Tetranemertes sp. ETP001

Cherneva, Irina, Ellison, Christina I., Zattara, Eduardo E., Norenburg, Jon L., Schwartz, Megan L., Junoy, Juan & Maslakova, Svetlana A., 2023, Seven new species of Tetranemertes Chernyshev, 1992 (Monostilifera, Hoplonemertea, Nemertea) from the Caribbean Sea, western Pacific, and Arabian Sea, and revision of the genus, ZooKeys 1181, pp. 167-200 : 167

Tetranemertes sp. ETP001

Fig. 9G

Remarks.

A single individual of this species (SMPP0632) was extracted by CE from coral rubble collected by Maycol Madrid on 20 Jan 2020 at Isla Pachequilla (8.67231, -79.0605) from a depth of 5 m using SCUBA. Posterior end of specimen was missing. Partial specimen was 4-5 mm long and ~ 0.3 mm wide. Body uniformly pink with colorless margins and a single mid-dorsal longitudinal stripe, which is light in color and iridescent, similar to that seen in the Caribbean species Tetranemertes bifrost sp. nov. described above, and begins just posterior to the cephalic lobe. Four rows of pre-cerebral ocelli, two on each side, orange-red in reflected light, large in relation to head compared to other eumonostiliferan nemerteans. Head wider than body, diamond-shaped. Stylets not observed. Although we do not have a morphological voucher to designate the holotype and thus formally describe this species, DNA sequences clearly differentiate it from all other species of Tetranemertes (Table 5 ). See Table 1 for accession numbers.

Figures

Figure 9. Tetranemertes arabica sp. nov. and Tetranemertes paulayi sp. nov. from the Arabian Sea (Oman), and Tetranemertes sp. ETP 001 from Eastern Tropical Pacific A-C Tetranemertes paulayi. Individual BOMAN- 07013, holotype, external appearance in life (A), and head compressed under coverglass (B) to show number and arrangement of eyes, and cephalic furrow (arrowhead). Note orange blood vessels (inset, and white arrowheads). Individual BOMAN- 08291, paratype (C), stylets, viewed through the body wall of an individual compressed under coverglass (hence the orange tinge), inset emphasizes sculpted stylets (individual BOMAN- 08302) D-F Tetranemertes arabica. Individual BOMAN- 09099, external appearance in life (D), proboscis armature (E). Inset on E shows sculpted stylets (individual BOMAN- 08030). Individual BOMAN- 08050, head compressed under coverslip to show arrangement of eyes (F). Note the pink tinge to the body wall and proboscis wall, and orangish cerebral ganglia G Tetranemertes sp. ETP 001 from the Pacific coast of Panama (individual SMPP 0632). Scale bars: 3 mm (A); 0.2 mm (B, F); 50 μm (C and insets on C, E); 100 μm (E); 2 mm (D); 0.5 mm (G).