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> Argentiniformes (Marine smelts) > Microstomatidae (Pencil smelts)
Etymology: megalopa: Named for the extraordinarily large eye.
Eponymy: Fridtjof Nansen (1861–1930) was a Norwegian explorer, scientist, diplomat and later recipient of the Nobel Peace Prize. [...] (Ref. 128868), visit book page.

Environment: milieu / climate zone / depth range / distribution range Ekologi

marina batypelagisk; djupintervall 0 - 1300 m (Ref. 5123). Deep-water; 10°N - 20°S

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Eastern Atlantic: Ascension Island.

Size / Vikt / Age

Maturity: L_m ? range ? - ? cm
Max length : 14.0 cm SL hane/ej könsbestämd; (Ref. 5123)

Short description Bestämningsnycklar | Morfologi | Morfometri

Mjukstrålar i ryggfenan (totalt) : 9 - 10; Mjukstrålar i analfenan: 8 - 10; Ryggkotor: 44 - 45. Branchiostegal rays 4. Eye very large, eye diameter to snout length ratio > 2 to 1 (Ref. 5123).

A specimen of 12.65 cm SL had ripe ovarian eggs (Ref. 5123).

Life cycle and mating behavior Könsmognad | Reproduktion | Lek | Ägg | Fecundity | Larver

Main reference Upload your references | referenser | Koordinator | Medarbetare

Kawaguchi, K. and J.L. Butler, 1984. Fishes of the genus Nansenia (Microsomatidae) with descriptions of seven new species. Los Angeles County Mus. Contr. Sci. 352:1-22. (Ref. 5123)

IUCN Red List Status (Ref. 130435: Version 2024-1)

Data deficient (DD) ; Date assessed: 10 July 2014

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Harmless

Human uses

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Trophic ecology
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Estimates based on models

Preferred temperature (Ref. 123201): 1.9 - 2.7, mean 2.5 °C (based on 618 cells).

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.5000 [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).

Trofisk nivå (Ref. 69278): 3.3 ±0.4 se; based on size and trophs of closest relatives

Fishing Vulnerability (Ref. 59153): Low vulnerability (10 of 100).

Nansenia megalopa Kawaguchi & Butler, 1984