Tubifex conicus He, Wang & Cui, 2012

Cui, Yongde, 2017, Four species of Tubifex Lamarck (Annelida: Oligochaeta: Naididae) from Tibet, China, Zootaxa 4320 (2), pp. 366-378 : 371-372

publication ID

https://doi.org/ 10.11646/zootaxa.4320.2.10

publication LSID

lsid:zoobank.org:pub:961A9Ba8-98D5-4395-Be2A-892Fbe2Ffa70

DOI

https://doi.org/10.5281/zenodo.5256390

persistent identifier

https://treatment.plazi.org/id/03A48793-081B-FF80-0AC5-F959FD50CC3C

treatment provided by

Plazi

scientific name

Tubifex conicus He, Wang & Cui, 2012
status

 

Tubifex conicus He, Wang & Cui, 2012

( Figs 7–8 View FIGURE 7 View FIGURE 8 )

Tubifex conicus He, Wang & Cui, 2012: 160 View Cited Treatment –162, Fig. 1 View FIGURE 1 .

New material. IHB XZ20150602 a–e, 5 mature specimens, whole-mounted in Canada balsam, from Gyaring Co, preserved in IHB, CAS. Gyaring Co (30°58' 43″N, 88°28′04″E), a lake located in northern Tibet of China, ca. 4,648–4,659 m asl. Water depth 11–37 m, water temperature 6.3–8.9°C, pH 6.3–8.9, dissolved oxygen 7.3–7.7 mg / L, conductivity 323–329 µs/cm. Collected by Yongde Cui and Baoqiang Wang on 2 June 2015.

Description. Length 6.1–11.6 mm, width at genital segments X–XI 0.28–0.42 mm. Segments 38–65. Prostomium obtuse. Clitellum inconspicuous. No coelomocytes. Dorsal chaetae (0) 1 hair and 1–4 bifids per bundle. Hairs serrate, posteriorly generally absent ( Fig. 7A, B View FIGURE 7 ). Dorsal bifids pectinate, upper and lower tooth subequal, with 2–3 fine intermediate teeth ( Fig. 7A View FIGURE 7 ). Ventral chaetae bifid, 3–4 per bundle anteriorly, 2 per bundle posteriorly, upper tooth slightly longer than lower, with (0) 1–2 fine intermediate teeth ( Fig. 7C, D View FIGURE 7 ). Ventral chaetae in X present, unmodified. Ventral chaetae in XI absent. Male pores paired in line with ventral chaetae, middle to posterior of XI.

Chloragogen cells from VI onwards. Male genitalia paired in X–XI. Sperm funnel cup-shaped, 20 µm long, 40 µm wide ( Fig. 8A,B View FIGURE 8 : sf). Vas deferens 400–560 µm long, 12–15 µm wide, nearly 3–4 times as long as atrium, ciliated throughout and entering atrium apically ( Fig. 8A, B View FIGURE 8 : vd). Atrium spindle-shaped, 120–160 µm long, maximally 32–40 µm wide ( Fig. 8A, B View FIGURE 8 : at). Ejaculatory duct present. Prostate gland solid, 80–84 µm long, 60–64 µm wide, attached to ental portion of atrium ( Fig. 8A, B View FIGURE 8 : pr). Penis inconspicuous, surrounded by cuticular, symmetrical and funnel-shaped penial sheath. Penial sheath 36–40 µm long, 48–56 µm wide at ental end ( Fig. 8A, B, C View FIGURE 8 : ps). Testes paired in X, immediately behind septum 9/10. Ovaries paired in XI, immediately behind septum 10/11. Spermathecae absent.

Remarks. The main difference of our redescription from T. conicus as originally described ( He et al. 2012) is the absence of spermathecae. However, after our reinvestigation of the type series (holotype and paratypes), we are sure that the testes of T. conicus were mistaken for spermathecae in the original description. Further slight differences between the descriptions concern thickness of atrial epithelium (thicker in the redescription) and penial sheaths (thicker in the original description). They may relate to the stage of maturity or to different modes of interpretation of observations. The size and shape of atria in the original observation and this research are about the same. Penial sheaths appear to have a thick cuticle laterally in the holotype, but when comparing type series and our material, we found no significant differences in penial sheath thickness.

Distribution and habitat. Known from Yamdrok Yumco (Lake Yamzho Yumco), Gyaring Co, Chargut Co, Uruni Co, Chikui Co, Amdo Tsonak Co, Tibet, China. All these lakes are located at above 4,000 m asl in Tibet. Gyaring Co, the locality of present redescribed materials, is about 300 km from the holotype locality of T. conicus, Yamdrok Yumco. Freshwater and brackish water.

IHB

Institute of Hydrobiology, Chinese Academy of Sciences

CAS

California Academy of Sciences

Kingdom

Animalia

Phylum

Annelida

Class

Clitellata

SubClass

Oligochaeta

Order

Haplotaxida

Family

Tubificidae

SubFamily

Tubificinae

Genus

Tubifex

Loc

Tubifex conicus He, Wang & Cui, 2012

Cui, Yongde 2017
2017
Loc

Tubifex conicus

He 2012: 160
2012
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