Gomphonchoporus Vergoossen, 1999

Burrow, Carole J., 2003, Earliest Devonian gnathostome microremains from central New South Wales (Australia), Geodiversitas 25 (2), pp. 273-288 : 282

publication ID

https://doi.org/ 10.5281/zenodo.5376020

persistent identifier

https://treatment.plazi.org/id/020087A6-324F-311A-FF43-FD8F4C3CFDA2

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Marcus

scientific name

Gomphonchoporus Vergoossen, 1999
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Genus Gomphonchoporus Vergoossen, 1999

TYPE SPECIES. — Gomphodus hoppei Gross, 1947 .

Gomphonchoporus hoppei ( Gross, 1947) HOLOTYPE. — Scale f 449 figured by Gross (1947: pl. 24, fig. 7) from a Late Silurian erratic boulder, north Germany. Vergoossen (1999b: pl. 4, figs 42-44) erected a neotype NNM 423034, from a Pridoli-aged erratic, Oosterhaule, northern Netherlands.

MATERIAL EXAMINED ( Table 1). — Two scales in sample C864, three scales including figured specimen MMMC 02563 ( Fig. 3F, G View FIG ) in C925, and two scales in Y4.

DESCRIPTION ( FIG. 3F, G View FIG )

These scales are up to 0.8 mm wide, relatively shallow, and wider than long. MMMC02563 ( Fig. 3F, G View FIG ) has numerous short, weak ridges along the anterior crown margin. The posterior part of the crown has broken off, creating concave postero-lateral edges ( Fig. 3G View FIG ), with no evidence preserved of a radial pore canal system. The neck is concave all round with “buttresses” on the posterior faces; the rounded base is shallow.

REMARKS

Vergoossen (1999b) erected the poracanthodidid genus Gomphonchoporus for scales which Gross (1947) had assigned to the ischnacanthidid genus Gomphonchus . Gross’ type material was from northern German erratic limestones (Pridoli), and the taxon has been recorded from Pridoli- Lochkovian deposits of the Baltic, northern Europe and Great Britain (Valiukevic˘ius 1998; Vergoossen 2000); Vergoossen (1999b) proposed a neotype (associated with a full range of variants) deriving from a Pridoli erratic collected from Oosterhaule, northern Netherlands. Gomphonchoporus hoppei has a relatively wide variety of scale forms, with some of the variants (particularly when poorly preserved) appearing indistinguishable to scales from R. porosus . Difficulty in separating scales of these taxa applies to Baltic samples comprising thousands of scales, as observed by Gross (1971) and Vergoossen (1999b), as well as to the small samples studied here.

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