taxonID	type	description	language	source
03E48791FF8DA50BFD8D2F3C4E23DED4.taxon	description	Fig. 2	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8DA50BFD8D2F3C4E23DED4.taxon	diagnosis	Diagnosis (from Korn & Ebbighausen, 2006, emended here) Species of Goniatites with a conch reaching a diameter of 70 mm. Conch globular to spindle-shaped at 20 mm diameter (ww / dm 0.90 – 1.10), pachyconic to globular at 40 mm diameter (ww / dm 0.70 – 0.90) and pachyconic at 60 mm diameter (ww / dm 0.65 – 0.75). Umbilicus very narrow in all stages larger than 20 mm dm (uw / dm 0.05 – 0.15). Shell ornament with crenulated, biconvex and rursiradiate growth lines with prominent dorsolateral projection. External sinus very shallow. Suture line with a moderately narrow external lobe (0.40 – 0.45 of the external lobe depth) and a low median saddle (0.25 – 0.35 of the external lobe depth).	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8DA50BFD8D2F3C4E23DED4.taxon	materials_examined	Type material Holotype MOROCCO – Anti-Atlas • Gara el Itima locality GI-J; Zrigat Formation, horizon GI- 1 (Late Viséan); 2004; Ebbighausen and Korn leg.; MB. C. 9084.1; illustrated by Korn & Ebbighausen (in Klug et al. 2006: text-fig. 20 a – b). Paratypes MOROCCO – Anti-Atlas • 71 specs; same data as for the holotype; 2004; Ebbighausen and Korn leg.; MB. C. 9084.2 to MB. C. 9084.72. Other material examined MOROCCO – Anti-Atlas • 11 specs; Gara el Itima, near locality GI-J; 31 ° 02.747 ′ N, 3 ° 42.429 ′ W; Zrigat Formation, horizon GI- 1 (Late Viséan); 2007; Korn et al. leg.; MB. C. 32197.1 to MB. C. 32197.11.	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8DA50BFD8D2F3C4E23DED4.taxon	description	Description All the newly available specimens are fragments, with MB. C. 32197.1 being the best preserved (Fig. 2 A). It is from a specimen with a conch diameter of 44 mm, which is spherical and very narrowly umbilicate at this ontogenetic stage (ww / dm = 0.95; uw / dm = 0.11). The suture line has a very narrow, V-shaped external lobe with almost straight flanks. The external lobe, the ventrolateral saddle and the adventive lobe are approximately equally wide; the adventive lobe displays weakly sinuous flanks (Fig. 2 B).	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8DA50BFD8D2F3C4E23DED4.taxon	discussion	Remarks (from Korn & Ebbighausen in Klug et al. 2006) A comparison of Goniatites rodioni with the other species of the genus that lack spiral ornament is rather easy. Goniatites sphaericus (Sowerby, 1814) has a similar conch, but differs in the much higher median saddle (0.45 of the external lobe depth) from G. rodioni (0.25). Goniatites crenistria Phillips, 1836 has, unlike G. rodioni, growth lines that run with almost linear course across flanks and venter. In this respect, G. hudsoni Bisat, 1934 and G. americanus Gordon, 1971 resemble G. rodioni, but these species differ in the suture line: G. rodioni has a very narrow external lobe, which is narrower than the adventive lobe than the other two. Furthermore, the growth lines in G. rodioni show a much higher dorsolateral projection.	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8BA50BFD9C2A034B71DC68.taxon	discussion	Remarks Ruzhencev & Bogoslovskaya (1971: 330) were uncertain about the origin of the family Ferganoceratidae (translated from Russian): “ The origin of the family is not entirely clear. Apparently, the genus Ferganoceras is related to Neoglyphioceras, because the conch shape and the general character of the suture line are similar. ” The possible ancestry of these forms is discussed below.	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8BA50AFDC12B2E4EB0D9EE.taxon	description	urn: lsid: zoobank. org: act: 134 ED 820 - 9 F 3 E- 4524 - 83 DC-E 6 D 6154 E 7845	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8BA50AFDC12B2E4EB0D9EE.taxon	type_taxon	Type species Xenoglyphioceras eidos gen. et sp. nov.	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8BA50AFDC12B2E4EB0D9EE.taxon	diagnosis	Diagnosis Genus of the family Ferganoceratidae with a discoidal conch. Shell ornament with dense spiral lines. Adult stage with constrictions that bend forward in the ventrolateral area to continue in a single longitudinal groove.	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8BA50AFDC12B2E4EB0D9EE.taxon	etymology	Etymology Combination of the Greek ‘ ξεΝΟΣ ’ = ‘ strange’ and Glyphioceras Hyatt, 1884 (neuter).	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8BA50AFDC12B2E4EB0D9EE.taxon	discussion	Remarks The new genus Xenoglyphioceras gen. nov. occupies a morphological position between the genera Beyrichoceras Foord, 1903 and Ferganoceras Librovitch, 1957, meaning that it combines a thickly discoidal conch with a shell ornamentation composed of delicate spiral lines and a shape of the venter that is bordered by deep longitudinal grooves. At first glance, this may seem surprising, particularly as these two genera have distinctly different stratigraphic positions. Beyrichoceras is known from an interval ranging from the Entogonites nasutus Zone to the Goniatites crenistria Zone in the Rhenish Mountains, and from the B 1 Zone to the P 1 a Zone in northern England. In Lancashire and Derbyshire, Beyrichoceras is particularly species-rich in the B 2 Zone, where it is found alongside Goniatites hudsoni (Bisat 1934; Korn & Tilsley 2006). In contrast, Ferganoceras is known from considerably younger strata (Ruzhencev & Bogoslovskaya 1971), specifically from the Viséan-Serpukhovian boundary interval (Hypergoniatites – Ferganoceras genus zone). The genus, first described based on material from Fergana (Uzbekistan) by Librovitch (1957), is one of the most important components of the ammonoid assemblages in the southern Urals (Ruzhencev & Bogoslovskaya 1971). The genus Ruddelites Malinky & Mapes, 1982, described based on material from Arkansas (Malinky & Mapes 1982), is likely a junior synonym of Ferganoceras. To date, Ferganoceras is known from the Anti-Atlas by only a single species, F. torridum Korn & Ebbighausen, 2006, represented by just one specimen (Klug et al. 2006). The new genus is characterised by the peculiarity that in its middle ontogenetic stage, it resembles typical representatives of Beyrichoceras, but in its adult stage, it develops a morphology more similar to Ferganoceras. This can be seen as a case of hypermorphosis in Xenoglyphioceras gen. nov. The ventrolateral grooves typical of Ferganoceras, which appear at a relatively small conch diameter of about 8 mm (Ruzhencev & Bogoslovskaya 1971), do not develop in Xenoglyphioceras until the end of ontogeny, when the conch diameter reaches about 50 – 60 mm. This raises the question of whether some of the species described from the British Isles or Central Europe and attributed to Beyrichoceras might actually belong to Xenoglyphioceras gen. nov. However, most of these species have been described from relatively small specimens, usually with diameters of less than 50 mm (Bisat 1934; Korn & Tilsley 2006). It is worth noting that larger specimens of Beyrichoceras from these regions have been rarely reported. Beyrichoceras mempeli Schmidt, 1941, with a conch diameter of 60 mm, is an exception (Schmidt 1941; Korn 2006). Unlike Xenoglyphioceras, the type specimen at this size shows no evidence of ventrolateral longitudinal grooves. The hypothetical evolutionary scenario suggested by this new discovery can be explained through alternating processes of heterochrony (e. g., McNamara 1986; McKinney 1990). The ancestral form, Beyrichoceras, does not yet exhibit a specific adult morphology that fundamentally differs from earlier ontogenetic stages. Through hypermorphosis, Xenoglyphioceras gen. nov. adds an additional stage at the end of ontogeny, characterised by sharply forward-directed constrictions in the ventrolateral area, which develop into ventrolateral longitudinal grooves. In a subsequent step, these features are shifted to an earlier ontogenetic stage in Ferganoceras through acceleration. This new discovery also prompts a reconsideration of the systematic classification of the family Ferganoceratidae. This family was placed in the superfamily ‘ Neoglyphiocerataceae’ by Ruzhencev & Bogoslovskaya (1971). However, this classification may now be questioned, or it might only be upheld if Neoglyphioceras and similar genera could also be derived from Beyrichoceras and Xenoglyphioceras gen. nov. The origin of the Neoglyphioceratoidea remains unresolved. The superfamily appeared suddenly with its oldest known species, Neoglyphioceras spirale (Phillips, 1841), in the Neoglyphioceras spirale Zone (P 1 d of the British zonation). No species that could be considered a direct ancestor has yet been identified. With its unusually slender conch geometry and prominent spiral lines, N. spirale is an anomaly in the Neoglyphioceras spirale Zone and cannot be phylogenetically linked to any stratigraphically older species. It is possible that Xenoglyphioceras gen. nov. is the ancestor of Neoglyphioceras. However, this would require significant modifications to the conch (whorls becoming more slender) and ornamentation (reduction in the number of spiral lines). The suture line of Xenoglyphioceras differs less markedly from that of Neoglyphioceras. Both genera share similarities in the shape of the external lobe and the ventrolateral saddle.	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8AA507FDA52EAB4EF2DA20.taxon	description	urn: lsid: zoobank. org: act: 9 E 318 F 16 - BB 75 - 4 DCA-B 078 - 51384494 F 14 B Figs 3 – 4; Table 1	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8AA507FDA52EAB4EF2DA20.taxon	diagnosis	Diagnosis Species of Xenoglyphioceras gen. nov. with a conch reaching a diameter of 80 mm. Conch thickly discoidal and involute at 30 mm diameter (ww / dm ~ 0.55; uw / dm ~ 0.10) and thinly discoidal and subinvolute at 60 mm diameter (ww / dm ~ 0.40; uw / dm ~ 0.20). Shell ornament with dense spiral lines and biconvex growth lines. Adult stage with constrictions that bend forward in the ventrolateral area to continue in longitudinal grooves. Suture line with a moderately wide external lobe (0.60 – 0.65 of the external lobe depth) and a moderately low median saddle (0.35 – 0.40 of the external lobe depth).	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8AA507FDA52EAB4EF2DA20.taxon	etymology	Etymology From the Greek ‘ τὸ εἶΔΟΣ ’ (noun in apposition) = ‘ the beauty’; because of the combination of morphological characters.	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8AA507FDA52EAB4EF2DA20.taxon	materials_examined	Type material Holotype MOROCCO – Anti-Atlas • Gara el Itima, near locality GI-J; 31 ° 02.747 ′ N, 3 ° 42.429 ′ W; Zrigat Formation, horizon GI- 1 (Late Viséan); 2007; Korn et al. leg.; MB. C. 32198.1; illustrated in Fig. 3 A. Paratypes MOROCCO – Anti-Atlas • 11 specs; same data as for the holotype; MB. C. 32198.2 to MB. C. 32198.12.	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8AA507FDA52EAB4EF2DA20.taxon	description	Description Holotype MB. C. 32198.1 is an almost completely chambered internal mould with a conch diameter of 61 mm (Fig. 3 A). Less than a quarter of a volution belongs to the incomplete body chamber. The conch is thinly discoidal and subinvolute (ww / dm = 0.38; uw / dm = 0.20). It should be noted that the umbilicus opens rather clearly on the last volution of the phragmocone. The whorl profile is weakly compressed (ww / wh = 0.93) with a uniformly rounded venter that merges into the slightly convex, weakly convergent flanks via a broadly rounded ventrolateral shoulder. The umbilical margin is subangular and separates the flank from the flattened, almost vertical umbilical wall. The coiling rate is very low (WER = 1.48). The surface of the internal mould appears to be completely smooth, although traces of very fine spiral lines can be seen in some small areas. The last volution shows five shallow constrictions, which are arranged at somewhat irregular distances from one another. They have a weakly biconvex course with very low dorsolateral and ventrolateral projections and a very deep ventral sinus. The last of the constrictions differs in its course from the others in that the ventrolateral projection is very prominent. It cannot be said if the constrictions and grooves were also present on the shell surface or if the just represent internal shell thickenings. The suture line has a V-shaped external lobe with clearly sinuous flanks; the median saddle reaches a height of 0.36 the depth of the external lobe. The ventrolateral saddle is somewhat asymmetrical and bluntly rounded; the adventitious lobe is almost symmetrical with convex flanks (Fig. 4 A). Paratype MB. C. 32198.2 is a completely chambered internal mould specimen with a conch diameter of 38 mm (Fig. 3 B). The conch is thickly discoidal and involute (ww / dm = 0.49; uw / dm = 0.13). The umbilicus opens only slowly on the last volution of the phragmocone. The whorl profile is weakly depressed (ww / wh = 1.06) with a uniformly rounded venter that merges into the slightly convex, weakly convergent flanks via a broadly rounded ventrolateral shoulder. The umbilical margin is narrowly rounded. The last volution has three shallow constrictions, which are very weakly biconvex course with very low dorsolateral and ventrolateral projections and a deep, semicircular ventral sinus. The suture line (Fig. 4 B) is similar to that of the holotype. Paratype MB. C. 32198.3 is a body chamber fragment of an approximately 75 mm large specimen (Fig. 3 D). At a shell diameter of 55 mm, it already displays distinctly pronounced ventrolateral grooves, accompanied by clearly biconvex radial constrictions. Between these constrictions, very faint plications can be recognised on the flanks. As with the holotype, it cannot be determined whether the constrictions and ventrolateral grooves seen on the internal mould are also present on the shell surface, or if they represent internal thickenings of the shell. The paratypes MB. C. 32198.4 (Fig. 3 C) and MB. C. 32198.5, like paratype MB. C. 32198.3, are fragments of the adult body chamber. Both show the characteristic constrictions and grooves. Both exhibit the impression of the shell of the penultimate whorl in the inner part of the body chamber. It is evident that the primary element of the shell ornamentation consists of very fine, closely spaced spiral lines. The shell surface of the penultimate whorl shows no constrictions or grooves.	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF8AA507FDA52EAB4EF2DA20.taxon	discussion	Remarks Xenoglyphioceras eidos gen. et sp. nov. resembles species of Beyrichoceras in the late juvenile and preadult ontogenetic stages but differs significantly in the adult stage due to the prominent constrictions and ventrolateral grooves.	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF87A506FDB92E234A14DCBD.taxon	discussion	Remarks The co-occurrence of Merocanites and Goniatites has likely not been previously reported. Species of Merocanites are commonly found alongside much older ammonoid genera such as Ammonellipsites Parkinson, 1822 and Muensteroceras Hyatt, 1884 at the Tournaisian-Viséan boundary or slightly younger strata. They are particularly well known from Ireland (Foord 1900), northern England (Riley 1996), Belgium (de Koninck 1880), the Rhenish Mountains and the Harz (Holzapfel 1889; Schindewolf 1951; Korn 2006), the Cantabrian Mountains (Kullmann 1963), the Montagne Noire (Böhm 1935; Korn & Feist 2007), the Holy Cross Mountains in Poland (Dzik 1997), the Tien Shan in Kyrgyzstan (Popov 1968) and the Mouydir in Algeria (Ebbighausen et al. 2010). Another unusual fact is the remarkable size of the material from Gara el Itima. Specimen MB. C. 32199.2 is a fragment of a phragmocone with a whorl height of over 70 mm. This suggests that the conch, including the body chamber, had a diameter of approximately 360 mm. Large specimens of Merocanites have so far been known from early Viséan strata. Holzapfel (1889: pl. 5) illustrated a specimen of “ Prolecanites ceratitoides von Buch ” (= Merocanites applanatus Frech, 1899) nearly 200 mm in size and mentioned even larger specimens (Holzapfel 1889: 44). This material originates from the ‘ Erdbach Limestone’ of the Kramberg near Erdbach in the Rhenish Mountains. Based on conodonts, this rock can be assigned to the early Viséan (Krebs 1968). Pareyn (1961: pl. 6) illustrated a specimen of Merocanites ogivalis Pareyn, 1961 with a phragmocone diameter of nearly 200 mm, belonging to a conch with a diameter of almost 400 mm. This specimen came from the ‘ Série de Mazzer-Akacha’ in the Saoura Valley of western Algeria. This assemblage can also be placed in the late Viséan based on the conodont fauna (Nemyrovska et al. 2006: 364). In contrast, the representatives of Merocanites from the Tournaisian-Viséan boundary are often smaller. Merocanites merocanites Ebbighausen, Korn & Bockwinkel, 2010 from the Dalle à Merocanites of Timimoun in Algeria reaches a conch diameter 70 mm (Ebbighausen et al. 2010: 199), M. djaprakensis Librovitch, 1927 attains 120 mm (Popov 1968: 79) and M. applanatus from the ‘ Erdbach Limestone’ of the Harz reaches a conch diameter about 150 mm (Korn 2006: 155). An exception is Merocanites quadrilobus Riley, 1996 from the Leagram Mudstone Member; the holotype has a phragmocone whorl height of 52 mm, corresponding to a total conch diameter of more than 250 mm (Riley 1996).	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF86A504FDDD2C1A4CBCDC43.taxon	description	urn: lsid: zoobank. org: act: 15 FA 1 A 69 - 02 FA- 458 B- 9 EDC- 8877 AC 2 C 147 C Fig. 5; Table 2	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF86A504FDDD2C1A4CBCDC43.taxon	diagnosis	Diagnosis Species of Merocanites with a strongly applanate whorl cross section (ww / wh ~ 0.60 at 90 mm conch diameter); flanks flattened and subparallel and separated from the rounded venter by a rounded ventrolateral shoulder; umbilical margin rounded. Suture line with a small, V-shaped external lobe; three lobes present on the flanks, the adventive lobe is asymmetric with a steep dorsal flank, followed by the lateral lobe and the second umbilical lobe, which closely resemble each other. Width of the lateral lobe 0.26 – 0.28 of its depth.	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF86A504FDDD2C1A4CBCDC43.taxon	etymology	Etymology After the Latin ‘ consequius ’ (adj. masc.) = ‘ following’, because of the late occurrence of the species.	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF86A504FDDD2C1A4CBCDC43.taxon	materials_examined	Type material Holotype MOROCCO – Anti-Atlas • Gara el Itima, near locality GI-J; 31 ° 02.747 ′ N, 3 ° 42.429 ′ W; Zrigat Formation, horizon GI- 1 (Late Viséan); 2007; Korn et al. leg.; MB. C. 32199.1; illustrated in Fig. 5 B. Paratypes MOROCCO – Anti-Atlas • 3 specs; same data as for the holotype; MB. C. 32199.2 to MB. C. 32199.4.	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF86A504FDDD2C1A4CBCDC43.taxon	description	Description Holotype MB. C. 32199.1 is the fragment of a phragmocone with a whorl height of 31 mm (Fig. 5 B), which leads to a reconstructed phragmocone diameter of about 90 mm (Table 2). The ww / wh ratio is nearly 0.60. The whorl profile shows a semicircular venter, almost parallel and flattened flanks, a rounded umbilical margin and convex umbilical wall. The whorl embraces very little of the previous one. The suture line has a small, V-shaped external lobe that is only half as deep as the three lobes on the flank (Fig. 5 C). The outer of these three lobes, the adventive lobe, is asymmetrical with a strongly curved ventral and an almost vertical dorsal flank. Two more, almost identical lobes follow on the flank. Both are very narrow and deep; they are slightly wider than the neighbouring saddles. These lobes are slightly pouched and the saddles appear slightly inflated. On the umbilical wall there is another, short and V-shaped lobe. The internal lobe has parallel walls and is very narrow and very deep with nearly parallel flanks. The larger paratype MB. C. 32199.2 (71 mm wh) is also a fragment of the phragmocone and shows the same morphology as the holotype (Fig. 5 A). The suture line is almost identical to that of the holotype.	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
03E48791FF86A504FDDD2C1A4CBCDC43.taxon	discussion	Remarks All species of Merocanites possess similar conch shapes, but differences can be recognised in the whorl profile, the width of the umbilicus and the suture line. It is important to note that the suture line changes during ontogeny, with the lobes on the flank becoming increasingly symmetrical and narrower during ontogeny. Any comparison of species must take this into account. A potential phylogenetic trend may also be discernible, with younger species displaying narrower lobes compared to older ones. Merocanites consequius belongs to those species that already exhibit very narrow lobes at a relatively early ontogenetic stage, with a whorl height of 30 mm. The lateral lobe has a width-to-depth ratio of 0.26, compared to approximately 0.30 in M. quadrilobus. A similar suture line to M. consequius can be found in M. ogivalis, but this species differs from M. consequius by having a significantly narrower umbilicus (uw / dm = 0.32) than M. consequius (uw / dm> 0.40).	en	Korn, Dieter (2025): A new Late Viséan ammonoid assemblage from the Anti-Atlas (Early Carboniferous, Morocco). European Journal of Taxonomy 987: 249-263, DOI: 10.5852/ejt.2025.987.2873, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2873/13049
