Bertella idiomorpha

Taxobox
name = "Bertella idiomorpha"


regnum = Animalia
phylum = Chordata
classis = Actinopterygii
ordo = Lophiiformes
familia = Oneirodidae
genus = "Bertella"
species = "B. idiomorpha"
binomial = "Bertella idiomorpha"
binomial_authority = Pietsch, 1973

"Bertella idiomorpha" is a species of deep-sea anglerfish found in the northern Pacific Ocean. It is the only species in the genus "Bertella", in the family Oneirodidae, also known as "dreamers".

Distribution

Specimens of "B. idiomorpha" have only been collected in the northern Pacific Ocean, including off Japan, in the Bering Sea, and in the Gulf of California. The depths ranged from 580 m to 3475 m.FishBase_species| genus = Bertella | species = idiomorpha | month = October | year = 2008]

Description

Like other oneirodids, "B. idiomorpha" is a small, globular-bodied fish with a large head and jaws, and a bioluminescent lure (esca) on a stalk (illicium) attached to the head. The skin is scaleless and covers the base of the caudal fin. There are numerous small, rounded, darkly pigmented papillae on the head, body, and tail, associated with the lateral line system. The fish is dark brown to black in color, except for the clear tips of the papillae and the end of the esca. The jaws are filled with slender, straight teeth. The females measure up to 8.4 cm in length.cite journal| last = Pietsch | first = Theodore W. | title = A New Genus and Species of Deep-sea Anglerfish (Pisces: Oneirodidae) From the Northern Pacific Ocean | journal = Copeia | volume = 1973 | issue = 2 | pages = 193-199 | date = May 22, 1973 | url = http://www.jstor.org/stable/1442957 | accessdate = 2008-10-09] Only one male is known, a 11-mm specimen attached to a 77-mm female.cite journal| last = Pietsch | first = Theodore W. | title = Dimorphism, parasitism, and sex revisited: modes of reproduction amongst deep-sea ceratioid anglerfishes (Teleostei: Lophiiformes) | journal = Ichthyological Research | volume = 52 | issue = 3 | pages = 207-236 | date = August 2005 | url = http://www.springerlink.com/content/hx43643073w66208/ | accessdate = 2008-10-09] "B. idiomorpha" is unique amongst the oneirodids in having a hyomandibular bone (the bone that attaches the lower jaw to the cranium) with a single head. In its family, "B. idiomorpha" most resembles the genus "Dolopichthys", differing in having a wider and deeper skull, shorter and fewer jaw teeth, and in details of the mandibular spines and the esca.

Biology

In contrast to the closely related "Dolopichthys", which feeds on fish and squid, "B. idiomorpha" feeds on amphipods, krill, and small decapods. This difference in prey items is reflected in the body shape of "B. idiomorpha", which is shorter and deeper, suggesting that it is a more sluggish swimmer than "Dolopichthys". "B. idiomorpha" also has smaller and fewer teeth, and its single-headed hyomandibular bone reduces the strength of its bite, again consistent with preying on smaller, slower prey items.

"B. idiomorpha" and "Leptacanthithys gracilispinis" are the only oneirodids known to have parasitic males. Both the tips of the upper and lower jaws of the male "B. idiomorpha" become fused to the female. Small openings to the mouth and opercular cavities of the male are maintained on both sides. Mature female "B. idiomorpha" contain around 7500 eggs per ovary, and have some of the largest eggs amongst the deep-sea anglerfish.

References