Diceratias trilobus Balushkin & Fedorov 1986

View data on Catalog of Fishes here.

Esca laterally compressed, with large, rounded anterior and posterior appendages; distal margin of anterior and posterior escal appendages smooth, usually with one to six, tiny, slender filaments; posterior escal appendage slightly longer than anterior appendage, length, including slender terminal filament, more than one-half width of escal bulb; tiny, close-set, dermal spinules of skin extending out onto esca, covering entire dorsal and lateral surfaces, including distal filaments, in largest known specimens; proximal half of escal bulb, and distal half of slender terminal filaments of some specimens, darkly pigmented, remaining parts of esca unpigmented; escal pore at postero-basal margin of a rounded terminal papilla. Measurements in percent of standard length: head length 40.0–50.1; head width 27.0–37.2; head depth 50.1–55.7; premaxilla length 41.2–47.5; lower jaw length 54.4–60.7; illicium length 27.1–33.7; greatest width of esca 9.6–10.5, least width of esca 2.7–4.3, length of esca 5.8–7.9; longest tooth in upper jaw 6.1–7.3. Number of teeth in upper jaw 67–111, in lower jaw 51–68; vomerine teeth 6–10; dorsal-fin rays 5 or 6, anal-fin rays 4 or 5, pectoral-fin rays 14 or 15.

Metamorphosed females of Diceratias trilobus differ from those of all other species of the genus in having an unusually large, laterally compressed esca, greatest width slightly more than 1.5 times its length (9.6–10.5% SL); a rounded terminal escal papilla; and anterior and posterior escal appendages well developed, each usually bearing one or more, tiny, slender terminal filaments.

The known material of D. trilobus ranges from the type locality off Honshu, Japan, south into temperate waters of Australia and the Eastern Indian Ocean.

Deep, benthopelagic. All of the known specimens were trawled off the bottom at depths of 503–1216 m.

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

The body plan and basic morphology of the family Diceratiidae varies little between genera and species. The following descripiton of all species of the family was taken from Pietsch (2009).

The body of metamorphosed females is short, globular, its depth approximately 50% SL. The mouth is large, the cleft extending past the eye, the opening oblique. The oral valve is well developed, lining the inside of both the upper and lower jaws. There are two nostrils on each side of the snout at the end of a single short tube. The jaw teeth are slender, recurved, and depressible, arranged in overlapping sets. There are 14–65 teeth in the lower jaw and 12–99 in the upper jaw. There are 4–15 teeth on the vomer. The first epibranchial is free from the wall of the pharynx. All four epibranchials are closely bound together by connective tissue. The fourth epibranchial and ceratobranchial are bound to the wall of the pharynx, leaving no opening behind the fourth arch. The proximal two-thirds of the first ceratobranchial are bound to the wall of the pharynx, but the distal one-third is free. The distal end of the first ceratobranchial is free, not bound by connective tissue to the adjacent second ceratobranchial. The proximal one-quarter to one-half of ceratobranchials II–IV are free, not bound together by connective tissue. Gill filaments are absent on the epibranchials, but present on the proximal tip of the first ceratobranchial, the full length of the second and third ceratobranchials, and the distal three-quarters of the fourth ceratobranchial. A pseudobranch is absent. The length of the illicium of females is highly variable, 26–47% SL in Diceratias, 83–225% SL in Bufoceratias. The anterior end of the pterygiophore of the illicium is exposed, emerging on the snout (Diceratias), or concealed beneath the skin of the head, the illicium emerging on the back at the rear of the skull (Bufoceratias). The posterior end of the pterygiophore of the illicium is concealed beneath the skin of the head. There is a second cephalic spine (second dorsal-fin spine), with a distal light organ, emerging from the dorsal surface of the head just behind the base of the illicium. The second cephalic spine tends to sink beneath the skin of the head with age, but remains connected to the surface through a small pore. The lumen of the escal bulb is connected to outside by a pore located on the posterior margin of the base of the terminal escal papilla. The internal pigment of the escal lumen is visible in lateral view, while the basal half of the escal bulb is usually covered with dark pigment. There are numerous, small, rounded, darkly pigmented papillae on the head and body associated with the acoustico-lateralis system, each with an unpigmented distal tip; the pattern of placement is as described for other ceratioids.

The single known metamorphosed male (a juvenile specimen from the Halmahera Sea, 14 mm, LACM 36091-4; see Bertelsen, 1983:312, fig. 1) has relatively large eyes, about 1.2 mm (8.6% SL) in diameter, with a narrow aphakic space surrounding the lens. The olfactory organs are well separated from the eye, the vertical diameter of the posterior nostrils about 0.5 mm, slightly larger than the anterior nostrils. The number of olfactory lamellae is less than 10 (no exact count possible). The frontals are broad, meeting on the midline. Crescent shaped parietals are present, but they are relatively small, their anterior tips just touching the posterior margin of the frontals. The opercle is bifurcate, the dorsal fork nearly as long (95%) as the ventral fork. The dorsal part of the subopercle is slender and tapering to a fine point; the ventral part is elongate and rounded, with a well-developed spine on the anterior margin. There are 6 dorsal-fin-rays, 4 anal-, and 15 pectoral-fin rays. The caudal fin contains 9 rays, the ninth well developed and nearly one-half the length of the longest medial rays. All the caudal-fin rays are simple (Table 0). The testes are oval in shape, about 2.0 mm in length and 0.9 mm in greatest width.

The premaxillae and dentaries of the male have irregularly resorbed edges. There are few larval teeth, only 2–4 on each premaxilla and 1 or 2 on each dentary. There is a pair of recurved denticular teeth on the snout lying slightly posterior to the symphysis of the upper jaw, each about 0.25 mm in length. There are 9 similar denticular teeth lying slightly behind the tip of the lower jaw, 8 of which are arranged in a regular symmetrical pattern consisting of an anterior and posterior transverse series of 4 teeth in each series. The ninth lower denticular tooth is the smallest, placed asymmetrically to the right of the lower series. The slender distal part of each of the four largest denticular teeth are about 0.25–0.30 mm in length (lying medial to the anterior series and lateral to the posterior series), emerging in an obtuse angle from a stout, nearly cylindrical base. All the denticular teeth are mutually free, without expanded connecting bases.

The pterygiophore of the illicium of the male is subdermal, its length 2.5 mm or 18% SL. The anterior end of the pterygiophore lies near the tip of the snout, the posterior end is connected to the anterior edge of the frontals by relatively strong extrinsic muscles. An irregularly shaped rudiment of the second cephalic spine lies slightly posterior to the middle of the pterygiophore, connected to the anterior edge of the parietals by retractor muscles (posterior inclinatores dorsalis).

The skin of the male is everywhere covered with tiny conical dermal spinules, those on the tip of the snout and chin slightly larger, more sharply pointed, and more closely spaced. The rounded basal plates of the largest spinules are about 0.15–0.2 mm in diameter.

The larvae (two known specimens, both females, 7–10.5 mm; ZMUC P922538, P92676) are extremely similar despite the large difference in size. The eye diameter is about 1.1–1.2 mm, relatively larger in the smaller specimen. The skin is inflated, forming an almost perfect sphere. The head is very large, its length more than 50% SL, but the mouth is relatively small. Both specimens are females, with relatively large rudiments of two cephalic spines: the illicium arising just in front of the eyes, its length almost equal to the diameter of the eye; and the second cephalic spine, arising just behind the first, about one-half as large. The overall color of the head and body is light gray-brown. There are tiny melanophores of almost uniform density over the entire body. Only the illicium and distal part of the fins are unpigmented. The second cephalic spine is pigmented with same density as the rest of the skin. Inner pigmentation of the body is visible through the skin, consisting of very small branched melanophores, arranged without distinct groups. The dorsal surface is slightly darker than the belly. The melanophores are grouped slightly more densely along the margins between the myomeres. There are 5–6 dorsal-fin rays, 4 anal-fin rays, 14–15 pectoral-fin rays, and 9 caudal-fin rays.

The color of metamorphosed specimens is dark brown to black over the entire surface of the head, body, and oral cavity, except for the distal portion of the escal bulb. The dorsal, anal, and caudal fins are unpigmented in females less than about 50 mm. The skin of the male is brownish black, except for that associated with the olfactory organs and tip of the snout. The subdermal pigmentation is light, without distinct concentrations of melanophores.

The largest known specimen of the family is a 275-mm female of Diceratias pileatus (BPBM 30655) found floating on the surface off Kona, Hawaii. The only known metamorphosed male measures 14 mm.

No sexually parasitized female of the family has ever been found. The largest known female of the family, a solitary and apparently mature female Diceratias pileatus, with large ovaries containing numerous eggs 0.3–0.7 mm in diameter, is good evidence that sexual parasitism does not occur in this family. The assumption that diceratiid males do not become parasitically attached to females seems supported further by the general morphology and spinulose skin of the single male described here, being remarkably similar to the males of the Himantolophidae and Melanocetidae, which undoubtedly are non-parasitic.

To 235 mm SL.

SHANTAR trawl 28, 38º20.7'N, 142º31.9'E, 1211–1216 m, 28 March 1975.

Holotype of Diceratias trilobus: ZIN 47426, 122 mm.

Dorsal soft rays (total): 5 - 6; Analsoft rays: 4 - 5

Distinguishing characteristics of metamorphosed female: esca unusually large and laterally compressed esca, greatest width more than 1.5 times its length; terminal escal papilla, rounded; well developed posterior and anterior escal appendages, usually bearing 1 or more tiny, slender terminal filaments; upper jaw with 67-111teeth, lower jaw 51-68 teeth; vomerine teeth 6-10 (Ref. 86949).

Specimens trawled off from bottom at depth up to 1216 m (Ref. 86949).

Diceratias trilobus is a species of double angler, a type of anglerfish. The fish is bathypelagic and has been found as deep as 1,216 metres (3,990 ft). It is endemic to the northwest Pacific Ocean.

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Diceratias trilobus Diceratias generoko animalia da. Arrainen barruko Diceratiidae familian sailkatzen da.

三葉雙角鮟鱇，為輻鰭魚綱鮟鱇目棘茄魚亞目雙角鮟鱇科的其中一種，為深海魚類，分布於西北太平洋的日本海域，棲息深度1211-1216公尺，體長可達14公分，生活習性不明，不具任何經濟價值。