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Asymmetron inferum Nishikawa, 2004
Classification / Names आम नाम | उपशब्द | CoL | ITIS | WoRMS
Leptocardii | Not assigned | Branchiostomidae
Environment: milieu / climate zone / गहराई सीमा / distribution range पारिस्थितिकी
; गहराई सीमा 229 - ? m (संदर्भ 766). Deep-water
Distribution देश | ऐफ ऐ ओ क्षेत्र | Ecosystems | संयोग | भूमिका
Northwest Pacific: Japan.
Length at first maturity / आकार / Weight / Age
परिपक्व अवधि: Lm ? range ? - ? cm
Short description आकृति विज्ञान
Body, 14.7 mm long and up to 1.5 mm high, elongated longitudinally and much flattened laterally, tapering gradually towards both ends; preatrioporal region 10.9 mm, atriopore to anus 1 .0 mm, postanal 1.8mm, and urostyloid process 1.0 mm. Rostral fin extensive and semi-circular, clearly separable from other part by dorsal
and ventral notches. Dorsal fin very low in anterior two-thirds of body, while becoming much higher posterially. Left metapleuron terminated abruptly and markedly just behind atriopore, while the right confluent with well-developed ventral fin, followed by thin and high caudal fin, somewhat higher than dorsal fin. Urostyloid process separable from dorsal and caudal fins by its own lower dorsal and ventral fins. Dorsal fin-chambers 270, relative length to width for posterior tall ones up to 3.3; preanal fin-chambers indiscernible, but instead, an elongated vacuole detected along ventral side of rectum between atriopore and anus. Myotomes 83 in total, consisting of 58 in preatrioporal region, 9 in region from atriopore to anus, and 16 in postanal, thus giving the myotome formula of 58+9+16=83. A black pigment spot detectable in neural tube just anterior to first myotome. Tentacular ring composed of Ca. 30 tentacles (including a few dorsal-most minute ones), its anterior margin situated at level of axial (=proximal) part of 5th myotome; intertentacular membrane extremely higher in span of 6 tentacles next to much shorter midventral tentacle than elsewhere. Mid-gut coecum elongated, ranging at level from 20th to 48th myotomes. No gonad.
Life cycle and mating behavior परिपक्व अवधि | पुनरुत्पत्ति | मछलीऔ का अंडे देना | Eggs | Fecundity | Larvae
Members of the class Cephalochordata are gonochoric. Life cycle: Eggs develop into planktotrophic larva and later on to benthic adults.
Main reference
संदर्भ | संयोजक | सहयोगीयो
Nishikawa, T. 2004. (संदर्भ 766)
IUCN Red List Status
(संदर्भ 130435: Version 2024-2)
CITES status (संदर्भ 108899)
Not Evaluated
CMS (संदर्भ 116361)
Not Evaluated
Threat to humans
Harmless
Human uses
| FishSource |
साधन
अधिक जानकारी
Trophic Ecology
Food items (preys)
संघटक आहार
आहार खपत
परभक्षी
संघटक आहार
आहार खपत
परभक्षी
पारिस्थितिकी
Population dynamics
बाढ़
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversion
बहुतायत
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversion
बहुतायत
Life cycle
Distribution
Physiology
Oxygen consumption
Human Related
Stamps, coins, misc.
Outreach
Taxonomy
संदर्भ
इंटरनेट स्रोत
BHL | BOLD Systems | CISTI | DiscoverLife | FAO(Publication : search) | Fishipedia | GenBank (genome, nucleotide) | GloBI | Gomexsi | Google Books | Google Scholar | Google | PubMed | Tree of Life | Wikipedia (Go, खोज) | Zoological Record
Estimates based on models
Price category
(संदर्भ 80766):
Unknown.