Triassurella goederti Kiel &amp; Campbell &amp; Gaillard 2010, sp. nov.
Creators: name: Kiel, Steffen
name: Campbell, Kathleen A.
name: Gaillard, Christian
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Lepetellida
Scissurellidae
Triassurella

description: <i>Triassurella goederti</i> sp. nov. (Fig 1) <b>Diagnosis:</b> Strongly asymmetrical limpet-shaped shell with mainly spiral sculpture; slit positioned at whorl shoulder, slit margins not raised, and fused or nearly fused at aperture. <b>Holotype:</b> USNM 538733, 2.6 mm maximum diameter. <b>Paratypes:</b> USNM 538734, 3.5 mm maximum diameter; USNM 538735, 1.6 mm maximum diameter. <b>Type locality:</b> The Bear Creek seep site, California, USA, 39°03'14"N, 122°24'40" W; Crack Canyon formation of the Great Valley Group; Early Cretaceous, Valanginian (Kiel <i>et al.</i> 2008). <b>Description:</b> Shell of strongly asymmetrical limpet shape, little more than half a rapidly expanding whorl, sculpturemainly spiral; upper side of whorl slightly convex, spiral ornament stronger near coiling axis and shoulder than in central part of whorl; at aperture eight spirals near coiling axis, at least seven near shoulder; slit situated at whorl’s shoulder, starting after approximately a quarter whorl, reaching greatest width about 1/ 8 whorl before aperture in mature specimens, slit closed (fused) or nearly closed at aperture; outer and lower part of whorl convex, sculptured by at least 11 spirals of subequal strength and spacing. <b>Remarks:</b> The type species <i>Triassurella carnica</i> has the same general shape and also has spiral sculpture as <i>Triassurella goederti</i>, but the spirals are broader than in <i>Triassurella goederti</i> and the slit does not close at the aperture (Nützel and Geiger 2006). <i>Triassurella goederti</i> resembles <i>Sutilizona theca</i> in its shell shape and slit morphology, but differs from it by having mainly spiral sculpture; <i>Sutilizona theca</i> has mainly radial sculpture (McLean 1989). Also similar regarding shell shape and sculpture is <i>Temnocinclis euripes</i> McLean, 1989 from the Juan de Fuca Ridge vent fields but that species and genus has raised slit margins, which are lacking in <i>Triassurella goederti</i>, and <i>T</i>. <i>euripes</i> has a more elongate shell (McLean 1989). <b>Distribution:</b> Type locality only. <b>Etymology:</b> For James L. Goedert, Wauna, Washington, who collected and provided the specimens.
description: Published as part of <i>Kiel, Steffen, Campbell, Kathleen A. &amp; Gaillard, Christian, 2010, New and little known mollusks from ancient chemosynthetic environments, pp. 26-48 in Zootaxa 2390 (1)</i> on page 28, DOI: 10.11646/zootaxa.2390.1.2, http://zenodo.org/record/5305157
description: {"references": ["Nutzel A. &amp; Geiger D. L. (2006) A new scissurelloid genus and species (Mollusca, Gastropoda) from the Late Triassic Cassian Formation. Palaontologische Zeitschrift, 80, 277 - 283.", "McLean J. H. (1989) New slit-limpets (Scissurellacea and Fissurellacea) from hydrothermal vents. Part 1. Systematic descriptions and comparisons based on shell and radular characters. Contributions in Science, Natural History Museum of Los Angeles County, 407, 1 - 29."]}