Eosymtinae Bousfield & Hendrycks, 1994

Labay, Vjacheslav S., 2022, Review of amphipods of the family Pleustidae Buchholz, 1874 (Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). II. Subfamily Eosymtinae Bousfield & Hendrycks, 1994, Zootaxa 5125 (5), pp. 547-562 : 548

publication ID

https://doi.org/ 10.11646/zootaxa.5125.5.5

publication LSID

lsid:zoobank.org:pub:CEFAEE61-3A55-4AC4-BDF5-B0937F3B0FDC

DOI

https://doi.org/10.5281/zenodo.6457356

persistent identifier

https://treatment.plazi.org/id/DC0887DF-FFCF-FF57-259A-FF63FB8BFBF6

treatment provided by

Plazi

scientific name

Eosymtinae Bousfield & Hendrycks, 1994
status

 

Subfamily Eosymtinae Bousfield & Hendrycks, 1994 View in CoL

Eosymtinae Bousfield & Hendrycks 1994: 43 View in CoL .— Hendrycks & Bousfield 2004: 49.— Labay 2018: 221.

Type genus. Eosymtes Bousfield & Hendrycks, 1994: 43 View in CoL .— Hendrycks & Bousfield 2004: 49.

Type species. Eosymtes minutus Bousfield & Hendrycks, 1994 View in CoL

Genera. Eosymtes Bousfield & Hendrycks, 1994 View in CoL , Cognateosymtes Labay, 2018 View in CoL .

Diagnosis (from Hendrycks & Bousfield 2004 with additions). Body smooth. Urosome 2 occluded or not dorsally. Rostrum short.

Upper lip, apical lobes slightly asymmetric. Lower lip regular, inner lobes weak, narrowly sloped. Molar of both left and right mandibles columnar, with strongly ridged grinding surface, with medial molar plumose seta; left lacinia multidentate, right lacinia blade-like; row of raker setae short, with 4–7 pectinate blades; palp large. Maxilla 1, outer plate with 9 apical strong pectinate setae (spine-like setae), inner plate with 2 stout setae. Maxilla 2, inner plate with 2 strong submarginal and subapical setae. Maxilliped, inner plate with 2–4 small apical spiniform setae; palp segment 3 not produced distally, dactyl slender, slightly curved, not pectinated.

Gnathopods 1 & 2 medium, similar in form, carpus shorter than propodus, palmar margin oblique, without submedial tooth.

Pereopods 5–7, basis broadened, rounded behind, hind margin weakly serrate, basis 5 broadened in distal half, basis 6 and 7 broadened in proximal half. Epimeral plates 1–3, hind corners slightly acuminate, not produced. Telson keeled proximally, apex rounded.

Distribution. Marine waters of boreal part of Pacific Ocean.

Remarks. Subfamily Eosymtinae is close to Pleusymtinae Bousfield & Hendrycks, 1994 but differs from the latter as follows: lower lip, outer lobes slightly apart, inner lobes weak, narrowly sloped. Mandible, left and right molars with medial molar plumose seta; right lacinia present, blade-like. Maxilla 1, inner plate with two apical setae. Maxilla 2, inner plate with two marginal plumose setae. Maxilliped, inner plate with 2–4 small apical spiniform setae. Epimeral plates 1–3, posterior corners slightly acuminate, not produced.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Amphipoda

Family

Pleustidae

Loc

Eosymtinae Bousfield & Hendrycks, 1994

Labay, Vjacheslav S. 2022
2022
Loc

Eosymtinae

Labay, V. S. 2018: 221
Hendrycks, E. A. & Bousfield, E. L. 2004: 49
Bousfield, E. L. & Hendrycks, E. A. 1994: 43
1994
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