Anchylorhynchus

Last updated

Anchylorhynchus
Anchylorhynchus aegrotus.jpg
A. aegrotus (female)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Infraorder: Cucujiformia
Family: Curculionidae
Subfamily: Curculioninae
Tribe: Derelomini
Genus: Anchylorhynchus
Schönherr, 1836
Type species
Anchylorhynchus variabilis
Gyllenhal, 1836

Anchylorhynchus is a genus of weevils belonging the family Curculionidae and subfamily Curculioninae. It currently includes 25 described species distributed from Panama to Argentina. [1] [2] Members of the genus are pollinators of palms in the genera Syagrus , Oenocarpus and Butia , with adults living in inflorescences and larvae feeding on developing fruits. The first instar larvae of Anchylorhynchus have an unusual morphology, being specialized on killing other larvae infesting the palm fruits.

Contents

Adult morphology

Anchylorhynchus can be readily distinguished from other Derelomini by a number of features. [3] [4] The body is round, convex, and densely covered by scales varying from yellow to black. The rostrum is flattened dorso-verntrally at the apex, and exhibits 2-7 longitudinal grooves from the base of the rostrum to the insertion of antennae. The antennal funicle (segments excluding the first and the club) has only six segments, as opposed to seven segments in other genera. The antennae are inserted at the apex of the rostrum in both sexes, while it is inserted closer to the base in most other Curculionidae (at least in females).

Species of Anchylorhynchus are sexually dimorphic, with males usually being larger than females. In some species, males also have longer tarsi, and/or denser and longer hairs in the ventrites, metasternum and tarsi. In all described species, females have a retraction in ventrites III-IV of the abdomen. The shape and degree of retraction varies between species, but these segments are always flat in males.

Larval morphology and behavior

Cannibalism in Anchylorhynchus

Larvae of Anchylorhynchus go through 4 stages (instars) before molting into a pupa. The most distinctive stage is the first instar. First-instar larvae of Anchylorhynchus are unique in Curculionidae due to their falcate mandibles (usually found in insects that feed on other insects). Additionally, they are flattened dorso-ventrally, living between sepals and petals of female palm flowers. After hatching, larvae migrate to the base of the female flower, drilling a hole into the developing fruit. After entering the fruit, larvae molt and start consuming plant tissues, causing abortion of developing fruits. First- and second instar larvae attack and consume other larvae upon encountering them. Later instars avoid other larvae and are not aggressive. Starting on the second instar, larvae acquire the grub-like, cylindrical and C-shaped body characteristic of other Curculionidae. The mandible also changes its shape, becoming triangular and broad, adapted to crush plant tissues. [5]

Interaction with plants

Oviposition on palm flowers

Adults Anchylorhynchus visit male and female flowers of several palm species in the genera Syagrus , Oenocarpus and Butia . Anchylorhynchus minimus might be associated with Euterpe edulis , but this is still unconfirmed. [3] Adults use their rostrum to open male flowers and feed on pollen. While resting, they remain in the branches of the inflorescence or hidden at its base. Unlike most Curculionidae, females do not use the rostrum to drill an oviposition hole in plant tissues. Instead, they lay eggs directly between petals and sepals of female flowers. [5]

The first observation about natural history of Anchylorhynchus was published by Faust, who described A. burmeisteri from specimens collected from palms in Argentina. [6] Gregório Bondar made most of the subsequent observations, recording host plants for many species. He considered A. trapezicollis to be a pest of the palm known as licuri ( Syagrus coronata ). He observed that adults fed on pollen and conjectured that larvae might feed on flowers, even though he never observed them. More recently, the full life cycle of A. eriospathae has been described, showing that larvae feed on developing seeds and adults on pollen. [5] Also, species of Anchylorhynchus have been shown to be important pollinators of Oenocarpus bataua , Oenocarpus balickii, Oenocarpus minor, [7] Butia paraguayensis and Syagrus loefgrenii. [8]

Taxonomy

There are currently 25 valid species of Anchylorhynchus. [9]

The following list shows all valid species, with recognized synonyms shown indented:

Related Research Articles

<span class="mw-page-title-main">Longhorn beetle</span> Family of beetles characterized by long antennae

The longhorn beetles (Cerambycidae), also known as long-horned or longicorns, are a large family of beetles, with over 35,000 species described. Most species are characterized by extremely long antennae, which are often as long as or longer than the beetle's body. In various members of the family, however, the antennae are quite short and such species can be difficult to distinguish from related beetle families such as the Chrysomelidae. The scientific name of this beetle family goes back to a figure from Greek mythology: after an argument with nymphs, the shepherd Cerambus was transformed into a large beetle with horns.

<span class="mw-page-title-main">Curculioninae</span> Subfamily of beetles

The beetle subfamily Curculioninae is part of the weevil family Curculionidae. It contains over 23,500 described species in 2,200 genera, and is therefore the largest weevil subfamily. Given that the beetle order (Coleoptera) contains about one-quarter of all known organisms, the Curculioninae represent one of the – if not the – most successful radiations of terrestrial Metazoa.

<i>Syagrus</i> (plant) Genus of palms

Syagrus is a genus of Arecaceae (palms), native to South America, with one species endemic to the Lesser Antilles. The genus is closely related to the Cocos, or coconut genus, and many Syagrus species produce edible seeds similar to the coconut.

<span class="mw-page-title-main">Belidae</span> Family of beetles

Belidae is a family of weevils, called belids or primitive weevils because they have straight antennae, unlike the "true weevils" or Curculionidae which have geniculate (elbowed) antennae. They are sometimes known as "cycad weevils", but this properly refers to a few species from the genera Parallocorynus and Rhopalotria.

<i>Syagrus romanzoffiana</i> Species of palm

Syagrus romanzoffiana, the queen palm or cocos palm, is a palm native to South America, introduced throughout the world as a popular ornamental garden tree. S. romanzoffiana is a medium-sized palm, quickly reaching maturity at a height of up to 15 m (49 ft) tall, with pinnate leaves having as many as 494 pinnae (leaflets), although more typically around 300, each pinna being around 50 centimetres (18 in) in length and 3–5 centimetres (1–2 in) in width.

<i>Attalea</i> (plant) Genus of palms

Attalea is a large genus of palms native to Mexico, the Caribbean, Central and South America. This pinnately-leaved, non-spiny genus includes both small palms lacking an aboveground stem and large trees. The genus has a complicated taxonomic history, and has often been split into four or five genera based on differences in the male flowers. Since the genera can only be distinguished on the basis of their male flowers, the existence of intermediate flower types and the existence of hybrids between different genera has been used as an argument for keeping them all in the same genus. This has been supported by recent molecular phylogenies.

<i>Butia eriospatha</i> Species of palm

Butia eriospatha is a small species of Butia palm endemic to the highlands of southern Brazil. It is very similar to B. odorata, but is easily distinguished from this species by the distinct spathes which are densely covered in rust-coloured, woolly hairs. Indeed, the specific epithet is derived from Greek ἔριον, wool, and Latin spatha, which refers to the spathe. It has been given the name woolly jelly palm (UK) or wooly jelly palm (US) in English. Vernacular names for it where it is native are butiá-da-serra, butiázeiro, butiá-veludo, butiábutiá verdadeiro, butiá-do-campo, yatáy and macumá.

<i>Butia yatay</i> Species of palm

Butia yatay, the jelly palm or yatay palm, is a Butia palm native to southern Brazil, Uruguay and northern Argentina. It is known as the butiá-jataí in Portuguese in the south of Brazil, as well as simply jataí or butiá. It is sometimes cultivated as an ornamental in Europe and the United States. It is the tallest of all the species in the genus Butia. The fruit is edible with a sweet flavour.

<i>Rhynchophorus palmarum</i> Weevil pest of coconut-/date-/oil-palms

The South American palm weevil, Rhynchophorus palmarum, is a species of snout beetle. The adults are relatively large black beetles of approximately one and a half inch in length, and the larvae may grow to two inches in length.

<i>Sphenophorus</i> Genus of beetles

Sphenophorus is a genus of weevils, often known as billbugs, in the family Curculionidae, and tribe Sphenophorini. Eleven species of billbugs infest managed turfgrass in North America.

Sicoderus tinamus is a species of true weevil in the beetle family Curculionidae. It is found in North America.

<i>Sicoderus</i> Genus of beetles

Sicoderus is a genus of true weevils in the beetle family Curculionidae. There are more than 75 described species in Sicoderus.

<i>Butia odorata</i> Species of palm tree

Butia odorata, also known as the South American jelly palm, jelly palm, or pindo palm, is a Butia palm native to southernmost Brazil and Uruguay. This slow-growing palm grows up to 10m, although it is often less tall. It is identifiable by its feather palm pinnate leaves that arch inwards towards a thick stout trunk.

Butia microspadix is a very small species of grass-like Butia palm usually with an underground trunk; native to the states of Paraná and São Paulo in Brazil.

<i>Butia archeri</i> Species of palm

Butia archeri is a small species of Butia palm with a short trunk native to the states of Goiás, Brasília, Minas Gerais and São Paulo in Brazil.

<i>Oxyderces</i>

Oxyderces is a genus of broad-nosed weevils in the family Curculionidae distributed in South America. It can be recognized by the presence of dense setae on the apex of the rostrum and postocular setae.

References

  1. De Medeiros, Bruno A. S.; Vanin, Sergio A. (31 August 2020). "Systematic revision and morphological phylogenetic analysis of Anchylorhynchus Schoenherr, 1836 (Coleoptera, Curculionidae: Derelomini)". Zootaxa. 4839 (1): zootaxa.4839.1.1. doi:10.11646/zootaxa.4839.1.1. PMID   33056794. S2CID   222837392.
  2. Vanin, Sergio A.; Bená, Daniela C.; Chamorro, M. Lourdes. "Catálogo Taxonômico da Fauna do Brasil. PNUD" . Retrieved 22 December 2015.
  3. 1 2 de Medeiros, Bruno A. S. (2011). Análise filogenética e revisão sistemática do gênero Anchylorhynchus Schoenherr, 1836 (Curculionidae : Derelomini), com o uso de caracteres morfológicos contínuos e discretos (Master's thesis) (in Portuguese). Universidade de São Paulo.
  4. Vaurie, Patricia (1954). "Revision of the genera Anchylorhynchus and Petalochilus of the Petalochilinae (Coleoptera, Curculionidae)". American Museum Novitates (1651): 1–58. hdl:2246/2416.
  5. 1 2 3 de Medeiros, Bruno Augusto Souza; Bená, Daniela de Cássia; Vanin, Sergio Antonio (31 July 2014). "Curculio Curculis lupus: biology, behavior and morphology of immatures of the cannibal weevil Anchylorhynchus eriospathae G. G. Bondar, 1943". PeerJ. 2: e502. doi: 10.7717/peerj.502 . PMC   4121591 . PMID   25101231.
  6. Faust, Johannes (1894). "Russelkafer der alten und neuen Welt". Stettiner Entomologische Zeitung (in German). 55: 140–159.
  7. Núñez-Avellaneda, Luis Alberto; Isaza, Carolina; Galeano, Gloria (2015). "Ecología de la polinización de tres especies de Oenocarpus (Arecaceae) simpátricas en la Amazonia colombiana". Revista de Biología Tropical (in Spanish). 63 (1): 35–55. doi: 10.15517/rbt.v63i1.13030 . ISSN   0034-7744. PMID   26299114.
  8. Silberbauer-Gottsberger, Ilse; Vanin, Sérgio Antonio; Gottsberger, Gerhard (2013). "Interactions of the Cerrado Palms Butia paraguayensis and Syagrus petraea with Parasitic and Pollinating Insects". Sociobiology. 60 (3): 306–316. doi: 10.13102/sociobiology.v60i3.306-316 . ISSN   0361-6525.
  9. De Medeiros, Bruno A. S.; Vanin, Sergio A. (31 August 2020). "Systematic revision and morphological phylogenetic analysis of Anchylorhynchus Schoenherr, 1836 (Coleoptera, Curculionidae: Derelomini)". Zootaxa. 4839 (1): zootaxa.4839.1.1. doi:10.11646/zootaxa.4839.1.1. PMID   33056794. S2CID   222837392.