Search found 387 matches

by Rico Morgenstern
Tue Mar 27, 2018 1:25 am
Forum: Taxonomy
Topic: Crenicichla vaillanti and other French Guyana saxatiloide pikes
Replies: 12
Views: 3411

Re: Crenicichla vaillanti and other French Guyana saxatiloide pikes

Originally, C. vaillanti was differenciated from C. saxatilis by having smaller scales on nape and belly. Nobody has checked so far if this distinction holds, Ploeg's various papers are not very useful in this respect. Therefore it is only tentatively treated as valid in our catalog, especially for ...
by Rico Morgenstern
Wed Mar 21, 2018 12:56 pm
Forum: Taxonomy
Topic: Crenicichla vaillanti and other French Guyana saxatiloide pikes
Replies: 12
Views: 3411

Re: Crenicichla vaillanti and other French Guyana saxatiloide pikes

Recent taxonomic works on Crenicichla show that the genus is in good hands, so I am pretty confident that the issues discussed here will be resolved in the forseeable future.
by Rico Morgenstern
Sat Mar 17, 2018 7:51 am
Forum: Taxonomy
Topic: Crenicichla vaillanti and other French Guyana saxatiloide pikes
Replies: 12
Views: 3411

Re: Crenicichla vaillanti and other French Guyana saxatiloide pikes

I would rather say the former is the case. Judging from the high resolution photos available from the MNHM collection database, the lectotype shows the dorsal markings not well defined but obviously below the position that would be occupied by the light submarginal band. Unfortunately the taxonomy o...
by Rico Morgenstern
Wed Mar 14, 2018 10:45 am
Forum: Taxonomy
Topic: new Petrochromis species
Replies: 7
Views: 1882

Re: new Petrochromis species

Yes, that's good advice. So I assume the taxa are not available yet. I have provisionally added the names to the profiles in the site nonetheless Correct, they are not available (not published according to the criteria of the code). So we should not use the new names in our catalog until they are fo...
by Rico Morgenstern
Wed Mar 14, 2018 10:13 am
Forum: Taxonomy
Topic: Crenicichla vaillanti and other French Guyana saxatiloide pikes
Replies: 12
Views: 3411

Re: Crenicichla vaillanti and other French Guyana saxatiloide pikes

Is the splangling retained with conservation ? Such iridescent markings may or may not be retained. In specimens not fixed in formalin before alcohol preservation they are prone to fading, but if retained they may look almost as in life. I have seen specimens of Andinoacara collected around 1880, t...
by Rico Morgenstern
Sat Feb 10, 2018 12:36 am
Forum: Taxonomy
Topic: Redescription of Vieja hartwegi (Taylor & Miller 1980)
Replies: 11
Views: 2479

Re: Redescription of Vieja hartwegi (Taylor & Miller 1980)

I should perhaps have expressed this somewhat different. What I mean is that mtDNA is inherited by the mother only, therefore the hybrid bears the mtDNA of the maternal species. Consequently it would not be separable from that species in this respect.
by Rico Morgenstern
Fri Feb 02, 2018 4:49 am
Forum: Taxonomy
Topic: Redescription of Vieja hartwegi (Taylor & Miller 1980)
Replies: 11
Views: 2479

Re: Redescription of Vieja hartwegi (Taylor & Miller 1980)

All specimens fof the 'rheophilic morph' are from only three localities, two of them so close to each other (near a river confluence) that the specimens from both could well stem from a single hybridation event.
by Rico Morgenstern
Thu Feb 01, 2018 12:06 pm
Forum: Taxonomy
Topic: Redescription of Vieja hartwegi (Taylor & Miller 1980)
Replies: 11
Views: 2479

Re: Redescription of Vieja hartwegi (Taylor & Miller 1980)

The unusual 'rheophilic morph' maybe nothing but a natural hybrid between V. hartwegi and C. grammodes . Such hybrids have occurred in aquarium (Buchhauser 1999) and looked much the same. The possibility that it is a hybrid has not been considered in the paper. The differences between 'normal' V. ha...
by Rico Morgenstern
Thu Apr 06, 2017 3:51 pm
Forum: South American Cichlids
Topic: Differences in Geophagus
Replies: 2
Views: 1338

Re: Differences in Geophagus

You are right that they are quite distinct from Geophagus in the strict sense. The 'G'. crassilabris group ( crassilabris , pellegrini and steindachneri ) is closely related (sister group) to them acording to recent phylogenetic studies, but may well deserve separate generic status based on morpholo...
by Rico Morgenstern
Wed Apr 05, 2017 10:15 am
Forum: South American Cichlids
Topic: geophagus sp.alto sinu
Replies: 1
Views: 1595

Re: geophagus sp.alto sinu

You are right it is member of the same species group (undescribed genus) than 'G.' pellegrini . Within this group, it is closest to 'G.' steindachneri . Probably (judging from the few photos I have seen) it is just a geographic variant of that species, which has been recorded from Río Sinú basin in ...
by Rico Morgenstern
Sun Jan 15, 2017 1:37 pm
Forum: South American Cichlids
Topic: Bujurquina from Meta - Colombia ?
Replies: 1
Views: 1231

Re: Bujurquina from Meta - Colombia ?

Doesn't look like Bujurquina . Species of this genus (the only known representative in Río Meta is B. mariae ) have a longituninal band running to the posterior dorsal fin base or upper margin of caudal peduncle, but never towards the caudal spot. I would also rule out that it is Andinoacara cf. pul...
by Rico Morgenstern
Sun Oct 02, 2016 4:01 am
Forum: Taxonomy
Topic: Nine New Genera of Central and South American Cichlids Described
Replies: 28
Views: 6391

Re: Nine New Genera of Central and South American Cichlids Described

My criticism relates the number of genera proposed since many monotypic genera were described. Monotypic genera blur (to the general public) the relationship existent between different taxa. The generic classification by Říčan & al. (2016) is largely consequent (and consistent) in reflecting both p...
by Rico Morgenstern
Sun Oct 02, 2016 2:04 am
Forum: Taxonomy
Topic: Nine New Genera of Central and South American Cichlids Described
Replies: 28
Views: 6391

Re: Nine New Genera of Central and South American Cichlids Described

Both Talamancaheros sieboldii and T. underwoodi have the same fry coloration. The distinction is based on considerable genetic divergence. In the last species level revision (Bussing 1975) they have been considered conspecific. I think little is gained from recognizing 'cryptic species' separable at...
by Rico Morgenstern
Sat Sep 17, 2016 12:57 am
Forum: Taxonomy
Topic: Revision of the Pseudotropheus elongatus species group
Replies: 14
Views: 6897

Re: Revision of the Pseudotropheus elongatus species group

The interrelationships within the L. Malawi species flocks are certainly far too complex and too close to get a useful molecular phylogeny, at least with the available methods. This may change in the future, but at present there is no other choice than delimitation of genera by morphology only. And ...
by Rico Morgenstern
Wed Sep 07, 2016 4:39 am
Forum: Taxonomy
Topic: Nine New Genera of Central and South American Cichlids Described
Replies: 28
Views: 6391

Re: Nine New Genera of Central and South American Cichlids Described

The issue has been discussed in the German hobby literature, where some authors questioned the synonymy of the two species or suggested to retain synspila at least as a 'Variety'. They have argued mostly with differences in life colors. We can certainly all agree that there are obvious differences b...
by Rico Morgenstern
Fri Aug 26, 2016 11:46 pm
Forum: Taxonomy
Topic: 5 New Metriaclima Species
Replies: 71
Views: 20208

Re: 5 New Metriaclima Species

I'm not familiar enough with Mbuna to judge (or even to have an opinion) whether a synonymy of Maylandia and Metriaclima with Cynotilapia is justified, but this would definitely solve (or circumvent) the problem. However, for the time being it is still there; and it seems that we have to live with i...
by Rico Morgenstern
Thu Jul 28, 2016 2:31 pm
Forum: South American Cichlids
Topic: Help with GTs
Replies: 3
Views: 1618

Re: Help with GTs

I'm not quite sure, but I think it could well be a pair - the slightly larger fish being the female. It has the orange fin margins somewhat narrower, and the blue head markings seem to be partly fused to plain areas.
by Rico Morgenstern
Sat May 14, 2016 12:47 am
Forum: Taxonomy
Topic: New Aequidens Described
Replies: 5
Views: 2168

Re: New Aequidens Described

The grammatical gender of Aequidens is masculine so the specific name must be corrected to superomaculat us . Thanks Mar, I cannot understand what would be the difference of this new species from Aequidens diadema I think the new species is closer to A. pallidus . It seems to indistinguishable from ...
by Rico Morgenstern
Thu Apr 21, 2016 9:29 am
Forum: Taxonomy
Topic: Nine New Genera of Central and South American Cichlids Described
Replies: 28
Views: 6391

Re: Nine New Genera of Central and South American Cichlids Described

I don't find it that surprizing. The similarities between the true Tomocichla species and Talamancaheros are only superficial, there is no derived character state that would definitely link them. A close relationship was proposed by the late William Bussing in 1975 based on similar shape, dentition ...
by Rico Morgenstern
Tue Apr 12, 2016 1:46 pm
Forum: Taxonomy
Topic: New Gymnogeophagus Species
Replies: 6
Views: 2103

Re: New Gymnogeophagus Species

Here in Germany, the new species is known in the hobby since 1977. It had been identified as Gymnogeophagus rhabdotus and was known under that name until the early 1990s. Since, it had been often mistaken for Gymnogeophagus meridionalis , but is also known as G. sp. 'Rosario II' or G. sp. 'Arco Iris'.

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