Idrisiella bourkaizensis, Mabrouki & Glöer & Taybi, 2022

Mabrouki, Youness, Glöer, Peter & Taybi, Abdelkhaleq Fouzi, 2022, Idrisiella bourkaizensis gen. et sp. n., a new valvatoid snail (Gastropoda: Hydrobiidae) from Morocco, Invertebrate Zoology 19 (1), pp. 18-23 : 20-21

Idrisiella bourkaizensis sp.n.

Figs 1–5 .

Holotype: ZMH 140901 , from Ain Bourkaiz , Moulay Yacoub province, (33°55′13.8″N 5°05′18.0″W), shell measurements: Shell height (SH) = 0.8 mm; aperture height (ah) = 0.55 mm; spire height (sh) = 0.3 mm; shell width (SW) = 1.0 mm; aperture width (aw) = 0.5 mm.

Paratypes: 5 specimens ZMH 140902 , from AinBourkaiz , MoulayYacoubprovince, (33°55′ 13.8″N 5°05′18.0″W)

Description: The valvatoid shell is translucent with 3.5–4 fast growing whorls ( Fig. 1 ). The apex is small and blunt. The aperture is ovate with a sharp peristome. The umbilicus is wide and open. The shell is 0.8 mm high and 1mm broad.

General appearance: The mantle is black. The tentacles are long and white, dark around the eyes. The operculum is reddish brown. Dark eyespots are visible ( Fig. 3 ).

Anatomy: The penis has a bulbous basis; the penis itself is flat and triangular with a small outgrowth on the left side ( Fig. 4 ). The female sex tract has a J-shaped bursa copulatrix and a coiled oviduct ( Fig. 5 ). A receptaculum could not be found.

Etymology: The specific name bourkaizensis refers to the type locality Ain Bourkaiz spring.

Habitat: Ain Bourkaiz is a large spring located at Moulay Yacoub province, about 14 km west of the city of Fez at an altitude of 540 m. A big part of the spring is arranged to supply drinking water. However, other small sources not reached by the arrangement still flowing naturally and feed the Bourkaiz River, where the new taxa can be found ( Fig. 6 ). The water flows through a stony bottom before entering a large swamp.

Idrisiella bourkaizensis gen. et sp.n. was found with different invertebrate aquatic species: Melanopsis premorsa (Linnaeus, 1758) s.l., Theodoxus fluviatilis (Linnaeus, 1758) ( Mollusca); Dugesia gonocephala (Girard, 1850) s.l. (Triclada); Limnatis nilotica (Savigny, 1822) (Hirudinea) ; Gammarus maroccanus Fadil et Dakki, 2001 ( Amphipoda ); Potamon algeriense (Herbst, 1785) s.l. ( Decapoda ); Calopteryx haemorrhoidalis (Vander Linden, 1825) ( Odonata , larvae); Tinodes sp. , Hydropsyche sp. ( Trichoptera , larvae); Baetis sp. ( Ephemeroptera , larvae).

Figures

Figs 1–5. Idrisiella bourkaizensis gen.et sp.n. 1 — holotype, 2 — paratype, 3 — penis in situ, 4 — penis, 5 — female sex tract. Abbreviations: bc — bursa copulatrix, e — eye, ovl — oviductula loop, p — penis, pa — penial appendix. Рис. 1–5. Idrisiella bourkaizensis gen.et sp.n. 1 — голотип, 2 — паратип, 3 — пенис in situ, 4 — пенис, 5 — женский половой канал. СокраЩениЯ: bc — bursa copulatrix, e — глаЗ, ovl — петлЯ овидуктулы, p — пенис, pa — вырост пениса.

Fig. 6. The sampling site and habitat of Idrisiella bourkaizensis gen. et sp.n. Рис. 6. Место сбора и биотоп Idrisiella bourkaizensis gen. et sp.n.