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) >
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); annae: In honor of Anna Weigmann Huerta, the senior author’s niece, “to express its relationship” to P. kajae, named after the senior author’s daughter. (See ETYFish).
Environment: milieu / climate zone / depth range / distribution range
生態学
海 底生の; 深さの範囲 20 - 35 m (Ref. 122027). Tropical
Western Indian Ocean: Zanzibar and probably off Kenya and Somalia.
サイズ / 重さ / 年齢
Maturity: Lm ?  range ? - ? cm
Max length : 98.0 cm TL (female)
簡単な記述
形態学 | 形態計測学
This medium-sized six-gilled sawshark is distinguished by the following characters: barbel origin to anterior nostrils 1.9-2.0 times anterior nostrils to symphysis upper jaw; prenarial length 1.6-1.7 times prebarbel length; preoral length 1.5-1.7 times interdorsal space; pectoral-fin anterior margin 1.4-1.5 times dorsal-caudal space; mouth width 2.7-3.2 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 53-54; precaudal diplospondylous centra 46-49; total vertebral centra 154; generally with a shorter snout, head length 34.2-34.5% TL, preorbital length 21.7-22.0% TL, preoral length 24.6-25.1% TL, prebarbel length 12.6-12.7% TL, and barbel origin to symphysis upper jaw 12.1-12.3% TL; with lower total large lateral rostral tooth and ventral rostral spine counts, and a rostrum that is slightly constricted between barbel origin and nostrils. Similar to P. kajae, with barbels situated about half way from rostral tip to mouth, with prebarbel length about equidistant from barbel origin to symphysis of upper jaw, while in P. warreni, the barbels are situated about two thirds way from rostral tip to mouth, with prebarbel length about twice distance from barbel origin to symphysis of upper jaw. Colouration: uniform medium to dark brown dorsally without longitudinal stripes; white ventrally but with few indistinct dark blotches on belly; fins with pronounced white posterior fin margins, especially the caudal and pectoral fins; dorsal rostrum surface with two distinct longitudinal dark stripes, lateral rostral teeth dark-edged (Ref. 122027).
Probably occurs in deeper waters during the day but enters shallow water during the night. The specimens were caught directly adjacent to a dropoff along the southern tip of Unguja Island where the water depth descends rapidly from ca.20 m to >200 m (Ref. 122027).
Life cycle and mating behavior
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
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)
Human uses
より多くの情報
共通名の類義語代謝捕食動物生態毒性繁殖成熟放精卵の集合体生産力卵卵の開発
Age/Size成長体長-重さLength-length体長組成形態計測学形態学幼生幼生の動力補充豊度BRUVS
参考文献水産養殖水産養殖の紹介緊張遺伝子のElectrophoreses遺伝病気行列NutrientsMass conversion
協力者画像Stamps, Coins Misc.音シガテラ(食中毒の名前)速度泳ぐ 型式カマOtoliths脳視覚
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インターネットの情報源
Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = No PD50 data [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).
栄養段階 (Ref.
69278): 4.0 ±0.6 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): High vulnerability (59 of 100).