ACANTHOSOMATIDAE Signoret, 1863

Grazia, Jocelia, Schuh, Randall T. & Wheeler, Ward C., 2008, Phylogenetic relationships of family groups in Pentatomoidea based on morphology and DNA sequences (Insecta: Heteroptera), Cladistics 24, pp. 932-976 : 969-970

publication ID

https://doi.org/ 10.1111/j.1096-0031.2008.00224.x

DOI

https://doi.org/10.5281/zenodo.4334480

persistent identifier

https://treatment.plazi.org/id/03E187AB-6B70-FFF7-FC96-F88F10E84800

treatment provided by

Valdenar

scientific name

ACANTHOSOMATIDAE Signoret
status

 

ACANTHOSOMATIDAE Signoret

Historical: This predominantly Southern Hemisphere taxon includes three subfamilies: Acanthosomatinae ,

Blaudinae with two tribes Blaudini and Lanopini, and Ditomotarsinae, also with two tribes, Ditomotarsini and Laccophorellini ( Kumar, 1974). Froeschner (1999) emendedthe spelling of Blaudusinae Kumar to Blaudinae

and Blaudini because the higher-taxon name was based on Blaudus Stål ; we follow Froeschner̕s usage. In the cladistic analysis of Gapud (1991) the Acanthosomatidae is related to the Dinidoridae plus Tessaratomidae and Scutelleridae , coming out in a relatively basal position on the cladogram ( Fig. 1f View Fig ). Fischer (1994a,b), in a phylogenetic analysisof the family, stressed the monophyly of the Acanthosomatidae based on three non-homoplastic characters and one homoplastic character: (i) presence of Pendergrast̕s organ (abdominal disc organ), (ii) segment VIII in males visible (not concealed by segment VII), (iii) females with a special organ for symbiont transmission, and (iv) openings of anterior abdominal scent glands shifted laterad, a feature shared with the Scutelleridae . Fischer (2006) described the biological context and evolution of Pendergrast̕s organ in the Acanthosomatidae , presenting a surveyof these organsin more than 100 acanthosamatid species.

Analytical result: Our morphological and total evidence analyses ( Figs 42–44 View Fig View Fig View Fig and 51–55 View Figs 49–52. 49 View Fig View Fig View Fig , respectively) always resolve the Acanthosomatidae as monophyletic, a theory concordant with most prior work. Our taxon sample for DNA sequences is biased toward the Australian fauna and the subfamilies Acanthosomatinae and Blaudinae, although we did sequence Elasmostethus Fieber from the Northern Hemisphere, a member of the Acanthosomatinae . The position of the group within the Pentatomoidea is variable, depending on the data set being analysed. The morphological analyses treat the group as relatively basal ( Figs 42–44 View Fig View Fig View Fig ), whereas the molecular data always treat the group as closely associated with the Pentatomidae ( Figs 45 and 46 View Figs 45–48. 45 ), although sometimes with a small number of other taxa involved ( Fig. 45 View Figs 45–48. 45 ). The 52-taxon total evidence analyses ( Figs 51 and 52 View Figs 49–52. 49 ) place the Acanthosomatidae + Lestoniidae as the sister group of the Pentatomidae , in the case of 1: 1 cost ratio also including Thaumastella . The result of the 92-taxon analysis under a 1: 1 cost ratio ( Fig. 53 View Fig ) is similar to molecular and 52-taxon analyses, the 1: 2 cost ratio moves the Acanthosomatidae to a more basal position in the cladogram ( Fig. 54 View Fig ), and the 2: 2 costratioincludesthe Dinidoridae + Tessaratomidae as part of the Acanthosomatidae + Pentatomidae complex. Morphological characters supporting the monophyly of the Acanthosomatidae in both the morphological and 92-taxon total evidence analyses are the membranous abdominal tergite VIII in males (411) and the triangulin absent with a smooth intergonocoxal membrane between gonapophyses 8 (531). The 92-taxon total evidence analyses offer additional support from the obsolete claval commissure (172) and the claws with bristles (311).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hemiptera

Family

Acanthosomatidae

Loc

ACANTHOSOMATIDAE Signoret

Grazia, Jocelia, Schuh, Randall T. & Wheeler, Ward C. 2008
2008
Loc

Acanthosomatinae

Signoret 1863
1863