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Siluriformes (Catfishes) >
Heptapteridae (Three-barbeled catfishes)
Etymology: Rhamdia: Brazilian vernacular name, Nhamdia/Jamdia (Ref. 45335); guasarensis: Named for Río Guasare, parent stream of the subterranean waters in which this endemic catfish species lives.
Environment: milieu / climate zone / depth range / distribution range
بوم شناسي
; آب شيرين نزديك كف زي. Tropical
South America: Venezuela.
Size / Weight / سن
Maturity: Lm ? range ? - ? cm
Max length : 10.7 cm SL جنس نر / بدون خواص جنسي; (Ref. 80467)
توصيف مختصر
كليدهاي شناسايي | ريخت شناسي | ريخت ستجي بوسيله انداره گيري
خارهاي باله پشتي (کل) : 1; شعاع نرم باله پشتي (کل) : 6; شعاع نرم باله مخرجي: 12. This species differs from its congeners by having a concave dorsal head profile (vs. convex or straight); frontal bones broadly sutured to each other anterior to small, circular remnant foramen of anterior cranial fontanelle that is anteriorly adjacent to epiphyseal bar (vs. frontals separated by anterior fontanelle widely open from mesethmoid to epiphyseal bar). It differs from all epigean Rhamdia by the following troglomorphic characters: eyes absent, complete depigmentation, widened cutaneous pores of the cephalic laterosensory system, preoperculomandibular sensory canal forming wide fossae in the dentary and preopercle (vs. narrow pores and canals). Further, this species can be distinguished from other Rhamdia species by the following set of characters: pectoral fins with a spine and ten branched rays (vs. modally eight or nine soft rays in other species); both lobes of the caudal fin pointed (vs. at least one lobe rounded); caudal skeleton with three hypural plates, PH; 1 + 2; 3 + 4 + 5 (vs. Modally four PH; 1 + 2; 3 + 4; 5 in the other species, except R. laukidi and R. jequitinhonha) (Ref. 80467).
The cave where the fish was collected is near the margin of Río Guasare and is the source of a spring during seasonal rains; its lower conduit has a 280 m course, 2-3 m wide and 1-2 m high, narrowly communicating with the access gallery. The underground river is permanently fed by a spring about 60 m into the lower gallery. At the time the collection was made, the average depth of the water course was 1.5 m with deeper pools along its course where the catfishes were observed (Ref. 80467).
Life cycle and mating behavior
بلوغ | تولید مثل | تخم ریزی | تخم ها | Fecundity | توزاد ( لارو)
DoNascimiento, C., F. Provenzano and J.G. Lundberg, 2004. Rhamdia guasarensis (Siluriformes: Heptapteridae) a new species of cave catfish from the Sierra de Perija´, northwestern Venezuela. Proc. Biol. Soc. Wash. 117(4):564-574. (Ref. 80467)
وضعيت در فهرست قرمز IUCN (Ref. 130435: Version 2024-2)
خطر برای انسان ها
Harmless
استفاده انسانی
ماهي گيري – شيلات: از بی علاقه گی
ابزارها
گزارش های ويژه
بارگيری XML
منابع اينترنتي
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=0.00794 (0.00374 - 0.01688), b=2.97 (2.79 - 3.15), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Trophic level (Ref.
69278): 3.4 ±0.4 se; based on size and trophs of closest relatives
جهندگی (Ref.
120179): متوسط, كمينه زمان لازم براي دو برابر شدن جمعيت 4/1 – 4/4 سال (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
