Cephaloscyllium silasi, Indian swellshark

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Cephaloscyllium silasi (Talwar, 1974)

Indian swellshark
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Native range | All suitable habitat | Point map | Year 2050
This map was computer-generated and has not yet been reviewed.
Cephaloscyllium silasi   AquaMaps   Data sources: GBIF OBIS
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Image of Cephaloscyllium silasi (Indian swellshark)
Cephaloscyllium silasi
Picture by Siripittrakul, B. & T. Krajangdara

分類 / Names 俗名 | 同種異名 | Catalog of Fishes(屬, 種) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii 板鰓亞綱 (鯊魚與魟魚) (sharks and rays) > Carcharhiniformes (Ground sharks) 真鯊目 (Ground sharks) > Scyliorhinidae (Cat sharks) 貓鮫科 (Cat sharks) > Scyliorhininae
Etymology: Cephaloscyllium: cephalus, from kephale (Gr.), head, referring to its very broad and depressed head; skylion, Greek for dogfish or small shark. (See ETYFish);  silasi: In honor of Eric Godwin Silas (1928-2018), Sri Lankan-born Indian ichthyologist and fisheries scientist, Director, Central Marine Fisheries Institute (India), “whose excellent publications on the ichthyofauna of the continental shelf of the south-west coast of India have added much to our knowledge of the fauna of this region”. (See ETYFish).

Environment: milieu / climate zone / depth range / distribution range 生態學

海洋 深海底的; 深度上下限 250 - 500 m (Ref. 95495). 深水域; 16°N - 9°N

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Western Indian Ocean: vicinity of Quilon, India (Ref. 244) and Sauqira Bay, Oman (Ref. 10914).
西印度洋: Quilon ，印度 (參考文獻 244) 與 Sauqira 海灣的鄰近區域, 阿曼.(參考文獻 10914)

大小 / 重量 / 年齡

Maturity: Lm ?  range ? - 36.7 cm
Max length : 36.0 cm TL 雄魚/尚未辨別雌雄; (Ref. 95495); 45.0 cm TL (female)

簡短描述 型態特徵 | 形態測量圖

This is a small shark with the following characters: stout body with expanded belly; labial furrows absent but a vestigial lower labial furrow may be present; anterior nasal flaps are broadly triangular; head depressed, flattened and broad, rounded in dorsal and ventrally; mouth large and arched; 5 gill slits, dorsolaterally placed and last two gill slits over pectorals, the 1-3 gill slits are subequal in length, 5th smallest; eyes dorsolateral and slit like; large mouth, arched or crescentic; mouth width 0.6 times HL; first dorsal origin slightly in front of pelvic insertion and placed above pelvics (Ref. 95495).

生物學特性     字彙 (例如 epibenthic)

Found on the uppermost continental slope. Probably a dwarf species. Oviparous (Ref. 50499). This species could possibly attains a maximum size of 50.0 cm TL, with males reported (Ref. 26842) to reach length at maturity at 36.7 cm TL. A 45.0 cm female was found gravid and have two egg cases, one in each uterus, containing visible embryos (85.1-86.2 mm) with attached yolk sac. Stomach examined contains crustaceans and cephalopods (Ref. 95495).

棲息於最上面的大陸斜坡了。 可能一個矮小的種。 卵生的.(參考文獻 50499)

Life cycle and mating behavior 成熟度 | 繁殖 | 產卵場 | 卵 | 孕卵數 | 仔魚

Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449).西印度洋: Quilon ，印度 (參考文獻 244) 與 Sauqira 海灣的鄰近區域, 阿曼.(參考文獻 10914)

主要參考資料 Upload your references | 參考文獻 | 合作者 : Compagno, Leonard J.V. | 合作者

Compagno, L.J.V., 1984. FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Rome: FAO. (Ref. 244)

IUCN 瀕危狀態 (Ref. 130435)

  極危 (CR) (A2d); Date assessed: 19 November 2019

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

對人類具威脅

  無害處的





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Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00263 (0.00139 - 0.00497), b=3.21 (3.04 - 3.38), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
營養階層 (Ref. 69278):  4.0   ±0.5 se; based on size and trophs of closest relatives
回復力 (Ref. 120179):  低的, 最小族群倍增時間4.5 - 14 年 (Fec assumed to be <100).
Fishing Vulnerability (Ref. 59153):  Low to moderate vulnerability (35 of 100).