Alvinonemertes tatjanae, Sagorny & Döhren & Rouse & Tilic, 2022

Sagorny, Christina, Döhren, Jörn von, Rouse, Greg W. & Tilic, Ekin, 2022, Cutting the ribbon: bathyal Nemertea from seeps along the Costa Rica margin, with descriptions of 2 new genera and 9 new species, European Journal of Taxonomy 845 (1), pp. 132-174 : 158-159

Alvinonemertes tatjanae gen. et sp. nov.

urn:lsid:zoobank.org:act:B3C2ABC6-34E6-497C-9A66-023A5751DC78

Fig. 8H

Diagnosis

Alvinonemertes tatjanae gen. et sp. nov. can be attributed to the genus Alvinonemertes gen. nov. based on the strong support for a sister group relationship between the five species of this genus.

Etymology

For Tatjana Bartz, lab technician at the Institute of Evolutionary Biology, University of Bonn. Acknowledging her support in the electron microscopy lab over many years. Tatjana has trained the last author in specimen preparation for transmission electron microscopy, for which he will ever be grateful.

Material examined

Holotype USA • spec. (ethanol); Hydrate Ridge , Oregon margin; 44.670° N, 125.098° W; depth ca 618 m; 3 Aug. 2010; Victoria Orphan and José Patterson leg.; collected by HOV Alvin, Dive 4631; GenBank: ON186256 , ON036047 , ON021864 , ON182041 ; SIO-BIC N119.

Description

Specimens 7–9 mm long and 0.7 mm in diameter. Body rounded. One pair of cephalic furrows. Head not demarcated from rest of body, rounded. Body pale red to pinkish with several red pigment spots distributed over body surface. Gonads and gut well visible through body wall ( Fig. 8H ).

Remarks

Alvinonemertes tatjanae gen. et sp. nov. is attributed to the genus Alvinonemertes gen. nov. based on the executed phylogenetic analyses. In the concatenated analysis, it is sister to the clade comprising A. christianeae gen. et sp. nov. and A. claudiae gen. et sp. nov. ( Fig. 7 ).

Figures

Fig. 8. Live images of eumonostiliferous hoplonemerteans collected along the Costa Rica margin and the NE Pacific. A. Chernyshevia escarpiaphila sp. nov., paratype (SIO-BIC N112). B. Chernyshevia escarpiaphila sp. nov., paratype (SIO-BIC N266). C. Octocoral Paragorgia sp. (SIO-BIC Co3054) with several specimens of Alvinonemertes dariae sp. nov., holotype (arrows; ex SIO-BIC N262). D. Alvinonemertesdariaesp.nov.,holotype(exSIO-BICN262).E.Antipathariancoral(SIO-BICCo3031) with specimens of Alvinonemertes dagmarae sp. nov., holotype (SIO-BIC N260). F. Alvinonemertes christianeae sp. nov., holotype (SIO-BIC N253). G. Alvinonemertes claudiae sp. nov., holotype (ex SIO-BIC N231). H. Alvinonemertes tatjanae sp. nov., holotype (SIO-BIC N119). I. Eumonostilifera (SIO-BIC N259). J–L. Tetrastemma sundbergi sp. nov., holotype (SIO-BIC N256) whole animal (J), dorsal view of head (K), and ventral view of head (L). M. Tetrastemma polyakovae sp. nov. (MZUCR Nemertea Collection MZUCR-101-01).N. Tetrastemma polyakovae sp. nov., holotype (SIO-BIC N258), with everted proboscis. O. Eumonostilifera (SIO-BIC N109).

Fig. 7. Maximum likelihood (ML) tree for the monostiliferan supermatrix based on the concatenated four gene dataset (16S, COI, 18S, H3). Black circles indicate nodal support of 100/100/1.0; asterisks indicate nodal support of either 100/ or /1.0. Alternative branches found in the BI analysis are given as blue dotted lines. Sonnenemertes cantelli Chernyshev, Abukawa & Kajihara, 2015 and Micrura callima Sundberg & Gibson, 1995 were used for outgroup rooting. Specimens belonging to new species are given in bold. Specimen-ID, sampling locality, and depth (for deep-sea species) are provided.