Crossorhombus howensis  Hensley & Randall, 1993

Lord Howe Island flounder
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Crossorhombus howensis
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Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (ray-finned fishes) > Pleuronectiformes (Flatfishes) > Bothidae (Lefteye flounders)
Etymology: Crossorhombus: Greek krossoi = tassel + Greek, rhombos = paralelogram (Ref. 45335).   More on author: Randall.

Environment / Climate / Range Ecology

Marine; demersal; depth range ? - 8 m (Ref. 9824).   Temperate

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 13.0 cm TL male/unsexed; (Ref. 9824)

Short description Morphology | Morphometrics

Dorsal soft rays (total): 85-88; Anal soft rays: 64 - 69. Head and body on eyed side tan to grey with many small dark specks and spots. A series of dark spots very close to dorsal and ventral edges of body. About 4 or 5 spots along straight section of lateral line. Dorsal, anal, and caudal fin light coloured with small dark specks. Flaps on eyes of males with dark spots. Blind side of females tan to whitish. Males with distinct bluish black V-shaped mark on blind side. Ventral arm of "V" wider than dorsal arm. Body ovoid, its depth about 1.7 times SL. Head small, snout shorter than eye, profile steep anterior to interorbital area. Head length 3.9 to 4.2 times SL. Interorbital region broad and concave, probably wider in males than females. Males with a rostral spine and several small orbital spines. Both eyes on left side of head, front margin of upper eye over middle of lower eye. Flaps on posterior areas of eyes in males. Mouth small, reaching to below anterior margin of lower eye, length of upper jaw 3.5 to 4.1 times in head length. Teeth of upper jaw biserial, teeth of outer row more widely spaced than teeth of inner row. Teeth in lower jaw uniserial. Gill rakers short. Scales on eyed side with long ctenii. Scales on blind side cycloid. Pectoral fin on eye side with 11 or 12 rays and on blind side with 9 or 10 rays (Ref 42535).

Distribution Countries | FAO areas | Ecosystems | Occurrences | Introductions | Faunafri

Northwest Pacific: Taiwan. Southwest Pacific: Lord Howe Island. Possibly occurring in the Western Central Pacific.

Biology     Glossary (e.g. epibenthic)

Lives on silty sand bottoms and feeds on bottom-living animals. Only known from specimens collected from divers. Sexually dimorphic characters possibly develop at about 6-7 cm SL.

Main reference Upload your references | References | Coordinator : Amaoka, Kunio | Collaborators

Hensley, D.A. and K. Amaoka, 2001. Bothidae. Lefteye flounders. p. 3799-3841. In K.E. Carpenter and V. Niem (eds.) FAO species identification guide for fishery purposes. The living marine resources of the Western Central Pacific. Vol. 6. Bony fishes part 4 (Labridae to Latimeriidae), estuarine crocodiles. FAO, Rome.

IUCN Red List Status (Ref. 90363)

  Not Evaluated 

Threat to humans

  Harmless




Human uses

Fisheries: of no interest
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Estimates of some properties based on empirical models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5312   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01273 (-0.17164 - 0.19710), b=3.03 (2.92 - 3.13), based on LWR estimates for this family-BS (Ref. 93245).
Trophic Level (Ref. 69278):  3.5   ±0.37 se; Based on food items.
Resilience (Ref. 69278):  High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153):  Low vulnerability (25 of 100) .
Price category (Ref. 80766):   .