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Bythaelurus bachi
Weigmann, Ebert, Clerkin, Stehmann & Naylor, 2016
Bach’s Catshark
Classification: Elasmobranchii Carcharhiniformes Pentanchidae
Reference of the original description
Bythaelurus bachi n. sp., a new deep-water catshark (Carcharhiniformes, Scyliorhinidae) from the southwestern Indian Ocean, with a review of Bythaelurus species and a key to their identification. Zootaxa, 4208(5), 401–432
Bythaelurus bachi n. sp., a new deep-water catshark (Carcharhiniformes, Scyliorhinidae) from the southwestern Indian Ocean, with a review of Bythaelurus species and a key to their identification. Zootaxa, 4208(5), 401–432
Types
Bythaelurus bachi
Holotype: ZMH: 26160; Paratype: CAS: 241442; CAS: 241443; CAS: 241444; CAS: 241445; CAS: 241478; SAIAB: 202736; SAIAB: 202737; USNM: 438923; USNM: 438924; ZMH: 26161; ZMH: 26162; ZMH: 26163; ZMH: 26164; ZMH: 26165; ZMH: 26166; ZMH: 26167; ZMH: 26168; ZMH: 26169; ZMH: 26170; ZMH: 26171; ZMH: 26172; ZMH: 26173; ZMH: 26174; ZMH: 26175; ZMH: 26176; ZMH: 26177; ZMH: 26178; ZMH: 26179; ZMH: 26180; ZMH: 26181; ZMH: 26182; ZMH: 26183; ZMH: 26184; ZMH: 26185; ZMH: 26186; ZMH: 26187; ZMH: 26188; ZMH: 26189; ZMH: 26190; ZMH: 26191;
Bythaelurus bachi
Holotype: ZMH: 26160; Paratype: CAS: 241442; CAS: 241443; CAS: 241444; CAS: 241445; CAS: 241478; SAIAB: 202736; SAIAB: 202737; USNM: 438923; USNM: 438924; ZMH: 26161; ZMH: 26162; ZMH: 26163; ZMH: 26164; ZMH: 26165; ZMH: 26166; ZMH: 26167; ZMH: 26168; ZMH: 26169; ZMH: 26170; ZMH: 26171; ZMH: 26172; ZMH: 26173; ZMH: 26174; ZMH: 26175; ZMH: 26176; ZMH: 26177; ZMH: 26178; ZMH: 26179; ZMH: 26180; ZMH: 26181; ZMH: 26182; ZMH: 26183; ZMH: 26184; ZMH: 26185; ZMH: 26186; ZMH: 26187; ZMH: 26188; ZMH: 26189; ZMH: 26190; ZMH: 26191;
Images of types
Description :
Citation: Bythaelurus bachi Weigmann, Ebert, Clerkin, Stehmann & Naylor, 2016: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 12/2024
Please send your images of "Bythaelurus bachi" to info@shark-references.com
Bythaelurus bachi Weigmann, Ebert, Clerkin, Stehmann & Naylor, 2016, paratype, ZMH 26189, adult female 407 mm TL fresh, 400 mm TL 70% ethanol preserved, RV ‘Vityaz’, cruise 17, station 2735, Walters Shoals, 33°36’ S, 44°32’ E – 33°38’ S, 44°34’ E, 930–950 m depth, 29 m shrimp trawl, trawl # 68, on the bottom for 75 minutes, 19 Dec 1988 © Dr. Simon Weigmann, Elasmobranch Research Laboratory, Hamburg, Germany
Bythaelurus bachi Weigmann, Ebert, Clerkin, Stehmann & Naylor, 2016, paratype, ZMH 26189, adult female 407 mm TL fresh, 400 mm TL 70% ethanol preserved, RV ‘Vityaz’, cruise 17, station 2735, Walters Shoals, 33°36’ S, 44°32’ E – 33°38’ S, 44°34’ E, 930–950 m depth, 29 m shrimp trawl, trawl # 68, on the bottom for 75 minutes, 19 Dec 1988 © Dr. Simon Weigmann, Elasmobranch Research Laboratory, Hamburg, Germany
Common names
Bach’s Catshark
Bach’s Catshark
Short Description
Original Diagnosis of WEIGMANN, EBERT, CLERKIN, STEHMANN & NAYLOR, 2016 [24789]: A small scyliorhinid and a medium-sized Bythaelurus species with the following characteristics: body firm and stout (slender in juveniles); snout long (preorbital length 4.7–7.6% TL) and broad, bell-shaped in dorsoventral view with distinct lateral indention; pre-outer nostril length 1.1–1.9 times internarial space; preorbital snout length 0.7–1.0 times interorbital space; preoral snout length 1.0–1.9 times in mouth width; eye length 9.0– 13.0 times in predorsal distance, 3.6–5.4 times in head length and 1.4–4.1 times eye height; head length 1.8–2.7 times width at level of maximum outer extent of anterior nostrils; head width at level of maximum outer extent of anterior nostrils 1.1–1.5 times width at level of lateral indention of head, 1.1–1.8 times preorbital length, and 7.2– 10.0% TL; tongue and roof of mouth densely set with oral papillae of distinct size, which are partially very large and conglomerated from several single papillae; pelvic anterior margin 1.1–2.1 times in pectoral-fin anterior margin; first dorsal-fin base 1.0–1.8 times in interdorsal space; length of second dorsal-fin inner margin 0.5–1.9 times in second dorsal-fin height; second dorsal-fin base length 6.7–9.7% TL; anal-fin base 0.7–1.3 times interdorsal space. Coloration: body and fins plain beige to light grayish-brown, slightly brighter on ventral side. monospondylous trunk vertebrae centra 38–43, diplospondylous precaudal centra 33–43, total centra 124–132. Dermal denticle morphology highly diverse in different body areas and post-embryonic specimens with very characteristic double row each of about 20 distinctly enlarged, blunt, spatulate, cross-based dermal denticles along dorsal trunk. Claspers rather long and very thick, inner margin length 10.6–11.3% TL, base width 2.3–3.1% TL; no clasper hooks, cover rhipidion and pseudosiphon very large, envelope elongated. The new species is easily distinguished from all congeners by the plain beige to light gray-brown coloration, high diversity in dermal denticle morphology, and presence of composite oral papillae. In the western Indian Ocean, it is the only stout-bodied species of Bythaelurus with oral papillae.
Original Diagnosis of WEIGMANN, EBERT, CLERKIN, STEHMANN & NAYLOR, 2016 [24789]: A small scyliorhinid and a medium-sized Bythaelurus species with the following characteristics: body firm and stout (slender in juveniles); snout long (preorbital length 4.7–7.6% TL) and broad, bell-shaped in dorsoventral view with distinct lateral indention; pre-outer nostril length 1.1–1.9 times internarial space; preorbital snout length 0.7–1.0 times interorbital space; preoral snout length 1.0–1.9 times in mouth width; eye length 9.0– 13.0 times in predorsal distance, 3.6–5.4 times in head length and 1.4–4.1 times eye height; head length 1.8–2.7 times width at level of maximum outer extent of anterior nostrils; head width at level of maximum outer extent of anterior nostrils 1.1–1.5 times width at level of lateral indention of head, 1.1–1.8 times preorbital length, and 7.2– 10.0% TL; tongue and roof of mouth densely set with oral papillae of distinct size, which are partially very large and conglomerated from several single papillae; pelvic anterior margin 1.1–2.1 times in pectoral-fin anterior margin; first dorsal-fin base 1.0–1.8 times in interdorsal space; length of second dorsal-fin inner margin 0.5–1.9 times in second dorsal-fin height; second dorsal-fin base length 6.7–9.7% TL; anal-fin base 0.7–1.3 times interdorsal space. Coloration: body and fins plain beige to light grayish-brown, slightly brighter on ventral side. monospondylous trunk vertebrae centra 38–43, diplospondylous precaudal centra 33–43, total centra 124–132. Dermal denticle morphology highly diverse in different body areas and post-embryonic specimens with very characteristic double row each of about 20 distinctly enlarged, blunt, spatulate, cross-based dermal denticles along dorsal trunk. Claspers rather long and very thick, inner margin length 10.6–11.3% TL, base width 2.3–3.1% TL; no clasper hooks, cover rhipidion and pseudosiphon very large, envelope elongated. The new species is easily distinguished from all congeners by the plain beige to light gray-brown coloration, high diversity in dermal denticle morphology, and presence of composite oral papillae. In the western Indian Ocean, it is the only stout-bodied species of Bythaelurus with oral papillae.
Dentition
Upper jaw with 70–84 and lower jaw with 60–76 rows of small tri- to pentacuspidate teeth with outer surface of crown furrowed by strong longitudinal ridges and structured by reticulations in basal areas [24789]
Upper jaw with 70–84 and lower jaw with 60–76 rows of small tri- to pentacuspidate teeth with outer surface of crown furrowed by strong longitudinal ridges and structured by reticulations in basal areas [24789]
Remarks
shark-references Species-ID=14806;
shark-references Species-ID=14806;
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