分类 / Names
俗名 | 同种异名 | Catalog of Fishes(属, 种) | ITIS | CoL | WoRMS | Cloffa
Elasmobranchii
板鳃亚纲 (鲨鱼与 鱼) (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
生态学
海洋 居于水底的; 深度上下限 135 - 550 m (Ref. 114953). 熱帶; 20°S - 40°S, 60°W - 40°W (Ref. 57911)
Southwest Atlantic: Brazil, from São Paulo to Rio Grande do Sul.
西南大西洋: 巴西。
Length at first maturity / 大小 / 重量 / 年龄
Maturity: Lm ?, range 62 - ? cm
Max length : 167 cm TL 雄鱼/尚未辨别雌雄; (Ref. 114953)
简单描述
检索表 | 型态特徵 | 形态测量图
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).
有别于它的同类藉着具有多刺的眼间隔有些发展表皮的细齿没有安排图案容易看得见而有感觉的何时接触。 背面平滑的与颈背的刺汇合中央的背鳍与尾鳍刺向上到第一背鳍的起源。 肩胛与间背片刺出现。 具有稀有又很少的发展腹面刺在鳃裂之间。 成熟大约达到 160 公分TL 与 120 公分圆盘宽度的标本。 背面与腹面褐色, 与腹的胸鳍顶端鳍淡褐色。 背部与腹的吻表面多刺的有一些极小的刺。 在雄性中的胸鳍凸状的前缘。 眼窝的系列刺分布了当 4个眶前骨与 2 到 3个眼间骨; 眼眶后的刺缺席。 其它的刺被分布当 2 到 5 呼吸孔间的; 5 到 6 颈背的,2 到 3个肩胛与 12 到 18 背部中央。 尾鳍区域有 3 到 5个列的刺; 25 到 36 mediocaudal; 7 到 24 尾部后面的在左边与右边上; 43 到 47个翼的刺出现在雄性, 在 3 列与 1 到 3个间背片中; 12-16个伪鳃嗅板。 水平的眼窝直径两倍第二背鳍鳍的基底的长度。 第一背鳍鳍基底的长度是等于眼间距。 扣紧物的背部区域是平滑的。 齿式是 33-36/30-37 。
这种相似 Dipturus trachyderma 在眼间骨区域上有粗糙的皮肤; 两者都不同于持有平滑的眼间骨区域的 D. leptocauda ， D. chilensis 与 D. teevani 。 D. mennii 的其他身体区域有比较不显着表皮的细齿, 但是有感觉的当接触, 与由于这, 这种被误认为 D. trachyderma.
与 D. trachyderma 相较的 D. mennii, 展现从后颈到第一背鳍起源的融合刺的 1 列然而较后者的展现在尾部的区域一列刺唯一的; 有 4个眶前骨刺;(vs.2) 2-3个眼间骨与没有眼眶后的刺;(vs.1个眼间骨与 1个眼眶后的刺) 成熟的用总数 43-47 的变化雄性有 3 列的翼刺 (vs.4 列以总数 17- 48); 扣紧物的背部区域平滑的;(vs. 粗糙) 比例比较小的在体盘宽度与长度 , 水平的眼窝直径中, 第一与第五鳃裂与背鳍基底之间的距离。
D. mennii 与其他巴西的种 ( leptocauda 与 chilensis) 不同在刺的排列方式上; 有两个外表平滑的背部具有 1个颈背的刺与没有背部中央而尾部后面的刺.(参考文献 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).
栖息于大陆斜坡。 卵生的.(参考文献 50449) 卵在贝壳上有像触角一样的突出。 (参考文献 205)
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 仔鱼
Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449). Eggs have horn-like projections on the shell (Ref. 205).西南大西洋: 巴西。
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)
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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).
营养阶层 (Ref.
69278): 4.0 ±0.6 se; based on size and trophs of closest relatives
回复力 (Ref.
120179): 低的, 最小族群倍增时间4.5 - 14 年 (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153): Very high vulnerability (90 of 100).
