On <i>Climacograptus inuiti</i> sp. nov. and its Development

Cox, Ian

doi:10.1017/s0016756800091202

Cited by 19 publications

(8 citation statements)

References 2 publications

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“…jormosus Bulman). In biserial forms the proportion is about one quarter (Kraft 1926;Cox 1933;Walker 1953), but on monograptids, it is only about one twelfth (Walker 1953 and the writer's own observations on several species); the cauda is very difficult to discern on monograptids as the nema often breaks off at its base.…”

Section: Interpretation and Significance Of Growth Stagesmentioning

confidence: 92%

The development of Clonograptus tenellus and Adelograptus hunnebergensis

Hut

1974

LET

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1974 01 15: The development of C/orlograpltrs leridris and Addograplirs hir~r~lebergerr~is. I.e/haia, Vol. 7, pp. 79-92. 040. ISSN 0024-1 164. E m The development of Cloriograp/iis ier~elliis Linnarsson and Adelogrupirrs Irri~il~ebergerisis (Mobel-g) is described for the first time. The material comprises well-preserved isolated specimens from the Shincton (Tremadoc) Shales of Chcrme's Dingle and Lady Covert, neai-Leighton, Shropshire. Two new morphological terms, the cauda and the conus, have been introduced for the adequate description of the prosicula. This material demonstrates that the nema is a hollow tube with a passage into the apex of the prosicula, and an open growing end. The tcrm nematocaulus has been applied to the soft tissue which secreted the nema. The mode of development and the internal stolon system suggested by Bulman (1949) have been confitmed. Early growth stages of this material are compared with those of Rhabdopleirra conrpacla Hincks. Jarin E . H i t / / , Sedgwick Mrtsermi. Dowwirig Streel, Catttbridgc~. U . K . (Presetlr adtlress: 28 Rockfield Drive, ~,/arrilrrdrlo, Caerrrar~~ortshire, Wales), 5/11 April, 1973.LETHAT 7 (1Y74) nebergensis is difficult unless a large portion of the rhabdosome is available, and the differing branching patterns can be seen. C. tenellus can, however, be distinguished on the basis of older growth stages, that is, after the first crossing canal has developed; of these growth stages, about 60V0 are referable t o C. tenellus. As the present material comprises mainly early growth stages and distal fragments, only a small proportion of the total specimens can be identified positively.This study has concentrated on the detailed morphology and development available with isolated material; description of the gross morphology of the two species was adequately covered by Stubblefield (1929). Because of the difficulty in distinguishing C. tenellus from A . hunnebergensis in the present material, a general description applicable t o both species will be given. Ack,rowledgenzeri/s.-This work is the first stage in a project to investigate and evaluate the La2 fauna of Victoria, Australia, which is generally believed to be Upper Tremadoc age. Further investigation of the main components of the underlying (Lower Tremadoc) anisograptid faunas was clearly necessary, since there is no strictly comparable Upper Tremadoc fauna elsewhere. The project has been financed by a grant from N.E.R.C. which is gratefully acknowledged by the author and the senior investigator, Prof. 0. M. B. Bulman, under whose general supervision this work was done. sity of Cambridge, for their helpful suggestions and discussions. All specimens are deposited in the Sedgwick Musuem, Cambridge. O I I Iriver/ebrute Palueoritology V. Gruplolirhiriu with seetioris or1 Eriteroprreiis/ii orid Pterobrurichiu. (2nd Edition), I-XXXII, 163 pp. Geol. Soc. Amer. and Bulman, 0. M. B. 1972: A new Dic/yorieniti fauna Univ. Kansas.

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Section: Interpretation and Significance Of Growth Stagesmentioning

confidence: 92%

The development of Clonograptus tenellus and Adelograptus hunnebergensis

Hut

1974

LET

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“…452-464). The virgula supports described by Cox (1933) are possibly the thickened selvedges of the interthecal septa, the more fragile parts having been disrupted b:r the effervescence of the acid used in isolating the specimens. In the mature part of the rhabdosome, where sigmoid bending of the thecae is slight, the arrangement of the interthecal septa resembles that of Orthograptus gracilis (Bulman 1932, pl.…”

Section: Descriptionmentioning

confidence: 95%

“…In order to arrive at a correct identification, the available descriptions of members of the genera Diplograptus s.1. and Climacograptus were investigated, the information being obtained mainly from Bulman (1932Bulman ( , 1936Bulman ( , 1944, Kraft (1926), Cox (1933) and Elles & Wood (1901-18). This confirmed the resemblance of the thecae (with lappets on the lateral walls of the apertures) of the proximal ends of Diplograptus s.s., certain orthograptids (e.g.O.…”

Section: The Distinction Of Amplexo(]raptu8 From Climacograpi'u8mentioning

confidence: 99%

Graptolites from Anticosti Island

Barrass¹

1954

QJGS

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Summary In graptolite collection sent to Professor Lapworth near the end of the 19th century are some pieces of limestone from Anticosti Island, Canada. These form the basis of the present study, in which the structure and development of two new species of Amplexograptus and a species of Climacograptus are described from specimens preserved compressed and in relief. Much of the investigation was carried out using serial sections made with the Croft parallel grinder. The amplexograptids resemble Amplexograptus [ Climacograptus ] inuiti (Cox) but were not put into the genus Climacograptus because they possess characters relating them to Diplograptus s.l. , e.g, a high length ratio of the excavation, long interthecal septa sloping to the axis of the rhabdosome, and a sub-rectangular cross-section. The climacograptid features, e.g. a low length ratio of the excavation, interthecal septa parallel to the axis and a circular or nearly circular cross-section, are shown in Climacograptus aff. scalaris . Compressed specimens of Amplexograptus elongatus (which has very small mesial thecal flanges) show both amplexograptid and orthograptid views and an attempt is made to account for this. I. Introduction The material investigated consists of a few small pieces of limestone from Anticosti Island, Canada, included in a collection of graptolites sent to Professor Lapworth at Birmingham towards the end of the 19th century (Bulman 1950). The specimens figured here will be deposited, temporarily at least, with the Department of Geology, Birmingham University. The limestone is from the following three main localities (Twenhofel 1928, fig. 1.): Observation Cliff, North Shore; Macdonald's Cove

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“…Climacograptus inuiti was described by Cox (1933) from 450 ft (137 m) above the base of a thick limestone succession on Akpatok Island, Ungava Bay (Fig. 1).…”

Section: The Faunamentioning

confidence: 99%

Climacograptus typicalis typicalis and associated shelly fossils from Lake Waswanipi, Québec

Walters¹,

Sheehan²,

Lespérance³

1976

Can. J. Earth Sci.

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Graptolites have been recovered from limestones at Lake Waswanipi, Quebec, in an Ordovician outlier on the Precambrian Shield. These limestones were previously interpreted as Wilderness, Trenton, or Richmond in age. They are now assigned a middle Climacograptus spiniferus to C . pygmaeus Zone age, dating the transgression over this part of the shield. Associated megafossils, though poorly preserved, are described. Correlations are made with other graptolite-bearing carbonates in eastern and central North America. Des Graptolites ont t t e recueillis de calcaires d'un placage ordovicien sur le bouclier precambrien au Lac Waswanipi. Ces calcaires etaient auparavant consideres comme etant d'PgeWilderness, Trenton, ou Richmond. Nous les attribuons a la moitie superieure de la Zone a Clirnacograptus spiniferus jusqu'a la Zone C . pygmaeus. Cet Pge date la transgression ordovicienne dans cette region du bouclier. Les mkgafossiles associes aux Graptolites, quoique ma1 conserves, sont egalement dtcrits. Des correlations sont proposees avec d'autres carbonates contenant des Graptolites dans I'est et le centre de I'Amerique du Nord.

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On Climacograptus inuiti sp. nov. and its Development

Cited by 19 publications

References 2 publications

The development of Clonograptus tenellus and Adelograptus hunnebergensis

The development of Clonograptus tenellus and Adelograptus hunnebergensis

Graptolites from Anticosti Island

Climacograptus typicalis typicalis and associated shelly fossils from Lake Waswanipi, Québec

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