Myrianida prolifera ( O .F. Müller, 1788 )

Nygren, Arne, 2004, Revision of Autolytinae (Syllidae: Polychaeta)., Zootaxa 680, pp. 1-314: 151-152

publication ID

10.5281/zenodo.157809

publication LSID

lsid:zoobank.org:pub:471A4E52-4C92-44F8-AB38-CD03071C0067

persistent identifier

http://treatment.plazi.org/id/03CDB626-CCE1-4EB7-FEE8-7C2D897285FD

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scientific name

Myrianida prolifera ( O .F. Müller, 1788 )
status

 

Myrianida prolifera ( O.F. Müller, 1788)  (Fig. 75 A –E)

Nereis prolifera O.F. Müller, 1788: 15  , pl. 52, fig. 5–9.

Autolytus prolifera Grube 1850: 310  .

Myrianida prolifera Quatrefages 1866: 63  –64.

Autolytus ehbiensis  in part Saint­Joseph, 1887: 228 –233. pl. 11, fig. 106–107, pl. 12, fig. 114–115; McIntosh 1910: 243 –245, pl. 86, fig. 16, plate 87, fig. 15; Fauvel 1923: 314 –315, fig. 121 I –L.

Autolytus prolifer Gidholm 1963  ; 1965; 1967: 182, 186 – 188, figs 2 A, D, 7 A, 8 A, B, 14 A, 15, 18; Mattisson 1969; Hamond 1969 a; Hartmann­Schröder 1971: 179–180, fig. 57 A –F; Schiedges 1979 a; 1979 b; Kirkegaard 1992: 231–233, fig. 133 A –F; Hartmann­Schröder 1996: 184, fig. 79 A –F; Nygren & Sundberg 2003: GenBank sequences, 16 S rDNA partial sequence AF 474249View Materials, and 18 S rDNA partial sequence AF 474295View Materials.

Material examined. France: 2 syntypes of Autolytus ehbiensis  MNHNAbout MNHN 1050, 1055, Dinard, Aug – Jul 1876 –1881. Faroes: 8 spms (7 spms on slides (6 rear ends in author's collection for DNAAbout DNA analyses), 1 spm in author's collection for DNAAbout DNA analyses), Kaldbak marine laboratory, 62 °N 06°W, dive, 1–4 m, Laminaria  with epifauna, 21 Jun 1997. Wales: 7 spms on slides (rear ends in author's collection for DNAAbout DNA analyses), Black Point, 53 ° 18.8 'N 04° 2.4 'W, intertidal, algae with epifauna, May 2000. Sweden: 6 spms in author's collection for DNAAbout DNA analyses, Gullmarsfjorden, Lökarna, 58 ° 13.6 'N 11 ° 24.8 'E, dredge, 32–36 m, shells and stone with hydroids, 19 Nov 1997; 30 spms in formalin, Tjärnö archipelago, Inre Vattenholmen, 58 ° 52 'N 11 °06'E, intertidal, algae with epifauna, Apr, 2002. Norway: 4 spms on slides (rear ends in author's collection for DNAAbout DNA analyses), Trondheim, Zoologisk station, 63 ° 26.5 'N 10 ° 20.9 'E. intertidal on docks, mussels with epifauna, 20 Jan 2002.

Diagnosis. Myrianida  with 24–33 equal teeth in trepan, and a well­developed basal ring with infradental spines; cirrophores and cirrostyles unequal, cirrophores always shorter than cirrostyles.

Description. Length 3.6–12.2 mm for 22–69 stock chaetigers, width 0.25–0.45 mm. Live specimens faintly reddish (Fig. 75 A) or yellowish, intestine with scattered white specks from intestinal granular accumulations; tips of anterior appendages sometimes reddish; eyes red. Ciliation as 1 troch per segment.

Eyes separated (Fig. 75 A); eye spots present. Palps in dorsal view projecting c. 1 / 3 of prostomial length (Fig. 75 A), fused. Extension of nuchal epaulettes from beginning to end of chaetiger 2 (Fig. 75 A).

Median antenna reaching chaetiger 8–13 (n= 9) in live specimens. Lateral antennae and dorsal tentacular cirri, length 1 / 2 – 2 / 3 of median antenna. Ventral tentacular cirri 1 / 2 as long as dorsal pair. First dorsal cirri as long as median antenna, second dorsal cirri 1–1.5 times the ventral tentacular cirri. From chaetiger 1–27 cirri with usual alternation in direction, followed by 1–2 DDUU­groups, and a varying number of DMU­, DDU­, and DDUU­groups (n= 9). Dorsal cirri from chaetiger 3, alternate in length (Fig. 75 A, B); short cirri equals 1 / 2 – 2 / 3 of body width, long cirri equal or 3 / 4 as long as body width. Cirrophores present on tentacular cirri, and all dorsal cirri. Cirrophores and cirrostyles unequal (Fig. 75 B); cirrophores and cirrostyles on short cirri 3 / 4 in length of its counterpart in long cirri; cirrophores on short cirri equal to or slightly shorter than parapodial lobes, cirrophores on long cirri longer than parapodial lobes; cirrophores shorter than cirrostyles. All appendages cylindrical (Fig. 75 A, B).

Parapodial lobes rounded, of medium –large size. Anterior chaetigers with 2 or rarely 3 aciculae, 1–2 in median and posterior. Chaetal fascicle with 9–16 compounds in anterior chaetigers, 4–9 in median and posterior. Compound chaetae with small distal tooth (Fig. 75 D); serration present. Single thin bayonet chaetae (Fig. 75 E), beginning between chaetiger 1–25.

Pharynx with 1 sinuation anterior to proventricle. Trepan in chaetiger 1–3, with 24–33 equal teeth, arranged in 1 ring (Fig. 75 C). Basal ring present; infradental spines present (Fig. 75 C). Proventricle equal in length to 2–3 segments (Fig. 75 A) in chaetiger 8–13 with 28–35 rows of muscle cells (n= 16). Anal cirri equal in length to 1.5 times body width.

Reproduction and morphology of epitokous stages. Schizogamy by gemmiparity behind chaetiger 22–44. No mature stolons examined. Gidholm (1965; 1967) present detailed information on stolon morphology. Male c. 3 mm for 3 +(17–20) chaetigers, 2 pairs of tentacular cirri; female c. 3 mm for 2 +(15–18) chaetigers, 2 pairs of tentacular cirri. Single egg sac. Stolon­bearing specimens collected from June to October ( Gidholm 1967).

Habitat. From shallow waters to 40 m, most common from 0– 5 m. Feeds on hydroids like Laomedea geniculata  , L. longissima  , and Lafoea  sp. ( Gidholm 1967).

Distribution. North East Atlantic.

Remarks. As already pointed out by Gidholm (1967), the name Myrianida prolifera  (as Autolytus prolifer  ) has been used for many different, inadequately determined species, but also for stolons of various taxa. Preserved specimens may be confused with a number of taxa, perhaps mostly with M. edwarsi  that occur in the same area. Synonymy of A. ehbiensis  is concluded from type material and from the original description, but some of the syntypes belong to M. brachycephala  . See also remarks for M. brachycephala  , and M. edwarsi  .

MNHN

Museum National d'Histoire Naturelle

DNA

Department of Natural Resources, Environment, The Arts and Sport

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Syllidae

Genus

Myrianida

Loc

Myrianida prolifera ( O .F. Müller, 1788 )

Nygren, Arne 2004

2004
Loc

Autolytus ehbiensis

Fauvel 1923: 314
McIntosh 1910: 243
Saint-Joseph 1887: 228

1887
Loc

Nereis prolifera O .F. Müller, 1788 : 15

Muller 1788: 15

Loc

Autolytus prolifera

Grube 1850: 310

Loc

Myrianida prolifera

Quatrefages 1866: 63