(كوسه ها و سپرماهيان) (sharks and rays) >
Myliobatiformes (Stingrays) >
Dasyatidae (Stingrays) > Dasyatinae
Etymology: marianae: Named for Mariana R. Oliveria, daughter of Otto B.F. Gadig.
Eponymy: Mariana Ramos de Oliveira Gadig Gonçalves is the daughter of Otto Gadig, the third author. She works at the Epidemiology department, Instituto Adolpho Lutz, Santos, Brazil. (Ref. 128868), visit book page.
Environment: milieu / climate zone / تغييرات عمق / distribution range
بوم شناسي
دريايي نزديك كف زي; تغييرات عمق 2 - 15 m (Ref. 36974). Tropical; 0°S - 19°S, 38°W - 45°W (Ref. 36974)
Southwest Atlantic: along the northeastern Brazilian coast, from the state of Maranhão to southern Bahia.
Size / Weight / سن
بلوغ: Lm ? range ? - ? cm
Max length : 40.0 cm WD جنس نر / بدون خواص جنسي; (Ref. 36974)
توصيف مختصر
كليدهاي شناسايي | ريخت شناسي | ريخت ستجي بوسيله انداره گيري
This medium-sized species of Dasyatis is distinguished by the following characters: horizontal diameter of eye nearly equal to interorbital width and spiracle length; its tail is relatively short, less than two times disk width, distally filiform, with dorsal and ventral finfolds, ending approximately on same vertical line; height of dorsal finfold 1.5-2 in height of ventral finfold; the dorsal surface of disc is yellowish brown, with dark blotch between spiracles and two pairs of dark scapular and precaudal blotches; margins of disc and pelvic fins are blue dorsally; the ventral surface of disc white, with two symmetrical pairs of dark markings in adults (Ref. 36974).
Body shape (shape guide): other; Cross section: flattened.
Apparently associated with coral or sandstone reefs of the northeastern Brazilian continental shelf. Two female specimens were collected from the stomach of Rachycentron canadum (Ref. 36974). Juveniles also occurred in sandy beaches and estuaries. Ovoviviparous (Ref. 50449).
Life cycle and mating behavior
بلوغ | تولید مثل | تخم ریزی | تخم ها | Fecundity | توزاد ( لارو)
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). Distinct pairing with embrace (Ref. 205). A gravid female aborted one fully formed embryo (Ref. 36974).
Gomes, U.L., R.S. Rosa and O.B.F. Gadig, 2000. Dasyatis marianae sp. n.: a new species of stingray (Chondrichthyes: Dasyatidae) from the southwestern Atlantic. Copeia 2000(2):510-515. (Ref. 36974)
وضعيت در فهرست قرمز IUCN (Ref. 130435: Version 2025-1)
خطر برای انسان ها
Harmless
استفاده انسانی
ابزارها
گزارش های ويژه
بارگيری XML
منابع اينترنتي
Estimates based on models
Preferred temperature (مرجع
123201): 27 - 27.9, mean 27.4 °C (based on 44 cells).
Phylogenetic diversity index (مرجع
82804): PD
50 = 0.5020 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01023 (0.00626 - 0.01674), b=3.14 (3.00 - 3.28), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
Trophic level (مرجع
69278): 3.5 ±0.5 se; based on size and trophs of closest relatives
جهندگی (مرجع
120179): خیلی آهسته, كمينه زمان لازم براي دو برابر شدن جمعيت بيش از 14 سال (Fec=2).
Fishing Vulnerability (Ref.
59153): Very high vulnerability (90 of 100).
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