Andiorrhinus (Quibario) tatuy, Feijoo & Brown & James, 2017

Feijoo, Alexander, Brown, George G. & James, Samuel W., 2017, New species of Andiorrhinus Cognetti, 1908 (Oligochaeta: Rhinodrilidae) from Venezuela and Brazil, Zootaxa 4363 (1), pp. 55-78 : 72

Andiorrhinus (Quibario) tatuy sp. nov.

( Figure 8A–E )

Material examined. Holotype: Clitellate specimen ( MZUSP 01475 ). Locality : Venezuela, state of Mérida, Mount Zerpa (08°37'N, 71°09'W). Altitude : 1800–2200 m a.s.l. Collection date: 20 July 1996. Collectors: Pedro Durant and E.J. Arellano . Paratype: 1 adult (MZUSP 01474).

Etymology. The new species was named in honor of the indigenous community Tatuy (= the longest established), that inhabit the state of Mérida, Venezuela.

Description. Epiendogeic species, with brown-colored dorsum and ventral region and reddish brown clitellum, which correspond to the respective color code numbers 701 and 706 ( Seguy 1936), and cylindrical body. Holotype: The length of the preserved holotype is 160 mm, with a diameter of 5.6 mm in the preclitellar region, 6.6 mm in the clitellum, and 5.1 mm in the postclitellar region. Number of segments: 116. Paratype: 160 mm long and widths of 5.5 mm (segment 9), 5.8 mm (segment 19) and 5.0 mm in segment 30. Number of segments: 96. The first two segments are partially invaginated and only with dissection is it possible to determine that two small rings do not correspond to the peristomium. The long, tentacular-shaped prostomium measures 2.5 mm and is divided into six segments, the first three segments thick and the latter three thinner, ending in a lobe-shaped tip. Four pairs of closely paired setae are visible as of segment 10. The sigmoid common setae measure 0.9 mm and present strong curvature ( Fig. 8A ). The distance between the setae in segments 30–33 is aa:ab:bc:cd:dd = 5.0:1.0:7.7:0.7:23.3 and, in the posterior region in segment 75, is 9.3:1.0:7.0:1.3:24.3. The setae ab of segments 7–9 and 18–23 are transformed as genital setae and are located internally below five pairs of genital setal gland masses in segments 19–23 ( Fig. 8B ). Genital setae are covered with long follicles, measure 2.16 mm, are slightly curved at the proximal end and present no ornamentations. In the following 2/3, grooves with deep, V-shaped tunnels are present.

The saddle-shaped clitellum measures 15.2 mm and lies in segments 16–25 (=10), with the tubercula pubertatis located between segments 20–22 (=3) ( Fig. 8C ). The male pores are located in segment 20 and female pores in segment 16. The nephropores are aligned with setae c and d. Three pairs of spermathecal pores were observed in intersegments 6/7, 7/8, 8/9, above the row of setae c.

Internal anatomy. The anterior septa of segments 6/7–10/11 are very fine, being thicker only between segments 11/12–14/15. The round muscular gizzard and thick musculature are present in the cavity of segment 6. Three pairs of digitiform calciferous glands of lamellar structure are present in segments 7–9, with an apical appendage; 22 parallel lamellae per gland ( Fig. 8D ). The esophagus-intestine transition begins in intersegment 25 and the Sshaped typhlosole begins in segment 26, occupying 1/3 of the intestinal lumen. There are no intestinal caeca. Intestinal content consisted mostly of abundant fine organic matter, especially cellulose residues, with absence of small stones or quartz-type minerals. Three pairs of lateral hearts are located in segments 7–9 and three voluminous intestinal hearts are present in segments 10, 11 and 12 ( Fig. 8D ). Both supraesophageal and subesophageal vessels are present. There is one pair of vesiculated holonephridia, covering the lateral sides of the esophagus.

Two pairs of testis sacs enclose the testes in segments 10 and 11, and two pairs of seminal vesicles are present in segments 11 and 12. The two pairs of deferent ducts open towards the male pore in segment 20, next to the row of setae ab. One pair of ovaries is present in segment 13. Three pairs of elongated spermathecae are present in segments 7 (2.5 mm long), 8 (3.8 mm), and 9 (4.2 mm) ( Fig. 8E ). There is a strongly constricted area in 2/3 where the seminal chambers are located. The spermathecal duct is piriform and larger than in other Andiorrhinus species. The oblong ampulla opens after the seminal chambers.

Remarks. Andiorrhinus (Quibario) tatuy is unique among Andiorrhinus for having three pairs of intestinal hearts in segments 10, 11, and 12. The species is closely related to A. (M.) boconius , A. (M.) mukuci , and A. (M.) rimeda due to the position of the clitellum and tubercula pubertatis. However, these species differ from A. (Q.) tatuy in the number of lamellae in the calciferous glands, the shape of the spermathecae, shape and size of the normal setae, and ornamentation of the genital setae.

Figures

FIGURE 8. Andiorrhinus (Quibario) tatuy sp. nov., holotype. A. Common seta, segment 38. B. Genital seta b, segment 8. C. External, ventral view of clitellum.D. Intestinal hearts in segments 10, 11 and 12. E. Spermathecae of 7, 8, 9.