Chudo humanistica, Korshunova & Fletcher & Martynov, 2025

Korshunova, Tatiana, Fletcher, Karin & Martynov, Alexander, 2025, The endless forms are the most differentiated-how taxonomic pseudo-optimization masked natural diversity and evolution: the nudibranch case, Zoological Journal of the Linnean Society 204 (4) : -

publication ID

https://doi.org/10.1093/zoolinnean/zlaf057

publication LSID

lsid:zoobank.org:pub:D09886E-5D7C-40D1-B86A-118A3ADE5773

persistent identifier

https://treatment.plazi.org/id/03EF87FE-FF93-FFF3-FEF2-FEEBFC15FDAE

treatment provided by

Plazi

scientific name

Chudo humanistica
status

gen. et sp. nov.

Chudo humanistica gen. et sp. nov.

( Fig. 6) urn:lsid:zoobank.org:act:

Etymology: See above after the new family diagnosis.

Holotype: KM883 , L = 46 mm (preserved), Southern Ocean , subantarctic waters, R / V ‘ Akademik Mstislav Keldysh ’, cruise 79, sta. 6604, 61.1059 S 49.6952 W, 26 January 2020, depth 2800 m. GoogleMaps

Description

External morphology ( Fig. 6A–C) Body very wide. Notal edge is completely reduced, dorsal part of the body smoothly transits to the sides. Rhinophores strong, smooth to slightly wrinkled, no less than two times longer than oral tentacles (in preserved state). Head is broad. Dorso-lateral parts of body bear very distinct, broadly elongated areas of the ceratal attachments, corresponding to the digestive gland branches, and appear as rather unbranched, but thick and ‘compounded’ rows. In total up to about seven ceratal rows, from which four to five possibly represent the anterior digestive gland. Dorsal cerata almost completely fallen off during collection, only one or two relatively thin cerata are preserved. Anal opening mixed—pleuroproctic in a higher cleioproctic position, but placed in almost a posterior extreme of the right lateral side. Foot broad with anterior ‘bilabiate’ furrow and evident anterior foot corners.

Colour Live colour was unrecorded before fixation, in fixed state colour whitish to light brownish.

Jaws ( Fig. 6D, E) Jaws massive, somewhat squarish in general outline, yellowish in colour. The masticatory edges smooth.

Radula ( Fig. 6F–M) Triserial radula is remarkable with very massive lateral teeth, whose bases broader than bases of somewhat posteriorly square and more anteriorly triangular central teeth. Radula formula up to at least 37 × 1.1.1. Both central and lateral teeth bear numerous fold-like, partly clustered denticles. No less than up to 30 denticles on the central teeth, and up to 35 denticles on inner edge of the lateral teeth. Cusp of central teeth strong, massive, triangular, to considerably pointed, some cusps not clearly delineated from lateral denticles. The denticles on the lateral teeth placed mostly on the inner edge, but outer edges may bear some serration or weak denticulation.

Reproductive system ( Fig. 6O) Hermaphroditic duct leads to long, swollen, moderately wide convoluted ampulla. Vas deferens long, convoluted,prostate non-distinct, although prostatic region can be partly recognized. Supplementary gland absent. Oviduct connects through the insemination duct into the female gland complex. Vas deferens with no detectable penis within a penial sheath and oviduct opens in a common atrium open below approximately the 3rd to 4th ceratal rows. Receptaculum seminis relatively small, oval in a distal position, almost sessile, on a very short stalk.

Ecology: Deep-sea taxon, discovered at a depth of 2800 m.

Distribution: So far discovered only from the subantarctic location in the Southern Ocean.

Remarks: The COI minimal uncorrected p -distance of 11.2% was found between the Chudo humanistica gen. et sp. nov. and Microchlamylla amabilis . The COI maximal uncorrected p -distance of 23.6% was found between the C. humanistica gen. et sp. nov. and Glaucilla marginata . See above after the new family diagnosis.

R

Departamento de Geologia, Universidad de Chile

V

Royal British Columbia Museum - Herbarium

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Nudibranchia

Family

Cumanotidae

Genus

Chudo

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