Megalostomis Chevrolat, 1836

Agrain, Federico A., Chamorro, Maria Lourdes, Cabrera, Nora, Sassi, Davide & Roig-Junent, Sergio, 2017, A comprehensive guide to the Argentinian case-bearer beetle fauna (Coleoptera, Chrysomelidae, Camptosomata), ZooKeys 677, pp. 11-88 : 35-39

publication ID	https://dx.doi.org/10.3897/zookeys.677.10778
publication LSID	lsid:zoobank.org:pub:1C3D9A99-7A4C-443F-B228-CEA383A2D72F
persistent identifier	https://treatment.plazi.org/id/92AA8724-34D3-0915-FF60-A63EAF8EB28C
treatment provided by	ZooKeys by Pensoft
scientific name	Megalostomis Chevrolat, 1836
status

Treatment

Megalostomis Chevrolat, 1836 View in CoL Fig. 19

Megalostomis Chevrolat 1836: 416; Lacordaire 1848: 519; Blanchard 1851: 534; Chapuis 1874: 135; Gemminger and Harold 1874: 3294; Jacoby 1876: 809, 1880: 29; Horn 1892: 10; Jacoby and Clavareau 1906: 58; Clavareau 1913: 74; Bruch 1914: 348; Guérin 1943: 9; Monrós 1953a: 61, 1953b: 46; Moldenke 1970: 14, 1981: 99.

Megalostomis (Megalostomis) Chevrolat 1836: 416; Lacordaire 1848: 534; Chapuis 1874: 137; Jacoby and Clavareau 1906: 59; Guérin 1943: 15; Monrós 1953a: 71; Moldenke 1970: 19, 1981: 100.

= Megalostomis (Minturnia) Lacordaire 1848: 520; Chapuis 1874: 136; Jacoby and Clavareau 1906: 60; Guérin 1943: 11; Monrós 1953a: 62; Moldenke 1970: 19, 1981: 100; Agrain and Roig-Juñent 2011: 672, 695 (SYN).

= Megalostomis (Heterostomis) Lacordaire 1848: 554; Chapuis 1874: 138; Jacoby and Clavareau 1906: 60; Guérin 1943: 27; Monrós 1953a: 78; Agrain and Roig-Juñent 2011: 672, 695 (SYN).

= Megalostomis (Scaphigenia) Lacordaire 1848: 547; Chapuis 1874: 137; Jacoby and Clavareau 1906: 60; Clavareau 1913: 75; Achard 1926: 148; Guérin 1943: 24; Monrós 1953a: 88; Seeno and Wilcox 1982: 33; Agrain et al. 2007: 340; Agrain and Roig-Juñent 2011: 672, 695 (SYN).

= Megalostomis ( Pygidiocarina ) Moldenke 1970: 26, 1981: 83; Agrain and Roig-Juñent 2011: 672, 695 (SYN).

= Megalostomis (Coleobyersa) Moldenke 1981: 101; Agrain and Roig-Juñent 2011: 672, 695 (SYN).

= Megalostomis (Snellingia) Moldenke 1981: 101; Agrain and Roig-Juñent 2011: 672, 695 (SYN).

Type species.

Clythra boopis (Germar, 1824) [= Megalostomis grossa ( Forsberg 1821)], subsequent designation by Monrós 1953b: 46.

Diagnosis.

Among the species of Megalostomis , several morphological differences exist and the head and thorax are highly variable, therefore, the most useful morphological characters are: presence of a carina in the inter-ocular area, development of anterior teeth on the mandibles, clypeus sculpture, and the degree of retraction of the head inside the prothorax. The thorax may have strong constrictions, which are often present in those species showing great development of the head and mouthparts. The elytra are also variable; the most distinctive characters are the coloration pattern and the ordering of the elytral punctation. Although also variable, the abdomen and legs are not especially useful for the recognition of species groups. The pygidium may possess distinct sculpture patterns, which are useful to diagnose among species.

Distribution.

Megalostomis distribution includes North, Central and South America, especially diverse in xeric temperate or subtropical zones.

Remarks.

This genus was revised by Agrain (2013). Megalostomis now includes 43 species ( Agrain 2014), 13 of them present in Argentina. According to Agrain and Roig-Juñent (2011) this genus is supported by two synapomorphies: eyes strongly emarginated and dorsal plate of aedeagus with straight margin. The morphology in the genus is highly variable, especially for sexual dimorphic features such as: a greater development of mandibles, the presence of constrictions on the pronotal disc, development of double infraocular projection and lengthening of forelegs ( Agrain 2013).

Argentinian species checklist.

1. Megalostomis analis (Forsberg, 1821) (COR, CTS, FOR, MNS, SEO).

= Clythra analis Forsberg, 1821.

= Clythra bicincta Germar, 1824.

= Megalostomis bicincta Germar 1824.

Megalostomis (Heterostomis) analis : Lacordaire, 1848.

= Megalostomis (Heterostomis) analis var seminigra Achard, 1926.

= Megalostomis (Heterostomis) analis var lateralis Achard, 1926.

2. Megalostomis consimilis Achard, 1926 (CAT, CHA, COR, CTS, FOR, JUY, LRA, MZA, SAL, SEO, SLS, TUC). Host plants: Fabaceae : Prosopis algarrobilla ( Roig-Juñent 2004), Prosopis affinis ( Roig-Juñent 2004), Prosopis sp. ( Viana and Williner 1974).

Megalostomis (Scaphigenia) consimilis : Agrain et al., 2007.

= Megalostomis (Scaphigenia) cornuta Monrós, 1945 (nec Lacordaire, 1848).

Megalostomis (Scaphigenia) cornuta consimilis: Monrós 1956a.

3. Megalostomis cornuta Lacordaire, 1848 (COR, SAL, SEO).

= Megalostomis cornuta Dejean, 1836 (nomen nudum).

Megalostomis (Scaphigenia) cornuta Lacordaire, 1848.

= Megalostomis (Scaphigenia) cornuta var. baeri Achard, 1926.

= Megalostomis (Scaphigenia) cornuta var. obliterate Achard 1926.

= Megalostomis (Scaphigenia) cornuta var. divisa Guérin, 1949.

4. Megalostomis gazella Lacordaire, 1848 (CAT, CHA, COR, CTS, ERS, FOR, JUY, LPA, LRA, MNS, MZA, SAL, SEO, SFE, SJN, SLS, TUC). Host plants: Fabaceae : Prosopis sp.; Acacia sp. ( Monrós 1953a); Prosopis caldenia (Aravena 1974), Prosopis flexuosa ( Roig-Juñent 2004). Ant hosts: Colonies of Camponotus sp. ( Monrós 1953a, as Dr. Oblobin pers. comm.)

Megalostomis (Scaphigenia) gazella Lacordaire, 1848.

= Megalostomis (Scaphigenia) gazella var. clavapex Achard, 1926.

= Megalostomis (Scaphigenia) gazella var. flavapex : Monrós, 1953a (misspelling pro clavapex).

= Megalostomis (Scaphigenia) gazella var. nigrapex Achard, 1926.

= Megalostomis (Scaphigenia) gazella var. nigrescens Achard, 1926.

= Megalostomis meretrix Lacordaire, 1848.

= Megalostomis bicingulata Lacordaire, 1848.

5. Megalostomis grossa (Forsberg, 1821) (COR, CTS, FOR, JUY, MNS).

= Clythra grossa Forsberg, 1821.

= Clythra boopis Germar, 1824.

= Megalostomis boopis : Dejean, 1836.

= Megalostomis interrupta Dejean, 1836 (nomen nudum).

Megalostomis (Megalostomis) grossa Lacordaire, 1848.

= Megalostomis (Megalostomis) grossa brasiliana Achard, 1926.

= Megalostomis (Megalostomis) grossa cinctipennis Achard, 1926.

= Megalostomis grossa var. boopis Achard, 1926.

= Megalostomis grossa var. quadrimaculata Achard, 1926.

6. Megalostomis kollari Lacordaire, 1848 (COR, MNS).

Megalostomis (Scaphigenia) kollari Lacordaire, 1848.

7. Megalostomis lacordairei Lacordaire, 1848 (CAT, CHA, CTS, FOR, LRA, MNS, MZA, SAL, SEO, SFE, SJN, SLS, TUC). Host plants: Fabaceae ( Monrós 1953a) Cercidium praecox (Brea); Prosopis sp.; Geoffroea decorticans ( Chañar) ( Viana and Williner 1974); Acacia caven (Mol.) Mol. ( Viana and Williner 1974); Senna aphylla ( Agrain and Marvaldi 2009); Prosopis sp. and Verbenaceae ( Cordo and DeLoach 1995): Aloysia gratissima . Zygophyllaceae : Bulnesia retama (Common name in Argentina: Retamo, in Peru: Calato).