vertebrae | – | 37–40 | 36 |
|---|
| Total vertebrae | – | 155–169 | 153–156 |
|---|