Oxarthrius escharus Park, 1942

Chandler, Donald S., 2013, Further Notes on the New World Pselaphinae (Coleoptera: Staphylinidae) Described by Victor Motschulsky, The Coleopterists Bulletin 67 (3), pp. 321-327 : 323-324

publication ID

https://doi.org/ 10.1649/0010-065X-67.3.321

persistent identifier

https://treatment.plazi.org/id/03ED87BA-FFFB-FFE7-8C61-F9AEB416FA48

treatment provided by

Diego

scientific name

Oxarthrius escharus Park, 1942
status

 

Oxarthrius escharus Park, 1942 View in CoL

Batrisus rivularis Schaufuss 1874: 285 View in CoL (not Batrisus rivularis Motschulsky, 1855 View in CoL ). C. Schaufuss 1888: 16. Type locality: Obispo, Panama. Holotype female examined [MNHP], // Panama / Museum Paris 1917 Coll. A. Raffray/ TYPE [red label]/ rivularis A. Raffray View in CoL det.//. New synonymy.

Batrisus (Oxarthrius) rivularis: Raffray 1898: 438 View in CoL .

Oxarthrius rivularis (Schaufuss) View in CoL : Raffray 1904: 77, 1908: 154, 1911: 59; Park 1942: 246; Blackwelder 1944: 92.

Oxarthrius rivularis (Motschulsky) View in CoL : Chandler 1992: 348.

Oxarthrius (Baroxarthrius) escharus Park 1942: 244 View in CoL . Type locality: Barro Colorado Island, Gatun Lake, Panama. Chandler 1992: 348. Holotype male examined [FMNH].

Comments. Batrisus rivularis Schaufuss, 1874 is a primary junior homonym of B. rivularis Motschulsky, 1855 . Both names resided in the genus Batrisus until Raffray (1904) treated Oxarthrius at the generic level. This conflict extended past 1900, and a replacement name is needed. There is an available name based on the synonymy established here. Park (1942) described O. escharus from Panama, and designated it as the type species of his new subgenus Baroxarthrius Park. Members of this subgenus lack basal elytral foveae, while members of the nominate subgenus have a single basal fovea on each elytron, and the locations of the male characters are different. The holotype female of B. rivularis Schaufuss is clearly a member of the subgenus Baroxarthrius , and with the exception of the sexual characters it is similar to a male specimen identified as and compared with the holotype male of O. escharus by myself in 2000. The sculpturing of the body, antennal proportions, indistinctness of the antennal club, and elevation and density of the setae are similar, with the antennal proportions being slightly shorter — a common feature when comparing males and females of the same species.

Members of this subgenus are uncommon in the Panama Canal area, with only one species ( O. escharus ) being present in my extensive material from Panama, while this subgenus is diverse in Costa Rica. The two names are here synonymized, and the available name Oxarthrius escharus Park is selected as the replacement name for Batrisus rivularis Motschulsky. A female specimen from Refugio Nacional de Vida Silvestre Gandoca-Manzanillo in Costa Rica, a near sea-level site close to the border with Panama, compares favorably with the female holotype of B. rivularis and has been so labeled.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Oxarthrius

Loc

Oxarthrius escharus Park, 1942

Chandler, Donald S. 2013
2013
Loc

Oxarthrius rivularis (Motschulsky)

Chandler 1992: 348
1992
Loc

Oxarthrius (Baroxarthrius) escharus

Chandler 1992: 348
Park 1942: 244
1942
Loc

Oxarthrius rivularis (Schaufuss)

Blackwelder 1944: 92
Park 1942: 246
Raffray & Pselaphidae & Coleopterorum Catalogus 1911: 59
Raffray 1908: 154
Raffray 1904: 77
1904
Loc

Batrisus (Oxarthrius) rivularis:

Raffray & Revision des Batrisus et genres voisins de l' Amerique centrale et meridionale & Annales de la Societe Entomologique de France 1898: 438
1898
Loc

Batrisus rivularis

Schaufuss 1888: 16
Schaufuss 1874: 285
1874
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