مارماهيان دهان گرد (hagfishes) >
Myxiniformes (Hagfishes) >
Myxinidae (Hagfishes) > Myxininae
Etymology: Nemamyxine: nema (Gr.), thread, i.e., a thin, elongate Myxine (See ETYFish); kreffti: In honor of German ichthyologist-herpetologist Gerhard Krefft (1912-1993), Institute für Seefischerei (Hamburg), on the occasion of his 70th birthday, for his many “valuable” contributions to oceanic ichthyology; Krefft also loaned holotype to the authors [not to be confused with his great uncle, German-born Australian adventurer and zoologist Johann Ludwig (Louis) Gerard Krefft (1830-1881), for whom several fishes are named] (See ETYFish).
Eponymy: Dr Gerhard Krefft (1912–1993) was a German ichthyologist and herpetologist whose great uncle was Johann Ludwig Gerard Krefft (below). [...] (Ref. 128868), visit book page.
محیط زیست: محیط زیست / منطقه آب و هوایی / تغييرات عمق / محدوده توزیع
بوم شناسي
دريايي موجوداتی که در اعماق زیر 200 متر زندگی و تغذیه می کنند; غير مهاجر; تغييرات عمق 80 - 800 m (Ref. 31276). Deep-water
Southwest Atlantic: off Argentina and southern Brazil.
اندازه / وزن / سن
بلوغ: Lm ?  range ? - ? cm
Max length : 40.0 cm TL جنس نر / بدون خواص جنسي; (Ref. 31276)
توصيف مختصر
كليدهاي شناسايي | ريخت شناسي | ريخت ستجي بوسيله انداره گيري
Diagnosis: Body color light to dark brown, ventral finfold with unpigmented margin. Body extremely slender, depth about 2.4-2.9% of TL. Origin of the ventral finfold well anterior to pharyngocutaneous duct (PCD). Gill pouches 8 pairs. Rostrum rounded. A 3-cusp multicusp on anterior set, a 2-cusp multicusp on posterior set of cusps; total cusps count 32-38. Total pores 124-148 (Ref. 39281).
Body shape (shape guide): eel-like.
Specimens were caught in winter months, between May and August, a period of lower water temperature due to the Falklands Current influence (Ref. 39281).
چرخه زندگی و رفتار جفتگیری
بلوغ | تولید مثل | تخم ریزی | تخم ها | باروری | توزاد ( لارو)
Copulatory organ absent. The gonads of hagfishes are situated in the peritoneal cavity. The ovary is found in the anterior portion of the gonad, and the testis is found in the posterior part. The animal becomes female if the cranial part of the gonad develops or male if the caudal part undergoes differentiation. If none develops, then the animal becomes sterile. If both anterior and posterior parts develop, then the animal becomes a functional hermaphrodite. However, hermaphroditism being characterised as functional needs to be validated by more reproduction studies (Ref. 51361 ).
Fernholm, B., 1998. Hagfish systematics. p. 33-44. In J.M. Jørgensen, J.P. Lomholt, R.E. Weber and H. Malte (eds.) The biology of hagfishes. Chapman & Hall, London. 578 p. (Ref. 31276)
وضعيت در فهرست قرمز IUCN (Ref. 130435: Version 2025-2 (Global))
خطر برای انسان ها
Harmless
استفاده انسانی
ابزارها
گزارش های ويژه
بارگيری XML
منابع اينترنتي
تخمینها بر اساس مدلها
شاخص تنوع فیلوژنتیکی (مرجع 82804) |
PD50 = 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.00115 (0.00044 - 0.00300), b=3.03 (2.80 - 3.26), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245). |
سطح تروفیک (مرجع 69278) |
3.3 ±0.6 se; based on size and trophs of closest relatives |
جهندگی (مرجع 120179) |
پايين ، كم, كمينه زمان لازم براي دو برابر شدن جمعيت 5/4 – 14 سال (Fec assumed to be <100). |
آسیبپذیری ماهیگیری (Ref. 59153) |
Moderate vulnerability (36 of 100). 🛈 |