Caudotestis ventichthysi is a species of

trematode Trematoda is a Class (biology), class of flatworms known as flukes. They are obligate parasite, obligate internal Parasitism, parasites with a complex biological life cycle, life cycle requiring at least two Host_(biology), hosts. The intermedia ...

s inhabiting hydrothermal vent fishes (particularly ''

Ventichthys biospeedoi The East Pacific ventbrotula (''Ventichthys biospeedoi'') is a species of cusk-eel found around thermal vents on the southern East Pacific Rise at depths of about . This species grows to a length of SL. It is the only known member of its ge ...

'') in the south eastern

Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the contine ...

. It can be distinguished from its family by its symmetrical

testicular A testicle or testis (plural testes) is the male reproductive gland or gonad in all bilaterians, including humans. It is homologous to the female ovary. The functions of the testes are to produce both sperm and androgens, primarily testostero ...

configuration; its

uterus The uterus (from Latin ''uterus'', plural ''uteri'') or womb () is the organ in the reproductive system of most female mammals, including humans that accommodates the embryonic and fetal development of one or more embryos until birth. The ...

passing between the testes. Furthermore, what differentiates it from its cogenerates is caecal length;

cirrus sac Cirrus may refer to: Science * Cirrus (biology), any of various thin, thread-like structures on the body of an animal *Cirrus (botany), a tendril *Infrared cirrus, in astronomy, filamentary structures seen in infrared light * Cirrus cloud, a ty ...

length; its internal

seminal vesicle The seminal vesicles (also called vesicular glands, or seminal glands) are a pair of two convoluted tubular glands that lie behind the urinary bladder of some male mammals. They secrete fluid that partly composes the semen. The vesicles are 5� ...

's shape;

vitelline Vitelline may refer to: Embryology * Vitelline arteries, arteries that bring blood to the yolk sac * Vitelline circulation, the system of blood flowing between an embryo and its yolk sac * Vitelline cyst, a developmental defect relating to the cl ...

extent and arrangement, as well as forebody length and egg-size.

References

External links

WORMS
Plagiorchiida Trematodes parasiting fish Animals described in 2014 {{trematode-stub