Epigamia magna (Berkeley 1923) Berkeley 1923
- Dataset
- Revision of Autolytinae (Syllidae: Polychaeta).
- Rank
- SPECIES
- Published in
- Nygren, Arne (2004): Revision of Autolytinae (Syllidae: Polychaeta). Zootaxa 680: 1-314, ISBN: 1-877354-52-X, DOI: 10.5281/zenodo.157809
Classification
- kingdom
- Animalia
- phylum
- Annelida
- class
- Polychaeta
- order
- Phyllodocida
- family
- Syllidae
- genus
- Epigamia
- species
- Epigamia magna
description
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.
diagnosis
Diagnosis. Large orange Epigamia with c. 40 – 50 equal teeth; large equal cirrophores, long unequal dorsal cirrostyles; large parapodia with dorsal part enlarged.
materials_examined
Material examined. Canada: holotype (female epitoke), USNM 32897, British Colombia, Departure Bay, swarming at surface, 23 Feb 1920. Russia: 3 syntypes of A. beringianus ZIL 1 / 21046, 2 spms ZIL 1 / 45576, ZIL 3 / 45577, Bering Strait, littoral, 1930 – 1931; 2 syntypes of A. catarinkae ZIL 2 / 21050, 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.