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) >
Rajiformes (Skates and rays) >
Rajidae (Skates)
Etymology: Dipturus: Greek, di = two + Greek, pteryx = fin (Ref. 45335); mennii: Named for Roberto Carlos Menni..
Environment: milieu / climate zone / depth range / distribution range
生態学
海 底生の; 深さの範囲 135 - 550 m (Ref. 114953). Subtropical; 20°S - 40°S, 60°W - 40°W (Ref. 57911)
Southwest Atlantic: Brazil, from São Paulo to Rio Grande do Sul.
Length at first maturity / サイズ / 重さ / 年齢
Maturity: Lm ?, range 62 - ? cm
Max length : 167 cm TL オス/雌雄の選別がない; (Ref. 114953)
簡単な記述
形態学 | 形態計測学
Differs from its congeners by having prickly interorbital space with few developed dermal denticles an no arrangement pattern easily visible and sensible when touched. Dorsal surface smooth with nuchal thorns confluent with median dorsal and caudal thorns up to the origin of the first dorsal fin. Scapular and interdorsal thorns are present. Ventral surface with rare, few developed prickles in between the gill openings. Mature specimens reaching about 160 cm TL and 120 cm disk width. Dorsal and ventral surfaces brown, with ventral tip of pectoral fins light brown. Dorsal and ventral snout surfaces prickly with several tiny prickles. Anterior margin of pectoral fins convex in males. Orbital series thorns distributed as 4 preorbital and 2 to 3 interorbital; the postorbital thorns are absent. The rest of thorns are distributed as 2 to 5 interspiracular; 5 to 6 nuchal, 2 to 3 scapular and 12 to 18 mediodorsal. The caudal region bears 3 to 5 rows of thorns; 25 to 36 mediocaudal; 7 to 24 laterocaudal on the left and on the right; 43 to 47 alar thorns present in males, in 3 rows and 1 to 3 interdorsal; 12-16 pseudobranchial lamellae. The horizontal orbit diameter 2 times length of second dorsal fin base. The length of first dorsal fin base is equal to the interorbital distance. The dorsal region of claspers is smooth. The dental formula is 33-36/30-37.
This species is similar with Dipturus trachyderma in having the rough skin on the interorbital region; both differ from D. leptocauda, D. chilensis, and D. teevani which possess smooth interorbital region. Other body regions of D. mennii have less evident dermal denticles, but sensible when touched, and because of this, this species was mistaken for D. trachyderma.
D. mennii compared with D. trachyderma, exhibits 1 row of confluent thorns from nape to first dorsal fin origin while the latter exhibits a row of thorns in caudal region only; have 4 preorbital thorns (vs. 2); 2-3 interorbital and no postorbital thorns (vs. 1 interorbital and 1 postorbital thorn); mature males with 3 rows of alar thorns with variation of the total number 43-47 (vs. 4 rows with total 17- 48); dorsal region of claspers smooth (vs. rough); proportionally smaller in disc width and length, horizontal orbit diameter, distance between first and fifth gill openings and dorsal fins base.
D. mennii differs from other Brazilian species (leptocauda and chilensis) in spinulation arrangement; with the two exhibiting smooth dorsal region with 1 nuchal thorn and no mediodorsal and laterocaudal thorns (Ref. 42991).
Inhabit continental slopes. Oviparous (Ref. 50449). Eggs have horn-like projections on the shell (Ref. 205). Maturity size unknown, 95 cm TL male was still immature (Ref. 114953).
Life cycle and mating behavior
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449). Eggs have horn-like projections on the shell (Ref. 205).
Gomes, U.L. and C. Paragó, 2001. Espécie nova de rajídeo (Chondrichthyes, Rajiformes) do Atlântico Sul Ocidental. Bol. Do Mus. Nac., N.S., Zool., Rio de Janeiro 448:1-10. (Ref. 42991)
Human uses
より多くの情報
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
用具
特記事項
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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 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00282 (0.00133 - 0.00596), b=3.25 (3.08 - 3.42), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
栄養段階 (Ref.
69278): 4.0 ±0.6 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): Very high vulnerability (90 of 100).
