Myrella Odhner 1963

• Main Authors: Silva, Felipe De Vasconcelos, Pola, Marta, Cervera, Juan Lucas
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2023
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Gastropoda; Nudibranchia; Tritoniidae; Myrella; Antarc*; Antarctic; Antarctica
• Online Access: https://doi.org/10.5281/zenodo.8432417; http://treatment.plazi.org/id/03A6878CFF856502FD43FD0CED08FAE5

Myrella Odhner1963 (Fig. 3G) Microlophus Mabille and Rochebrune 1889, non- Microlophus Duméril and Bibron 1837 Type species: Myrella challengeriana (Bergh 1884) comb. nov. (= Myrella poirieri Mabille and Rochebrune 1889), by original designation. Diagnosis: Tricuspid rachidian tooth with minor folds. Masticatory borders denticulate with conical denticles. Penis thin, oħen conical at the distal end and flagelliform towards proximal end. Morphology: Body broad, length up to 80 mm (Fig. 3G). Oral veil broad, bilobed or entire. Five to 20 simple or branched velar processes. Notal border distinct. Six to 40 pairs of fully arborescent gills. Rachidian tooth tricuspid, denticulate (minor folds) with rectangular base. First lateral tooth differentiated. Masticatory borders of jaws denticulate with medium-sized (up to 50 µm) denticles with conical bases and sharp cusps. Ratio jaw/body length: 0.21–0.4. Cuticular folds absent. Gonopore at end of one-third of body length, furthest from rhinophores. Anus at middle of body length; nephroproct above anus. Ampulla cylindrical and coiled. Penis thin and flagelliform or conical at the distal end and flagelliform towards proximal end. Capsule and mucous gland distinct. Species composition: Myrella antarctica (Pfeffer in Martens and Pfeffer 1886) comb. nov. , Myrella australis (Bergh 1898) comb. nov. , Myrella challengeriana (Bergh 1884) comb. nov. , Myrella dantarti (Ballesteros and Avila 2006) comb. nov. and Myrella vorax (Odhner 1926) comb. nov. Remarks: Based on our phylogenetic analyses, the clade formed by the Antarctic ‘ Tritonia ’ challengeriana and the sub-Antarctic ‘ Tritonia ’ dantarti corresponds to a distinct genus, molecularly and morphologically different from Tritonia s . s . This group, first depicted in Korshunova and Martynov (2020) and further focused in Moles et al . (2021), corresponds to the resurrected Myrella Odhner 1963, based on the type species My. challengeriana . The species included in this group are characterized by a unique combination of features ...