Hesioninae Grube 1850
Creators: name: Salazar-Vallejo, Sergio I.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Phyllodocida
Hesionidae

description: Key to genera of Hesioninae Grube, 1850 fide Pleijel, 1998
(modif. Rizzo & Salazar-Vallejo 2014)
1 Prostomium with palps; median antennae present or absent.................................................... 2
- Prostomium without palps; median antennae absent; pharynx unarmed................ Hesione Savigny in Lamarck, 1818
2(1) Palps biarticulate; parapodia sesquiramous (with dorsal cirri but without notochaetae), or biramous.................... 3
- Palps simple; parapodia sesquiramous; median antenna absent......................... Elisesione Salazar-Vallejo, 2016
3(2) Pharynx unarmed; parapodia sesquiramous; neurochaetal blades bifid, without guards......... Dalhousiella McIntosh, 1901
- Pharynx with upper and lower jaws, sometimes upper one double; parapodia sesquiramous or biramous................. 4
4(3) Anterior chaetigers without notochaetae, middle and posterior ones biramous; neurochaetal blades often with guards...... 5
- All chaetigers sesquiramous; pharynx upper jaw double, T-shaped, lower jaw single, fang-shaped; neurochaetal blades bidentate, without guards................................................................ Leocratides Ehlers, 1908
5(4) Nuchal organs without lateral projections, sometimes projected posteriorly........................................ 6
- Nuchal organs L-shaped, lateral projections often extended beyond lateral prostomial margins........................ 9
6(5) Prostomial posterior region reduced, as long as, or smaller than anterior one; nuchal organs lobes horizontal C-shaped, never pigmented; pharynx with upper and lower jaws single, fang-shaped............................................. 7
- Prostomial posterior region projected posteriorly, often as long as prostomial anterior region, or longer than it, rarely wider distally (in too contracted specimens this region can be collapsed); nuchal organs lobes U-shaped, sometimes pigmented... 8
7(6) Neurochaetal blades bidentate, guards usually present; notochaetae from chaetiger 5, subdistally denticulate, denticles coarse or fine...................................................................... Leocrates Kinberg, 1866 restr.
- Neurochaetal blades unidentate, sometimes with guards surpassing main tooth; notochaetae from chaetiger 4, smooth......................................................................................... Paraleocrates n. gen.
8(6) Pharynx with upper jaw double, T-shaped, lower one transverse plate; neurochaetae often brownish........................................................................................... Dalhousia McIntosh, 1885 reinstated
- Pharynx with upper and lower jaws single, fang-shaped; sometimes with a circlet of round denticles; neurochaetae pale, not brownish........................................................................... Paradalhousia n. gen.
9(5) Pharynx with upper and lower jaws single, fang-shaped; peristomial dorsolateral and ventrolateral tubercles low, barely projected..................................................................... Lamprophaea Grube, 1867 reinst.
- Pharynx with upper jaw double, T-shaped, lower one a transverse plate; peristomial dorsolateral and ventrolateral tubercles projected........................................................................ Paralamprophaea n. gen.
description: Published as part of Salazar-Vallejo, Sergio I., 2020, Revision of Leocrates Kinberg, 1866 and Leocratides Ehlers, 1908 (Annelida, Errantia, Hesionidae), pp. 1-114 in Zootaxa 4739 (1) on page 20, DOI: 10.11646/zootaxa.4739.1.1, http://zenodo.org/record/3672547