Haber zavreli ( Hrabe , 1942)

Dumnicka 1, Elzbieta & Wojtal 1, Agata Z., 2021, Revalidation of the stygobiotic species Haber zavreli (Hrabĕ, 1942) (Clitellata, Naididae, Tubificinae) with discussion on the closely related species Haber speciosus (Hrabĕ, 1931) and Haber monfalconensis (Hrabĕ, 1966), Subterranean Biology 39, pp. 143-156 : 143

Haber zavreli ( Hrabe, 1942)

Peloscolex zavreli Hrabě 1942: 23-26 (description of species, type locality: Rajec u Žiliny, in wells);

Peloscolex speciosus (partim) ( Brinkhurst and Jamieson 1971): 514-515;

Peloscolex zavreli ( Kasprzak 1973): 421-422 (short description of two specimens found in the wells in the Beskidy Mts, Poland)

Haber zavreli ( Holmquist 1979): 52-53 (redescription);

Peloscolex speciosus zavreli ( Hrabě 1981): 87-88 (distribution, short taxonomic discussion);

Haber zavreli ( Brinkhurst 1981): 1062 (citation)

Redescription.

Almost all mature specimens without the posterior part of the body. Length of complete mature individuals: 10-11 mm, number of segments: 64-68. Body wall without papillae and without mucous cover, usually smooth, but in some specimens with tiny wrinkles (Fig. 1 ).

Singular long and smooth hair seta (Fig. 1 ) in all dorsal bundles (exceptionally two setae in anterior segments). Pectinate setae with long teeth in all segments (Fig. 2A-C ). The length of external and intermediate teeth is almost the same, but external ones are stouter. In anterior segments 5-7 intermediate teeth (Fig. 2A, B ) and distal end of the setae shovel-shaped, in posterior segments it is goblet-shaped with 3-4 intermediate teeth (Fig. 2C ). In the anterior dorsal bundles 1-2 setae, in the posterior segments - 1 seta. All ventral setae with the upper teeth longer than the lower (Fig. 3A-C ): in anterior segments about two times longer (Fig. 3A ), from segment VIII this difference is smaller (Fig. 3B, C ). The singular modified spermathecal and penial seta is present respectively in segments X and XI. They are thin and sharp-ended with hollowed distal part (Fig. 4A, B ) and they are inserted inside glandular sacs. The length of setae of mature individuals: hair setae up to 1000 µm long; dorsal anterior: 103-132 µm; posterior: 87-103 µm; ventral anterior: 230-243 µm; ventral posterior: 148-160 µm; spermathecal setae: 55-70 µm and penial setae 55-63 µm.

Long, irregular sac-like ampullae of spermathecae (Fig. 5 ) sometimes reach IX segment, short spermathecal duct set off suddenly from ampulla and its ectal opening occurs slightly dorsally from the line of spermathecal setae. The long, “worm-like” spermatozeugmata either fill whole ampulla or are concentrated in its ental part. Male funnel small, vas deferens very long, coiled (Fig. 6a ) with distal part slightly thinner and shorter than proximal one. Proximal part of vas deferens narrower than tubular atrium (Fig. 7a ) and enters to it apically. Prostate gland small and compact enters to atrium almost medially (Fig. 7b ). Thin ejaculatory duct markedly sets off from the atrium (Fig. 7c ). Penial apparatus elongated with two, well visible bulges - one with basal membrane (the so-called "penis sheath"), and the second one with penial seta (Fig. 6b ).

Figures

Figure 4. Haber zavreli (Hrabĕ, 1942) A spermathecal seta in glandular sac B penial seta in glandular sac.

Figures 1 - 3. Haber zavreli (Hrabĕ, 1942) 1 fragment of the body with hair seta and tiny wrinkles seen on dorsal side 2 shape of dorsal pectinate setae: 2 A in V segment 2 B in VII segment 2 C in XV segment 3 shape of ventral setae: 3 A in IV segment 3 B in VIII segment 3 C in XV segment.

Figures 5 - 7. Haber zavreli (Hrabĕ, 1942) 5 Fragment of the body with spermathecal ampulla (marked by red frame) filled with long spermatozeugmata 6 a fragment of vas deferens 6 b penial apparatus 7 ectal part of male genital apparatus: a atria b prostate gland c ejaculatory duct.