Four new species of Ampharetidae (Annelida: Polychaeta) from Pacific hot vents and cold seeps, with a key and synoptic table of characters for all genera Author Reuscher, Michael Author Fiege, Dieter Author Wehe, Thomas text Zootaxa 2009 2191 1 40 journal article 10.5281/zenodo.189379 7231732c-4a25-46ba-92ec-80a99040a6c9 1175-5326 189379 Glyphanostomum Levinsen, 1884 Type species: Samythella pallescens Théel, 1879 Generic diagnosis. Prostomium without glandular ridges. Buccal tentacles smooth. Three pairs of cirriform branchiae on one segment. Segment II without chaetae. Thorax with 14 chaetigers and 11 uncinigers. No modified segment. No abdominal rudimentary notopodia present. Table 5: Synoptic table of characters of all species of the genus Anobothrus (Data taken from original descriptions, Jirkov (in press), and own observations. Abbreviations: C: chaetae, E: elevated notopodia, R: glandular ridge between notopodia, S: prolonged segments, TU: thoracic unciniger) A. antarcticus A. apaleatus A. bimaculatus A. glandularis A. gracilis A. laubieri A. nasuta Monro, sp. nov. Fauchald, ( Hartmann- (Malmgren, (Desbruyères, (Ehlers, 1939 1972 Schröder, 1965 ) 1866) 1978) 1887) Buccal papillose papillose smooth smooth smooth smooth smooth tentacles
Chaetae on segment II - - + + + + +
Pairs of branchiae 4 4 4 4 4 3 4
Thoracic chaetigers 16 15 15 15 16 16 15
Thoracic uncinigers 12 12 11 12 12 12 12
Position of circular band Position of modificati on Kind of modificati on TU 3 TU 8 E, R, C TU 2 TU 8 E, R ? TU 6 C TU 3 TU 8 E, R, C TU 3 TU 8 E, R, C TU 2 TU 8 E, R, C ? TU 7 – 12 S
Abdomina l segments 12 12 ? 12 13–16 12 ?
Table 5: Synoptic table of characters of all species of the genus Anobothrus (continued) Table 6: Diagnostic characters of all genera with dorsal thoracic modifications (Abbrevations: AS : abdominal segments, NTP: notopodia, TC: thoracic chaetiger, TU: thoracic unciniger)
A. mancus Fauchald, 1972 A. paleatus Hilbig, 2000 A. patagonicus (Kinberg, 1866) A. pseudoampharete Schüller, 2008 A. sp. 1 Jirkov, in press A. sp. 2 Jirkov, in press A. sp. 3 Jirkov, in press
Buccal smooth tentacles smooth smooth smooth smooth smooth smooth
Chaetae on + segment II + + + + + +
Pairs of 4 branchiae 4 4 4 4 4 4
Thoracic 14 chaetigers 15 16 15 16 16 15
Thoracic 11 uncinigers Position of circular ? band Position of modificatio TU 7 n Type of modificatio R, C n 12 TU 3 TU 9 E, R, C 12 TU 1 TU 8 E, R, C 12? TU 8 E, R, C 12 TU 3 TU 8 E, R, C 12 TU 3 TU 8 E, R, C 12 TU 3 TU 9 E, R, C
Abdominal ? segments 12–13 15–18 15 11–12 12 12
Anobothrus Levinsen, 1884 Eclysippe Eliason, 1955 Jugamphicteis Fauchald & Hancock, 1981 Melinnampharete Annenkova, 1937 Mugga Eliason, 1955 Muggoides Hartman, 1965
Thoracic chaetigers 14–16 16 18 14–16 13 14
Thoracic uncinigers 11–12 12 14 10–12 9 10
Prostomial glandular ridges — — + — — —
Chaetae on segment II + / — + + + + —
Pairs of branchiae 3–4 3 4 3 3 3
Elevated notopodia optional 4th– or 5th TU from last — — — last TU last TU
Dorsal ridge optional 4th or 5th TU from last. 1., 2nd or 3rd TU with circular band — — TC 3, 4 or 5 — —
Modified notochaetae optional 4th, 5th or 6th TU from last — — — last TU last TU
Modified notopodia — 5 posteriormost NTPs lobed rudimentary NTPs of 1st AS fan-shaped — last pair of NTPs broadened last pair of NTPs broadened
Table 6: Diagnostic characters of all genera with dorsal thoracic modifications (continued) Remarks to Table 6:
Neosamytha Hartman, 1967 Sosane Malmgren, 1866 Sosanella Hartman, 1965 Sosanopsis Hessle, 1917 Ymerana Holthe, 1986 Zatsepinia Jirkov, 1986
Thoracic chaetigers 15 16 15 15 13 2 12
Thoracic uncinigers 12 12 13 12 10 2 10
Prostomial glandular ridges — — — — — —
Chaetae on segment II + + — — — —
Pairs of branchiae 3 4 4 1 4 3 2
Elevated notopodia — 3rd TU from last 3rd TU from last 3rd TU from last — 2nd TU from last
Dorsal ridge TC 4 3rd TU from last — 3rd TU from last & optional 4th TU from last — 2nd TU from last
Modified notochaetae — 3rd TU from last 3rd TU from last 3rd TU from last — —
Modified notopodia — 3rd TU from last broadened 3rd TU from last broadened 3rd TU from last broadened rudimentary NTP of 1st AS fan- shaped 2 —
The Table lists all genera with dorsal modifications of certain segments. Besides information concerning modifications and their position, the most important diagnostic characters are given. Some misinterpretations that have accumulated in literature are noted here. The erroneous data is due to non-uniform or incorrect terminology. Thus, there are confusions between segments, chaetigers, and uncinigers. Another problem lies in the fact whether segment II with chaetae formed as paleae are counted as chaetigers or not. In the section "Problems in the systematics of Ampharetidae ", suggestions are given to improve this situation. 1: Inconsistent data is given by Hartman (1965) in the original description of the monotypic genus Sosanella and its species Sosanella apalea Hartman, 1965 . In the generic diagnosis she indicates three pairs of branchiae. A number which is also given by Fauchald (1977) and Holthe (1986a) . In the species description, however, she describes in detail how the four (!) pairs of branchiae are arranged. To clarify this contradiction, type material must be examined. Because of the detailed description of the branchial arrangement, that reads: "Branchiae number four pairs; three pairs are inserted in a short, straight, slightly elevated row, leaving a wide medial space; the fourth pair is farther back, inserted above and behind the first notopodia", we consider a preliminary correction of the branchial number to four as appropriate. 2: In the original description of Ymerana pteropoda Holthe, 1986 the author traces the fan-shaped structure of the first abdominal segment back to modified notopodia without chaetae. He denies the presence of abdominal rudimentary notopodia, and considers this segment as a thoracic one. However, notopodial structures without chaetae are rudimentary per definition. Thus, there is one pair of abdominal rudimentary notopodia and the number of thoracic chaetigers ought to be 13 instead of 14.