Cat-eLog Right Arrow Loricariidae Right Arrow Hypostominae Right Arrow Lasiancistrus

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Scientific NameLasiancistrus planiceps  (Meek & Hildebrand, 1913)
Common Name
Type LocalityRio Tuyra, Boca de Cupe, Panama.
PronunciationLASS ee an SISS truss
EtymologyGreek, lasios, -a, -on = hairy + Greek, agkistron = hook 
Jump to next section Species Information
Size 198mm or 7.8" SL. Find near, nearer or same sized spp.
IdentificationAdult Lasiancistrus can be separated from all other loricariids by the presence of whisker-like odontodes on the cheeks. In addition, they have evertible cheek odontodes; three rows of plates on the caudal peduncle; and a modified, bar-shaped opercle. The caudal fin is slightly emarginate to forked, with the lower lobe longer than upper. Nuptial males have tentacules on the pectoral-fin spines longer than their associated odontodes; and transluscent tentacules on the snout that have odontodes associated with them. Nuptial males lack hypertrophied odontodes on top of the head and lack long, bristle-like odontodes on the leading edge of the pectoral-fin spine.

Head 2.7 to 2.8; depth 6.2 to 6.6; D. I, 8; A. I, 3; lateral scutes 24 to 26. Body depressed anteriorly, rounded to compressed posteriorly; width of head 1.2 to 1.3 in its length; depth of head 2.4; eye 7.4 to 8.5; interorbital 2.3 to 2.4; mandibular ramus 6.5 to 8.0; snout 1.6 to 1.8 in head; head without ridges, the median portion of the snout elevated; sides of snout margined with bristles; interoperculum movable, armed with about 28 spines, capable of being everted and nearly concealed under edge of operculum, the longest spine 3.5 to 4.2 in head; scutes spinulose, not carinated; 6 scutes between dorsal and adipose fins, 11 between anal and caudal; supraoccipital scute bordered by median scute and 2 lateral ones ; lower surface of head and abdomen naked ; first dorsal ray 1.1 to 1.4 in head; base of dorsal 1.7 to 1.8, equaling its distance from adipose fin; pectoral spine extending to distal fourth of ventral, its length .9 to 1.0 in head; caudal obliquely truncate; depth of caudal peduncle 3.6 to 4.0 in head, its depth in its length 3.1. Color: dark, uniform, fins all spotted with blue to bluish white; abdomen and under side of head with or without light spots.
SexingSnout of nuptial males almost square (vs. rounded in females and juveniles). Adult males of most species (except Lasiancistrus tentaculatus) with whisker-like odontodes at anterolateral corner of snout; males of L. tentaculatus have tentacules instead of whisker-like odontodes along anterior margin of snout. Nuptial males have tentacules longer than their associated odontodes on the pectoral-fin spine.
General RemarksThis species is considered by some to be a synonym of Lasiancistrus caucanus. However the distribution of this species is inconsistent with the distribution of L. caucanus. Until more specimens can be examined across the range and this issue resolved, L. planiceps is being listed as a unique species.
Jump to next section Habitat Information
DistributionRio Tuyra, Boca de Cupe, Panama.
Panama Pacific Rivers, Tuira (click on these areas to find other species found there)
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Jump to next section Further Information
ReferencesMeek & Hildebrand. 1913. Field Museum of Natural History, Publications, Zoölogical Series v. 10 (no. 8): 77-91.
Registered KeepersNone.
Breeding ReportsNone.
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Last Update2017 Jan 07 02:24 (species record created: 2011 Dec 16 19:19)