Fridericia bulboides Nielsen & Christensen, 1959

Lu, Yajing, Xie, Zhicai & Zhang, Junqian, 2018, Preliminary taxonomical investigation of soil enchytraeids (Clitellata, Enchytraeidae) from south region of Tibet, China, Zootaxa 4496 (1), pp. 395-410 : 399

Fridericia bulboides Nielsen & Christensen, 1959

( FigURE 3A )

Fridericia bulboides Nielsen & Christensen, 1959 . Christensen 1961; Dash 1970; Möller 1971; Kasprzak 1979; Chaluspký 1986; Kasprzak 1986; Rota 1994; Rota & Healy 1994; Rota 1995; Wang et al. 1999; Schmelz 2002, 2003; Schmelz & Collado 2010.

Examined material. XZO201604007, XZO201604008, TWO FUllY maTURE SPEcimENS, WhOlE-mOUNTEd aNd STaiNEd. SiXTEEN FUll maTURE SPEcimENS iN 70% EThaNOl.

Description. Small SPEciES. BOdY lENgTh 4–5 mm (6.4–9.2 mm iN ViVO). SEgmENT NUmbER 28–31. ChaETaE USUallY 2–4 PER bUNdlE. ChaETaE FORmUla: 2-4 – 2-4: 3,4 – 2-4. EPidERmal glaNd cEllS cONSPicUOUS iN PREcliTEllaR REgiON, ONE TRaNSVERSE ROW PER SEgmENT ( Fig. 3A ). CliTEllUm ElEVaTEd cONSPicUOUSlY, giRdlE-ShaPEd. BRaiN 152–160 Μm iN lENgTh, 75–98 Μm iN WidTh, SlighTlY cONcaVE aNTERiORlY, TRUNcaTE POSTERiORlY. OESOPhagEal aPPENdagES UNbRaNchEd, lONg, USUallY cOilEd iNTO a maSS iN IV/V, ThEN EXTENdiNg backWaRdS iNTO VI OR VII. ThREE PaiRS OF PhaRYNgEal glaNdS iN IV–VI; FiRST PaiR WiTh dORSal cONNEcTiON, SEcONd aNd ThiRd PaiR WiTh VENTRal lObES. FiVE PaiRS OF PREcliTEllaR NEPhRidia FROm VI/VII TO X/XI. ANTESEPTalE 26–31 Μm lONg, 16–18 Μm WidE, POSTSEPTalE 62–68 Μm lONg, 20–32 Um WidE, EFFERENT dUcT RiSiNg mEdiallY OR clOSE TO SEPTUm. MUcOcYTES WiThOUT REFRacTilE VESiclES, 30– 37 Μm iN diamETER. LENTicYTES ScaRcE. ChYlUS cEllS iN XIII–XIV. DORSal blOOd VESSEl RiSiNg FROm XIV–XVII. BlOOd cOlORlESS. CliTEllUm aT XII–1 /2XIII, WEll-dEVElOPEd, giRdlE-ShaPEd. SPERm FUNNEl 2–3 TimES aS lONg aS WidE, 82–87 Μm iN lENgTh aNd 33–38 Μm iN WidTh. COllaR aS WidE aS FUNNEl bOdY, abOUT 30–35 Μm WidE. HEad OF SPERmaTOZOa abOUT 80 Μm lONg. VaS dEFERENS ThiN aNd lONg, 5–8 Μm WidE, WOUNd iN iRREgUlaR lOOPS iN XII. BURSal SliT lONgiTUdiNal. SUbNEURal glaNdS abSENT. SPERmaThEca iN V, WiTh a ball-ShaPEd EcTal glaNd, 15–19 Μm iN diamETER. EcTal dUcT 112–124 Μm lONg aNd 10–12 Μm WidE. AmPUlla ONiON-ShaPEd, WiThOUT diVERTicUla, diamETER 26–29 Μm, 2–3 TimES WidER ThaN EcTal dUcT.

Differential diagnosis. ThE mORPhOlOgical chaRacTERS OF OUR SPEcimENS cORRESPONd WEll TO ThE dEScRiPTiON giVEN bY SchmElZ (2003), EXcEPT FOR ThE SiZE OF ThE FUNNEl cOllaR (aS WidE aS VS. NaRROWER ThaN FUNNEl bOdY). IN ChiNa, ThE WORmS WERE FOUNd iN HUbEi, YUNNaN, JiNliN PROViNcES aNd TibET.

Figures

FIGURE 3. Micrographs of Fridericia bulboides Nielsen & Christensen, 1959 (A, in vivo), Fridericia cusanica Schmelz, 2003 (B, C, fixed), Fridericia perrieri (Vejdovský, 1878) (D, E, fixed), and Fridericia bretscheri Southern, 1907 (F–I, in vivo). Fridericia bulboides: A. Epidermal gland cells (arrows). Fridericia cusanica: B. Pharyngeal glands. C. Spermatheca (arrow). Fridericia perrieri: D. Spermatheca with diverticula (arrows). E. Sperm funnel (arrow). Fridericia bretscheri: F. Spermathecae (arrows). G. Oesophageal appendages. H. Clitellar glands, dorsal view. I. Coelomocytes. Scale bars: H,I: 25µm; A,C,D,E,F,G: 50 µm; B: 100 µm.