PMID- 22471800
OWN - NLM
STAT- MEDLINE
DCOM- 20120614
LR  - 20120404
IS  - 1095-8649 (Electronic)
IS  - 0022-1112 (Linking)
VI  - 80
IP  - 4
DP  - 2012 Apr
TI  - Gymnotus capanema, a new species of electric knife fish (Gymnotiformes, 
      Gymnotidae) from eastern Amazonia, with comments on an unusual karyotype.
PG  - 802-15
LID - 10.1111/j.1095-8649.2012.03219.x [doi]
AB  - Gymnotus capanema n. sp. is described on the basis of cytogenetic, morphometric, 
      meristic and osteological data from nine specimens (one male and eight females) 
      from the municipality of Capanema, Para, in the eastern Amazon of Brazil. Later, 
      three additional specimens were found in museums and regarded as nontypes (not 
      cytogenetically analysed). Gymnotus capanema, which occurs in sympatry with 
      Gymnotus cf. carapo cytotype 2n = 42 (30m/sm + 12st/a) exhibits a novel karyotype 
      for the genus, with 2n = 34 (20m/sm + 14st/a). Gymnotus capanema can be 
      unambiguously diagnosed from all congeners on the basis of a combination of 
      characters from external anatomy, pigmentation and osteology. The constitutive 
      heterochromatin, rich in adenine-thymine (A-T) base pairs [4',6 
      diamidino-2-phenylindole dihydrochloride (DAPI) positive], occurs in the 
      centromeric region of all of the chromosomes, and in the pericentromeric and the 
      entire short arm of some chromosomes. The nucleolar organizing region (NOR), 
      stained by silver nitrate, chromomycin A(3) (CMA(3)) and 18S ribosomal (r)DNA 
      fluorescence in situ hybridization (FISH), occurs in the short arm of pair 15. 
      FISH, with telomeric probes did not show interstitial telomeric sequences (ITS), 
      despite the reduced 2n in comparison to the karyotypes of other species of 
      Gymnotus. The karyotype of G. capanema, with a reduced 2n, is strikingly 
      different from all other previously studied congeners.
CI  - (c) 2012 The Authors. Journal of Fish Biology (c) 2012 The Fisheries Society of the 
      British Isles.
FAU - Milhomem, S S R
AU  - Milhomem SS
AD  - Laboratorio de Citogenetica, Instituto de Ciencias Biologicas, Universidade 
      Federal do Para, Campus do Guama, Av. Perimetral, SN, Belem-PA 66075-900, Brazil.
FAU - Crampton, W G R
AU  - Crampton WG
FAU - Pieczarka, J C
AU  - Pieczarka JC
FAU - Shetka, G H
AU  - Shetka GH
FAU - Silva, D S
AU  - Silva DS
FAU - Nagamachi, C Y
AU  - Nagamachi CY
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PT  - Research Support, U.S. Gov't, Non-P.H.S.
DEP - 20120223
PL  - England
TA  - J Fish Biol
JT  - Journal of fish biology
JID - 0214055
RN  - 0 (RNA, Ribosomal, 18S)
SB  - IM
MH  - Animals
MH  - Brazil
MH  - Female
MH  - Gymnotiformes/anatomy & histology/*classification/*genetics
MH  - Karyotype
MH  - Male
MH  - RNA, Ribosomal, 18S/genetics
MH  - Species Specificity
EDAT- 2012/04/05 06:00
MHDA- 2012/06/15 06:00
CRDT- 2012/04/05 06:00
PHST- 2012/04/05 06:00 [entrez]
PHST- 2012/04/05 06:00 [pubmed]
PHST- 2012/06/15 06:00 [medline]
AID - 10.1111/j.1095-8649.2012.03219.x [doi]
PST - ppublish
SO  - J Fish Biol. 2012 Apr;80(4):802-15. doi: 10.1111/j.1095-8649.2012.03219.x. Epub 
      2012 Feb 23.