A new Lower Jurassic ammonite genusKohaticeras from the Shinawari Formation, Kohat Tribal Belt, Pakistan

Fatmi, Ali Nasir; Hölder, Helmut

doi:10.1007/bf02988064

Cited by 5 publications

(5 citation statements)

References 3 publications

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“…Two species bear a ventral groove (char. 35); this type of ventral area is qualified as bicarinate unisuclate (Fatmi and H€ older, 1975). However, there are no real keels.…”

Section: Charactersmentioning

confidence: 97%

“…The reason for this incongruence is due to imprecise stratigraphic assignment of Kohaticeras. This genus was erected by Fatmi and H€ older (1975), which is the only publication citing it. First, they argue that the fossils may be reworked.…”

Section: Stratigraphic Consistencymentioning

confidence: 98%

“…However, the scarcity and imprecision of stratigraphic correlation concerning Indo-Malgach assemblages make the stratigraphic argument very weak. While describing Kohaticeras, Fatmi and H€ older (1975) suggested an origin from Bouleiceras. The monophyly of the subfamily Paroniceratinae is strongly supported by many transformations such as the acquisition of an involute and thick conch, the apparition of segment i0i1, and inflection point i2 that continues to migrate ventrally and the disappearance of i4.…”

Section: Arieticeratinae Sl: Node 116mentioning

confidence: 98%

“…This is well exemplified by the punctual ornamentation of some Bouleiceratidae. Kohaticeras rehmani Fatmi and H€ older, 1975 bears two rows of punctual ornaments: one ventrolateral and one ventral. B. nitescens also has two rows of tubercles: one dorsolateral and one ventrolateral.…”

Section: Homoplastic Charactersmentioning

confidence: 99%

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The phylogeny of Hildoceratidae (Cephalopoda, Ammonitida) resolved by an integrated coding scheme of the conch

2016

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Ammonite phylogeny has mainly been established based on a stratigraphic approach, with cladistics underconsidered. The main arguments against the use of cladistics are the supposed large amount of homoplasy and the small number of characters. Resolving the phylogeny of the Hildoceratidae (Early Jurassic) is especially challenging because of its large diversity and disparity. Many forms that have not been determined as closely related in previous studies exhibit very similar shapes. Moreover, some groups are morphologically very different, adding difficulties to building a unique coding scheme at a low taxonomic resolution (i.e. species). Here we propose an integrated coding scheme of the peristome shape and the ornamentation, allowing an increased level of comparison. The shape of the peristome is used as a new reference to locate ornamental features and propose new homology hypotheses. In total, 105 taxa have been analysed for 47 characters. We code continuous characters by their means and ranges AE one standard deviation. We test two weighting schemes: equal weights standardized by unit range and implied weighting with several concavity constants. This work has led to redefinition of the phylogenetic inclusivenesses of all the hildoceratid subfamilies. The new coding scheme based on peristome shapes provides the fewest homoplastic characters. The schemes appear promising to improve phylogenetic analyses in ammonoids as well as molluscs as a whole by creating a general coding framework.

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“…Two species bear a ventral groove (char. 35); this type of ventral area is qualified as bicarinate unisuclate (Fatmi and H€ older, 1975). However, there are no real keels.…”

Section: Charactersmentioning

confidence: 97%

Section: Stratigraphic Consistencymentioning

confidence: 98%

Section: Arieticeratinae Sl: Node 116mentioning

confidence: 98%

Section: Homoplastic Charactersmentioning

confidence: 99%

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The phylogeny of Hildoceratidae (Cephalopoda, Ammonitida) resolved by an integrated coding scheme of the conch

2016

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“…in Somalia (Chiocchini et al, 2002). In Pakistan, B. nitescens and another species B. chakdallaense Fatmi, 1972, have been recorded (Davies and Gardezi, 1965;Fatmi, 1972;Fatmi and Hö lder, 1975). Outside the Indo-Madagascan Area, Bouleiceras has been cited in the Western Tethys area in Portugal (Mouterde, 1953;Dubar and Mouterde, 1953;Mouterde and Rocha, 1981), in the Iberian Range in Spain (Geyer, 1965(Geyer, , 1971Behmel and Geyer, 1966;Bizon et al, 1966;Dubar et al, 1970;Mouterde, 1970Mouterde, , 1971Marin and Toulouse, 1972;Goy, 1974Goy, , 1975Herrero-Organero, 1986;Goy et al, 1988;Herrero Matesanz, 1995;Goy and Martínez, 1996;Martínez, 2017a) and in the Pre-Rif of Morocco (Faugè res, 1975).…”

Section: Introductionmentioning

confidence: 99%

Bouleiceras (Hildoceratidae, Ammonitina) from the lower Toarcian (Jurassic) of the Iberian Range (Spain): Taxonomy, stratigraphic distribution and insights on its dispersal

Martínez

Joral

2020

Geobios

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Lieber Herr HÖlder,

Knauff¹

1979

Paläontol. Z.

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A new Lower Jurassic ammonite genusKohaticeras from the Shinawari Formation, Kohat Tribal Belt, Pakistan

Cited by 5 publications

References 3 publications

The phylogeny of Hildoceratidae (Cephalopoda, Ammonitida) resolved by an integrated coding scheme of the conch

The phylogeny of Hildoceratidae (Cephalopoda, Ammonitida) resolved by an integrated coding scheme of the conch

Bouleiceras (Hildoceratidae, Ammonitina) from the lower Toarcian (Jurassic) of the Iberian Range (Spain): Taxonomy, stratigraphic distribution and insights on its dispersal

Lieber Herr HÖlder,

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