Djeziraia adriani Diez & Sanjuan & Monnens & Artois 2023, sp. nov.
Creators: name: Diez, Yander L.
name: Sanjuan, Claudia
name: Monnens, Marlies
name: Artois, Tom
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Platyhelminthes
Rhabdocoela
Polycystididae
Djeziraia
Djeziraia adriani

description: Djeziraia adriani sp. nov.
urn:lsid:zoobank.org:act: 39C06707-C4B5-4640-9B0D-7CAC9784D00E
Figs 1B, G–H, 2B–C, F
Diagnosis
Species of Djeziraia Schockaert, 1971 with paired seminal vesicles. Gonads and atrial organs located caudally in the body. Prostatic stylet type IV 92–93 µm long, curved, S-shaped in live animals.
Etymology
Species named after Dr Adrian David Trapero Quintana (Havana University, Cuba), specialist in freshwater ecology and the taxonomy of Odonata.
Material examined
Holotype CUBA • 1 whole mount; Santiago de Cuba, Sardinero; 19°57′42″ N, 75°47′00″ W; 18 Mar. 2021; intertidal, mangrove area surrounding the mouth of Río Sardinero, 80 m from the beach, sample of sediment with rotten leaves and branches, salinity 32 ‰; https://id.luomus.fi/KV.698; FMNH.
Other material CUBA • 2 whole mounts; same collection data as for holotype; photographs of live specimens available; HU XIX.1.47–XIX.1.48.
Description
The live specimens are unpigmented (Fig. 2B–C), 0.8–0.9 mm long, measured on whole mounts. A pair of well-differentiated bristles (Figs 1B, 2B: bt) is located at the sides of the proboscis pore. The proboscis (Figs 1B, 2B: pr) represents less than 10% of the body length. A pair of eyes (Figs 1B, 2B: e) is located just behind the proboscis. The pharynx (Figs 1B, 2B: ph) is positioned in the anterior body half.
The gonads and atrial organs occur in the caudal body half (Figs 1B, 2C). The testes are located rostrally to the ovaries. The paired seminal vesicles (Figs 1B, 2F: sv) open through a single ejaculatory duct into the copulatory bulb. The ejaculatory duct is surrounded by the prostate vesicle type IV (Figs 1B, 2F: pv4). The cell bodies of the prostatic glands are extracapsular and enter the copulatory bulb proximally. The prostatic stylet type IV (Figs 1B, 2C, F: ps4; 1G–H) is tubular and 92–93 µm long (n = 3). The proximal funnel-shaped part of the stylet is 9–10 µm wide, and it tapers to a distally rounded tip, subdistally 4 µm wide; the aperture is completely terminal.
Oocytes are organised in a row and proximally diminish in diameter. The vitellaria run laterally, from the pharynx almost to the caudal body end. The female bursa is located next to the stylet. The common gonopore opens at 90%.
Remarks
Djeziraia adriani sp. nov. exhibits most diagnostic features of Djeziraia: the proboscis is very small, less than 10% of the body length; the atrial organs are located in the caudal body half; the prostate vesicle is interposed; and there is a single prostatic stylet type IV in the male atrium (cf. the other representatives of Phonorhynchoidinae Tessens, Janssen & Artois, 2014 with two or three stylets) (see Schockaert 1971; Artois & Schockaert 2001). A striking feature of the new species is the fact that there are two seminal vesicles, while there is only one in its congeners: Djeziraia euxinica (Mack-Fira, 1971) sensu Schockaert 1982, D. incana Artois & Schockaert, 2001, D. longystila Noreña, Damborenea, Faubel & Brusa, 2007, and D. pardii Schockaert, 1971. Furthermore, the presence of a diverticulum at the bursal stalk (Schockaert 1971) was not observed in our live specimens. Despite these differences, the overall morphology of the new species largely corresponds to what is described for Djeziraia, and we therefore provisionally include it in this genus. Molecular phylogenetic work may prove useful to confirm this preliminary classification.
The prostatic stylet type IV of all species of Djeziraia is a simple tube: it is slender and very long (D. longystila and D. incana) or short and straight (D. euxinica and D. pardii). In D. euxinica, the stylet is longitudinally striated and ends in a small hook. The general morphology of the prostatic stylet of D. adriani sp. nov. is comparable to that of D. longystila and D. incana. However, it is S-shaped in live specimens of the new species. Furthermore, the prostatic stylet of D. adriani (92–93 µm) is shorter than that of D. longystila (~275 µm; Noreña et al. 2007), D. incana (~179 µm, 295 µm in one specimen; Artois & Schockaert 2001), and D. euxinica (105–120 µm; Mac-Fira 1971; Artois & Schockaert 2001), and larger than that of D. pardii (~84 µm; Schockaert 1971). Both the presence of paired seminal vesicles and the morphology of the stylet support the validity of the new species, Djeziraia adriani sp. nov.
description: Published as part of Diez, Yander L., Sanjuan, Claudia, Monnens, Marlies & Artois, Tom, 2023, New species of Polycystididae (Platyhelminthes: Kalyptorhynchia) from Cuba and the Pacific coast of Panama, pp. 67-86 in European Journal of Taxonomy 856 on pages 72-74, DOI: 10.5852/ejt.2023.856.2029, http://zenodo.org/record/7554565