Pisoxylon, Menke, 1968

Muniz, David Barros & Melo, Gabriel A. R., 2021, A new species of the wasp genus Trypoxylon from southern Brazil, with notes on the systematics of Pisoxylon (Hymenoptera, Crabronidae), Papéis Avulsos de Zoologia (Pap. Avulsos Zool., S. Paulo) 61, pp. 1-7: 2

publication ID

http://doi.org/ 10.11606/1807-0205/2021.61.36

publication LSID

lsid:zoobank.org:pub:AC34FFF0-2099-4F13-A664-6F227BA81AD8

persistent identifier

http://treatment.plazi.org/id/03A34B3F-FD7A-FF98-6A85-FB06FC65FAC2

treatment provided by

Carolina

scientific name

Pisoxylon
status

 

Scope of Pisoxylon   and its status

in relation to Trypoxylon  

Considering the three species of Pisoxylon   recognized by Antropov (1998) in his revision, P. amenkei   and P. xanthosoma   are very close to each other morphologically, having many features in common. They differ from one another only by the length of the undivided part of the medial carina, the distance between the lateral ocellus and the corresponding inner eye margin, the thickness of the striations on the dorsal part of the propodeum and coloring of clypeal disc, the mesosoma, the metasoma and the silvery pubescence present in P. amenkei   against the golden pubescence in P.xanthosoma   .

On the other hand, P.roosevelti   differs from these two species in many aspects: metapleura dorsally with a dilated lamellar margin; a small incision in the inner margin of the mandible; medial lobe of clypeus nearly straight in frontal view, with short rectangular protrusion in females; supraclypeal area somewhat longer than wide; lower part of frons with short,entire medial carina; dorsal part of propodeum with fine punctation and short transverse striae along medial groove; lateral part of propodeum without punctation and pilosity; males with antennae modified, at least with the F4 and F8 somewhat thickened and excised beneath; entire mesosoma black.

Pisoxylon roosevelti   is very similar structurally to the new species described in the present work, T. basirufum   sp. nov. Many of the characters shared between P.roosevelti   and T. basirufum   sp. nov. are common to several Trypoxylon   s. str., like the dilated lamellar margin on the metapleura. This is one of the diagnostic characteristics of the fabricator group in Trypoxylon   s. str. In this group there are also species that have a compact abdomen combined with the absence of a propodeal lateral carina, for example, T. pachygaster Richards, 1934   . Also, in our phylogenetic study of Trypoxylon   sensu lato (Muniz and Melo, unpubl. data), we have found out that DNAsequence data from T. basirufum   sp. nov. group it with other species of Trypoxylon   s. str. and not with Pisoxylon amenkei   as expected on morphological ground. Based on this,we propose transferring P.roosevelti   to Trypoxylon   s. str., keeping only P. amenkei   and P. xanthosoma   in the genus Pisoxylon   .

Based on the above propositions, we reformulate the diagnosis of Pisoxylon   to the following characters: inner eye orbits deeply notched; antennal sockets not contiguous with frontoclypeal suture; supraclypeal area shorter than wide; mandibles simple, having neither ventral incision (or tooth), nor inner tooth; male F6-F8 with tyloids; occipital carina incomplete and connected to the hypostomal carina in males and females; metapleura dorsally without dilated protrusion; propodeum moderately elongate-oval, without specific preapical structures; dorsal field of propodeum not clearly outlined, with medial groove; lateral carinae of propodeum absent; female hind coxa with minute subapical tubercle ventrally; hind wing with single basal hook and 2 groups of 5(6) + 3hamuli, separated from each other by a distance about twice the length of the proximal group of hamuli; intercalary hooks absent; metasoma sessile, relatively short, with non-elongate segment I. This reformulated diagnosis is based also on the undescribed male of Pisoxylon amenkei   , obtained from trap nests in Paraná, Brazil (Muniz & Melo, unpubl. data).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Crabronidae

Loc

Pisoxylon

Muniz, David Barros & Melo, Gabriel A. R. 2021
2021
Loc

T. basirufum

Muniz & Melo 2021
2021
Loc

T. basirufum

Muniz & Melo 2021
2021
Loc

T. basirufum

Muniz & Melo 2021
2021
Loc

Pisoxylon roosevelti

Antropov 1998
1998
Loc

P.roosevelti

Antropov 1998
1998
Loc

Pisoxylon amenkei

Antropov 1998
1998
Loc

P.roosevelti

Antropov 1998
1998
Loc

P. amenkei

Antropov 1998
1998
Loc

Pisoxylon amenkei

Antropov 1998
1998
Loc

P. xanthosoma

Menke 1968
1968
Loc

Pisoxylon

Menke 1968
1968
Loc

Pisoxylon

Menke 1968
1968
Loc

T. pachygaster

Richards 1934
1934
Loc

Trypoxylon

Latreille 1796
1796
Loc

Trypoxylon

Latreille 1796
1796
Loc

Trypoxylon

Latreille 1796
1796
Loc

Trypoxylon

Latreille 1796
1796
Loc

Trypoxylon

Latreille 1796
1796