ENTOMACRODUS CAUDOFASCIATUS - (REGAN, 1909)
Actinopterygii (Gigaclass) > Actinopteri (Class) > Teleostei (Subclass) > Blenniiformes (Order) > Blenniidae (Family) > Salariinae (Subfamily) > Entomacrodus (Genus)
Barred-tail rockskipper, Bartail blenny, Tail-barred rockskipper, Aomonginpo, アオモンギンポ, 尾带犁齿鳚, 尾带间颈须鳚,
Synonymes
Salarias caudofasciatus (Regan, 1909)
Salarias rarotongensis (Whitley, 1965)
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Description
Dorsal spines (total): 13; Dorsal soft rays (total): 14-16; Anal spines: 2; Anal soft rays: 15-17. Posteriormost anal pterygiophore supporting 1 or 2 external elements (supporting 2 in 67-100 percent of specimens depending on population); Total gill-rakers on first arch: 13-18; Pseudobranchial filaments: 5-8 (usually 6-7, number not increasing with increase in Standard Long); Vertebrae: 33-35 (34 in 93 percent of specimens); Supraorbital cirri: 1-8, increasing in number with increase in Standard Long; Main or longest supraorbital cirrus with all branches mesially (2 specimens only had 1 branch laterally); Nape with 1 cirrus on each side (2 on one side in 1 specimen); Predorsal commissural pores: 4-25 (number increasing with increase in Standard Long); Preopercular series of pores with all positions with simple pores (4 specimens, of 145 examined, each with 1 pair of pores included in series); Lateral line pores terminating on side in area below and between dorsal fin spine 8 and dorsal soft ray 5; Ventral margin of upper lip mainly crenulate on lateral thirds, entire to very weakly crenulate on middle third; main (lateral) crenulae usually numbering: 7-11 on each side. Males develop fleshy rugose modifications of the skin of the anal spines and anterior first to third anal rays. If one considers males with these modifications to be mature. Max. length: 6.2 cm SL. Depth range: 0 - 3 m.
Color
There are several different types of color pattern found in this species. By and large, these types are associated with geographic destribution, with no two types occurring in the same area. All specimens except those from Rarotonga, Tahiti, Makatea, and Raroia, are characterized by having a dark humeral blotch on the body. The nature of this blotch is more or less characteristic within a given geographic area. Aside from the differences in color pattern discussed above, there appears to be some slight meristic (number of dorsal and anal rays) and proportional (dorsal spine three, dorsal ray one, and horizontal humeral blotch lengths) differences which are associated with some of the various color pattern types.
Etymology
Entomacrodus: from Greek, ento = inside, in + from Greek, makros = big + from Greek, odous = teeth. Referring to very large and recurved tooth on each side of interior lower jaw of Entomacrodus nigricans and/or to its “greatly developed” canine teeth.
caudofasciatus: from Latin, cauda = tail + from Latin, fascia, fascio = bundled, banded + from Latin suffix, -inus = pertaining to. Referring to the caudal-fin color pattern of the species.
Original description: Salarias caudofasciatus Regan, 1909 - Type locality: Christmas Island, Indian Ocean.
Distribution
Eastern Indian Ocean, western Pacific: Andaman Islands, Christmas and Cocos-Keeling islands, east to Tuamotu and Pitcairn islands, north to Philippines, south to New Caledonia and Kermadec Islands.
Biology
Adults are found along rocky intertidal shorelines, benches, outer reef flats, and reef margins subject to some degree of wave action. Feeds on filamentous algae. Oviparous, distinct pairing. Eggs are demersal and adhesive, and are attached to the substrate via a filamentous, adhesive pad or pedestal. Larvae are planktonic, often found in shallow, coastal waters.
Barred-tail rockskipper, Bartail blenny, Tail-barred rockskipper, Aomonginpo, アオモンギンポ, 尾带犁齿鳚, 尾带间颈须鳚,
Synonymes
Salarias caudofasciatus (Regan, 1909)
Salarias rarotongensis (Whitley, 1965)
------------------------------
Description
Dorsal spines (total): 13; Dorsal soft rays (total): 14-16; Anal spines: 2; Anal soft rays: 15-17. Posteriormost anal pterygiophore supporting 1 or 2 external elements (supporting 2 in 67-100 percent of specimens depending on population); Total gill-rakers on first arch: 13-18; Pseudobranchial filaments: 5-8 (usually 6-7, number not increasing with increase in Standard Long); Vertebrae: 33-35 (34 in 93 percent of specimens); Supraorbital cirri: 1-8, increasing in number with increase in Standard Long; Main or longest supraorbital cirrus with all branches mesially (2 specimens only had 1 branch laterally); Nape with 1 cirrus on each side (2 on one side in 1 specimen); Predorsal commissural pores: 4-25 (number increasing with increase in Standard Long); Preopercular series of pores with all positions with simple pores (4 specimens, of 145 examined, each with 1 pair of pores included in series); Lateral line pores terminating on side in area below and between dorsal fin spine 8 and dorsal soft ray 5; Ventral margin of upper lip mainly crenulate on lateral thirds, entire to very weakly crenulate on middle third; main (lateral) crenulae usually numbering: 7-11 on each side. Males develop fleshy rugose modifications of the skin of the anal spines and anterior first to third anal rays. If one considers males with these modifications to be mature. Max. length: 6.2 cm SL. Depth range: 0 - 3 m.
Color
There are several different types of color pattern found in this species. By and large, these types are associated with geographic destribution, with no two types occurring in the same area. All specimens except those from Rarotonga, Tahiti, Makatea, and Raroia, are characterized by having a dark humeral blotch on the body. The nature of this blotch is more or less characteristic within a given geographic area. Aside from the differences in color pattern discussed above, there appears to be some slight meristic (number of dorsal and anal rays) and proportional (dorsal spine three, dorsal ray one, and horizontal humeral blotch lengths) differences which are associated with some of the various color pattern types.
Etymology
Entomacrodus: from Greek, ento = inside, in + from Greek, makros = big + from Greek, odous = teeth. Referring to very large and recurved tooth on each side of interior lower jaw of Entomacrodus nigricans and/or to its “greatly developed” canine teeth.
caudofasciatus: from Latin, cauda = tail + from Latin, fascia, fascio = bundled, banded + from Latin suffix, -inus = pertaining to. Referring to the caudal-fin color pattern of the species.
Original description: Salarias caudofasciatus Regan, 1909 - Type locality: Christmas Island, Indian Ocean.
Distribution
Eastern Indian Ocean, western Pacific: Andaman Islands, Christmas and Cocos-Keeling islands, east to Tuamotu and Pitcairn islands, north to Philippines, south to New Caledonia and Kermadec Islands.
Biology
Adults are found along rocky intertidal shorelines, benches, outer reef flats, and reef margins subject to some degree of wave action. Feeds on filamentous algae. Oviparous, distinct pairing. Eggs are demersal and adhesive, and are attached to the substrate via a filamentous, adhesive pad or pedestal. Larvae are planktonic, often found in shallow, coastal waters.
Similar species
Blenniella chrysospilos (Bleeker 1857) - Reported from New Caledonia. Link to the species (here).
Blenniella chrysospilos (Bleeker 1857) - Reported from New Caledonia. Link to the species (here).
Blenniella paula (Bryan & Herre, 1903) - Reported from New Caledonia.
Blenniella periophthalmus (Valenciennes, 1836) - Reported from New Caledonia.
Entomacrodus striatus (Valenciennes, 1836) - Reported from New Caledonia. Link to the species (here).
Blenniella periophthalmus (Valenciennes, 1836) - Reported from New Caledonia.
Entomacrodus striatus (Valenciennes, 1836) - Reported from New Caledonia. Link to the species (here).