Limits...
First fossil record of Discocephalinae (Insecta, Pentatomidae): a new genus from the middle Eocene of Río Pichileufú, Patagonia, Argentina.

Petrulevičius JF, Popov YA - Zookeys (2014)

Bottom Line: The new species is the first fossil representative of the Discocephalinae.This taxon is extant in equatorial to subtropical America, and some species reach warm temperate latitudes (Buenos Aires province).The new genus is distinguished from the other genera of Discocephalini by the combination of these characters: interocular width greater than head length; head massive and quadrangular with the anterior margin almost straight; juga touching each other; labrum thick and curved; triangular ante-ocular process extending beyond the eye; broad spine-like antero-lateral process of the pronotum; pronotum explanate and bean shaped; scutellum triangular with a circular tongue reaching the anterior side of abdominal segment 7; and wings well developed with membrane just surpassing end of abdomen.

View Article: PubMed Central - HTML - PubMed

Affiliation: División Paleozoología Invertebrados, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n, La Plata (1900), and CONICET, Argentina.

ABSTRACT
A new genus and species of Discocephalini, Acanthocephalonotum martinsnetoi gen. n. et sp. n. is described from Río Pichileufú, middle Eocene of Patagonia, Argentina at palaeolatitude ~ 46°S. The new species is the first fossil representative of the Discocephalinae. This taxon is extant in equatorial to subtropical America, and some species reach warm temperate latitudes (Buenos Aires province). The new genus is distinguished from the other genera of Discocephalini by the combination of these characters: interocular width greater than head length; head massive and quadrangular with the anterior margin almost straight; juga touching each other; labrum thick and curved; triangular ante-ocular process extending beyond the eye; broad spine-like antero-lateral process of the pronotum; pronotum explanate and bean shaped; scutellum triangular with a circular tongue reaching the anterior side of abdominal segment 7; and wings well developed with membrane just surpassing end of abdomen.

No MeSH data available.


Photographs of habitus of extant genera of DiscocephaliniA-D specimens of Dryptochephala lurida Erichson, 1848 A female specimen, dorsal view, Tucumán, Argentina B male specimen without terminalia, ventral view, Loreto, Misiones, Argentina C detail of female abdomen in ventral view, Tucumán, Argentina, Gc8: gonocoxite 8, La8: laterotergite 8, La9: laterotergite 9 D detail male abdomen with pygophore in dorsal view, Iguazú, Misiones, Argentina E holotype of Glyphuchus sculpturatus Stål, 1858, female specimen, dorsal view “Rio Janeiro” (Stål, 1872), Brazil. Scale bars represent 2 mm.
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4109444&req=5

Figure 3: Photographs of habitus of extant genera of DiscocephaliniA-D specimens of Dryptochephala lurida Erichson, 1848 A female specimen, dorsal view, Tucumán, Argentina B male specimen without terminalia, ventral view, Loreto, Misiones, Argentina C detail of female abdomen in ventral view, Tucumán, Argentina, Gc8: gonocoxite 8, La8: laterotergite 8, La9: laterotergite 9 D detail male abdomen with pygophore in dorsal view, Iguazú, Misiones, Argentina E holotype of Glyphuchus sculpturatus Stål, 1858, female specimen, dorsal view “Rio Janeiro” (Stål, 1872), Brazil. Scale bars represent 2 mm.

Mentions: The specimen is a female in dorsal position albeit some ventral structures of head and genitalia are visible resulting in a composite view. Females of Discocephalinae are recognized by having external genital structures as laterotergites and gonocoxites (Fig. 3A, C). Laterotergites 8 are joined by a transverse band visible from the dorsal side (Fig. 3A), but this structure is not visible in the fossil specimen (Figs 1, 2). Males of recent representatives of the group have a pygophore that is easily lost, leaving the free posterior face of the seventh segment with three sides (Fig. 3B, D).


First fossil record of Discocephalinae (Insecta, Pentatomidae): a new genus from the middle Eocene of Río Pichileufú, Patagonia, Argentina.

Petrulevičius JF, Popov YA - Zookeys (2014)

Photographs of habitus of extant genera of DiscocephaliniA-D specimens of Dryptochephala lurida Erichson, 1848 A female specimen, dorsal view, Tucumán, Argentina B male specimen without terminalia, ventral view, Loreto, Misiones, Argentina C detail of female abdomen in ventral view, Tucumán, Argentina, Gc8: gonocoxite 8, La8: laterotergite 8, La9: laterotergite 9 D detail male abdomen with pygophore in dorsal view, Iguazú, Misiones, Argentina E holotype of Glyphuchus sculpturatus Stål, 1858, female specimen, dorsal view “Rio Janeiro” (Stål, 1872), Brazil. Scale bars represent 2 mm.
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4109444&req=5

Figure 3: Photographs of habitus of extant genera of DiscocephaliniA-D specimens of Dryptochephala lurida Erichson, 1848 A female specimen, dorsal view, Tucumán, Argentina B male specimen without terminalia, ventral view, Loreto, Misiones, Argentina C detail of female abdomen in ventral view, Tucumán, Argentina, Gc8: gonocoxite 8, La8: laterotergite 8, La9: laterotergite 9 D detail male abdomen with pygophore in dorsal view, Iguazú, Misiones, Argentina E holotype of Glyphuchus sculpturatus Stål, 1858, female specimen, dorsal view “Rio Janeiro” (Stål, 1872), Brazil. Scale bars represent 2 mm.
Mentions: The specimen is a female in dorsal position albeit some ventral structures of head and genitalia are visible resulting in a composite view. Females of Discocephalinae are recognized by having external genital structures as laterotergites and gonocoxites (Fig. 3A, C). Laterotergites 8 are joined by a transverse band visible from the dorsal side (Fig. 3A), but this structure is not visible in the fossil specimen (Figs 1, 2). Males of recent representatives of the group have a pygophore that is easily lost, leaving the free posterior face of the seventh segment with three sides (Fig. 3B, D).

Bottom Line: The new species is the first fossil representative of the Discocephalinae.This taxon is extant in equatorial to subtropical America, and some species reach warm temperate latitudes (Buenos Aires province).The new genus is distinguished from the other genera of Discocephalini by the combination of these characters: interocular width greater than head length; head massive and quadrangular with the anterior margin almost straight; juga touching each other; labrum thick and curved; triangular ante-ocular process extending beyond the eye; broad spine-like antero-lateral process of the pronotum; pronotum explanate and bean shaped; scutellum triangular with a circular tongue reaching the anterior side of abdominal segment 7; and wings well developed with membrane just surpassing end of abdomen.

View Article: PubMed Central - HTML - PubMed

Affiliation: División Paleozoología Invertebrados, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n, La Plata (1900), and CONICET, Argentina.

ABSTRACT
A new genus and species of Discocephalini, Acanthocephalonotum martinsnetoi gen. n. et sp. n. is described from Río Pichileufú, middle Eocene of Patagonia, Argentina at palaeolatitude ~ 46°S. The new species is the first fossil representative of the Discocephalinae. This taxon is extant in equatorial to subtropical America, and some species reach warm temperate latitudes (Buenos Aires province). The new genus is distinguished from the other genera of Discocephalini by the combination of these characters: interocular width greater than head length; head massive and quadrangular with the anterior margin almost straight; juga touching each other; labrum thick and curved; triangular ante-ocular process extending beyond the eye; broad spine-like antero-lateral process of the pronotum; pronotum explanate and bean shaped; scutellum triangular with a circular tongue reaching the anterior side of abdominal segment 7; and wings well developed with membrane just surpassing end of abdomen.

No MeSH data available.