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Glaucostegus obtusus (Müller & Henle, 1841)

Widenose guitarfish
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Glaucostegus obtusus
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分類 / Names 共通名の | 類義語 | Catalog of Fishes(部類, 種) | ITIS | CoL | WoRMS | Cloffa

板鰓亜鋼(サメとエイ類) (sharks and rays) > Rhinopristiformes (Shovelnose rays) > Glaucostegidae (Giant guitarfishes)
Etymology: More on authors: Müller & Henle.

Environment: milieu / climate zone / depth range / distribution range 生態学

海 底生の; 深さの範囲 ? - 60 m (Ref. 114953). Tropical; 25°N - 0°N, 61°E - 105°E (Ref. 114953)

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Northern Indian Ocean: Pakistan to Thailand, with eastern limits unclear (Ref. 114953). South African records refer to Rhinobatos blochii and Rhinobatos leucospilus (Compagno pers. comm.).

サイズ / 重さ / 年齢

Maturity: Lm ?  range ? - 48 cm
Max length : 93.0 cm TL オス/雌雄の選別がない; (Ref. 9909)

簡単な記述 検索表 | 形態学 | 形態計測学

This species is distinguished by the following: colour uniform greyish to brownish body and shovel-shaped disc; short snout broadly triangular, broad oblique nostrils with an oval anterior opening; disc flattened centrally, its length ca 1.2 times its width, anterior margin largely convex, outer corner broadly rounded to abruptly angular; snout relatively obtuse, ca. 80° angle, tip broadly rounded and not extended forward as a lobe, very small orbit its length ca 6.5 time preorbital length, 2.5-2.7 in interorbital space; rostral ridges are well separated, margin of cranium sharply demarcated before eyes; one small spiracular fold; nostrils much shorter than mouth, subequal to internasal width, ca. 50-52 nasal lamellae; anterior nasal flaps barely penetrating into internasal space, the interspace equal to 2.4-2.5 times length of posterior nasal aperture; rough skin covered with small denticles, enlarged slightly and more granular on dorsal surface than ventrally; along midline of the body in young are thorns in irregular row, irregular in shape, often obscure in adults; no obvious patch on each shoulder or greatly enlarged thorns in snout tip and around orbits; long tail, 1.4-1.6 times disc length; short dorsal fins, apices rounded, close together, interspace exceeding twice base length of first dorsal fin, well separated from pelvic fins (Ref. 114953).

生物学     用語集 (例 epibenthic)

Found inshore and offshore (Ref. 9909). Ovoviviparous (Ref. 50449). Biology little known (Ref. 9909); but males are known to be mature ca. 48 cm TL (Ref. 114953). Probably utilized where it occurs, but details lacking (Ref. 9909).

Life cycle and mating behavior Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 幼生

Exhibit ovoviparity (aplacental viviparity), with embryos feeding initially on yolk, then receiving additional nourishment from the mother by indirect absorption of uterine fluid enriched with mucus, fat or protein through specialised structures (Ref. 50449).

主な参考文献 Upload your references | 参考文献 | コーディネーター | 協力者

Compagno, L.J.V., 1999. Checklist of living elasmobranchs. p. 471-498. In W.C. Hamlett (ed.) Sharks, skates, and rays: the biology of elasmobranch fishes. Johns Hopkins University Press, Maryland. (Ref. 35766)

IUCNのレッドリストの状況は (Ref. 130435)

  絶滅寸前の危機的状況 (CR) (A2bd); Date assessed: 03 December 2018

CITES

Appendix II: International trade monitored

CMS (Ref. 116361)

Not Evaluated

人間に対する脅威

  Harmless





Human uses

FAO - Publication: search | FishSource |

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Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5156   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00372 (0.00145 - 0.00950), b=3.09 (2.87 - 3.31), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
栄養段階 (Ref. 69278):  3.5   ±0.5 se; based on size and trophs of closest relatives
回復力 (Ref. 120179):  低い, ４．５年～１４年の倍増期間の最小個体群 (Fec assumed to be <100).
Fishing Vulnerability (Ref. 59153):  High vulnerability (57 of 100).