Lớp phụ Cá sụn (cá mập và cá đuối) (sharks and rays) >
Carcharhiniformes (Ground sharks) >
Pentanchidae (Deepwater catsharks)
Etymology: Bythaelurus: bythos (Gr.), depths of the sea, referring to its deepwater habitat; ailouros (Gr.), cat, probably an allusion to the vernacular “catshark,” so named for its cat-like eyes (See ETYFish); bachi: In honor of Johann Sebastian Bach (1685-1750), a “musical genius and one of the greatest composers of all time” (so named because the senior author admires Bach and not for any Bach-like feature the shark might possess, Simon Weigmann, pers. comm.) [see also B. vivaldii] (See ETYFish).
Eponymy: Johann Sebastian Bach (1685–1750) was described in the etymology as: “…a musical genius and one of the greatest composers of all time.” There is no further need here for a lengthy biography. (Ref. 128868), visit book page.
Môi trường: môi trường / vùng khí hậu / Mức độ sâu / phạm vi phân phối
Sinh thái học
biển pelagic-oceanic; mức độ sâu 910 - 1365 m (Ref. 113731). Tropical; 32°S - 34°S, 43°E - 46°E (Ref. 138856)
Western Indian Ocean: Madagascar Ridge at Walters Shoals.
Bộ gần gũi / Khối lượng (Trọng lượng) / Tuổi
Chín muồi sinh dục: Lm ?  range ? - ? cm
Max length : 42.2 cm TL con đực/không giới tính; (Ref. 113731); 44.5 cm TL (female)
Mô tả ngắn gọn
Khóa để định loại | Hình thái học | Sinh trắc học
This species is distinguished by the following characters: body firm and stout (slender in juveniles); snout long, preorbital length 4.7-7.6% TL and has a 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; its 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; length of second dorsal-fin base 6.7-9.7% TL; anal-fin base 0.7-1.3 times interdorsal space; 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; 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. Colouration: body and fins plain beige to light grayish-brown, slightly brighter on ventral side (Ref. 113731)
Cross section: flattened.
The females of this species based on total length are mature at 39.2 cm and immature at 36.1 cm, while males are mature at 40.0 cm and immature at 37.6 cm . The size at hatching based on the three post-embryonic specimens is estimated at around 12.0 cm TL (Ref. 113731).
Vòng đời và hành vi giao phối
Chín muồi sinh dục | Sự tái sinh sản | Đẻ trứng | Các trứng | Sự sinh sản | Ấu trùng
Weigmann, S., D.A. Ebert, P.J. Clerkin, M.F.W. Stehmann and G.J.P. Naylor, 2016. 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. (Ref. 113731)
Tình trạng Sách đỏ IUCN (Ref. 130435: Version 2025-2 (Global))
Mối đe dọa đối với con người
Harmless
Sử dụng của con người
Các công cụ
Báo cáo đặc biệt
Tải xuống XML
Các nguồn internet
Ước tính dựa trên mô hình
Chỉ số đa dạng phát sinh loài (Tài liệu tham khảo 82804) |
PD50 = 0.5001 [Uniqueness, from 0.5 = low to 2.0 = high]. |
|
Bayesian length-weight
|
a=0.00347 (0.00171 - 0.00701), b=3.09 (2.91 - 3.27), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245). |
Mức dinh dưỡng (Tài liệu tham khảo 69278) |
4.3 ±0.5 se; based on size and trophs of closest relatives |
Thích nghi nhanh (Tài liệu tham khảo 120179) |
thấp, thời gian nhân đôi của chủng quần tối thiểu là 4.5 - 14 năm (Preliminary low fecundity). |
Sự dễ bị tổn thương của nghề đánh cá (Ref. 59153) |
Low to moderate vulnerability (25 of 100). 🛈 |