Conotalopia sematensis Oyama 1942
Creators: name: Qi, Lu
name: Xu, Biyang
name: Kong, Lingfeng
name: Li, Qi
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Trochida
Trochidae
Conotalopia
Conotalopia sematensis

description: Conotalopia sematensis Oyama, 1942
Materials
Type status: Other material. Occurrence: catalogNumber: LSGB 20200608; recordedBy: Qi Lu; individualCount: 10; lifeStage: subadult; occurrenceID: 0D2C619C-7A59-56F1-816F-88E901CFB3B5; Taxon: scientificName: Conotalopia sematensis; kingdom: Animalia; phylum: Mollusca; class: Gastropoda; order: Vetigastropoda; family: Trochidae; genus: Conotalopia; specificEpithet: sematensis; taxonRank: species; scientificNameAuthorship: (Oyama, 1942); taxonomicStatus: accepted; Location: islandGroup: Nanji; island: Dalei; country: China; stateProvince: Zhejiang; locality: Nanji island National Nature Reserve, Dalei island; verbatimCoordinates: 27 ° 29.82 ' N 121 ° 06.17 ' E; georeferenceProtocol: label; Identification: identifiedBy: Qi Lu; dateIdentified: 2023
Type status: Other material. Occurrence: lifeStage: adult; preparations: fossil; associatedReferences: https://www.biodiversitylibrary.org/item/101787#page/118/mode/1up, Yokoyama, M. (1922). Fossils from the Upper Musashino of Kazusa and Shimosa. Journal of the College of Science, Imperial University of Tokyo. 44 (1): viii + 1-200.; occurrenceID: 504CC3F8-7EBC-5E9F-A5CF-127A977C3377; Taxon: scientificName: Solariella philippensis; kingdom: Animalia; phylum: Mollusca; class: Gastropoda; order: Vetigastropoda; family: Solariellidae; genus: Solariella; specificEpithet: philippensis; taxonRank: species; Location: country: Japan
Type status: Other material. Occurrence: preparations: whole animal; associatedReferences: https://www.marinespecies.org/aphia.php?p=taxdetails&id=732128, Higo, S., Callomon, P. & Goto, Y. (1999) Catalogue and Bibliography of the Marine Shell-Bearing Mollusca of Japan. Elle Scientific Publications, Yao, Japan, 749 pp.; occurrenceID: AD459A05-88FA-5967-96F3-0F1AC508C0A4; Taxon: scientificName: Conotalopia sematensis; kingdom: Animalia; phylum: Mollusca; class: Gastropoda; order: Vetigastropoda; family: Trochidae; genus: Conotalopia; specificEpithet: sematensis; taxonRank: species; scientificNameAuthorship: (Oyama, 1942); taxonomicStatus: accepted; Location: country: Japan
Description
Shell: (Fig. 1 A-E) small (1.5 mm ± 0.07 mm), low conical. Whorls exhibited irregular longitudinal bands alternating in colour between white and light yellow-brown or yellow-green (Fig. 1 A-C). Three whorls, surface entirely covered with dense axial growth line; each whorl sharply angulated at shoulder, slightly sloped zone above the shoulder, below very steep, flat or slightly convex; the other angle was situated near the lower suture (Fig. 1 D-F). Between these two angles, there were often one or two faint threads (Fig. 1 H). Protoconch dextral; surface with reticular sculpture; clear boundary between protoconch and secondary shell (Fig. 1 I). Suture obvious; five spiral ribs at the base. The umbilicus is open and deep; its margin is moderately angulated; and a cancellate sculpture is created by five spiral ribs and growth lines around the umbilicus. The aperture is simple and subcircular; the outer lip is thin with two corners; the inner lip is smooth; and one corner is at the bottom of the aperture.
Operculum: Horny, circular, yellowish, translucence, with a multispiral nucleus in the centre (Fig. 1 G).
Radula: The radula type is rhipidoglossan radula (15 + 4 + 1 + 4 + 15) (Fig. 1 J-L). The central teeth were spade-shaped, with smooth edges and no cusps. The lateral and marginal teeth formed closely-spaced rows at an angle of 45 ° on both sides of the central teeth in a symmetrical arrangement. Each row typically consisted of approximately four lateral teeth, with each lateral tooth having five small cusps (2 + 1 + 2). Additionally, each row typically included approximately 15 marginal teeth, with each marginal tooth featuring approximately seven small cusps (2-3 + 1 + 2 - 3). The apical teeth were the largest, with 2-3 denticles on each side.
Diagnosis
The shell surface was entirely covered by a dense axial growth line. Each whorl angulated at the shoulder, slightly carinated at the angle, slightly sloped above or below very steep, flat or slightly convex. There were often one or two fainter threads between the two angles.
Distribution
China (Zhejiang), Japan, Philippines, Australia.
description: Published as part of Qi, Lu, Xu, Biyang, Kong, Lingfeng & Li, Qi, 2024, First record of the genus Conotalopia Iredale, 1929 (Vetigastropoda, Trochidae) in China, pp. e 117114 in Biodiversity Data Journal 12 on page e117114, DOI: 10.3897/BDJ.12.e117114