Tag Archives: insects

Badass females are unpopular among praying mantids

by Piter Kehoma Boll

One of the most iconic representations of praying mantids is that of a female eating the male after (or during) sex, an unpleasant scenario that starts with a beheading before the poor male even finishes his job.

Mantismeal

Delicious male meal. Photo by Wikimedia user Classiccardinal.*

According to some studies, when the male is beheaded, he increases the pumping of semen into the female, thus increasing the chances of fecundation. This could make one think that being eaten is actually an advantage to the male, as it makes him have more offspring.

Several observations with different species show the opposite though. Males make everything they can to avoid being eaten by the female, as it allows them to copulate with additional females. But how can they escape from such a gruesome destiny?

It is known that hungry females are more eager to eat the partner than satiated ones. Well-fed females (fat ones) are also less likely to have a meal in bed than malnourished ones. Males can tell whether a female is hungry or malnourished and thus avoid those in such conditions. They like fat and fed females. But this is not the only thing that males take into account when choosing the appropriate mother for their children.

A study from 2015 by researchers of the University of Buenos Aires have shown that males of the species Parastagmatoptera tessellata, found in South America, also choose females based on their personality.

In a laboratory experiment, a male was put in a container where he could see two females, one aggressive and one non-aggressive. Another male was presented to both females (which were unable to see each other) and the aggressive female always attacked the male, while the non-aggressive one never did. After watching how each female behaved, the male received access to both and could choose his favorite one.

And guess what? The non-aggressive one was chosen most of the time. This means that males are not only able to tell whether they are likely to be eaten based on the female’s hunger and nutritional condition, but also by analyzing the behavior of the female towards other males.

See also:

Gender conflict: Who’s the man in the relationship?

Male dragonflies are not as violent as thought

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ResearchBlogging.orgReferences:

Lelito, J., & Brown, W. (2008). Mate attraction by females in a sexually cannibalistic praying mantis Behavioral Ecology and Sociobiology, 63 (2), 313-320 DOI: 10.1007/s00265-008-0663-8

Scardamaglia, R., Fosacheca, S., & Pompilio, L. (2015). Sexual conflict in a sexually cannibalistic praying mantid: males prefer low-risk over high-risk females Animal Behaviour, 99, 9-14 DOI: 10.1016/j.anbehav.2014.10.013

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Filed under Behavior, Entomology, Zoology

New Species: March 1 to 10

by Piter Kehoma Boll

Here is a list of species described from March 1 to March 10. It certainly does not include all described species. Most information comes from the journals Mycokeys, Phytokeys, Zookeys, Phytotaxa, Zootaxa, International Journal of Systematic and Evolutionary Microbiology, and Systematic and Applied Microbiology, as well as journals restricted to certain taxa.

Pristimantis_attenboroughi

Pristimantis attenboroughi is a new frog species described in the past 10 days and named in honor of Sir David Attenborough.

SARs

Plants

Fungi

Sponges

Entoprocts

Annelids

Kinorhynchs

Nematomorphs

Nematodes

Arachnids

Myriapods

Crustaceans

Hexapods

Ray-finned fishes

Lissamphibians

Reptiles

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Filed under Systematics, taxonomy

New Species: February 21 to 28

by Piter Kehoma Boll

Here is a list of species described from February 21 to February 28. It certainly does not include all described species. Most information comes from the journals Mycokeys, Phytokeys, Zookeys, Phytotaxa, Zootaxa, International Journal of Systematic and Evolutionary Microbiology, and Systematic and Applied Microbiology, as well as journals restricted to certain taxa.

nyctibatrachus_manalari

Nyctibatrachus manalari is a new tiny frog described in the past 8 daysdescribed in the past 8 days.

Bacteria

Plants

Fungi

Sponges

Annelids

Nematods

Arachnids

Crustaceans

Hexapods

Cartilaginous fishes

Ray-finned fishes

Lissamphibians

Mammals

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Filed under Systematics, taxonomy

New Species: November 1 to 10

by Piter Kehoma Boll

Here is a list of species described from November 1 to  November 10. It certainly does not include all described species. Most information comes from the journals Mycokeys, Phytokeys, Zookeys, Phytotaxa, Zootaxa, International Journal of Systematic and Evolutionary Microbiology, and Systematic and Applied Microbiology, as well as journals restricted to certain taxa.

dendronotus_robilliardi

The sea slug Dendronotus robilliardi is a new species described in the past 10 days.

Archaeans

Bacteria

SARs 

Plants

Fungi

Sponges

Cnidarians

Entoprocts

Mollusks

Annelids

Loriciferans

Mud Dragons

Nematodes

Arachnids

Crustaceans

Hexapods

Echinoderms

Cartilaginous fishes

Ray-finned fishes

Lissamphibians

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Filed under Systematics, taxonomy

Friday Fellow: Sun Beetle

ResearchBlogging.orgby Piter Kehoma Boll

Who says beetles cannot be cute? Take a look at those guys:

pachnoda_marginata

They are eating a piece of banana. Photo by Wikimedia user Evanherk.*

These little fellows are beetles of the species Pachnoda marginata, commonly known as sun beetle or taxi cab beetle. Native from Africa, they reach up to 30 mm as adults and 60 mm as larvae and are one of the most common beetles raised as pets.

pachnoda_marginata_peregrina

An adult with the wings exposed, about to fly. Photo by Wikimedia user Drägüs.*

The sun beetle has nine subspecies, each with a particular color pattern. The most well known subspecies is Pachnoda marginata peregrina and is the one shown in the photos above.

Since the sun beetle is easy to keep in the lab, it has been eventually used in scientific studies, especially some related to the neurology of the olphactory receptors.

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References:

Larsson, M. C., Stensmyr, M.. C., Bice, S. B., & Hansson, B. S. (2003). Attractiveness of Fruit and Flower Odorants Detected by Olfactory Receptor Neurons in the Fruit Chafer Pachnoda marginata Journal of Chemical Ecology, 29 (5), 1253-1268 DOI: 10.1023/A:1023893926038

Stensmyr, Marcus C., Larsson, Mattias C., Bice, Shannon, & Hansson, Bill S. (2001). Detection of fruit- and flower-emitted volatiles by olfactory receptor neurons in the polyphagous fruit chafer Pachnoda marginata (Coleoptera: Cetoniinae) Journal of Comparative Physiology A, 187 (7), 509-519

Wikipedia. Pachnoda marginata. Availabe at: < https://en.wikipedia.org/wiki/Pachnoda_marginata >. Access on September 8, 2016.

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Filed under Entomology, Friday Fellow, Zoology

New Species: September 11 to 20

by Piter Kehoma Boll

Here is a list of species described from September 11 to September 20. It certainly does not include all described species. Most information comes from the journals Mycokeys, Phytokeys, Zookeys, Phytotaxa, Zootaxa, International Journal of Systematic and Evolutionary Microbiology, and Systematic and Applied Microbiology, as well as journals restricted to certain taxa.

petrolisthes-paulayi

Petrolisthes paulayi is a new crab described in the past 10 days.

SARs

Plants

Amoebozoans

Fungi

Sponges

Cnidaria

Flatworms

Annelids

Nematodes

Arachnids

Myriapods

Crustaceans

Hexapods

Cartilaginous fishes

Ray-finned fishes

Lissamphibians

Reptiles

Mammals

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Filed under Systematics, taxonomy

New Species: September 1 to 10

by Piter Kehoma Boll

Here is a list of species described from September 1 to September 10. It certainly does not include all described species. Most information comes from the journals Mycokeys, Phytokeys, Zookeys, Phytotaxa, Zootaxa, International Journal of Systematic and Evolutionary Microbiology, and Systematic and Applied Microbiology, as well as journals restricted to certain taxa.

Archaea

Bacteria

SARs

Plants

Fungi

Annelids

Mollusks

Nematodes

Arachnids

Myriapods

Crustaceans

Hexapods

Cartilaginious fishes

Ray-finned fishes

Reptiles

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Filed under Systematics, taxonomy