Chamaedrilus chalupskyi, Martinsson, Rota & Erseus, 2015 a

Martinsson, Svante, Klinth, Mårten & Erséus, Christer, 2018, A new Scandinavian Chamaedrilus species (Clitellata: Enchytraeidae), with additional notes on others, Zootaxa 4521 (3), pp. 417-429 : 422-423

Chamedrilus chalupskyi Martinsson, Rota & Erséus, 2015a

Figure 2 A–B

Material studied. CE22111, CE22112, CE32524, CE32998, CE32999, CE33033 (all from Norway), and CE33370 (from Sweden), all specimens mature, see Table 1 for more information

Description of genital organs. Male genitalia ( Fig. 2A ) paired. Sperm funnel cylindrical, about 255–330 µm long, 80–115 µm wide, making them about 3 times longer than wide; collar 55–90 µm wide. Vas deferens coiled numerous times around ovaries ( Fig. 2A ), at least 2000 µm long, about 10 µm wide. Penial bulb about 75–100 µm long. Male pores in one of segments IX–XII, mostly X. Spermathecae ( Fig. 2B ) paired; pore located slightly below line of lateral chaetae; duct smooth, 155–285 µm long, about 20–25 µm wide; ectal gland 55–85 µm in diameter; ampulla spherical, about 45–70 µm wide, containing sperm arranged in circle; ampulla followed by duct connecting to spherical ental chamber, about 60–190 µm wide, containing loosely packed sperm; ampulla in V or VI, ental chamber of one spermatheca usually occupying VI and the other VII; spermatheca not connected to oesophagus.

Remarks. In the original description of this species, Martinsson et al. (2015a) described the sexual characters from a specimen with rudimentary male genitalia. Thus, we here amend this by describing the fully developed male genital duct and spermatheca. However, this species mainly reproduces by fragmentation, and sexually mature specimens are rare.

Figures

FIGURE 2. A, B. Chamaedrilus chalupskyi. A. Male genital duct. B. Spermatheca. C. C. varisetosus, spermatheca. Abbreviations: ec = ental chamber; eg = ectal gland; pb = penial bulb; sa = spermathecal ampulla; sd = spermathecal duct; sf = sperm funnel; vd = vas deferens. Scale bars: 100 µm.