Erik Norman Kjellesvig-Waering

Name: Eurypterids of the Devonian Holland Quarry Shale of Ohio
Author: Erik Norman Kjellesvig-Waering

Eurypterids of the Devonian Holland Quarry Shale of Ohio (1961)

Summary

“Eurypterids of the Devonian Holland Quarry Shale of Ohio”, published in 1961, is a work by Erik Norman Kjellesvig-Waering. It explores elements such as eurypterids, prosoma and teeth.

Quotes from Eurypterids of the Devonian Holland Quarry Shale of Ohio (Erik Norman Kjellesvig-Waering)

Erik Norman Kjellesvig-Waering, Eurypterids of the Devonian Holland Quarry Shale of Ohio (1961)

“ In contrast to these active swimmers, the associated eurypterids, namely, Dolichopterus asperatus and Syntomopterus richardsoni, had simple, small chelicerae not serviceable as weapons of either defense or predation; both were probably benthonic forms, crawling on the mud but perhaps capable of swimming to a limited extent. These could well have been prey to the fishes and, indeed, to the large pterygotids. However, in this shale the fishes are the only animals with a covering rigid and hard enough to abrade the tough pincer-teeth of the pterygotids. ”

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Source: Wikisource

Erik Norman Kjellesvig-Waering, Eurypterids of the Devonian Holland Quarry Shale of Ohio (1961)

“ Besides the common fishes and eurypterids, no animal remains are present. It is difficult to explain the intimate association of fishes and eurypterids not only in this black shale but also throughout the Silurian and Devonian sections other than by the conclusion that one served as prey for the other. In the Ohio Devonian, the pterygotids surpassed five feet in length (from the anterior of the carapace to the end of the telson) and were armed with stout and formidable chelicerae which, with their strong teeth, served as excellent grasping organs. ”

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Source: Wikisource

Erik Norman Kjellesvig-Waering, Eurypterids of the Devonian Holland Quarry Shale of Ohio (1961)

“ However, part of the general stout aspect is inherent. The majority of the teeth are small, with several large, thick teeth interspersed. The central, or principal, tooth of the free ramus (no. 1 in figs. 35–38) is the largest, and is represented by a curved, thick structure. Nearly opposite this tooth is a similar but smaller tooth (no. 3) . In front of this tooth is another one, half as large (no. 4) . This combination is present on all chelicerae of this species. ”

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Source: Wikisource

Erik Norman Kjellesvig-Waering, Eurypterids of the Devonian Holland Quarry Shale of Ohio (1961)

“ Family Stylonuridae Diener, 1924
Genus Syntomopterus, new genus
The prosoma is paraboloidal, very wide, straight along the base, and bordered with a wide marginal rim. The ventral shield is very narrow and band-like, and without sutures. The compound eyes, located slightly behind midsection, are crescentic, small, and close-set. The ocellar mound is located opposite the anterior part of the compound eyes. Ornamentation comprises large wart-like pustules, elongated and pointed at the margins.
Type species: Syntomopterus richardsoni, new species. ”

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Source: Wikisource

Erik Norman Kjellesvig-Waering, Eurypterids of the Devonian Holland Quarry Shale of Ohio (1961)

“ In particular, there is no basis for comparison with the eurypterids of the Lower Devonian Beartooth Butte (listed above as "Wyoming") , as each species is quite different. The same is true of a comparison with the Lower Devonian of the Rhineland, Germany (Størmer, 1936) . The Ohio Lower Devonian eurypterid fauna retains such Silurian elements as Erettopterus and Dolichopterus, two genera previously unknown above the Silurian. Pterygotus (Pterygotus) carmani likewise shows closer relationship to Silurian than to Devonian forms. ”

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Source: Wikisource

Erik Norman Kjellesvig-Waering, Eurypterids of the Devonian Holland Quarry Shale of Ohio (1961)

“ This marginal rim is composed of a single row of flat, oblong, elevated structures (see fig. 44, a) ; it is narrow at the genal angles and is not developed on the posterior edge. Apart from this ornamented rim, the prosoma is smooth.
The compound eyes are not preserved except for the barely perceptible anterior margin of the left eye and a slight elevation that
may represent the eye node. The node is probably arcuate, and the palpebral lobe covers most of the eye. The prosoma measures 69 mm. in length, 79 mm. in width behind the compound eyes, and 99 mm. ”

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Source: Wikisource

Erik Norman Kjellesvig-Waering, Eurypterids of the Devonian Holland Quarry Shale of Ohio (1961)

“ The inner margin, armed with teeth, is inclined with respect to the almost straight outer margin, resulting in an overall tapering form. The teeth are short and stout, in keeping with the overall robust aspect of the stem. These teeth are mostly of fairly uniform size, mainly lanceolate to rhomboidal, but some are truncated, giving a nearly quadrate appearance. The two distal teeth are badly worn but apparently were the largest. Wear is also apparent on the succeeding three teeth. No longitudinal ridges ("striations") occur on any of the teeth. ”

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Source: Wikisource

Erik Norman Kjellesvig-Waering, Eurypterids of the Devonian Holland Quarry Shale of Ohio (1961)

“ The species is based on a single well-preserved, complete, free ramus of the chelicera. Inward bowing at the distal end indicates that it is the free ramus of the left chelicera. The specimen is broken through the midsection into two parts. ”

Erik Norman Kjellesvig-Waering

Summary

Quotes from Eurypterids of the Devonian Holland Quarry Shale of Ohio (Erik Norman Kjellesvig-Waering)

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