Orostylis caecus, GOBERT, STEFAN, ARMONIES, WERNER, DIEZ, YANDER L., JOUK, PHILIPPE, MONNENS, MARLIES, REVIS, NATHALIE, REYGEL, PATRICK, SMITH, JULIAN III, STEENKISTE, NIELS VAN & ARTOIS, TOM, 2022

GOBERT, STEFAN, ARMONIES, WERNER, DIEZ, YANDER L., JOUK, PHILIPPE, MONNENS, MARLIES, REVIS, NATHALIE, REYGEL, PATRICK, SMITH, JULIAN III, STEENKISTE, NIELS VAN & ARTOIS, TOM, 2022, Orostylis gen. nov., a new genus of Dalytyphloplanida with seven new species (Platyhelminthes: Rhabdocoela), Zootaxa 5115 (1), pp. 29-46 : 34

publication ID	https://doi.org/ 10.11646/zootaxa.5115.1.2
publication LSID	lsid:zoobank.org:pub:E78C0947-2E8A-4663-A428-9303E84D6924
DOI	https://doi.org/10.5281/zenodo.6346929
persistent identifier	https://treatment.plazi.org/id/2AFC47CD-3812-4978-A79B-9332120D003F
taxon LSID	lsid:zoobank.org:act:2AFC47CD-3812-4978-A79B-9332120D003F
treatment provided by	Plazi
scientific name	Orostylis caecus
status	sp. nov.

Treatment

Orostylis caecus sp. nov. Diez & Artois

( Figs. 3D View FIGURE 3 , 4B View FIGURE 4 )

Localities. Bahía Larga , Guamá municipality, Santiago de Cuba province, Cuba (19°58’57”N; 76°18’15”W) Intertidal, very fine sand in the upper 10 cm of the sediment, salinity 34‰ (Apr. 5, 2017): Type GoogleMaps locality. Bahía de Gibara , Holguín province, Cuba (21°06’00”N; 76°08’09”W) Intertidal, on very fine sand with organic material close to the mouth of the river, salinity 32 ‰ (Feb. 17, 2016) GoogleMaps .

Material. Observations on four live specimens, three of which were whole mounted afterwards, one designated holotype ( FMNH KV.692), the others deposited in the HU XIV .3.07– XIV.3.08.

Etymology. The specific name refers to the species’ lack of eye spots (Lat. “caecus” = blind).

Description. General morphology as described for the species above, with the stylet located anteriorly, lateral to the pharynx ( Fig. 4B View FIGURE 4 : ph, st). The body is unpigmented, slender, and 0.25–0.42 mm long (measured on two whole-mounted specimens). Eye spots are lacking. The mouth opens subterminally and is surrounded by few tactile hairs. The pharynx ( Fig. 4B View FIGURE 4 : ph) is 1/6–1/3 of the body length in live animals, measuring 104–120 µm in two whole mounts and bearing six slender tentacles anteriorly ( Fig. 4B View FIGURE 4 : pht).

The paired testes are located at both sides of the pharynx, each one connected to a seminal vesicle. The two seminal vesicles enter a small prostate vesicle. The stylet ( Figs. 3D View FIGURE 3 ; 4B View FIGURE 4 : st) is formed by a broad, proximal piece ( Fig. 3D View FIGURE 3 : bp) and a distal, small, hollow hook ( Fig. 3D View FIGURE 3 : h). The entire stylet is 24–31 μm long (x = 29 μm; n = 3) and 14–20 μm wide (x = 16 μm; n = 3). The hook is 8–15 μm long (x = 11 μm; n = 3) and 3–5 μm wide at its base (x = 4 μm; n = 3). The broad piece is partially filled by a granular secretion, either originating from the prostate vesicle or part of the prostate vesicle itself. A single ovary ( Fig.4B View FIGURE 4 : ov) is situated in the midbody and is surrounded by the gut.