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ارفع صور و مقاطع فيديو
Pictures | صور قوقل![Image of Pliotrema warreni (Warren\](/images/thumbnails/jpg/tn_Plwar_f0.jpg "Image of Pliotrema warreni (Warren\")
Pliotrema warreni
Female picture by Weigmann, S.
Pictures | صور قوقل
Female picture by Weigmann, S.
التصنيف / Names الأسماء الشائعة | مرادفات | Catalog of Fishes(جنس, الانواع) | ITIS | CoL | WoRMS | Cloffa
أشلاق (القروش و الشفانين) (sharks and rays) > Pristiophoriformes (Saw sharks) > Pristiophoridae (Saw sharks)
Etymology: Pliotrema: pleion (Gr.), more; trema (Gr.), hole, referring to six gill slits compared with five in Pristiophorus (See ETYFish); warreni: In honor of English-born South African zoologist Ernest Warren (1871-1945), Director, Natal Government Museum (Pietermaritzburg), who sent specimens to the British Museum (See ETYFish).
Eponymy: Professor Dr Ernest Warren (1871–1945) was an English zoologist who moved to Natal (1903) and became first Director of the Natal Museum, Pietermaritzburg (1903–1935). [...] (Ref. 128868), visit book page.
More on author: Regan.
Etymology: Pliotrema: pleion (Gr.), more; trema (Gr.), hole, referring to six gill slits compared with five in Pristiophorus (See ETYFish); warreni: In honor of English-born South African zoologist Ernest Warren (1871-1945), Director, Natal Government Museum (Pietermaritzburg), who sent specimens to the British Museum (See ETYFish).
Eponymy: Professor Dr Ernest Warren (1871–1945) was an English zoologist who moved to Natal (1903) and became first Director of the Natal Museum, Pietermaritzburg (1903–1935). [...] (Ref. 128868), visit book page.
More on author: Regan.
Environment: milieu / climate zone / depth range / distribution range البيئة
بحري القاع; نطاق العمق 10 - 915 m (Ref. 122027), usually 60 - 430 m (Ref. 122027). Subtropical; 22°S - 37°S, 19°E - 45°E (Ref. 54706)
التوزيع دول | مناطق الفاو | النظام البيئي | الظهور | Point map | مقدمة | Faunafri
Western Indian Ocean: off Madagascar and from southern Mozambique to Cape Agulhas, South Africa.
Length at first maturity / الحجم / وزن / العمر
وصف مختصر مفاتيح التعريف | الوصف الخارجي | قياسات المظهر الخارجي
This large six-gilled sawshark is distinguished by the following characters: barbel origin to anterior nostrils 1.4-1.6 times anterior nostrils to symphysis upper jaw; prenarial length 1.3-1.4 times prebarbel length; preoral length 1.8-2.3 times interdorsal space; pectoral-fin anterior margin 1.4-1.5 times dorsal-caudal space; mouth width 3.1-3.9 times spiracle length; the first dorsal fin originates about opposite pectoral-fin free rear tips; lateral trunk dermal denticles tricuspidate, rather flat and imbricated. monospondylous centra 53-56; precaudal diplospondylous centra 4-51; total vertebral centra 154-158; rostrum not constricted between barbel origin and nostrils and barbels that are situated about two thirds way from rostral tip to mouth, with prebarbel length about twice, i.e. 1.7-2.1 times, distance from barbel origin to symphysis of upper jaw (vs. barbels situated about half way from rostral tip to mouth, with prebarbel length about equal, i.e. 1.0-1.1 times, distance from barbel origin to symphysis of upper jaw), prebarbel length 60.2-68.0% (vs. 49.4-52.9% of preoral length), preoral length 1.5-1.7 (vs. 1.9-2.0 times prebarbel length), prenarial length 1.3-1.4 (vs. 1.5-1.7 times prebarbel length). Colouration: medium to dark brown dorsally with a pronounced yellowish longitudinal stripe; uniform white ventrally; the dorsal rostrum surface with two distinct longitudinal dark stripes, lateral rostral teeth dark-edged (Ref. 122027).
Found on the continental shelf and upper slope to at least 430 m (Ref. 247). Feeds on bony fish, also shrimp, mysids and squid (Ref. 5578). Ovoviviparous (Ref. 50449), with 5 to 7 young in a litter (Ref. 247). Probably uses its saw to stun and kill prey (Ref. 5578). Sometimes caught by sports anglers (Ref. 5578).
Life cycle and mating behavior النضج | التكاثر | وضع البيض | بيض | الخصوبة | Larvae
Ovoviviparous, with 5 to 7 young in a litter (others have 7 to 17 developing eggs). Size at birth about 35 cm. Embryos feed solely on yolk (Ref. 50449).
المرجع الرئيسي
Upload your references | مراجع | المنظم : Compagno, Leonard J.V. | المتعاونين
Weigmann, S., O. Gon, R.H. Leeney, E. Barrowclift, P. Berggren, N. Jiddawi and A.J. Temple, 2020. Revision of the sixgill sawsharks, genus Pliotrema (Chondrichthyes, Pristiophoriformes), with descriptions of two new species and a redescription of P. warreni Regan. PLoS ONE, 15 (3)[0228791]:1-56. (Ref. 122027)
IUCN Red List Status (Ref. 130435: Version 2024-2)
Least Concern (LC) ; Date assessed: 16 September 2019
CITES
Not Evaluated
خطر للأنسان
Harmless
استخدامات بشرية
مصائد: غير ذات اهمية; لعبة سمكه: نعم
FAO - مصائد: ملف الأنواع; Publication: search | FishSource |
مزيد من المعلومات
Population dynamics
معاملات النمو
Max. ages / sizes
Length-weight rel.
Length-length rel.
الطول- الترددات
Mass conversion
توظيف
الوفرة
معاملات النمو
Max. ages / sizes
Length-weight rel.
Length-length rel.
الطول- الترددات
Mass conversion
توظيف
الوفرة
Anatomy
منطقة الخياشيم
Brain
Otolith
منطقة الخياشيم
Brain
Otolith
Physiology
Body composition
Nutrients
استهلاك الأوكسجين
نوع السباحة
سرعة السباحة
Visual pigments
Fish sound
Diseases & Parasites
Toxicity (LC50s)
Body composition
Nutrients
استهلاك الأوكسجين
نوع السباحة
سرعة السباحة
Visual pigments
Fish sound
Diseases & Parasites
Toxicity (LC50s)
Genetics
جيني
Heterozygosity
التوريث
جيني
Heterozygosity
التوريث
Human related
Aquaculture systems
ملامح تربية الأحياء المائية
سلالات
Ciguatera cases
Stamps, coins, misc.
Aquaculture systems
ملامح تربية الأحياء المائية
سلالات
Ciguatera cases
Stamps, coins, misc.
أدوات
E-book | دليل الميدان | Length-frequency wizard | أداة تاريخ الحياة | نقطة علي الخريطة | Classification Tree
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تقارير خاصة
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مصادر علي الأنترنت
AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | BOLDSystems | Websites from users | البحث في مراقبي الأسماك | CISTI | Catalog of Fishes: جنس, الانواع | DiscoverLife | ECOTOX | FAO - مصائد: ملف الأنواع; Publication: search | Faunafri | Fishipedia | Fishtrace | GenBank: الوراثة, نيوكلوتيدة | GloBI | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | شجرة الحياة | Wikipedia: ذهب, بحث | World Records Freshwater Fishing | Zoobank | سجلات علم الحيوانات
Estimates based on models
Preferred temperature (Ref. 123201): 11.2 - 21.7, mean 15.8 °C (based on 40 cells).
Phylogenetic diversity index (Ref. 82804): PD50 = 1.0078 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm total length, based on all LWR estimates for this body shape (Ref. 93245).
مستوى غذائي (Ref. 69278): 4.2 ±0.6 se; based on diet studies.
المرونه (Ref. 120179): منخفظ جدا, الحد الزمني الأدني لتضاعف عدد أفراد المجتمع أكثر من 14 سنة (Fec=5).
Fishing Vulnerability (Ref. 59153): Very high vulnerability (90 of 100).