New species of Spectracanthicus (Loricariidae)

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lfinley58
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New species of Spectracanthicus (Loricariidae)

Post by lfinley58 »

Chamon, C.C., Pereira, T.N.A., Mendonca, M.B. & Akama, A. 2018. New species of the genus Spectracanthicus (Loricariidae, Hypostominae, Ancistrini) from the Rio Javaés (Rio Araguaia basin), with a description of gross brain morphology. Journal of Fish Biology (2018). doi:10.1111/jfb.13526, available online at wileyonlinelibrary.com
Abstract:
A new species of Spectracanthicus is described from the Rio Javaés, Rio Araguaia basin. The new species is distinguished from its congeners (except Spectracanthicus immaculatus) by colour pattern: body dark grey to dark brown without dots or blotches (v. body colour with yellowish small dots in Spectracanthicus murinus, Spectracanthicus punctatissimus and Spectracanthicus tocantinensis and large white dots in Spectracanthicus zuanoni). It can be further distinguished from S. immaculatus by having thicker and less numerous teeth, with up to eight premaxillary and 20 dentary teeth (v. teeth thinner and more numerous with up to 22 premaxillary and 30 dentary teeth); dorsal and caudal fins without curved spines (v. dorsal and caudal fins with curved spines). Other osteological characters can also diagnose the new species from its congeners. In addition, a gross brain description and brief comments on the new species’ ecological habitat are given.

http://onlinelibrary.wiley.com/doi/10.1 ... .13526/pdf
[I have not seen the complete paper, but one internet source notes the species name as javae]
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Re: New species of Spectracanthicus (Loricariidae)

Post by Karsten S. »

Hi,

I have the paper, Spectracanthicus javae is correct.

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Re: New species of Spectracanthicus (Loricariidae)

Post by bekateen »

Is it an existing L-number?

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Re: New species of Spectracanthicus (Loricariidae)

Post by lfinley58 »

Karsten,

Thanks for the confirmation of the species name.

Lee
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Re: New species of Spectracanthicus (Loricariidae)

Post by Karsten S. »

Hi Eric,
bekateen wrote: Sat Jan 20, 2018 5:17 pm Is it an existing L-number?
as mentioned already in the abstract it's most similar to Spectracanthicus immaculatus.
I don't know any L number that would fit.

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Re: New species of Spectracanthicus (Loricariidae)

Post by bekateen »

Okay thanks Karsten. I'll create a new species entry in the CLOG.

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Re: New species of Spectracanthicus (Loricariidae)

Post by Jools »

There is a fair old chance it is, I'd need to see the locality info and see if it matches an over the several Spectracanthicus l-numbers.

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Re: New species of Spectracanthicus (Loricariidae)

Post by bekateen »

According to the paper, this fish comes from an area where commercial fishing for the aquarium trade is rare or absent. The authors write that they do not believe that S. javae is in the hobby yet.

Updating the key to the genus to include Spectracanthicus javae (significantly retooled from the original 2014 key to prioritize the more readily visible features):
bekateen wrote: Thu Aug 13, 2020 7:34 pm From the paper:
  • 1a. Body ground color dark grey or brown and without dots or spots..... 2
    • 1b. Body ground color dark grey or brown to black with white or yellowish dots or spots..... 3
  • 2a. Dorsal and caudal-fin spines elongated and curved; eyes smaller (orbital diameter 13.6-16.2% of HL); bar-shaped opercle; teeth finer and more numerous (up to 22 in the premaxilla, up to 30 in the dentary)..... Spectracanthicus immaculatus
    • 2b. Dorsal and caudal-fin spines shorter and straight or slightly curved; eyes larger (orbital diameter 15.8-21.8% of HL); sickle-shaped opercle; teeth thicker and fewer (up to 8 in the premaxilla, up to 20 in the dentary)..... Spectracanthicus javae
  • 3a. Body with large (similar to slightly larger eye diameter) white spots..... Spectracanthicus zuanoni
    • 3b. Body with small- to medium-sized (clearly smaller than eye diameter) yellow dots….. 4
  • 4a. Three anal-fin branched rays; triangle-shaped opercle lacking large eversible odontodes; body dark grey with small yellow dots..... Spectracanthicus murinus
    • 4b. Four anal-fin branched rays; bar-shaped opercle with large eversible odontodes; body dark brown to grey or black with pale/yellowish, small- to medium-sized dots..... 5
  • 5a. Dorsal profile of snout slightly pointed, few premaxillary and dentary teeth (5-8 and 8-16 respectively)..... Spectracanthicus tocantinensis
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