Hyalorisia nanhaiensis Fassio, Bouchet & Oliverio, 2020
publication ID |
https://doi.org/ 10.1093/mollus/eyaa028 |
DOI |
https://doi.org/10.5281/zenodo.4465139 |
persistent identifier |
https://treatment.plazi.org/id/2E21878C-CD3E-DE59-3F05-F984FDBBCBC5 |
treatment provided by |
Donat |
scientific name |
Hyalorisia nanhaiensis Fassio, Bouchet & Oliverio |
status |
sp. nov. |
Hyalorisia nanhaiensis Fassio, Bouchet & Oliverio View in CoL new species
MOTU-6 ( Figs 3F View Figure 3 , 5B View Figure 5 , 7E, N View Figure 7 )
Type material: Holotype: S of Dongsha (=Pratas) Islands, South China Sea, ZHONGSHA 2015, Stn CP4162 , 20°33 N, 116°40 E, 528–540 m, MNHN-IM-2013-59534 (male). GoogleMaps
Material examined: Holotype and other material (MNHN-IM-2007-34793, MNHN-IM-2007-34796, MNHN-IM-2013-59496, MNHN-IM-2013-59697 and MNHN-IM-2013-61770).
Etymology: After the Chinese name for the South China Sea (‘Nanhai’), the general area of the type locality.
ZooBank registration: urn:lsid:zoobank.org:act:2F50B7B5-DF14-423F-B123-34B64BCB045C .
COI-based diagnosis: Six diagnostic (autapomorphic) positions in the alignment: 75(G), 263(C), 271(C), 322(G), 400(A) and 631(C).
Shell (data for holotype shown within parentheses): Size small to medium for the genus: length 4.16–9 (8.5) mm, width 3.12–6 (6) mm, height 1.6–3 (3) mm; thin, ellipsoidal, depressed; white shell surface with smooth yellowish periostracum; anterior margin rounded or gently angled; protoconch of 1–1.2 (1.2) whorls, diameter of nucleus 0.12– 0.24 (0.15) mm; teleoconch smooth except for distinct commarginal growth ridges; apertural margin thin, interior glossy white; lamella from wide to narrow, width 0.4–1.12 (0.83) mm.
Soft parts (ethanol preserved): Head completely whitish or grey at the base; cephalic tentacles completely whitish or grey from the base to half/two-thirds of the length; pseudoproboscis whitish; mantle completely whitish to black with whitish border.
Radula: Taenioglossate, 2-1-R-1-2; marginal teeth sickle shaped; internal marginals with few denticles on the inner edge; lateral teeth triangular, highly denticulated on both edges; rachidian tooth triangular, highly denticulated on both edges.
Host: Holotype (MNHN-IM-2013-59534) was attached to P. jeffreysii (MNHN-IM-2013-59533). Of the other specimens, two (MNHN-IM-2007-34796 and MNHN-IM-2013-59496) were found attached to P. jeffreysii (MNHN-IM-2007-34797 and MNHN-IM-201359495, respectively) and two (probably a female MNHN-IM-2013-59697 and a male MNHN-IM-2013-61770) attached to the same individual of a Propeamussium sp. (MNHN-IM-2013-61769).
Distribution: So far known only from the South China Sea and the Philippines, at depths of 358– 556 m.
Remarks: Hyalorisia nanhaiensis n. sp. was found syntopically with H. profunda n. sp. (MOTU-9) on the continental slope of the South China Sea (ZHONGSHA 2015: Stn CP4137).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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