Search found 387 matches

by Rico Morgenstern
Sat Dec 07, 2013 12:59 pm
Forum: Central American Cichlids
Topic: American cichlids Evolution
Replies: 14
Views: 3934

Re: American cichlids Evolution

While the book could certainly never compete with Ad's high standard popular and scientific puplications about Lake Malawi and Tanganyika cichlids, it must be born in mind that it was published almost a quater century ago. It is a little too simple to say the author was wrong with the knowledge of n...
by Rico Morgenstern
Wed Oct 09, 2013 1:58 pm
Forum: Taxonomy
Topic: New Australoheros
Replies: 4
Views: 2194

Re: New Australoheros

Thanks, Willem, for enlighting this, and for your insightful graphics. Looks like the vertebral count, which was thought to diagnose a species group within the genus, is rather an artifact from different methodology. Which, in itself, does not say anything about the status of the many new species. A...
by Rico Morgenstern
Wed Oct 09, 2013 1:42 pm
Forum: Taxonomy
Topic: Temporal Patterns of Diversification across Global Cichlid..
Replies: 1
Views: 1153

Re: Temporal Patterns of Diversification across Global Cichl

Thanks Bojan, interesting work. It is, however, beond me why trained zoologists do that carelessly use scientific names which have never been properly established ("Pelmatochromini", "Hemichromini") or are not even based on true generic names ("Boreochromini", "Australotilapiini", these are obviousl...
by Rico Morgenstern
Sat Oct 05, 2013 11:08 am
Forum: Taxonomy
Topic: New Apistogramma
Replies: 6
Views: 1846

Re: New Apistogramma

The holotype and some paratypes of Heroina isonycterina stem from that collection.
by Rico Morgenstern
Sat Oct 05, 2013 2:22 am
Forum: Taxonomy
Topic: Which clade should be named?
Replies: 19
Views: 5994

Re: Which clade should be named?

I do not believe in 'cryptic species' distinguished by genetic characters only. In cases of sympatry, it is not detectable if the genetic differences do correlate with 'functional species', and in allopatry the differences may just reflect some genetic drift. Anyway, regardless if genetic, biochemic...
by Rico Morgenstern
Sat Oct 05, 2013 1:19 am
Forum: Taxonomy
Topic: Provisional names
Replies: 8
Views: 2418

Re: Provisional names

I agree Matt. In some cases it is certainly useful to have different different strains of a species denoted by their origin or something else, since many species show geographic variation, and line-bred forms should also be clearly indicated as such. But where different forms are 'invented' or names...
by Rico Morgenstern
Fri Oct 04, 2013 6:34 am
Forum: Taxonomy
Topic: Provisional names
Replies: 8
Views: 2418

Re: Provisional names

This is an other problem without answer (IMO) for the time beeing. Usually ther woud be only ONE valid name a a species, but, sometimes scientists don't agree with each other. See the Maylandia/Metriaclima problem or the des cription of local varieties of Australoheros.. Usually, the rules for scie...
by Rico Morgenstern
Mon Sep 30, 2013 1:34 pm
Forum: Taxonomy
Topic: Provisional names
Replies: 8
Views: 2418

Re: Provisional names

No there are no rules. It would of course be desirable to have only one name per species/local form but it isn't the case. Where you can select between two or more names, you may use what you find most appropriate. If determinable, I would recommend to chose the name which is most widely used.
by Rico Morgenstern
Fri Sep 27, 2013 10:08 am
Forum: Central American Cichlids
Topic: P. Motaguensis and R. Octofasciata
Replies: 3
Views: 1225

Re: P. Motaguensis and R. Octofasciata

Both species are known to occur in the Rio Motagua system in Guatemala. They have been recorded already by N. Miller (1907, albeit under wrong names) from several localities within the system, at some places they were taken together. Both may also coexist in the Rio Ulua drainage in Honduras, though...
by Rico Morgenstern
Sat Sep 14, 2013 2:38 am
Forum: South American Cichlids
Topic: Andinoacara pulchra - Aren't They a Bit Young For This???
Replies: 1
Views: 835

Re: Andinoacara pulchra - Aren't They a Bit Young For This??

Very nice, thanks for sharing. I have almost forgotten how beautiful Blue Acaras can look, for the fishes of our old aquarium strains are usually very pale and somewhat deformed. Do you know where your fish have been caught?
by Rico Morgenstern
Fri Sep 13, 2013 10:03 am
Forum: Central American Cichlids
Topic: Mexique 2012
Replies: 2
Views: 1060

Re: Mexique 2012

The link didn't work until I noticed that the 'h' of 'http' was missing :wink:

http://www.youtube.com/watch?v=SFkcGP6IwmI

Nice video, I hope to see more!
by Rico Morgenstern
Mon Sep 09, 2013 1:14 pm
Forum: Taxonomy
Topic: To be or not to (apart)?
Replies: 92
Views: 18695

Re: To be or not to (apart)?

Hi Willem. You did a great job. Thanks a lot. The drawing explained the stuff perfectly. I agree with you 100%. I couldn't agree more. Well done, Willem. It has often been said that the Code deals with nomenclature only: "the naming of taxa". In this regard it is a bit confusing to read in the Code...
by Rico Morgenstern
Sun Sep 08, 2013 8:10 am
Forum: Taxonomy
Topic: Cryptoheros and Australoheros - a Common Ancestor?
Replies: 36
Views: 7897

Re: Cryptoheros and Australoheros - a Common Ancestor?

Still, the oldest divergence (between kaaygua and angiru) is dated at 4.8-6.8 mya Willem I cannot help thinking that we get our wires crossed here, so forgive me if I misunderstand you. But the oldest divergence within a clade must be the most basal split. And in the case of Australoheros , this is...
by Rico Morgenstern
Sun Sep 08, 2013 3:06 am
Forum: Taxonomy
Topic: To be or not to (apart)?
Replies: 92
Views: 18695

Re: To be or not to (apart)?

Well, I think, that we do not need types in taxonomy. These are (just) a proof. Since even the holotype does not necessarily possess the characters which are constitute the species taxon, and - more curious - that the holotype does not even need to be member of the species taxon it seems clear that...
by Rico Morgenstern
Mon Sep 02, 2013 2:47 pm
Forum: Taxonomy
Topic: Cryptoheros and Australoheros - a Common Ancestor?
Replies: 36
Views: 7897

Re: Cryptoheros and Australoheros - a Common Ancestor?

According to Rican et al. (2011) the divergence of Australoheros ykeregua and Australoheros forquilha (the most ancient split in the group, studied in that paper) was caused by the barrier we now know as the Salto Moconá and correpsonds roughly to 2.3 and 3.3 mya. In Rican et al. (2012) diversifica...
by Rico Morgenstern
Mon Sep 02, 2013 11:19 am
Forum: Taxonomy
Topic: To be or not to (apart)?
Replies: 92
Views: 18695

Re: To be or not to (apart)?

"Potentially" in this article refers to the entire scope of the Code, not just to types in the species group. In fact, every nominal species group taxon has a name bearing type (Art. 72.4.1 and 72.4.1.1.), whether it is extant or not. I don't have read the 'orginal description' of Nessie (there are ...
by Rico Morgenstern
Fri Aug 30, 2013 2:38 pm
Forum: Taxonomy
Topic: Cryptoheros and Australoheros - a Common Ancestor?
Replies: 36
Views: 7897

Re: Cryptoheros and Australoheros - a Common Ancestor?

Would Gymnogeophagus fit the bill? Maybe also the Poecilids and unusual livebearers (e.g. Jenysia, Goodeids) found in Central America...and Uruguay? Poeciliid biogeography is certainly predestinated for comparision with that of CAM cichlids. There are indeed some poeciliid genera with a distributio...
by Rico Morgenstern
Mon Aug 26, 2013 12:18 pm
Forum: Taxonomy
Topic: Cryptoheros and Australoheros - a Common Ancestor?
Replies: 36
Views: 7897

Re: Cryptoheros and Australoheros - a Common Ancestor?

Thank you, Mike. The plates alone are already quite informative, and the book is present in my local library, so I will soon take the opportunity to read it.
by Rico Morgenstern
Mon Aug 26, 2013 10:20 am
Forum: Taxonomy
Topic: Cryptoheros and Australoheros - a Common Ancestor?
Replies: 36
Views: 7897

Re: Cryptoheros and Australoheros - a Common Ancestor?

Just to avoid misunderstandings, I do not find this procedure (i.e. changing generic assignments according to tree topologies without comment) appropriate whatsoever. Indeed I regard it as an annoyance; and otherwise interesting and valuable works like the two mentioned suffer a little from that.
by Rico Morgenstern
Sun Aug 25, 2013 7:10 am
Forum: Taxonomy
Topic: Cryptoheros and Australoheros - a Common Ancestor?
Replies: 36
Views: 7897

Re: Cryptoheros and Australoheros - a Common Ancestor?

Actually, Rocio has been treated as synonym of Astatheros (through inclusion of the type species, R. octofasciata in that genus) by Lopez-Fernandez & al. (2010). And Rican & al. (2012) place Archocentrus spinosissimus whithin Rocio . Fortunately, the famous name of the describer has saved Heroina fr...

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