Dallia pectoralis

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Dallia pectoralis
Dallia pectoralis (line art) .jpg

Dallia pectoralis

Systematics
Overcohort : Clupeocephala
Cohort : Euteleosteomorpha
Order : Pike-like (Esociformes)
Family : Esocidae
Genre : Dallia
Type : Dallia pectoralis
Scientific name
Dallia pectoralis
Bean , 1880

Dallia pectoralis is a freshwater fish from the order of the pike-like (Esociformes). He lives in Alaska , the islands of the Bering Sea and at the end of the Chukchi Peninsula in northeastern Siberia .

Distribution area

features

The fish have a short, flat snout and, like the pike, their dorsal and anal fins shifted far back . The gill extensions are short. The lateral line organ has tiny pores. They have 76 to 100 scales along the middle of their body. The pectoral fins are rounded, the pelvic fins are very small and stand far back, just in front of the anus. The caudal fin is broad and rounded.

The fish are 33 centimeters long. They are dark green or brown on top and light on the underside with dark spots. They have four to six irregular dark bands or spots on the flanks. The dorsal, anal and caudal fins have a dark brown border that turns red or pink in spawning animals.

Fin formula : dorsal 10–14, anal 12–16, ventral 3, pectoral 33

Way of life

The fish usually live in heavily overgrown swamps and ponds, and occasionally in medium-sized and large rivers and lakes with abundant vegetation. They migrate from the lower reaches of the river to their spawning grounds in spring and back to deeper waters in autumn. Dallia pectoralis is very cold tolerant and even survives partial freezing. The fish can use their esophagus as an additional breathing organ.

Systematics

Traditionally, the genus Dallia is part of the dogfish family (Umbridae). However, recent phylogenetic studies suggest that Dallia is more closely related to pike ( Esox ) than to umber ; Dallia is therefore the sister species of a taxon from Esox and Novumbra hubbsi , another species that is traditionally part of the Umbridae family. All three genera together are the sister group of Umbra . Wiley and Johnson therefore assigned Dallia to the family Esocidae.

In addition to Dallia pectoralis (the "Alaskan blackfish"), two other species of the genus Dallia have been described, but little researched and perhaps only synonyms for Dallia pectoralis . Both species live in northeastern Siberia.

  • Dallia admirabilis Chereshnev, 1980
  • Dallia delicatissima Smitt, 1881

literature

Individual evidence

  1. ↑ Dallia pectoralis on Fishbase.org (English)
  2. ^ J. Andrés López, Wei-Jen Chen, Guillermo Ortí: Esociform phylogeny. In: Copeia. No. 3, 2004, ISSN  0045-8511 , pp. 449-464, abstract .
  3. ^ Tree of Life Web Project. 2005. Esociformes . Version 01 January 2005 (temporary). in The Tree of Life Web Project .
  4. ^ EO Wiley, G. David Johnson: A teleost classification based on monophyletic groups. In: Joseph S. Nelson, Hans-Peter Schultze , Mark VH Wilson (Eds.): Origin and Phylogenetic Interrelationships of Teleosts. Honoring Gloria Arratia. Dr. Friedrich Pfeil, Munich 2010, ISBN 978-3-89937-107-9 , pp. 123-182.
  5. ↑ Dallia on Fishbase.org (English)

Web links

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