Classificatie / Names
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Gobiiformes (Gobies) >
Milyeringidae (Blind cave gudgeons)
Etymology: Typhleotris: Greek, typhlos = blind + the name of a Nile fish, eleotris (Ref. 45335); mararybe: From the Malagasy 'marary' (ill or sick), and 'be' (big), meaning very sick or big sickness; in reference to the strange debilitating viral illness or sinkhole fever members of the expedition team contracted after snorkeling in Grotte de Vitane (Ref. 93144).
Environment: milieu / climate zone / depth range / distribution range
Ecologie
; zoet water demersaal. Tropical
Africa: known only from Grotte de Vitane, a sinkhole near the town of Itampolo, Madagascar (Ref. 93144).
Grootte / Gewicht / Leeftijd
Maturity: Lm ? range ? - ? cm
Max length : 4.4 cm SL mannelijk / geslacht onbekend; (Ref. 93144)
Korte beschrijving
Morfologie | Morfometrie
Dorsale stekels (totaal): 5; Dorsale zachte stralen (totaal): 8; Anale stekels 0; Anale zachte stralen: 8; Wervels: 26. Diagnosis: This species is characterized by uniformly dark brown pigmentation throughout the body, and extending onto the fins for 1/3 of their length; only the distal 2/3 of each fin lacks pigment, apart from the dorsal fins, which are dark brown (Ref. 93144). In addition, Typhleotris mararybe can be distinguished from congeners by the presence of prominent and protruding anterior skeletal elements: protruding lateral ethmoid, sphenotic, and pterotic projections, in combination with a strongly sunken and concave orbital region, lend the head a sculpted and angled bony appearance, particularly in dorsal view; a shorter pectoral fin not reaching a vertical through the anus when adpressed; and an elevated vertebral count (Ref. 93144). It is further distinguished from T. madagascariensis by the absence of scales fully covering the head and a longer second predorsal length (64.9-69.0% of standard length vs. 56.2-64.1% of standard length); and from T. pauliani by a shorter prepelvic length (33.0-33.9% of standard length vs. 34.1-40.4% of standard length), a pelvic formula of I,5, and the absence of a single leading spine in both the second dorsal and anal fins (Ref. 93144).
Blind, cave-dwelling species; the known habitat, Grotte de Vitane, is a karst formation with nearly vertical walls, whose water level at the time of collection was approximately 10-15 m below the rim; the diameter of the sinkhole was approximately 100 m across at its widest, and 70 m at its narrowest, with more or less shear walls; the heigth of the sinkhole walls to the water level was approximately 50 m on its southern end, and much shallower on the northern end (Ref. 93144). The water was relatively clear, deep, and warm, about 7.5-10 m deep on average; occurs in open water within 1–1.5 m of the surface; upon being chased, all individuals immediately dove toward the bottom (Ref. 93144).
Levenscyclus en paargedrag
Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven
Sparks, J.S. and P. Chakrabarty, 2012. Revision of the endemic Malagasy Cavefish genus Typhleotris (Teleostei: Gobiiformes: Milyeringidae), with discussion of its phylogenetic placement and description of a new species. American Museum Novitates 3764:1-28. (Ref. 93144)
Status op de Rode Lijst van het IUCN (Ref. 130435)
Gevaar voor de mens
Harmless
Gebruik door de mens
Visserij:
Meer informatie
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Estimates based on models
Fylogenetische diversiteitsindex (Ref.
82804): PD
50 = 0.6250 [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).
Trofisch niveau (Ref.
69278): 3.2 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
