Epigamia magna ( Berkeley, 1923 )

Nygren, Arne, 2004, Revision of Autolytinae (Syllidae: Polychaeta)., Zootaxa 680, pp. 1-314: 173-174

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-CCDB-4E8D-FEE8-7B2D8A7C8725

treatment provided by

Plazi

scientific name

Epigamia magna ( Berkeley, 1923 )
status

comb. n.

Epigamia magna ( Berkeley, 1923)  comb. n. (Fig. 88 A –E)

Autolytus magnus Berkeley, 1923: 210  , pl. 1, fig. 3–4; Berkeley & Berkeley 1938: 47; 1948: 70, fig. 101; Hartman 1948: 24; Imajima & Hartman 1964: 93 –95, fig. 18 A –C; Imajima 1966: 40 –46, figs 9 A –F, 10 A –F, 11 A –D; Pettibone  1967: 5; Nygren & Sundberg 2003: GenBank sequences, 16 S rDNA partial sequence AF 474263View Materials, and 18 S rDNA partial sequence AF 474309View Materials. Autolytus beringianus Annenkova, 1934: 323  –324, fig. 2 A –B; Uschakov 1955: 173, fig. 57 D –E. Autolytus caterinkae Uschakov, 1950: 180  , fig. 17 A –B; 1955: 173, fig. 57 A –C;? Chlebovitch 1962: 173 –174.

? Autolytus  cf magnus  Fauchald 1977 b: 19.

Material examined. Canada: holotype (female epitoke), USNMAbout USNM 32897, British Colombia, Departure Bay, swarming at surface, 23 Feb 1920. Russia: 3 syntypes of A. beringianus  ZILAbout ZIL 1 /21046, 2 spms ZILAbout ZIL 1 / 45576, ZILAbout ZIL 3 / 45577, Bering Strait, littoral, 1930–1931; 2 syntypes of A. catarinkae  ZILAbout ZIL 2 / 21050, ZILAbout ZIL 3 / 21051, La Pérouse Strait, 56 m, 45 ° 40 ' 2 "N 141 ° 59 ' 2 "E, 28 Jun 1932. USA: 1 spm, Washington, San Juan Island, 48 ° 32.73 'N 123 °00.75'W, epifauna on floating dock outside Friday Harbor laboratory, sponges, hydroids, barnacles, Jan 2001.

Diagnosis. Large orange Epigamia  with c. 40–50 equal teeth; large equal cirrophores, long unequal dorsal cirrostyles; large parapodia with dorsal part enlarged.

Description. Length, in one live specimen, 22 mm for 69 chaetigers, width 1.1 mm, length in preserved specimens, 14–21 mm for 44–84 chaetigers, width 1.1–1.8 mm. Live specimens orange (Fig. 88 A) with 2 pale brownish bands of bacillary glands on each segment. Preserved specimens with bacillary glands showing as 2 transverse rows of brown on each segment, and as 2 longitudinal bands running along dorsal and ventral surface of all appendages (Fig. 88 B). Ciliation as 2 trochs per segment.

Eyes confluent (Fig. 88 A); eye spots absent. Palps in dorsal view projecting 1 / 3 – 1 / 2 of prostomial length (Fig. 88 A). Extension of nuchal epaulettes from end of chaetiger 3 to end of chaetiger 4 (Fig. 88 A).

Median antenna reaching chaetiger 13 in live specimen (n= 1). Lateral antennae and dorsal tentacular cirri, length c. 2 / 3 of median antenna. Ventral tentacular cirri 1 / 3 – 1 / 2 as long as dorsal pair. First dorsal cirri as long as median antenna, second dorsal cirri as long as ventral tentacular cirri. From chaetiger 1–27 cirri with usual alternation in direction, more posterior not possible to assess due to lost cirri. Dorsal cirri from chaetiger 3, alternate in length (Fig. 88 A); short cirri equals body width, long cirri slightly longer than body width. Cirrophores present on tentacular cirri, and all dorsal cirri. Cirrophores equal, cirrostyles unequal; short cirrostyles 4 / 5 in length of long cirrostyles; cirrophores equal or slightly shorter than parapodial lobes (Fig. 88 A); cirrophores shorter than cirrostyles. All appendages cylindrical.

Parapodial lobes very large, swollen dorsal to chaetigers lobe. Anterior chaetigers with 3–5 aciculae, 2–3 in median and posterior. Chaetal fascicle with up to 50 compounds in anterior chaetigers, 15–30 in median and posterior. Compound chaetae with large distal tooth (Fig. 88 D, E); serration present. Single thin bayonet chaetae, beginning between chaetigers 40–50.

Pharynx with long sinuation anterior and lateral to proventricle. Trepan in chaetiger 1– 4, number and size of teeth not possible to assess. Proventricle equal in length to 5–6 segments in chaetiger 11–16 with 41–50 rows of muscle cells. Anal cirri equal in length to c. body width.

Additional information. Annenkova (1934), and Imajima (1967), gives information on the trepan; there are about 46–50 equal teeth, arranged in what appears to be 1 ring.

Reproduction. Epigamy.

USNM

Smithsonian Institution, National Museum of Natural History

ZIL

Academy of Sciences, Zoological Institute

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Syllidae

Genus

Epigamia

Loc

Epigamia magna ( Berkeley, 1923 )

Nygren, Arne 2004

2004
Loc

Autolytus

Fauchald 1977: 19

1977
Loc

Autolytus magnus

Pettibone 1967: 5
Imajima 1966: 40
Imajima 1964: 93
Chlebovitch 1962: 173
Uschakov 1955: 173Uschakov 1950: 180
Hartman 1948: 24
Berkeley 1938: 47Annenkova 1934: 323Berkeley 1923: 210

1938