"Never loose the opportunity of seeing anything beautiful,

for beauty is God's handwriting."

    Ralph Waldo Emerson (1803-1882)

    Poet and essayist

 

Yellow-banded millipede, Anadenobolus monilicornis. Creque Dam, north-western Saint Croix, United States Virgin Islands.

 


 

    The miriapods are an assemblage that comprise several closely related classes of arthropods with bodily frames divided into many, very similar, segments. The two best-known classes of this group are the diplopods (millipedes), with two pairs of legs per somatic segment, and the chilopods (centipedes), with one pair of legs per segment. As an additional distinction between them, all centipedes are fast and fierce predators of other arthropods, while millipedes are herbivores or saprophages, with but a few species secondarily adapted to occasionally feed on slow-moving prey.

 

Undulating Patterns

 

CLASS DIPLOPODA: MILLIPEDES

 

    Together with scorpions, millipedes were perhaps the first arthropods to leave water and invade land, back in the Silurian period. They were part of terrestrial ecosystems even before insects had appeared on Earth. Generally, diplopods are herbivores or mycophages (they feed on fungi). Many can secrete toxic substances of repulsive flavor that keep predators at bay, and possess aposematic, "don't mess with me" color patterns in combinations of blacks, reds, and yellows that advertise their unpalatability (though some Antillean galliwasps - a group of anguid lizards - feed mainly on them).

 

    Aside from toxins, and given the fact that for all their legs millipedes are very slow, many species exhibit a defense mechanism consisting in curling into a tight spiral. This protects the more vulnerable belly and also brings attackers into closer contact with the toxin-ejecting pores on their sides.

 

    In spite of their name ("thousand feet") no species actually has that many legs. Indeed, some species (the "pill" millipedes), are very short, possessing rather few body segments and pairs of legs.

 


The diverse subspecies of the Puerto Rican tree millipede Anadenobolus arboreus can be strikingly different in color. Compare these individuals to the ones below.
This is the nominate subspecies, A. a. arboreus.

First photograph: Guana Island, British Virgin Islands.

Second photograph: Mount Sage, west-central Tortola, British Virgin Islands.

 

Anadenobolus arboreus josueotonieli. Cartagena Lagoon National Wildlife Refuge, south-western Puerto Rico.

 

Yet another subspecies: Anadenobolus arboreus leucosomus. Cambalache State Forest, northern Puerto Rico.



Intergrade between A. a. arboreus and A. a. leucosomus. Toa Alta, north-eastern Puerto Rico.

 

Yellow-banded millipede, Anadenobolus monilicornis. San Juan, north-eastern Puerto Rico.

 


Puerto Rican giant millipede, Rhinocricus parcus. Toa Alta, north-eastern Puerto Rico.
It is almost as thick as a human thumb, and it and similar species defend themselves with noxious secretions from pores found on each segment.

The genus is a Greater Antillean endemic taxon and, interestingly, it is found only in Cuba (three or four species) and Puerto Rico (this one), skipping Hispaniola, between the other two islands.


Giant millipede, Rhinocricus sp. El Yunque de Baracoa, eastern Cuba.

This individual shows the defensive behavior of curling tightly upon being touched.

(Photograph courtesy of Dr. David Ortiz Martinez).

 

Rhinocricid millipedes, species undetermined. Santo Domingo, southern Dominican Republic, Hispaniola.

 

Rhinocricid millipedes, possibly Anadenobolus excisus. Windsor, north-central Jamaica.

 

Rhinocricid millipede, species undetermined. Grand Etang National Park, northern Grenada, Lesser Antilles.

 

Polydesmid millipede, species undetermined. Guilarte State Forest, west-central Puerto Rico.

 

Polydesmid millipede, species undetermined. Del Este National Park, eastern Dominican Republic, Hispaniola.

(Photograph courtesy of Mr. Piero Fariselli).

 

Pill millipedes, species undetermined. Negril, Jamaica.