ISSN 0704-3716

Canadian Translation of Fisheries and Aquatic Sciences

No. 5039

Ainudrilus oceanicus, a new genus and species of the family Tubificidae ()

N.P. Finogenova

Original title: Ainudrilus oceanicus - novyi rod i vid semeistva Tubificidae (Oligochaeta)

In: Zool. Zh. 61: 1255-1258, 1982

Original language: Russian

Available from: Canada Institute for Scientific and Technical Information National Research Council Ottawa, Ontario, Canada R1A 0S2

1983

10 typescript pages Secretary Secrétariat I. of State d'État

MULTILINGUAL SERVICES DIVISION — DIVISION DES SERVICES MULTILINGUES

TRANSLATION BUREAU BUREAU DES TRADUCTIONS

LIBRARY IDENTIFICATION - FICHE SIGNALÉTIQUE TP-4- 5 Translated from - Traduction de Into - En Russian English

Author - Auteur N. P. Finogenova

Title in English or French - Titre anglais ou français

Ainudrilus oceanicus, a new genus and species of the family Tubificidae (Oligochaeta)

Title in foreign language (Transliterate foreign characters) Titre en langue étrangère (Transcrire en caractères romains) Ainudrilus oceanicus - novyi rod i vid semeistva Tubificidae (Oligochaeta) Reference in foreign language (Name of book or publication) in full, transliterate foreign characters. Référence en langue étrangère (Nom du livre ou publication), au complet, transcrire en caractères romains. Zoologicheskii zhurnal

Reference in English or French - Référence en anglais ou français Zoological Journal

Publisher - Editeur Page Numbers in original DATE OF PUBLICATION Numéros des pages dans Academy of Sciences DATE DE PUBLICATION l'original

of the USSR Year Issue No. 1255 —1258 Volume Place of Publication Année Numéro Number of typed pages Lieu de publication Nombre de pages dactylographiées Moscow (USSR) 1982 61 8

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Person requesting Demandé par R. O. Brinkhurst UNEDITED TRANSLATION For information only Your Number Votre dossier no TRADUCTION NON REV1SEE Information seulement Date of Request Date de la demande 13 October 1983 DEC - 2 1983

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1253741 Russian ii • N. DEC - 2 1983

Zoologicheskii Zhurnal (Zoological Journal), 1982, vol. 61: pp. 1255-1258.

UDC 595.142.3 Ainudrilus gen. et sp. n.

Ainudrilus oceanicus - novyi rod i vid semeistva 1255. Tubificidae (Oligochaeta)

Ainudrilus oceanicus, a new genus and species of the family Tubificidae (Oligochaeta)

N. P. Finogenova

In samples from the littoral zone of seas in the Far East we found some oligochaete worms with a distinctive mor- phology, for which we have established a new genus and species, described below.

Ainudrilus Finogenova, gen. n.

Setae only bifurcate crotchets; modified penial setae present in ventral fascicles on segment XI. Within the body

* The numbers in the right-hand margin indicate the corres- ponding pages in the original text. (Tr.).

SEC 5 - 25 (Rev. 82/11) Canaclâ 2 cavity there are many large coelomocytes. Nephridia with post- septal of the enchytraeid type. Integumentary flexus present. Testes in segment X, ovaries in XI. Male gonoduct with a very short but distinct vas deferens, a tubular and spirally twisted atrium (with ciliated epithelium), which passes distally into a large penial chamber with thick muscular walls and a long efferent duct, terminating in an external pore. There is no penis. Prostate glands absent, though individual prostate cells are deeply embedded in the epithelium of the wall of the atrium along the whole length of the tubular section. Genital openings raired, on segment XI. The openings of the seminal rece‘ptacles in segment X beside dissepiment 9/10 are paired. Spermatozeugmata absent. Egg funnels large, oviducts short, well developed.

Ainudrilus oceanicus Finogenova, sp. n. (Figures 1, 2)

Material. Kuril Islands: Urup Island, Pacific coast, Cape Temnyi, 18 September 1969, section 103, sample 131 (N. I. Kashin) - holotype No. 1/45672 (series of anatomical sections), paratypes 2 - 3/45673-74 (including 1 specimen in alcohol and 1 series of anatomical sections); Paramushir Is- 129 land, Severnyi Kuril'sk, 5 September 1967, section 27, collec- ted on Fucus+Balanus (V. M. Sukhanov) - 25 sexually mature specimens; Paramushir Island, Utesnyi settlement, section 22, collected on Fucus+Monostroma - 27 sexually mature specimens. Beringa Island, Cape Zabiyaka, 13 July 1964 (N. A. Kolotovkina) - 6 sexually mature specimens. 4. 3

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Z'

`• • e.A5 12 .

Pac. I. Ainudrilus oceunicus - gen. n., sp..n.: a— nealla.ibabze =maim, 6 — necIlmaidi XV cerateaTa, 8--cpe3- B obeacta nermaabaoll aamephr, —cpea. a o6oacra cemanpoanaa K rtigmalort qacTir aTpita; J — crunniaa aonactb RecP- , pa.zan, -2 — B BOJIHO npoToK nectepaamr, 3— 3HTa.lbHbi oTrtp,, arpHyf,-4 — uput.idiatiermie x.lerfui—, 5— sfecro anaaelnia TP3r6qaTorf qacTa aTpaa B newt- aabapo xamepy, 6 — nennanbnasi aamepa, 7— MWWIbZ neana..ibaoà aamepu„. 8— BEJ130,1H0 ilpOTOK aTpani 9 — ceoft angunx Tpy6qaTori qacra œrpaa, 10— cemeaaan aopoaan,....1/—cemanpnao,a, 12 — ,mccennmeirr

Figure 1. Ainudrilus oceanicus gen. n., sp. n.: a - penial setae, b - nephridium of segment XV, v - section in region of penial chamber, g - section in region of vas deferens and tubular part of atrium; 1 - dorsal lobe of nephridium, 2 - efferent duct of nephridium; 3 — entai section of atrium, 4 — prostate cells, 5 — location of entry of tubular part of atrium into penial chamber, 6 — penial chamber, 7 — muscles muscle of penial chamber, e - effërent duct of atrium, 9 — layer of tubular part of atrium, 10 - sperm funnel, 11 - vas deferens, 12 - dissepiment. •

édfuus_oceanicus_gen_m_sp_rt.:_a— my•cKoil rolioaywr (oTriperta- poaaH), — cemenpuemium; 1— cemettuaH soporiKa, 2— anecernimetr, 3 — Tpy6traTaft tiacrb arpini, 4 — rientubitag Kamepa, 5— Bbil301H011 npeyroh: atouR, 6— autioamori-nporoK cesteapHennuca, 7— amny.aa cemenonemaaxa

Figure 2. Ainudrilus oceanicus gen. n., sp. n.: a - male gonoduct (dissected out), b - seminal receptacle; 1 - sperm funnel, 2 - dissepiaent, 3 - tubular part of atrium, - penial chamber, 5 efferent duct of atrium, 6 - effe- rent duct of seminal receptacle, 7 - ampulla eseminal re- ceptacle. le. • 5

Description. Setae with distal tooth shorter and thinner than lower tooth. In front of clitellum in fasci- cles of 2-4 setae, behind clitellum in fascicles of 1-2 setae. On segment XI in the ventral fascicles there are 7 bidentate penial setae,the distal tooth of which is smaller than in the limmalsetae. The fascicle of the penial setae is situated transversely to the body, the upper ends of the setae are con- vergent (Figure 1, a). Nodulus on normal setae at a distance of 1/3 of the way from the distal end, weakly expressed; on penial setae at a distance of 1/11 of the way from distal end. Length of normal setae 125-150 g, of penial setae 235 g. 1257 Openings of seminal receptacles in line with the ventral setae on segment X beside dissepiment 9/10. Male genital openings in line with the ventral setae on segment XI. Clitellum on last third of segment X to first third of segment XIII. Small pharyngeal glands present in segment III. Oeso- phageal glands present in segments IV-V. Cloragogen tissue commences from segment VI. Within the body cavity there are many large (7.5-12.5 g in diameter) coelomocytes of two kinds: strongly granular (few in number) and more homogeneous. Neph- ridia from segment VII, with a dorsal lobe and a narrow effe- rent duct (Figure 1, b). Body wall with a thick layer of

muscles (20 - 110 g in thickness). Dissepiments strongly deve- loped. In the pre-clitellar segments they are up to 15 g in thickness. Sperm funnels large, festooned. Vasa deferentia very short (60 g) and wide (60 g). Atrium tubular in its proximal part, with a ciliated epithelium on the inner side, spirally twisted, with loops that aré closely adjacent to one another 0, 6

(Figure 1, g; 2, a). Prostate tissue, in the form of separate Prostate cells,developed along the whole length of the tubular section of the atrium along the outer margin of its rings. The prostate cells protrude past the margin of the wall of the at- 125e rium, creating an uneven surface of the loops. In sections they have a coarsely-granular structure. Penial chamber of an egg-shaped form, with muscular walls and Amml a narrow efferent duct, terminating in an exter- nal pore. The entai tubular section of the atrium runs into the penial chamber subapically (Figure 1, v). Dimensions of atrium: width of tubular section of atrium 45-70 g, width of lumen of tubular section of atrium 12.5-25 g, width of penial chamber 135 g, length 160 g, width of efferent duct 50 g, length of efferent duct 175 g. Seminal receptacles with very short efferent ducts, their ampullae of a characteristic mushroom- shaped form (Figure 2, b). Orenings of seminal receptacles close to dissepiment 9/10. The seminal receptacles were full of sperm. Dimensions of seminal receptacles diameter of am- pulla in its widest part 325-345 g, height of ampulla 160-175 g, width of efferent duct 90-95 g, its length 60-85 g. Egg funnels large (100 g in diameter), attached on dissepiment 11/12. Width of oviduct 25 g. There are 2 seminal vesicles: anterior (extending to segment VIII) and posterior (to segment XV). Body length of sexually mature specimens 8.5-20 mm, thickness in region of clitellum 500-600 g. Number of seg- ments 50-70. e . ' 7

Remarks • A very distinctive feature of this genus is the arrangement of the prostate cells, not on the surface of the atrium but rather embedded deeply in its walls. Histo- logically the prostate cells are differentiated from the epi- thelial cells by their distinct coarsely-granular structure. This type of spatial distribution of the prostate cells has not been noted in other genera of tubificids. Also unusual is the ectal part of the atrium, the large penial chamber with its thick muscle layer, and the thin and fairly long efferent duct. The topography of the genital apparatus of Ainudrilus at first glance resembles that of the genus Bret: the tubular part of the atrium may be taken for the vas defe- rens of Rhyacodrilus, while the penial chamber (especially based on the character of the transition of the tubular part of the atrium into the penial chamber) may be taken as its atrium. With attentive examination, however, it is evident that this similarity is only superficial. The new genus belongs in the subfamily Rhyacodrilinae Hr. and is most closely related to Lev. Like Monopylephorus, it is characterized by having a very short vas deferens, a tubular atrium with a voluminous ectal part, the presence of an integumentary flexus, and nephridia with a sacciform postseptal (of the enchytraeid type). It is diffe- rentiated from Monopvlephorus by the following features: prostate cells present along the whole length of the tubular part of the atrium (in Monopylephorus - only in the entai part), they penetrate deeply into the wall of the atrium (in Monopyle- phorus - on the surface of the wall), ciliated epithelium pre- sent along the whole length s of the tubular part of the atrium 8

(in Monopylephorus - only in the entai part), penial setae pre- sent (absent in Monopvlephorus), male genital openings strictly paired (in the genus Monopvlephorus there is a tendency towards a fusion of the male genital openings into one). Within the composition of the subfamily Rhyacodrilinae, in addition to Ainudrilus, we include the following genera: Epirodrilus Hr., Monopvlephorus Lev., Rhizodrilus Smith, Peris- todrilus Brinkhurst et Baker (here is assigned Rhizodrilus mon- tanus Hr.), Rhvacodrilus Bretscher, Iolvdrilus Marcus and Pro- tuberodrilus Giani et Martinez -A.nsemil. Characteristic fea- tures of this subfamily are: the presence of large coelomo- cytes in the body cavity, the absence of spermatozeugmata, a diffuse prostate (if present), the absence of a true penis (with rare exceptions) and, in most genera, nephridia with a post- septal of the enchytraeid type.

Zoological Institute of the Received USSR Academy of Sciences 14 July 1981 (Leningrad)

AINUDRILUS OC.EANICUS,A NEW GENUS AND SPECIES OF THE FAMILY TUBIFICIDAE (OLIGOCHAETA) N. P F1NOGENOVA Zoological Institute, USSR Academy of Sciences (Leningrad)

Summary

Ainudrilus oceanicus gen et. sp. n. (Rhyacodrilinae) from the littoral zone of the *far East seas of the USSR is described. The new genus and species is distinguished by short vase deferentia; --tubular— spiral atrium, - terminated distally by a large penial chamber. urith muscle walls and a long excretory duct; absence of penis; single prostatic cells submerged into-- the-epithelium of the atrium wall; croched setae; ....presence of modified penial setae in XI segment. _