Myurella Hinds 1845
Creators: name: Fedosov, Alexander E
name: Malcolm, Gavin
name: Terryn, Yves
name: Gorson, Juliette
name: Modica, Maria Vittoria
name: Holford, Mandë
name: Puillandre, Nicolas
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Neogastropoda
Terebridae
Myurella

description: Genus <i>Myurella</i> Hinds, 1845 (Fig. 7 A–D) <i>Type species:</i> <i>Terebra affinis</i> Gray, 1834; SD, Cossmann (1896). <i>Synonyms</i>: <i>Clathroterebra</i> Oyama, 1961 (type species <i>Terebra fortunei</i> Deshayes, 1857; OD); <i>Decorihastula</i> Oyama, 1961 (type species <i>Terebra affinis</i> Gray, 1834; OD); <i>Terenolla</i> Iredale, 1929 (type species <i>Terebra pygmaea</i> Hinds, 1844; OD). <i>Definition:</i> Primarily defined based on phylogenetic analysis of Modica <i>etal.</i> (2019), comprising species in clade E1 of Modica <i>etal.</i> (2019) and additionally those that show shell morphology, anatomical or genetic characteristics closely comparable with <i>Myurella affinis</i> or any genetically proven member of the clade. <i>Diagnosis</i>: Diagnostic nucleotide combinations in Table 6. <i>Shell</i>: very small to medium-sized, with elongated, with high orthoconoid spire; sculpture of arcuate or undulating ribs, fine and narrow to flat and wide. <i>Anatomy</i>: Rhynchodeal introvert very large, proboscis, radula and venom gland absent, salivary glands and accessory proboscis structure present in few species. <i>Distribution:</i> Indo-Pacific; intertidal to upper bathyal depths. <i>Remarks</i>: In regard to shell morphology, four distinct groups can be recognized: <i>Myurella affinis</i> group. Shell medium-sized; axial sculpture of low, wide, flattened ribs; subsutural band with elongate nodules separated by punctations, which are also pronounced in interspaces between axial ribs. Similar species that were earlier classified in <i>Myurella</i>, but do not belong in the <i>T</i>. <i>affinis</i> clade (i.e. <i>M</i>. <i>undulata</i>, <i>M</i>. <i>columellaris</i> and <i>M</i>. <i>kilburni</i>) are here reclassified in the genus <i>Myurellopsis</i>. Typical <i>Myurella</i> species can be recognized by the lower axials and shallower interstices between them. Because of the overall flatter axials, the subsutural band is visually continuous in <i>Myurella</i>; on the contrary, in <i>Myurellopsis</i>, due to the more elevated ribs, the subsutural band is represented by a row of nodules. <i>Myurella pseudofortunei</i> group. Shell elongate, of variable size (17–60 mm), with very high, slender spire, evenly convex whorls, indistinct subsutural band and narrow, clearly arcuate axial ribs; interspaces with regular striae. Species of this group exhibit a very distinctive morphotype, which has little in common with other species here attributed to <i>Myurella</i>. Terebrids with this morphology were previously placed in the genus <i>Clathroterebra</i>; however, in the analysis of Modica <i>etal.</i> (2019), they formed several lineages unrelated to <i>Clathroterebra</i>; morphological differences between these lineages are still to be studied. <i>Myurella pygmaea</i> group. Shell small, <i>c.</i> 10 mm; convex spire profile, straight sides to whorls; very short, tapering siphonal canal. Axial sculpture of numerous fine oblique ribs; subsutural band and other spiral elements absent. The group includes one species, <i>M. pygmaea</i>, formerly classified in the monotypic genus <i>Terenolla</i>. The very small but rather solid, finely ribbed shell is easily recognizable among terebrids; its recognition is further aided by the pattern of flesh-colour background with contrasting dark brown spiral line just below the suture. <i>Myurella amoena</i> group. Shell medium-sized; sculptured with fine to strong ribs, subsutural band defined by line of punctuations, spiral sculpture of narrow grooves or cords. The species of this group form a well-supported clade and exhibit a shallow-water morphotype that was formerly classified in <i>Hastulopsis</i>. Similar deeper-water species are found in <i>Maculauger</i> n. gen., most of which can be recognized by having a row of large spots on the periphery. The other similar species remain within <i>Hastulopsis</i>, comprising a number of Indian Ocean and Japanese endemic species. Species of the <i>M. amoena</i> group have strong but narrow ribs that are notably stronger than spiral elements. In <i>Myurellopsis</i> the ribs are about as strong as in the <i>M. amoena</i> group, but are wider and rounded, with interstices narrower than the ribs. Both <i>Hastulopsis</i> and <i>Maculauger</i> comprise species with axial and spiral elements of comparable strength, resulting in a rather cancellate pattern, and a continuous subsutural band. <i>Included species:</i> <i>Myurella affinis</i> (Gray, 1834) 1; <i>M. amoena</i> (Deshayes, 1859) 1; <i>M. andamanica</i> (Melvill &amp; Sykes, 1898) 1 ∗; <i>M. bilineata</i> (Sprague, 2004) 1; <i>M. brunneobandata</i> (Malcolm &amp; Terryn, 2012) 1; <i>M. burchi</i> (Bratcher &amp; Cernohorsky, 1982) 1; <i>M. conspersa</i> (Hinds, 1844) 1; <i>M. dedonderi</i> (Terryn, 2003) 1; <i>M. eburnea</i> (Hinds, 1844) 1; <i>M. flavofasciata</i> (Pilsbry, 1921) 1; <i>M. fortunei</i> (Deshayes, 1857) 1; <i>M. mactanensis</i> (Bratcher &amp; Cernohorsky, 1982) 2; <i>M. mindanaoensis</i> (Aubry, 2008) 1; <i>M. multistriata</i> (Schepman, 1913) 1; <i>M. nebulosa</i> (G. B. Sowerby I, 1825) 1; <i>M. pertusa</i> (Born, 1778) 1; <i>M. picardali</i> (Aubry, 2011) 2; <i>M. pseudofortunei</i> (Aubry, 2008) 1; <i>M. pygmaea</i> (Hinds, 1844) 1 n. comb.; <i>M. russoi</i> (Aubry, 1991) 2; <i>M. suduirauti</i> (Terryn &amp; Conde, 2004) 2; <i>M. wellsilviae</i> (Aubry, 1994) 1.
description: Published as part of <i>Fedosov, Alexander E, Malcolm, Gavin, Terryn, Yves, Gorson, Juliette, Modica, Maria Vittoria, Holford, Mandë &amp; Puillandre, Nicolas, 2019, Phylogenetic classification of the family Terebridae (Neogastropoda: Conoidea), pp. 359-388 in Journal of Molluscan Studies The Malacological Society of London 85 (4)</i> on pages 14-15, DOI: 10.1093/mollus/eyz004, http://zenodo.org/record/4469844
description: {"references": ["COSSMANN, M. 1896. Essais de paleoconchologie comparee, Vol. 2. Author and Comptoir Geologique, Paris.", "OYAMA, K. 1961. On some new facts of the taxonomy of Terebridae. Venus, 21: 176 - 189.", "MODICA, M. V., GORSON, J., FEDOSOV, A. E., MALCOLM, G., TERRYN, Y., PUILLANDRE, N. &amp; HOLFORD, M. 2019. Macroevolutionary analyses suggest environmental factors, not venom apparatus, play key role in Terebridae marine snail diversification. Systematic Biology. DOI: https: // doi. org / 10.1093 / sysbio / syz 059."]}