Linophryne pennibarbata Bertelsen 1980

View data on Catalog of Fishes here.

Body proportions, spines of sphenotics, preopercle, and lower jaw, pattern of jaw teeth, coloration and other characters as for most or all species of the genus. Frontal spines absent, a single pair of vomerine teeth, longest teeth in lower jaw 6.5–10% SL; dorsal-fin rays 3; anal-fin rays 3; pectoral-fin rays 15–18. Holotype and three paratypes (40–43.5 mm) with escae and barbels fully developed, very similar in morphology and relative size: illicial length 20–25.5% SL; enlarged pair of proximal side-branches of distal escal appendage pointed and slightly fusiform, length about one and one-half times diameter, with a few filaments on tip; below enlarged side-branches, a pair of shorter filamentous side-branches, and above, three pairs of similar but slender side-branches, each branched at tip.

Barbel with anterior cluster of four primary branches, each about 20% SL in length and bearing a distal tassel of numerous filaments containing photophores; an unpaired posterior primary branch, length about 45–50% SL (measured to base of distal filaments), distal one-half to two-thirds gradually tapering and becoming laterally compressed, bearing numerous side-branches, each decreasing in length distally: from proximal to distal, a series of 6 or 7 anteroventral side-branches, each bearing a distal tassel of branched filaments containing tiny photophores, followed by a secondary series of about 15–18 side-branches along posterior margin (two most proximal side-branches paired), all containing internal photophores and divided distally into filaments, but not forming terminal tassels; a slightly greater number of side-branches along anterior margin, each with a large internal photophore at base and a distal tassel of branched filaments containing tiny photophores.

Two paratypes (41 and 43 mm) appearing more juvenile, with distal escal appendage less than 10% SL and only a single proximal pair of blunt side-branches; similarly their barbels are shorter, branches of anterior cluster less than 5% SL, posterior primary branch about 12% SL. Three metamorphic specimens (35.2–36.5 mm) with distal escal appendage papilliform, and barbels tiny, with a pair of digitiform, undivided rudiments of anterior primary branches and few papilliform side-branches without filaments on posterior primary branch.

Females distinct from those of other species of the genus in the following escal and barbel characters: Distal escal appendage of adults (3 specimens, 40–47 mm) 45–60% SL, with 5 pairs of side-branches, the largest, proximal pair pointed and longer than diameter of bulb; posterior escal appendage short, conical; no other escal appendages present. Barbel divided near base into three primary branches: an anterior pair of bifurcated primary branches without side-branches and a single, posterior primary branch, laterally compressed with series of side-branches along both edges; all branches divided distally into numerous filaments with internal series of photophores; length of barbel (posterior primary branch) to base of distal filaments 35–50% SL in metamorphosed specimens. Subdermal pigment in two rows along side of body.

The holotype and three of the paratypes were caught in the Western Atlantic off Florida in shrimp-trawl in the relatively shallow depths of 325–425 m.

Two paratypes and a metamorphic specimen came from the Eastern North Atlantic, caught in closing nets in 910–1500 m. The remaining three specimens were obtained in the Central North Pacific in open net with maximum fishing depth of 750–1150 m.

Pietsch TW. 2009. Oceanic Anglerfishes: Extraordinary Diversity in the Deep Sea. Berkley: University of California Press. 638 p.

Parasitized females have a single attached male, in contrast to the linophrynid genera Haplophryne and Borophryne (and the ceratiid genera Ceratias and Cryptopsaras) in which females with two or more males are known. In all known cases parasitized females of the family, the male is directed forward with respect to the female and attached in nearly the same position on the ventral midline of the female, somewhat in front of and below the sinistral anus; with only one or two exceptions, all are attached upside down with respect to the female. This is again in contrast to the linophrynid genera Haplophryne and Photocorynus (and the ceratiid genus Cryptopsaras) in which males may attach in any direction and almost anywhere on the head and body of the female. In all known examples, the males are attached by both upper and lower jaws, leaving prominent openings on each side that lead into their mouths and opercular cavities; there is no papilla of tissue projecting from the female into the mouth of the male.

Know from from eleven females, eight metamorphosed (36.5–47 mm) and three in metamorphosis (35–36.5 mm).

SILVER BAY cruise 36, station 3735, 29°58'N, 80°10'W, shrimp-trawl, 0–325 m, 5 February 1962.

Holotype of Linophryne pennibarbata: USNM 219854, 47 mm.

Females distinguished by the following characteristics: distal escal appendage of adults 45-60% SL, with five pairs of side branches, largest, proximal pair pointed and longer than diameter bulb; short posterior escal appendage, conical; barbel divided near base into 3 primary branches; subdermal pigment in two rows along side of body (Ref. 86949).

Dorsal soft rays (total): 3; Analsoft rays: 3

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Linophryne pennibarbata Linophryne generoko animalia da. Arrainen barruko Linophrynidae familian sailkatzen da.

羽髯樹鬚魚為輻鰭魚綱鮟鱇目棘茄魚亞目鬚角鮟鱇科的其中一種，發現於大西洋及中西太平洋的夏威夷群島海域，屬深海魚類，棲息深度910-1550公尺，雌魚體長可達4.7公分，屬肉食性，雄魚寄生在雌魚身上。