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1.
A new platycephalid,Thysanophrys papillaris, is described on the basis of six specimens (78–121 mm SL) collected from the Andaman Sea and off northern Australia (Timor
and Arafura Seas). This new species can be distinguished from other congeners by the following combination of characters:
presence of a single short papilla on upper surface of eye, longer snout, smaller body scales. 11 second dorsal-fin rays and
12 anal-fin rays, presence of four or more suborbital spines usually, branched short iris lappet, ctenoid lateral-line scales
and interopercle not extended posteroventrally. 相似文献
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A rare platycephalid,Onigocia grandisquama (Regan), is redescribed in detail from the holotype and an additional specimen collected from the Gulf of Thailand, western Pacific. The species is characterized by the following combination of characters: 11 anal fin rays, 32–34 lateral line scales, anteriormost 3–5 or 3–6 lateral line scales with a distinct spine, 1–2 preocular spines, broad and flat ocular flap, and long head (42.4–44.7% of standard length). 相似文献
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The respiratory mechanisms of a shallow-water, marine and estuarine flathead, Platycephalus fuscus C. & V. are described. Morphological and behavioural adaptations enabling respiration while the fish is buried in fine, unconsolidated sediments are investigated and related to the ecology of the species. 相似文献
6.
A new bembrid,Bembras adenensis, is described on the basis of specimens collected from the Gulf of Aden, western Indian Ocean. This species is easily distinguished
fromB. japonica, the only known congener of the genus, by the following combination of characters: larger orbital diameter, longer head length,
pectoral-fin with a small black blotch near tip of upper rays, 3 gill rakers on upper gill arch, 19 pectoral-fin rays, and
15 anal-fin rays (vs. smaller orbital diameter, shorter head length, pectoral-fin with several small spots forming irregular
bands, 2 gill rakers on upper gill arch, usually 17 pectoral-fin rays, and 14 anal-fin rays inB. japonica). 相似文献
7.
The osteological development of the synanceiidInimicus japonicus, was described on the basis of five larvae and four juveniles (4.2–10.1 mm BL) reared in the laboratory, and two wild adult
specimens. All bones, except for the basisphenoid, were formed in all larvae and juveniles, but fusions between the uppermost
actinost and scapula, upper caudal plate and urostyle, and third preural centrum and hemal spine were not completed by 10.1
mm BL. Following comparison with the adult condition, a rod-like ossified bone without a tooth plate on the upper branchial
arch of larvae and juveniles was considered homologous with the second pharyngobranchial. The number of epurals and length
of the neural spine on the second preural centrum varied (unrelated to growth) and it is inferred thatJ. japonicus shows intraspecific variations in these bones. 相似文献
8.
Morphological and osteological development of the flathead,Percophis brasiliensis, is described based on specimens collected from southeastern Brazilian waters. Identification of larvae was based on pigment
pattern and meristic counts. Distinct melanophores were present on the bottom of the hindbrain, between the bases of the pelvic
fins and on the bases of the pectoral fins. Within the family Percophididae onlyPercophis brasiliensis has 57 myomeres, which result in the larvae having an elongated body form. The larval pigment pattern and structure of the
caudal complex suggest that the subfamilies Percophinae and Bembropinae are phylogenetically close, while the Hemerocoetinae
belong to an advanced group within the family. 相似文献
9.
The juvenile development of four Japanese flatheads (Platycephalidae),Onigocia macrolepis. O. spinosa, Inegocia japonica andRogadius asper, is described and illustrated from specimens trawled in Tosa Bay, southern Japan. Juveniles of twoOnigocia species are diagnosed by an ocular flap and absence (O. macrolepis) or presence (O. spinosa) of distinct dark bars on the body.Inegocia japonica juveniles are distinctive in having a heavily pigmented body and 12 dorsal and anal fin soft rays.Rogadius asper has a unique antrorse preopercular spine prior to 15 mm SL. During the early juvenile stage, strongly negative allometric
growth occurs in the interorbital region, accompanied by migration of the eyes from the lateral to dorsal surface of the head. 相似文献
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Suggrundus meerdervoortii (Platycephalidae) has been hypothesized to pass through four phases, thus changing sex three times: the first male, first female, second male and second female phases. In this study, gonads of males and females were constructed from developed testis with an immature ovary and only oocytes, respectively. The females in this study were significantly larger than the males. There was no female in the size range of the hypothesized first female phase. Reversed sex change among protandrous fishes has not been reported in any other studies. Thus, the specimens of the hypothesized first female phase may be different from S. meerdervoortii. Therefore, this species should be considered protandrous without reversed sex change. 相似文献
12.
Archig Jeamah Chanyut Sudtongkong Anan Kenthao Supapong Imsonpang Kitipong Angsujinda Natthawut Charoenphon Anjaree Inchan Piyamat Kongtueng Tappadit Mitparian Sinlapachai Senarat 《Acta zoologica》2023,104(4):575-585
The Japanese flathead, Inegocia japonica Cuvier, 1829 is a commercially important fish in small-scale coastal fisheries in Thailand; however, an explanation of its digestive biology is missing. This study describes the digestive tract and accessory organs of I. japonica, using morphological and histological methods. The fish (10 individual fish, 24.5 ± 0.98 cm in total length) were obtained from Libong Island, Thailand. Integrated morphological and histological data showed that the digestive tract was composed of oesophagus, stomach, pyloric caeca and intestine, with accessory organs. All digestive tracts consisted of four layers, including mucosa, submucosa, muscularis and serosa. Two stomach regions were identified (cardiac and pyloric stomachs). Several clusters of gastric glands were identified in the cardiac stomach. Each gland was a unicellular structure. The apical surface of this gland contained the vacuolar cell. The intestine was lined with a simple columnar structure with goblet cells that was similar to pyloric caecum. Goblet cells were rare in the anterior intestine, in contrast to the posterior intestine where goblet cells were abundant. The numerous of hepatocyte was mostly observed in the liver, whereas an exocrine acinar cell of pancreas was also identified. The results of our observations provided the first information of the digestive tract of I. japonica and can be applied to advanced study, such as physiology and histopathology. 相似文献
13.
Melody Puckridge Nikos Andreakis Sharon A. Appleyard Robert D. Ward 《Molecular ecology resources》2013,13(1):32-42
Identification of taxonomical units underpins most biological endeavours ranging from accurate biodiversity estimates to the effective management of sustainably harvested, protected or endangered species. Successful species identification is now frequently based on a combination of approaches including morphometrics and DNA markers. Sequencing of the mitochondrial COI gene is an established methodology with an international campaign directed at barcoding all fishes. We employed COI sequencing alongside traditional taxonomic identification methods and uncovered instances of deep intraspecific genetic divergences among flathead species. Sixty‐five operational taxonomic units (OTUs) were observed across the Indo‐West Pacific from just 48 currently recognized species. The most comprehensively sampled taxon, Platycephalus indicus, exhibited the highest levels of genetic diversity with eight lineages separated by up to 16.37% genetic distance. Our results clearly indicate a thorough reappraisal of the current taxonomy of P. indicus (and its three junior synonyms) is warranted in conjunction with detailed taxonomic work on the other additional Platycephalidae OTUs detected by DNA barcoding. 相似文献
14.
Naohiko Takeshita Norio Onikura Seiichi Matsui Seirô Kimura 《Ichthyological Research》1997,44(2-3):257-266
Embryonic, larval and juvenile development of the catadromous roughskin sculpin,Trachidermus fasciatus, were described using eggs spawned in an aquarium. The eggs, measuring 1.98–2.21 mm in diameter, were light reddish-yellow
and had many oil globules, 0.05–0.18 mm in diameter. Hatching occurred 30 days after spawning at 2.3–11.3°C. The newly-hatched
larvae, measuring 6.9–7.3 mm BL, had a single oil globule, 9–10+25–26=34–36 myomeres and 6 or 7 large stellate melanophores
dorsally along the gut. The yolk was almost resorbed, number of pectoral-fin rays attained 16–17, and two parietal, one nuchal
and four preopercular spines were formed, 5 days after hatching, at 8.2–8.4 mm BL. The oil globule disappeared, and one supracleithral
spine was formed, 11 days after hatching, at 8.9–9.5 mm BL. Notochord flexion began 15 days after hatching, at 9.7–10.3 mm
BL. A posttemporal spine was formed 20 days after hatching, at 10.7–10.9 mm BL. The first dorsal fin spines (VII–VIII), second
dorsal fin and anal fin rays (18–19, 16–18, respectively) appeared 23 days after hatching, at 12.0–13.7 mm BL. The pelvic
fin spine and rays (I, 4) were formed and black bands on the head and sides of the body began to develop 27 days after hatching,
at 13.8–15.8 mm BL.
Newly-hatched larvae swam just below the surface in the aquaria. Preflexion larvae (8.9–9.5 mm BL), in which the oil globule
had disappeared, swam in the middle layer, while juveniles (13.8–15.8 mm BL) began swimming on the bottom of the aquaria.
Swimming behavior observed in the aquaria suggested that the fish started to change to a demersal existence at the juvenile
stage. 相似文献
15.
Hisashi Imamura 《Ichthyological Research》2007,54(3):303-307
A new platycephalid, Rogadius mcgroutheri, is described on the basis of the specimens collected from eastern Australia and New Caledonia. Rogadius mcgroutheri is distinguished from other congeners by 11 second dorsal fin rays usually, 4 or 6–8 unbranched lower pectoral fin rays,
larger orbital diameter, usually single preocular spine lacking the accessory spines on the anterior base, short antrorse
preopercular spine, tooth band on palatine narrow, with 2 irregular tooth rows, body with indistinct or somewhat distinct
brown blotches, and caudal fin with dark brown spots and bands. 相似文献
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Mating system and protandrous sex change of the lizard flathead Inegocia japonica were investigated off Nagashima, Kagoshima, Japan. The reproductive season of this species was estimated to be from June to September by a fluctuation of gonadsomatic index from monthly sampling data. The hermaphrodite fish, having testicular and ovarian parts, were collected from February to December, indicating that the sex change occurred in both reproductive and nonreproductive seasons. Females were larger than males and hermaphrodites. Moreover, five cases of the sex change from male to female were directly confirmed during the 1995–1997 field census in the behavioral observation area. Home ranges, where no aggressive interaction took place among any individuals, overlapped within and between sexes. Seven pair spawnings observed in the area were not of the same individual combination, and the size of pair fish was likely to be random. This species may thus have a promiscuous mating system, i.e., random pairing, which favors protandry as predicted in the size-advantage model. 相似文献
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Takamitsu Kawaguchi Hiroshi Kohno Kiyoshi Fujita Yasuhiko Taki 《Ichthyological Research》1999,46(2):163-170
Larval and juvenile development of two blenniids,Omobranchus fasciolatocepts andO. punctatus, is described using eggs collected from natural waters in Tokyo Bay and incubated in an aquarium. These larvae and juveniles
are compared with those of two otherOmobranchus species,O. elegans andO. loxozonus, distributed widely in Japan.Onobranchus punctatus is characterized by a unique, pointed snout in preflexion larvae, no melanophores proximally on the lower part of the pectoral
fins in flexion and postflexion larvae, and pterygiophores projecting externally as blades between the dorsal and anal fin-rays
in postflexion larvae and juveniles.Omobranchus fasciolatoceps has the following characteristics: a few melanophores on the fore-and mid-brain, but none on the hind-brain in preflexion
larvae; no melanophores on the cleithral symphysis in flexion and postflexion larvae; no external pterygiophore blades in
postflexion larvae and juveniles; and a unique dorsal skin flap on the head in juveniles. Ontogenetic developement of dorsal
and anal pterygiophores is described forO. fasciolatoceps andO. punctatus. InO. punctatus, the postero-distal part of each proximal radial projects remarkably to form the external blades between the soft fin-rays,
whereas the external blades between the fin spines are formed by fusion of a dermal bone developed from the antero-distal
part of each proximal radial with the adjacent distal radial. 相似文献
20.
All the postembryonic developmental instars of Phyllodiaptomus blanci (Guerne & Richard, 1896), reared in the laboratory, are described and illustrated. The larval affinities of this species
vis-a-vis certain other diaptomid species are mentioned. 相似文献