Paraleocrates, Salazar-Vallejo, 2020

Salazar-Vallejo, Sergio I., 2020, Revision of Leocrates Kinberg, 1866 and Leocratides Ehlers, 1908 (Annelida, Errantia, Hesionidae), Zootaxa 4739 (1), pp. 1-114 : 104

publication ID

https://doi.org/ 10.11646/zootaxa.4739.1.1

publication LSID

lsid:zoobank.org:pub:544B9C82-BF33-4EA1-9411-E1A307137466

DOI

https://doi.org/10.5281/zenodo.3680189

persistent identifier

https://treatment.plazi.org/id/2D1987E4-FF84-734B-FF23-FF6CF0C26274

treatment provided by

Plazi

scientific name

Paraleocrates
status

gen. nov.

Paraleocrates View in CoL n. gen.

urn:lsid:zoobank.org:act:6B2BD422-D82C-4FC3-906F-362A99856461

Type species. Leocrates wesenberglundae Pettibone, 1970 View in CoL .

Diagnosis. Hesioninae with two lateral antennae, and one median antenna on dorsal prostomial surface. Palps biarticulate, palpophores large, massive, palpostyles smaller, blunt. Eyes dark, black or brown, anterior ones larger than posterior ones, distant to each other in lateral view. Nuchal organs lobes horizontal C-shaped, posterior ciliated bands close to each other. Pharynx with single, fang-shaped upper and lower jaws. Parapodia sesquiramous along a few anterior chaetigers, biramous thereafter. Notochaetae from chaetiger 4, smooth, delicate, sometimes abundant, size variable, never as long as to reach neurochaetal tips. Neurochaetae compound falcigers, blades unidentate, guards, if present, aristate, surpassing distal tooth.

Etymology. The genus-group name is derived from Leocrates , by adding the Greek prefix para- to indicate its close similarity to the stem genus-group name.

Gender. Masculine, as in the stem genus-group name.

Remarks. Paraleocrates n. gen. resembles Leocrates Kinberg, 1866 by having C-shaped nuchal organs lobes, and single, fang-shaped upper and lower jaws in their pharynx. They differ in three features: the start of notochaetae, the surface of notochaetae, and the type of neurochaetal blades. In Paraleocrates notochaetae start in chaetiger 4, their surface is smooth, and neurochaetal blades are unidentate, sometimes with guards surpassing the denticle, whereas in Leocrates notochaetae start from chaetiger 5, they are subdistally spinulose, and neurochaetal blades are bidentate. There are only two species in this genus that can be separated with the key below.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Hesionidae

GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF